282 lines
10 KiB
C
282 lines
10 KiB
C
/* 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 example
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* @file main.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016
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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 <stdio.h> // standard I/O facilities
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#include <stdlib.h> // standard utilities
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#include <unistd.h> // standard streams
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#include <errno.h> // error number utilities
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#include <string.h> // string utilities
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#include <math.h> // mathematical utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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#include <libopencm3/cm3/nvic.h> // interrupt utilities
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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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/* own libraries */
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#include "global.h" // board definitions
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#include "usart.h" // USART utilities
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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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 button_flag = false; /**< flag set when board user button has been pressed/released */
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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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/** user input command */
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char command[32] = {0};
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/** user input command index */
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uint8_t command_i = 0;
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int _write(int file, char *ptr, int len)
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{
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int i; // how much data has been sent
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static char newline = 0; // what newline has been sent
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if (file == STDOUT_FILENO || file == STDERR_FILENO) {
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for (i = 0; i < len; i++) {
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if (ptr[i] == '\r' || ptr[i] == '\n') { // send CR+LF newline for most carriage return and line feed combination
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if (newline==0 || (newline==ptr[i])) { // newline has already been detected
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usart_putchar_nonblocking('\r'); // send newline over USART
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usart_putchar_nonblocking('\n'); // send newline over USART
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cdcacm_putchar('\r'); // send newline over USB
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cdcacm_putchar('\n'); // send newline over USB
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newline = ptr[i]; // remember the newline
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}
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if (ptr[i] == '\n') { // line feed are always considered to end a line (the LF+CR combination is not supported to better support the others)
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newline = 0; // clear new line
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}
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} else { // non-newline character
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usart_putchar_nonblocking(ptr[i]); // send byte over USART
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cdcacm_putchar(ptr[i]); // send byte over USB
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newline = 0; // clear new line
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}
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}
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return i;
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}
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errno = EIO;
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return -1;
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}
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char* b2s(uint64_t binary, uint8_t rjust)
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{
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static char string[64+1] = {0}; // the string representation to return
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int8_t bit = LENGTH(string)-1; // the index of the bit to print
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string[bit--] = 0; // terminate string
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while (binary) {
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if (binary & 1) {
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string[bit--] = '1';
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} else {
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string[bit--] = '0';
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}
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binary >>= 1;
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}
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while (64-bit-1<rjust && bit>=0) {
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string[bit--] = '0';
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}
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return &string[bit+1];
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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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// split command
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const char* delimiter = " ";
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char* word = strtok(str,delimiter);
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if (!word) {
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goto error;
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}
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// parse command
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if (0==strcmp(word,"help")) {
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printf("available commands:\n");
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printf("led [on|off|toggle]\n");
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printf("time [HH:MM:SS]\n");
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} else if (0==strcmp(word,"led")) {
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word = strtok(NULL,delimiter);
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if (!word) {
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goto error;
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} else if (0==strcmp(word,"on")) {
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led_on(); // switch LED on
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printf("LED switched on\n"); // notify user
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} else if (0==strcmp(word,"off")) {
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led_off(); // switch LED off
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printf("LED switched off\n"); // notify user
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} else if (0==strcmp(word,"toggle")) {
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led_toggle(); // toggle LED
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printf("LED toggled\n"); // notify user
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} else {
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goto error;
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}
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} else if (0==strcmp(word,"time")) {
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word = strtok(NULL,delimiter);
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if (!word) {
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printf("current time: %02lu:%02lu:%02lu\n", rtc_get_counter_val()/(60*60), (rtc_get_counter_val()%(60*60))/60, (rtc_get_counter_val()%60)); // get and print time from internal RTC
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} else if (strlen(word)!=8 || word[0]<'0' || word[0]>'2' || word[1]<'0' || word[1]>'9' || word[3]<'0' || word[3]>'5' || word[4]<'0' || word[4]>'9' || word[6]<'0' || word[6]>'5' || word[7]<'0' || word[7]>'9') { // time format is incorrect
