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328 lines
11 KiB
328 lines
11 KiB
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** STM32F1 application example
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* @file application.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016-2018
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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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/* 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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#include "uart.h" // USART utilities
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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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#define WATCHDOG_PERIOD 10000 /**< watchdog period in ms */
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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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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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uart_putchar_nonblocking('\r'); // send CR over USART
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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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uart_putchar_nonblocking(c); // send byte over USART
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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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/** 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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{
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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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// get device identifier (DEV_ID)
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// 0x412: low-density, 16-32 kB flash
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// 0x410: medium-density, 64-128 kB flash
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// 0x414: high-density, 256-512 kB flash
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// 0x430: XL-density, 768-1024 kB flash
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// 0x418: connectivity
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printf("device family: ");
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switch (DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK) {
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case 0: // this is a known issue document in STM32F10xxC/D/E Errata sheet, without workaround
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printf("unreadable\n");
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break;
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case 0x412:
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printf("low-density\n");
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break;
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case 0x410:
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printf("medium-density\n");
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break;
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case 0x414:
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printf("high-density\n");
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break;
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case 0x430:
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printf("XL-density\n");
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break;
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case 0x418:
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printf("connectivity\n");
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break;
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default:
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printf("unknown\n");
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break;
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}
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// show flash size
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printf("flash size: ");
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if (0xffff==DESIG_FLASH_SIZE) {
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printf("unknown (probably a 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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// display device identity
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printf("device id: %08x%08x%08x\n", DESIG_UNIQUE_ID0, DESIG_UNIQUE_ID1, DESIG_UNIQUE_ID2);
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}
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static void command_uptime(void* argument)
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{
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(void)argument; // we won't use the argument
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uint32_t uptime = rtc_get_counter_val(); // get time from internal RTC
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printf("uptime: %u.%02u:%02u:%02u\n", uptime/(24*60*60), (uptime/(60*60))%24, (uptime/60)%60, uptime%60);
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}
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static void command_reset(void* argument)
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{
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(void)argument; // we won't use the argument
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scb_reset_system(); // reset device
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while (true); // wait for the reset to happen
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}
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static void command_bootloader(void* argument)
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{
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(void)argument; // we won't use the argument
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RCC_CSR |= RCC_CSR_RMVF; // clear reset flags
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scb_reset_core(); // reset core (the bootloader will interpret it as starting into DFU)
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while (true); // wait for the reset to happen
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}
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/** process user command
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* @param[in] str user command string (\0 ended)
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*/
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static void process_command(char* str)
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{
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// ensure actions are available
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if (NULL==menu_commands || 0==LENGTH(menu_commands)) {
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return;
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}
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// don't handle empty lines
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if (!str || 0==strlen(str)) {
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return;
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}
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bool command_handled = false;
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if (!command_handled) {
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command_handled = menu_handle_command(str, menu_commands, LENGTH(menu_commands)); // try if this is not a global command
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}
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if (!command_handled) {
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printf("command not recognized. enter help to list commands\n");
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}
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}
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/** program entry point
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* this is the firmware function started by the micro-controller
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*/
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void main(void);
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void main(void)
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{
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rcc_clock_setup_in_hse_8mhz_out_72mhz(); // use 8 MHz high speed external clock to generate 72 MHz internal clock
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#if DEBUG
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// enable functionalities for easier debug
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DBGMCU_CR |= DBGMCU_CR_IWDG_STOP; // stop independent watchdog counter when code is halted
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DBGMCU_CR |= DBGMCU_CR_WWDG_STOP; // stop window watchdog counter when code is halted
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DBGMCU_CR |= DBGMCU_CR_STANDBY; // allow debug also in standby mode (keep digital part and clock powered)
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DBGMCU_CR |= DBGMCU_CR_STOP; // allow debug also in stop mode (keep clock powered)
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DBGMCU_CR |= DBGMCU_CR_SLEEP; // allow debug also in sleep mode (keep clock powered)
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#else
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// setup watchdog to reset in case we get stuck (i.e. when an error occurred)
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iwdg_set_period_ms(WATCHDOG_PERIOD); // set independent watchdog period
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iwdg_start(); // start independent watchdog
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#endif
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board_setup(); // setup board
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uart_setup(); // setup USART (for printing)
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usb_cdcacm_setup(); // setup USB CDC ACM (for printing)
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printf("\nwelcome to the CuVoodoo STM32F1 example application\n"); // print welcome message
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#if !(DEBUG)
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// show watchdog information
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printf("setup watchdog: %.2fs",WATCHDOG_PERIOD/1000.0);
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if (FLASH_OBR&FLASH_OBR_OPTERR) {
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printf(" (option bytes not set in flash: software wachtdog used, not automatically started at reset)\n");
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} else if (FLASH_OBR&FLASH_OBR_WDG_SW) {
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printf(" (software wachtdog used, not automatically started at reset)\n");
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} else {
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printf(" (hardware wachtdog used, automatically started at reset)\n");
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}
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#endif
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// setup RTC
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printf("setup internal RTC: ");
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rtc_auto_awake(RCC_LSE, 32768-1); // 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)
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rtc_interrupt_enable(RTC_SEC); // enable RTC interrupt on "seconds"
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nvic_enable_irq(NVIC_RTC_IRQ); // allow the RTC to interrupt
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printf("OK\n");
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// setup terminal
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terminal_prefix = ""; // set default prefix
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terminal_process = &process_command; // set central function to process commands
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terminal_setup(); // start terminal
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// start main loop
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bool action = false; // if an action has been performed don't go to sleep
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button_flag = false; // reset button flag
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while (true) { // infinite loop
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iwdg_reset(); // kick the dog
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while (user_input_available) { // user input is available
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action = true; // action has been performed
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led_toggle(); // toggle LED
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char c = user_input_get(); // store receive character
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terminal_send(c); // send received character to terminal
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}
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while (button_flag) { // user pressed button
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action = true; // action has been performed
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printf("button pressed\n");
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led_toggle(); // toggle LED
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for (uint32_t i=0; i<1000000; i++) { // wait a bit to remove noise and double trigger
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__asm__("nop");
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}
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button_flag = false; // reset flag
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}
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while (rtc_internal_tick_flag) { // the internal RTC ticked
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rtc_internal_tick_flag = false; // reset flag
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action = true; // action has been performed
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#if !defined(BLUE_PILL) // on the blue pill the LED is close to the 32.768 kHz oscillator and heavily influences it
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led_toggle(); // toggle LED (good to indicate if main function is stuck)
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#endif
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}
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if (action) { // go to sleep if nothing had to be done, else recheck for activity
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action = false;
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} else {
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__WFI(); // go to sleep
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}
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} // main loop
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}
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/** @brief interrupt service routine called when tick passed on RTC */
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void rtc_isr(void)
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{
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rtc_clear_flag(RTC_SEC); // clear flag
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rtc_internal_tick_flag = true; // notify to show new time
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}
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