mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 10:45:11 +03:00
101 lines
2.5 KiB
C
101 lines
2.5 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 "hardware.h"
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#include "spi.h"
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#include "usb.h"
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#include "usb_lib.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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char *parse_cmd(char *buf){
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const uint8_t array[] = {0xf0, 0xa5, 0x5a, 0x0f};
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if(buf[1] != '\n') return buf;
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switch(*buf){
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case 'D':
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if(SPI_transmit(array, 4)) USB_send("Error in DMA transmission\n");
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else USB_send("Transmitted\n");
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break;
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case 'S':
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if(SPI1->SR & SPI_SR_TXE){
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*(uint8_t *)&(SPI1->DR) = 0xa5;
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USB_send("sent 0xa5\n");
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}else USB_send("SR_TXE isn't empty\n");
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break;
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default: // help
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return
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"'S' - send 0xa5 directly\n"
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"'D' - send 4 bytes by DMA\n"
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;
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break;
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}
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return NULL;
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}
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// usb getline
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char *get_USB(){
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static char tmpbuf[512], *curptr = tmpbuf;
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static int rest = 511;
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int x = USB_receive(curptr, rest);
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curptr[x] = 0;
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if(!x) return NULL;
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if(curptr[x-1] == '\n'){
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curptr = tmpbuf;
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rest = 511;
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return tmpbuf;
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}
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curptr += x; rest -= x;
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if(rest <= 0){ // buffer overflow
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curptr = tmpbuf;
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rest = 511;
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}
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return NULL;
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}
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int main(void){
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uint32_t lastT = 0;
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sysreset();
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StartHSE();
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SysTick_Config(72000);
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hw_setup();
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USB_setup();
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while (1){
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if(lastT > Tms || Tms - lastT > 499){
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pin_toggle(GPIOA, (1<<6));
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LED_blink(LED0);
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lastT = Tms;
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}
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usb_proc();
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char *txt, *ans;
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if((txt = get_USB())){
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ans = parse_cmd(txt);
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if(ans) USB_send(ans);
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}
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}
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return 0;
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}
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