659 lines
23 KiB
C
659 lines
23 KiB
C
/** STM32F1 application example
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* @file
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @copyright SPDX-License-Identifier: GPL-3.0-or-later
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* @date 2016-2020
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdlib.h> // standard utilities
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#include <string.h> // string utilities
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#include <time.h> // date/time utilities
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#include <ctype.h> // utilities to check chars
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/* STM32 (including CM3) libraries */
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencm3/cm3/nvic.h> // interrupt utilities
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/exti.h> // external interrupt utilities
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#include <libopencm3/stm32/rtc.h> // real time clock utilities
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#include <libopencm3/stm32/iwdg.h> // independent watchdog utilities
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#include <libopencm3/stm32/dbgmcu.h> // debug utilities
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#include <libopencm3/stm32/desig.h> // design utilities
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#include <libopencm3/stm32/flash.h> // flash utilities
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/* own libraries */
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#include "global.h" // board definitions
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#include "print.h" // printing utilities
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#if !defined(STLINKV2)
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#include "uart.h" // USART utilities
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#endif
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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#include "terminal.h" // handle the terminal interface
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#include "menu.h" // menu utilities
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#include "flash_internal.h" // flash utilities
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/** watchdog period in ms */
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#define WATCHDOG_PERIOD 10000
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/** set to 0 if the RTC is reset when the board is powered on, only indicates the uptime
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* set to 1 if VBAT can keep the RTC running when the board is unpowered, indicating the date and time
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*/
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#if defined(CORE_BOARD)
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#define RTC_DATE_TIME 1
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#else
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#define RTC_DATE_TIME 0
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#endif
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/** number of RTC ticks per second
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* @note use integer divider of oscillator to keep second precision
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*/
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#define RTC_TICKS_SECOND 4
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#if defined(RTC_DATE_TIME) && RTC_DATE_TIME
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/** the start time from which to RTC ticks count
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* @note this allows the 32-bit value to reach further in time, particularly when there are several ticks per second
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*/
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const time_t rtc_offset = 1577833200; // We 1. Jan 00:00:00 CET 2020
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#endif
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/** RTC time when device is started */
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static time_t time_start = 0;
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/** @defgroup main_flags flag set in interrupts to be processed in main task
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* @{
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*/
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static volatile bool rtc_internal_tick_flag = false; /**< flag set when internal RTC ticked */
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/** @} */
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size_t putc(char c)
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{
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size_t length = 0; // number of characters printed
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static char last_c = 0; // to remember on which character we last sent
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if ('\n' == c) { // send carriage return (CR) + line feed (LF) newline for each LF
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if ('\r' != last_c) { // CR has not already been sent
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#if !defined(STLINKV2)
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uart_putchar_nonblocking('\r'); // send CR over USART
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#endif
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usb_cdcacm_putchar('\r'); // send CR over USB
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length++; // remember we printed 1 character
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}
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}
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#if !defined(STLINKV2)
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uart_putchar_nonblocking(c); // send byte over USART
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#endif
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usb_cdcacm_putchar(c); // send byte over USB
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length++; // remember we printed 1 character
