mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 10:45:11 +03:00
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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* This file is part of the BMP180 project.
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* Copyright 2020 Edward V. Emelianov <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 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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#include "BMP180.h"
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#include "hardware.h"
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#include "proto.h"
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#include "usb.h"
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#include "usb_lib.h"
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#define USBBUFSZ 127
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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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// usb getline
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static char *get_USB(){
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static char tmpbuf[USBBUFSZ+1], *curptr = tmpbuf;
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static int rest = USBBUFSZ;
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int x = USB_receive(curptr);
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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 = USBBUFSZ;
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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 = USBBUFSZ;
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USB_send("USB buffer overflow\n");
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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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hw_setup();
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SysTick_Config(72000);
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RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
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USBPU_OFF();
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USB_setup();
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BMP180_init();
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iwdg_setup();
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USBPU_ON();
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while (1){
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IWDG->KR = IWDG_REFRESH; // refresh watchdog
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if(lastT > Tms || Tms - lastT > 499){
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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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BMP180_process(Tms);
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BMP180_status s = BMP180_get_status();
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if(s == BMP180_RDY){ // data ready - get it
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int32_t T;
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uint32_t P;
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BMP180_getdata(&T, &P);
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USB_send("T="); USB_send(i2str(T)); USB_send(" (/10degC)\nP=");
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USB_send(u2str(P)); USB_send(" (Pa) or ");
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float mm = P*0.0750062;
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USB_send(u2str(mm)); USB_send(" (/10mmHg)\n");
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}else if(s == BMP180_ERR){
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USB_send("Error in measurement\n");
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BMP180_reset();
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BMP180_init();
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}
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char *txt, *ans;
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if((txt = get_USB())){
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IWDG->KR = IWDG_REFRESH;
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ans = (char*)parse_cmd(txt);
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if(ans){
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uint16_t l = 0; char *p = ans;
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while(*p++) l++;
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USB_send(ans);
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}
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}
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}
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return 0;
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}
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