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goto error;
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} else {
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rtc_set_counter_val(((word[0]-'0')*10+(word[1]-'0')*1)*(60*60)+((word[3]-'0')*10+(word[4]-'0')*1)*60+((word[6]-'0')*10+(word[7]-'0')*1)); // set time in internal RTC counter
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printf("time set\n");
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}
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} else {
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goto error;
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}
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return; // command successfully processed
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error:
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printf("command not recognized. enter help to list commands\n");
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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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int 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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// setup LED
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rcc_periph_clock_enable(LED_RCC); // enable clock for LED
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gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'
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led_off(); // switch off LED per default
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// setup USART and USB for user communication
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usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (for printing)
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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// minimal setup ready
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printf("welcome to the STM32F1 CuVoodoo example code\n"); // print welcome message
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// setup button
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#if defined(BUTTON_RCC) && defined(BUTTON_PORT) && defined(BUTTON_PIN) && defined(BUTTON_EXTI) && defined(BUTTON_IRQ)
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rcc_periph_clock_enable(BUTTON_RCC); // enable clock for button
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gpio_set_mode(BUTTON_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, BUTTON_PIN); // set button pin to input
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gpio_clear(BUTTON_PORT, BUTTON_PIN); // pull down to be able to detect button push (go high)
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rcc_periph_clock_enable(RCC_AFIO); // enable alternate function clock for external interrupt
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exti_select_source(BUTTON_EXTI, BUTTON_PORT); // mask external interrupt of this pin only for this port
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exti_set_trigger(BUTTON_EXTI, EXTI_TRIGGER_RISING); // trigger when button is pressed
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exti_enable_request(BUTTON_EXTI); // enable external interrupt
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nvic_enable_irq(BUTTON_IRQ); // enable interrupt
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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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// get date and time
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uint32_t ticks_time = 0;
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ticks_time = rtc_get_counter_val(); // get time/date from internal RTC
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printf("current time: %02lu:%02lu:%02lu\n", ticks_time/(60*60), (ticks_time%(60*60))/60, (ticks_time%60)); // display time
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// main loop
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printf("command input: ready\n");
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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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char c = ' '; // to store received character
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bool char_flag = false; // a new character has been received
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while (true) { // infinite loop
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while (usart_received) { // data received over UART
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action = true; // action has been performed
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led_toggle(); // toggle LED
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c = usart_getchar(); // store receive character
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char_flag = true; // notify character has been received
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}
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while (cdcacm_received) { // data received over USB
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action = true; // action has been performed
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led_toggle(); // toggle LED
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c = cdcacm_getchar(); // store receive character
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char_flag = true; // notify character has been received
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}
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while (char_flag) { // user data received
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char_flag = false; // reset flag
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action = true; // action has been performed
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printf("%c",c); // echo receive character
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if (c=='\r' || c=='\n') { // end of command received
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if (command_i>0) { // there is a command to process
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command[command_i] = 0; // end string
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command_i = 0; // prepare for next command
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process_command(command); // process user command
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}
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} else { // user command input
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command[command_i] = c; // save command input
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if (command_i<LENGTH(command)-2) { // verify if there is place to save next character
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command_i++; // save next character
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}
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}
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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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ticks_time = rtc_get_counter_val(); // copy time from internal RTC for processing
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action = true; // action has been performed
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if ((ticks_time%(60*60))==0) { // one minute passed
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printf("%02lu:%02lu:%02lu\n", ticks_time/(60*60), (ticks_time%(60*60))/60, (ticks_time%60)); // display external time
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}
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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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}
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return 0;
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}
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#if defined(BUTTON_ISR) && defined(BUTTON_EXTI)
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/** interrupt service routine called when button is pressed */
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void BUTTON_ISR(void)
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{
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exti_reset_request(BUTTON_EXTI); // reset interrupt
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button_flag = true; // perform button action
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}
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#endif
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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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