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last_c = c; // remember last character
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return length; // return number of characters printed
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}
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/** display available commands
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* @param[in] argument no argument required
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*/
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static void command_help(void* argument);
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/** show software and hardware version
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* @param[in] argument no argument required
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*/
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static void command_version(void* argument);
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/** show uptime
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* @param[in] argument no argument required
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*/
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static void command_uptime(void* argument);
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#if RTC_DATE_TIME
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/** show date and time
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* @param[in] argument date and time to set
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*/
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static void command_datetime(void* argument);
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#endif
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/** reset board
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* @param[in] argument no argument required
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*/
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static void command_reset(void* argument);
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/** switch to DFU bootloader
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* @param[in] argument no argument required
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*/
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static void command_bootloader(void* argument);
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/** list of all supported commands */
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static const struct menu_command_t menu_commands[] = {
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{
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.shortcut = 'h',
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.name = "help",
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.command_description = "display help",
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.argument = MENU_ARGUMENT_NONE,
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.argument_description = NULL,
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.command_handler = &command_help,
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},
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{
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.shortcut = 'v',
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.name = "version",
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.command_description = "show software and hardware version",
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.argument = MENU_ARGUMENT_NONE,
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.argument_description = NULL,
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.command_handler = &command_version,
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},
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{
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.shortcut = 'u',
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.name = "uptime",
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.command_description = "show uptime",
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.argument = MENU_ARGUMENT_NONE,
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.argument_description = NULL,
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.command_handler = &command_uptime,
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},
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#if RTC_DATE_TIME
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{
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.shortcut = 'd',
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.name = "date",
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.command_description = "show/set date and time",
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.argument = MENU_ARGUMENT_STRING,
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.argument_description = "[YYYY-MM-DD HH:MM:SS]",
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.command_handler = &command_datetime,
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},
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#endif
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{
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.shortcut = 'r',
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.name = "reset",
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.command_description = "reset board",
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.argument = MENU_ARGUMENT_NONE,
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.argument_description = NULL,
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.command_handler = &command_reset,
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},
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{
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.shortcut = 'b',
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.name = "bootloader",
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.command_description = "reboot into DFU bootloader",
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.argument = MENU_ARGUMENT_NONE,
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.argument_description = NULL,
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.command_handler = &command_bootloader,
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},
