mirror of
https://github.com/eddyem/stm32samples.git
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102 lines
2.7 KiB
C
102 lines
2.7 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 <stm32f0.h>
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#include "spi.h"
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#include "usart.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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// Set green led (PB3) as output - no, PB3 is SCK!
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//RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
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//GPIOB->MODER = GPIO_MODER_MODER3_O;
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}
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static void printuhex(uint8_t *arr, uint8_t l){
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if(l > 32 || l == 0) return;
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char buf[70] = "0x";
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int8_t i, j, bidx = 2;
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for(i = 0; i < l; ++i, ++arr){
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for(j = 1; j > -1; --j){
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uint8_t half = (*arr >> (4*j)) & 0x0f;
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if(half < 10) buf[bidx++] = half + '0';
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else buf[bidx++] = half - 10 + 'a';
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}
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}
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buf[bidx++] = '\n';
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SEND(buf, bidx);
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}
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static void print14bit(uint8_t *arr){
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uint8_t _16[2];
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_16[0] = (arr[0]>>4)&3; _16[1] = (arr[0]<<4) | (arr[1] >> 4);
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printuhex(_16, 2);
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//SEND("\n\n", 2);
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}
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int main(void){
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uint32_t /*lastT = 0,*/ dctr = 0;
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int16_t L = 0;
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uint8_t buf[SPIBUFSZ], len;
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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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spi_setup();
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usart2_setup();
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while (1){
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/* if(Tms - lastT > 499){
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pin_toggle(GPIOB, 1<<3); // blink by onboard LED once per second
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lastT = Tms;
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}*/
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if(usart2rx()){ // usart1 received data, store in in buffer
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L = usart2_getline(&txt);
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// do something with received data
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}
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if(L){ // text waits for sending
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if(ALL_OK == usart2_send(txt, L)){
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L = 0;
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}
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}
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len = SPIBUFSZ;
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uint8_t a = SPI_getdata(buf, &len);
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if(a){
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//printuhex(buf, len);
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print14bit(buf);
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}
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if(Tms - dctr > 999){// once per 1 second
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dctr = Tms;
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//SEND("pre\n", 4);
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SPI_prep_receive();
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}
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}
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return 0;
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}
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