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https://github.com/eddyem/stm32samples.git
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restructuring
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195
F1:F103/uart/main.c
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195
F1:F103/uart/main.c
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/*
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* main.c
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*
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* Copyright 2018 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* 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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "stm32f1.h"
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#include "usart.h"
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// debounce pause (ms - 1)
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#define DEBOUNCE_PAUSE (9)
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static volatile uint32_t Tms = 0; // milliseconds from last reset
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// Called when systick fires
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void sys_tick_handler(void){
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++Tms;
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}
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// setup
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static void gpio_setup(void){
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// Enable clocks to the GPIO subsystems
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RCC->APB2ENR |= RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN;
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// Set leds (PB8/PB9) as opendrain output
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GPIOB->CRH = CRH(8, CNF_ODOUTPUT|MODE_SLOW) | CRH(9, CNF_ODOUTPUT|MODE_SLOW);
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// Set buttons (PC0/1) as inputs with weak pullups
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GPIOC->ODR = 3; // pullups for PC0/1
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GPIOC->CRL = CRL(0, CNF_PUDINPUT|MODE_INPUT) | CRL(1, CNF_PUDINPUT|MODE_INPUT);
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}
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typedef enum{
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BTN_PRESSED
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,BTN_RELEASED
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,BTN_DEBOUNCE
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,BTN_RELAX
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} button_state;
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button_state check_state(uint8_t N){
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static uint32_t tlast[2] = {0,0};
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static button_state oldstate[2] = {BTN_RELEASED, BTN_RELEASED};
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button_state s = BTN_RELAX;
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uint8_t b = pin_read(GPIOC, N+1); // == 1 if button released
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if(b){
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switch(oldstate[N]){
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case BTN_PRESSED: // debounce pause for DEBOUNCE_PAUSE ms
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s = oldstate[N] = BTN_DEBOUNCE;
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tlast[N] = Tms;
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break;
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case BTN_DEBOUNCE: // check debounce pause
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if(Tms - tlast[N] > DEBOUNCE_PAUSE){
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s = oldstate[N] = BTN_RELEASED;
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}
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break;
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default: // BTN_RELEASED - do nothing -> return BTN_RELAX
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;
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}
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}else{
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switch(oldstate[N]){
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case BTN_RELEASED:
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s = BTN_PRESSED; // button was just pressed
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__attribute__((fallthrough)); // change oldstate too
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case BTN_DEBOUNCE: // change old state to BTN_PRESSED again
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oldstate[N] = BTN_PRESSED; // returned state still relax
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break;
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default: // BTN_PRESSED before - do nothing
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;
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}
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}
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return s;
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}
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int main(){
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int L;
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char *txt;
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sysreset();
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StartHSE();
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gpio_setup();
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usart_setup();
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uint32_t Told = 0;
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SysTick_Config(72000); // interrupt each ms
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SEND("Greetings!"); newline();
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pin_set(GPIOB, 3<<8); // turn off LEDs
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/* Do nothing in main loop */
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while (1){
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if(Tms - Told > 499){ // blink LED1 every 1 second
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pin_toggle(GPIOB, 1<<9);
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Told = Tms;
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transmit_tbuf();
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}
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if(usartrx()){ // usart1 received data, store in in buffer
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L = usart_getline(&txt);
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char _1st = txt[0];
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if(L == 2 && txt[1] == '\n'){
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L = 0;
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switch(_1st){
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case '0': // turn off LED2
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SEND("LED2 off");
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pin_set(GPIOB, 1<<8);
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newline();
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break;
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case '1': // turn it on
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SEND("LED2 on");
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pin_clear(GPIOB, 1<<8);
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newline();
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break;
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case 's':
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case 'S':
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SEND("LED2 state: ");
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if(pin_read(GPIOB, 1<<8)) SEND("off");
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else SEND("on");
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newline();
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break;
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default: // help
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SEND(
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"'0' - turn off LED2\n"
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"'1' - turn on LED2\n"
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"'s' - test LED2 state\n"
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);
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break;
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}
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}
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transmit_tbuf();
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}
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if(L){ // echo all other data
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txt[L] = 0;
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usart_send(txt);
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transmit_tbuf();
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L = 0;
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}
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for(int i = 0; i < 2; ++i){
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const char *st = NULL;
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switch(check_state(i)){
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case BTN_PRESSED:
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st = "pressed";
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break;
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case BTN_RELEASED:
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st = "released";
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break;
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default:
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; // nothing
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}
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if(st){
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SEND("The button");
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usart_putchar('2' + i);
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SEND(" was ");
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SEND(st);
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newline();
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}
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}
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/*
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uint8_t
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if(pin_read(GPIOC, 1) && pin_read(GPIOC, 2)){ // no buttons present - morze @ LED1 (PB9)
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if(oldctr != blink_ctr){
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uint32_t T = blink_ctr % 18;
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systick_setup(L[T]);
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if(T & 1) pin_set(GPIOB, 1<<9);
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else pin_clear(GPIOB, 1<<9);
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oldctr = blink_ctr;
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}
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}else{ // button pressed: turn ON given LED
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if(pin_read(GPIOC, 1) == 0){ // PC0 pressed (button S2)
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systick_setup(5);
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if(blink_ctr - oldctr > 499){
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pin_toggle(GPIOB, 1<<9);
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oldctr = blink_ctr;
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}
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}else pin_set(GPIOB, 1<<9);
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if(pin_read(GPIOC, 2) == 0){ // PC1 pressed (button S3)
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systick_setup(1);
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if(blink_ctr - oldctr > 499){
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pin_toggle(GPIOB, 1<<8);
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oldctr = blink_ctr;
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}
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}else pin_set(GPIOB, 1<<8);
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}*/
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}
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}
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