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};
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static void command_help(void* argument)
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{
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(void)argument; // we won't use the argument
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printf("available commands:\n");
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menu_print_commands(menu_commands, LENGTH(menu_commands)); // print global commands
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}
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static void command_version(void* argument)
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{
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(void)argument; // we won't use the argument
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printf("firmware date: %04u-%02u-%02u\n", BUILD_YEAR, BUILD_MONTH, BUILD_DAY); // show firmware build date
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// show flash size
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puts("MCU advertised flash size: ");
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if (0xffff == DESIG_FLASH_SIZE) {
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puts("unknown (probably a counterfeit/defective micro-controller\n");
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} else {
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printf("%u KB\n", DESIG_FLASH_SIZE);
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}
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if ((uint32_t)&__flash_end >= FLASH_BASE) {
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printf("linker advertised flash size: %u KB\n", ((uint32_t)&__flash_end - FLASH_BASE) / 1024);
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}
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uint32_t flash_size = flash_internal_probe_read_size();
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printf("readable flash size: %u bytes (%u KB)\n", flash_size, flash_size / 1024);
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flash_size = flash_internal_probe_write_size();
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printf("writable flash size: %u bytes (%u KB)\n", flash_size, flash_size / 1024);
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const uint16_t dev_id = DBGMCU_IDCODE & DBGMCU_IDCODE_DEV_ID_MASK;
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const uint16_t rev_id = DBGMCU_IDCODE >> 16;
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char* unreadable;
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if (0 == DBGMCU_IDCODE && 0 == (SCS_DHCSR & SCS_DHCSR_C_DEBUGEN)) {
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unreadable = " (not readable, retry with debug attached)";
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} else if (0x307 == DBGMCU_IDCODE && (SCS_DHCSR & SCS_DHCSR_C_DEBUGEN)) {
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unreadable = " (erroneous reading, read over debug first)";
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} else {
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unreadable = "";
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}
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printf("MCU id code: %+08x (DEV_ID=0x%03x REV_ID=0x%04x)%s\n", DBGMCU_IDCODE, dev_id, rev_id, unreadable); // see below for details
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printf("device id: %08x%08x%04x%04x\n", DESIG_UNIQUE_ID2, DESIG_UNIQUE_ID1, DESIG_UNIQUE_ID0 & 0xffff, DESIG_UNIQUE_ID0 >> 16); // not that the half-works are reversed in the first word
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//printf("SCS_DHCSR: %+08x, DEBUGEN: %u\n", SCS_DHCSR, SCS_DHCSR & SCS_DHCSR_C_DEBUGEN);
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// SCS_DHCSR: 0x03010000, DEBUGEN: 0 debug not attached
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// SCS_DHCSR: 0x01010001, DEBUGEN: 1 debug attached
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#if DEBUG
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bool fake = false; // if details indicate it's not an STM32
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puts("chip family: ");
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switch (dev_id) {
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case 0: // DBGMCU_IDCODE is only accessible in debug mode (this is a known issue documented in STM32F10xx8/B and STM32F10xxC/D/E Errata sheet, without workaround) (CKS32F103 is not affected by this issue)
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puts("not readable, retry with debug attached");
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break;
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// from RM0008 STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and STM32F107xx
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case 0x307: // this is completely undocumented (even in the errata), but even with debug attached, DBGMCU_IDCODE = 0x00000307, until the DBGMCU_IDCODE is read over SWJ, only then it's correct. but the JEP106 ID part number is always right (with same meaning). this has been seen on a genuine STM32F103C8T6 (AFAICS)
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puts("erroneous reading, read over debug first");
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break;
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case 0x412:
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puts("STM32F10x low-density");
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break;
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case 0x410:
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puts("STM32F10x medium-density");
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break;
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case 0x414:
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puts("STM32F10x high-density");
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break;
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case 0x430:
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puts("STM32F10x XL-density");
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break;
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case 0x418:
