mirror of
https://github.com/eddyem/stm32samples.git
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123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*
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* main.c
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*
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* Copyright 2017 Edward V. Emelianoff <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 <string.h>
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#include "stm32f0.h"
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#include "usart.h"
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#include "morse.h"
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volatile uint32_t Tms = 0;
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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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static void gpio_setup(void){
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/* Enable clocks to the GPIO subsystems (A&B) */
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
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/* Set green leds (PA4 & PA6) as output; AF1 to enable timer on PA6 */
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GPIOA->MODER = GPIO_MODER_MODER4_O | GPIO_MODER_MODER6_AF;
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GPIOA->AFR[0] |= 1<<24; // AF1
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GPIOA->OTYPER = 1 << 6; // PA6 - opendrain, PA4 - pushpull
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}
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// Tim3_ch1 - PA6, 48MHz -> 1kHz
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static void tim3_setup(){
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RCC->APB1ENR |= RCC_APB1ENR_TIM3EN; // enable clocking
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RCC->AHBENR |= RCC_AHBENR_DMA1EN;
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TIM3->CCMR1 = TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1; // PWM mode 1: acive->inactive, preload enable
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TIM3->PSC = 47999; // 1kHz
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TIM3->ARR = WRD_GAP;
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TIM3->CCR1 = 0;
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TIM3->CCER = TIM_CCER_CC1P | TIM_CCER_CC1E; // turn it on, active low
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TIM3->EGR |= TIM_EGR_UG;
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// DMA ch3 - TIM3_UP
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DMA1_Channel3->CPAR = (uint32_t)(&(TIM3->DMAR)); // TIM3_ch1
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DMA1_Channel3->CMAR = (uint32_t)(mbuff);
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DMA1_Channel3->CNDTR = 0;
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// memsiz 16bit, psiz 32bit, memincrement, from memory
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DMA1_Channel3->CCR |= DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_1
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| DMA_CCR_MINC | DMA_CCR_DIR;
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TIM3->DCR = (2 << 8) // three bytes
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+ (((uint32_t)&TIM3->ARR - (uint32_t)&TIM3->CR1) >> 2);
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TIM3->DIER = TIM_DIER_UDE; // enable DMA requests
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DMA1_Channel3->CCR |= DMA_CCR_TCIE; // enable TC interrupt
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}
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char buftoping[256] = {0}, *nxtltr = buftoping;
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int main(void){
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uint32_t lastT = 0; // last time counter value
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int L = 0; // length
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char *txt;
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sysreset();
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SysTick_Config(6000, 1);
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gpio_setup();
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tim3_setup();
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USART1_config();
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int first = 1; // first letter in phrase
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while (1){
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if(dmaflag){
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dmaflag = 0;
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if(*nxtltr){
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DMA1_Channel3->CCR &= ~DMA_CCR_EN;
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while(ALL_OK != usart1_send(nxtltr, 1));
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uint8_t x;
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nxtltr = fillbuffer(nxtltr, &x);
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if(x){
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DMA1_Channel3->CNDTR = 3 * x;
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DMA1_Channel3->CCR |= DMA_CCR_EN;
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//x += '0';
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//while(ALL_OK != usart1_send((char*)&x, 1));
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if(first){ // first letter in message
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first = 0;
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TIM3->CR1 |= TIM_CR1_CEN;
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TIM3->EGR |= TIM_EGR_UG; // force update generation
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}
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}
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}else{
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TIM3->CR1 &= ~TIM_CR1_CEN; // turn timer off
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first = 1;
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}
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}
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if(lastT > Tms || Tms - lastT > 499){
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pin_toggle(GPIOA, 1<<4); // blink by onboard LED once per second
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lastT = Tms;
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}
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if(usart1rx()){ // usart1 received data, store in in buffer
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L = usart1_getline(&txt);
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if(L < 256 && !*nxtltr){
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memcpy(buftoping, txt, L);
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buftoping[L] = 0;
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nxtltr = buftoping;
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dmaflag = 1; //
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usart1_send("Send ", 5);
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while(ALL_OK != usart1_send(txt, L));
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}else usart1_send("Please, wait\n", 13);
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}
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/* if(L){ // text waits for sending
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if(ALL_OK == usart1_send(txt, L)){
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L = 0;
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}
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}*/
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}
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}
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