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puts("STM32F10x connectivity");
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break;
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// from RM0091 STM32F0x8
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case 0x444:
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puts("STM32F03x");
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break;
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case 0x445:
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puts("STM32F04x");
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break;
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case 0x440:
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puts("STM32F05x");
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break;
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case 0x448:
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puts("STM32F07x");
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break;
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case 0x442:
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puts("STM32F09x");
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break;
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// from RM0444 STM32G0x1
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case 0x460:
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puts("STM32G071xx/STM32G081xx");
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break;
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case 0x466:
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puts("STM32G031xx/STM32G041xx");
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break;
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// from RM0090 STM32F4x5/STM32F4x7
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case 0x413:
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puts("STM32F405/STM32F407/STM32F415/STM32F417");
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break;
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case 0x419:
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puts("STM32F42x/STM32F43x");
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break;
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// from RM0368
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case 0x423:
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puts("STM32F401xB/C");
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break;
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case 0x433:
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puts("STM32F401xD/E");
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break;
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// from RM0383
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case 0x431:
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puts("STM32F411xC/E");
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break;
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default:
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puts("unknown");
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fake = true;
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break;
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}
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putc('\n');
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puts("chip revision: ");
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switch (DBGMCU_IDCODE & DBGMCU_IDCODE_DEV_ID_MASK) {
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case 0x412:
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if (0x1000 == rev_id) {
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putc('A');
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} else {
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puts("unknown");
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}
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break;
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case 0x410:
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if (0x0000 == rev_id) {
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putc('A');
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} else if (0x2000 == rev_id) {
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putc('B');
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} else if (0x2001 == rev_id) {
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putc('Z');
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} else if (0x2003 == rev_id) {
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puts("1/2/3/X/Y");
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} else {
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puts("unknown");
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}
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break;
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case 0x414:
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if (0x1000 == rev_id) {
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puts("A/1");
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} else if (0x1001 == rev_id) {
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putc('Z');
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} else if (0x1003 == rev_id) {
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puts("1/2/3/X/Y");
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} else {
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puts("unknown");
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}
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break;
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case 0x430:
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if (0x1003 == rev_id) {
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puts("A/1");
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} else {
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puts("unknown");
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}
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break;
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case 0x418:
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if (0x1000 == rev_id) {
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putc('A');
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} else if (0x1001 == rev_id) {
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putc('Z');
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} else {
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puts("unknown");
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}
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break;
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default:
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printf("unknown");
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break;
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}
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putc('\n');
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// from RM0091 STM32F0x8 reference manual (not sure if it applies to F1)
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puts("manufacturing information (STM32F0x8 schema):\n");
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printf("- X,Y wafer coordinate: %08x\n", DESIG_UNIQUE_ID0);
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printf("- lot number: %c%c%c%c%c%c%c\n", DESIG_UNIQUE_ID2 >> 24, DESIG_UNIQUE_ID2 >> 16, DESIG_UNIQUE_ID2 >> 8, DESIG_UNIQUE_ID2 >> 0, DESIG_UNIQUE_ID1 >> 24, DESIG_UNIQUE_ID1 >> 16, DESIG_UNIQUE_ID1 >> 8);
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printf("- wafer number: %u\n", DESIG_UNIQUE_ID1 & 0xff);
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// from ARMv7-M and Cortex-M3 TRM
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// ARMv7-M B3.2.3
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printf("CPUID: 0x%08x\n", SCB_CPUID);
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const uint8_t cpuid_implementer = (SCB_CPUID & SCB_CPUID_IMPLEMENTER) >> SCB_CPUID_IMPLEMENTER_LSB;
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printf("- implementer: %s (0x%02x)\n", 0x41 == cpuid_implementer ? "ARM" : "unknown", cpuid_implementer);
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const uint8_t cpuid_architecture = (SCB_CPUID & SCB_CPUID_CONSTANT) >> SCB_CPUID_CONSTANT_LSB;
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puts("- architecture: ");
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switch (cpuid_architecture) {
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case 0xc:
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puts("ARMv6-M");
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break;
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case 0xf:
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puts("ARMv7-M");
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break;
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default:
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fake = true;
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puts("unknown");
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}
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printf(" (0x%x)\n", cpuid_architecture);
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const uint16_t cpuid_partno = (SCB_CPUID & SCB_CPUID_PARTNO) >> SCB_CPUID_PARTNO_LSB;
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puts("- part number: ");
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switch (cpuid_partno) {
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case 0xC60:
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puts("Cortex-M0+");
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break;
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case 0xC20:
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puts("Cortex-M0");
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break;
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case 0xC23: // the ARM spec actually mentions 0xC24
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puts("Cortex-M3");
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break;
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case 0xC24:
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puts("Cortex-M4");
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break;
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case 0xC27:
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puts("Cortex-M7");
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break;
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default:
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fake = true;
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puts("unknown");
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}
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printf(" (0x%03x)\n", cpuid_partno);
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const uint8_t cpuid_variant = (SCB_CPUID & SCB_CPUID_VARIANT) >> SCB_CPUID_VARIANT_LSB;
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printf("- variant: %u\n", cpuid_variant);
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const uint8_t cpuid_revision = (SCB_CPUID & SCB_CPUID_REVISION) >> SCB_CPUID_REVISION_LSB;
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printf("- revision: %u\n", cpuid_revision);
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// ARM CoreSight B2.2.2
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const uint8_t jep106_continuation = *(uint32_t*)0xE00FFFD0 & 0x0f; // DES_2, PIDR4 bits[3:0]
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const uint8_t jep106_identification = ((*(uint32_t*)0xE00FFFE8 & 0x7) << 4) + ((*(uint32_t*)0xE00FFFE4 >> 4) & 0xf); // DES_0, PIDR1 bits[7:4] JEP106 identification code bits[3:0], DES_1, PIDR2 bits[2:0] JEP106 identification code bits[6:4]
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const uint16_t pidr_partno = ((*(uint32_t*)0xE00FFFE4 & 0xf) << 8) + (*(uint32_t*)0xE00FFFE0 & 0xff); // PART_0, PIDR0 bits[7:0] Part number bits[7:0], PART_1, PIDR1 bits[3:0] Part number bits[11:8]
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puts("JEP106 ID: ");
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if (0 == jep106_continuation && 0x20 == jep106_identification) {
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puts("STM");
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} else if (7 == jep106_continuation && 0x51 == jep106_identification) {
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puts("GigaDevice");
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} else if (4 == jep106_continuation && 0x3b == jep106_identification) {
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puts("ARM");
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} else {
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puts("unknown");
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}
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printf(" (cont.=%u, ID=0x%02x), part=0x%03x\n", jep106_continuation, jep106_identification, pidr_partno);
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// guess the micro-controller
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char* mcu = "STM32"; // which MCU is identified
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puts("MCU: ");
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if (1 == cpuid_variant && 1 == cpuid_revision && 0 == jep106_continuation && 0x20 == jep106_identification) { // STM32 uses Cortex-M3 r1p1 and the right JEP106 ID
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mcu = "STM32";
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} else if (2 == cpuid_variant && 1 == cpuid_revision && 7 == jep106_continuation && 0x51 == jep106_identification) { // GD32 uses Cortex-M3 r2p1 and the right JEP106 ID
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mcu = "GD32";
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fake = true;
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} else if (2 == cpuid_variant && 1 == cpuid_revision && 4 == jep106_continuation && 0x3b == jep106_identification) { // GD32 uses Cortex-M3 r2p1 and ARM JEP106 ID
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mcu = "CKS32";
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fake = true;
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} else {
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mcu = "unknown";
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fake = true;
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}
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puts(mcu);
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putc('\n');
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// detect fake STM32
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if (0x412 == dev_id || 0x410 == dev_id || 0x414 == dev_id || 0x430 == dev_id || 0x418 == dev_id) { // STM32F10x
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// STM32F10x uses a Cortex-M3 r1p1
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if (0xC23 != cpuid_partno) { // Cortex-M3
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fake = true;
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}
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if (1 != cpuid_variant) { // r1
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fake = true;
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}
|
|
if (1 != cpuid_revision) { // p1
|
|
fake = true;
|
|
}
|
|
}
|
|
if (0 != DBGMCU_IDCODE && 0 == (SCS_DHCSR & SCS_DHCSR_C_DEBUGEN)) { // STM32 can't read the MCU ID without debug attached (see errata). CKS32 is not affected by this issue
|
|
fake = true;
|
|
}
|
|
if (0 == strcmp(mcu, "STM32")) {
|
|
printf("this %s to be a genuine STM32\n", fake ? "does not seem" : "seems");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void command_uptime(void* argument)
|
|
{
|
|
(void)argument; // we won't use the argument
|
|
const uint32_t uptime = (rtc_get_counter_val() - time_start) / RTC_TICKS_SECOND; // get time from internal RTC
|
|
printf("uptime: %u.%02u:%02u:%02u\n", uptime / (24 * 60 * 60), (uptime / (60 * 60)) % 24, (uptime / 60) % 60, uptime % 60);
|
|
}
|
|
|
|
#if RTC_DATE_TIME
|
|
static void command_datetime(void* argument)
|
|
{
|
|
char* datetime = (char*)argument; // argument is optional date time
|
|
if (NULL == argument) { // no date and time provided, just show the current day and time
|
|
const time_t time_rtc = rtc_get_counter_val() / RTC_TICKS_SECOND + rtc_offset; // get time from internal RTC
|
|
const struct tm* time_tm = localtime(&time_rtc); // convert time
|
|
const char* days[] = { "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"}; // the days of the week
|
|
printf("date: %s %d-%02d-%02d %02d:%02d:%02d\n", days[time_tm->tm_wday], 1900 + time_tm->tm_year, 1 + time_tm->tm_mon, time_tm->tm_mday, time_tm->tm_hour, time_tm->tm_min, time_tm->tm_sec);
|
|
} else { // date and time provided, set it
|
|
const char* malformed = "date and time malformed, expecting YYYY-MM-DD HH:MM:SS\n";
|
|
struct tm time_tm; // to store the parsed date time
|
|
if (strlen(datetime) != (4 + 1 + 2 + 1 + 2) + 1 + (2 + 1 + 2 + 1 + 2)) { // verify date/time is long enough
|
|
printf(malformed);
|
|
return;
|
|
}
|
|
if (!(isdigit((int8_t)datetime[0]) && isdigit((int8_t)datetime[1]) && isdigit((int8_t)datetime[2]) && isdigit((int8_t)datetime[3]) && '-' == datetime[4] && isdigit((int8_t)datetime[5]) && isdigit((int8_t)datetime[6]) && '-' == datetime[7] && isdigit((int8_t)datetime[8]) && isdigit((int8_t)datetime[9]) && ' ' == datetime[10] && isdigit((int8_t)datetime[11]) && isdigit((int8_t)datetime[12]) && ':' == datetime[13] && isdigit((int8_t)datetime[14]) && isdigit((int8_t)datetime[15]) && ':' == datetime[16] && isdigit((int8_t)datetime[17]) && isdigit((int8_t)datetime[18]))) { // verify format (good enough to not fail parsing)
|
|
printf(malformed);
|
|
return;
|
|
}
|
|
time_tm.tm_year = strtol(&datetime[0], NULL, 10) - 1900; // parse year
|
|
time_tm.tm_mon = strtol(&datetime[5], NULL, 10) - 1; // parse month
|
|
time_tm.tm_mday = strtol(&datetime[8], NULL, 10); // parse day
|
|
time_tm.tm_hour = strtol(&datetime[11], NULL, 10); // parse hour
|
|
time_tm.tm_min = strtol(&datetime[14], NULL, 10); // parse minutes
|
|
time_tm.tm_sec = strtol(&datetime[17], NULL, 10); // parse seconds
|
|
time_t time_rtc = mktime(&time_tm); // get back seconds
|
|
time_rtc -= rtc_offset; // remove start offset
|
|
time_start = time_rtc * RTC_TICKS_SECOND + (rtc_get_counter_val() - time_start); // update uptime with current date
|
|
rtc_set_counter_val(time_rtc * RTC_TICKS_SECOND); // save date/time to internal RTC
|
|
printf("date and time saved: %d-%02d-%02d %02d:%02d:%02d\n", 1900 + time_tm.tm_year, 1 + time_tm.tm_mon, time_tm.tm_mday, time_tm.tm_hour, time_tm.tm_min, time_tm.tm_sec);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void command_reset(void* argument)
|
|
{
|
|
(void)argument; // we won't use the argument
|
|
scb_reset_system(); // reset device
|
|
while (true); // wait for the reset to happen
|
|
}
|
|
|
|
static void command_bootloader(void* argument)
|
|
{
|
|
(void)argument; // we won't use the argument
|
|
// set DFU magic to specific RAM location
|
|
__dfu_magic[0] = 'D';
|
|
__dfu_magic[1] = 'F';
|
|
__dfu_magic[2] = 'U';
|
|
__dfu_magic[3] = '!';
|
|
scb_reset_system(); // reset system (core and peripherals)
|
|
while (true); // wait for the reset to happen
|
|
}
|
|
|
|
/** process user command
|
|
* @param[in] str user command string (\0 ended)
|
|
*/
|
|
static void process_command(char* str)
|
|
{
|
|
// ensure actions are available
|
|
if (NULL == menu_commands || 0 == LENGTH(menu_commands)) {
|
|
return;
|
|
}
|
|
// don't handle empty lines
|
|
if (!str || 0 == strlen(str)) {
|
|
return;
|
|
}
|
|
bool command_handled = false;
|
|
if (!command_handled) {
|
|
command_handled = menu_handle_command(str, menu_commands, LENGTH(menu_commands)); // try if this is not a global command
|
|
}
|
|
if (!command_handled) {
|
|
printf("command not recognized. enter help to list commands\n");
|
|
}
|
|
}
|
|
|
|
/** program entry point
|
|
* this is the firmware function started by the micro-controller
|
|
*/
|
|
void main(void);
|
|
void main(void)
|
|
{
|
|
rcc_clock_setup_in_hse_8mhz_out_72mhz(); // use 8 MHz high speed external clock to generate 72 MHz internal clock
|
|
|
|
#if DEBUG
|
|
// enable functionalities for easier debug
|
|
DBGMCU_CR |= DBGMCU_CR_IWDG_STOP; // stop independent watchdog counter when code is halted
|
|
DBGMCU_CR |= DBGMCU_CR_WWDG_STOP; // stop window watchdog counter when code is halted
|
|
DBGMCU_CR |= DBGMCU_CR_STANDBY; // allow debug also in standby mode (keep digital part and clock powered)
|
|
DBGMCU_CR |= DBGMCU_CR_STOP; // allow debug also in stop mode (keep clock powered)
|
|
DBGMCU_CR |= DBGMCU_CR_SLEEP; // allow debug also in sleep mode (keep clock powered)
|
|
#else
|
|
// setup watchdog to reset in case we get stuck (i.e. when an error occurred)
|
|
iwdg_set_period_ms(WATCHDOG_PERIOD); // set independent watchdog period
|
|
iwdg_start(); // start independent watchdog
|
|
#endif
|
|
|
|
board_setup(); // setup board
|
|
#if !defined(STLINKV2)
|
|
uart_setup(); // setup USART (for printing)
|
|
#endif
|
|
usb_cdcacm_setup(); // setup USB CDC ACM (for printing)
|
|
puts("\nwelcome to the CuVoodoo STM32F1 example application\n"); // print welcome message
|
|
|
|
#if DEBUG
|
|
// show reset cause
|
|
if (RCC_CSR & (RCC_CSR_LPWRRSTF | RCC_CSR_WWDGRSTF | RCC_CSR_IWDGRSTF | RCC_CSR_SFTRSTF | RCC_CSR_PORRSTF | RCC_CSR_PINRSTF)) {
|
|
puts("reset cause(s):");
|
|
if (RCC_CSR & RCC_CSR_LPWRRSTF) {
|
|
puts(" low-power");
|
|
}
|
|
if (RCC_CSR & RCC_CSR_WWDGRSTF) {
|
|
puts(" window-watchdog");
|
|
}
|
|
if (RCC_CSR & RCC_CSR_IWDGRSTF) {
|
|
puts(" independent-watchdog");
|
|
}
|
|
if (RCC_CSR & RCC_CSR_SFTRSTF) {
|
|
puts(" software");
|
|
}
|
|
if (RCC_CSR & RCC_CSR_PORRSTF) {
|
|
puts(" POR/PDR");
|
|
}
|
|
if (RCC_CSR & RCC_CSR_PINRSTF) {
|
|
puts(" pin");
|
|
}
|
|
putc('\n');
|
|
RCC_CSR |= RCC_CSR_RMVF; // clear reset flags
|
|
}
|
|
#endif
|
|
#if !(DEBUG)
|
|
// show watchdog information
|
|
printf("setup watchdog: %.2fs", WATCHDOG_PERIOD / 1000.0);
|
|
if (FLASH_OBR & FLASH_OBR_OPTERR) {
|
|
puts(" (option bytes not set in flash: software wachtdog used, not automatically started at reset)\n");
|
|
} else if (FLASH_OBR & FLASH_OBR_WDG_SW) {
|
|
puts(" (software watchdog used, not automatically started at reset)\n");
|
|
} else {
|
|
puts(" (hardware watchdog used, automatically started at reset)\n");
|
|
}
|
|
#endif
|
|
|
|
// setup RTC
|
|
puts("setup internal RTC: ");
|
|
#if defined(BLUE_PILL) || defined(STLINKV2) || defined(BLASTER) // for boards without a Low Speed External oscillator
|
|
// note: the blue pill LSE oscillator is affected when toggling the onboard LED, thus prefer the HSE
|
|
rtc_auto_awake(RCC_HSE, 8000000 / 128 / RTC_TICKS_SECOND - 1); // use High Speed External oscillator (8 MHz / 128) as RTC clock (VBAT can't be used to keep the RTC running)
|
|
#else // for boards with an precise Low Speed External oscillator
|
|
rtc_auto_awake(RCC_LSE, 32768 / RTC_TICKS_SECOND - 1); // ensure internal RTC is on, uses the 32.678 kHz LSE, and the prescale is set to our tick speed, else update backup registers accordingly (power off the micro-controller for the change to take effect)
|
|
#endif
|
|
rtc_interrupt_enable(RTC_SEC); // enable RTC interrupt on "seconds"
|
|
nvic_enable_irq(NVIC_RTC_IRQ); // allow the RTC to interrupt
|
|
time_start = rtc_get_counter_val(); // get start time from internal RTC
|
|
puts("OK\n");
|
|
|
|
// setup terminal
|
|
terminal_prefix = ""; // set default prefix
|
|
terminal_process = &process_command; // set central function to process commands
|
|
terminal_setup(); // start terminal
|
|
|
|
// start main loop
|
|
bool action = false; // if an action has been performed don't go to sleep
|
|
button_flag = false; // reset button flag
|
|
while (true) { // infinite loop
|
|
iwdg_reset(); // kick the dog
|
|
if (user_input_available) { // user input is available
|
|
action = true; // action has been performed
|
|
led_toggle(); // toggle LED
|
|
char c = user_input_get(); // store receive character
|
|
terminal_send(c); // send received character to terminal
|
|
}
|
|
if (button_flag) { // user pressed button
|
|
action = true; // action has been performed
|
|
puts("button pressed\n");
|
|
led_toggle(); // toggle LED
|
|
sleep_ms(100); // wait a bit to remove noise and double trigger
|
|
button_flag = false; // reset flag
|
|
}
|
|
if (rtc_internal_tick_flag) { // the internal RTC ticked
|
|
rtc_internal_tick_flag = false; // reset flag
|
|
action = true; // action has been performed
|
|
if (0 == (rtc_get_counter_val() % RTC_TICKS_SECOND)) { // one seond has passed
|
|
led_toggle(); // toggle LED (good to indicate if main function is stuck)
|
|
}
|
|
}
|
|
if (action) { // go to sleep if nothing had to be done, else recheck for activity
|
|
action = false;
|
|
} else {
|
|
__WFI(); // go to sleep
|
|
}
|
|
} // main loop
|
|
}
|
|
|
|
/** @brief interrupt service routine called when tick passed on RTC */
|
|
void rtc_isr(void)
|
|
{
|
|
rtc_clear_flag(RTC_SEC); // clear flag
|
|
rtc_internal_tick_flag = true; // notify to show new time
|
|
}
|