mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
317 lines
8.1 KiB
C
317 lines
8.1 KiB
C
/*
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* This file is part of the DS18 project.
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* Copyright 2021 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 "ds18.h"
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#include "proto.h"
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#include "usb.h"
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extern volatile uint32_t Tms;
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char *omit_spaces(const char *buf){
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while(*buf){
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if(*buf > ' ') break;
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++buf;
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}
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return (char*)buf;
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}
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// In case of overflow return `buf` and N==0xffffffff
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// read decimal number & return pointer to next non-number symbol
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static char *getdec(const char *buf, uint32_t *N){
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char *start = (char*)buf;
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uint32_t num = 0;
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while(*buf){
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char c = *buf;
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if(c < '0' || c > '9'){
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break;
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}
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if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
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*N = 0xffffff;
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return start;
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}
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num *= 10;
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num += c - '0';
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++buf;
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}
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*N = num;
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return (char*)buf;
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}
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// read hexadecimal number (without 0x prefix!)
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static char *gethex(const char *buf, uint32_t *N){
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char *start = (char*)buf;
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uint32_t num = 0;
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while(*buf){
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char c = *buf;
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uint8_t M = 0;
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if(c >= '0' && c <= '9'){
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M = '0';
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}else if(c >= 'A' && c <= 'F'){
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M = 'A' - 10;
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}else if(c >= 'a' && c <= 'f'){
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M = 'a' - 10;
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}
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if(M){
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if(num & 0xf0000000){ // overflow
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*N = 0xffffff;
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return start;
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}
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num <<= 4;
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num += c - M;
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}else{
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break;
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}
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++buf;
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}
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*N = num;
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return (char*)buf;
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}
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// read octal number (without 0 prefix!)
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static char *getoct(const char *buf, uint32_t *N){
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char *start = (char*)buf;
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uint32_t num = 0;
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while(*buf){
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char c = *buf;
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if(c < '0' || c > '7'){
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break;
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}
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if(num & 0xe0000000){ // overflow
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*N = 0xffffff;
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return start;
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}
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num <<= 3;
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num += c - '0';
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++buf;
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}
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*N = num;
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return (char*)buf;
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}
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// read binary number (without b prefix!)
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static char *getbin(const char *buf, uint32_t *N){
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char *start = (char*)buf;
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uint32_t num = 0;
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while(*buf){
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char c = *buf;
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if(c < '0' || c > '1'){
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break;
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}
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if(num & 0x80000000){ // overflow
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*N = 0xffffff;
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return start;
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}
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num <<= 1;
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if(c == '1') num |= 1;
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++buf;
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}
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*N = num;
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return (char*)buf;
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}
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/**
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* @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
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* @param buf - buffer with number and so on
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* @param N - the number read
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* @return pointer to first non-number symbol in buf
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* (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
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*/
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char *getnum(const char *txt, uint32_t *N){
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char *nxt = NULL;
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char *s = omit_spaces(txt);
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if(*s == '0'){ // hex, oct or 0
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if(s[1] == 'x' || s[1] == 'X'){ // hex
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nxt = gethex(s+2, N);
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if(nxt == s+2) nxt = (char*)txt;
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}else if(s[1] > '0'-1 && s[1] < '8'){ // oct
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nxt = getoct(s+1, N);
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if(nxt == s+1) nxt = (char*)txt;
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}else{ // 0
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nxt = s+1;
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*N = 0;
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}
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}else if(*s == 'b' || *s == 'B'){
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nxt = getbin(s+1, N);
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if(nxt == s+1) nxt = (char*)txt;
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}else{
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nxt = getdec(s, N);
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if(nxt == s) nxt = (char*)txt;
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}
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return nxt;
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}
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static const char *helpmesg =
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"'C' - clear match ROM\n"
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"'D' - get DS18 state\n"
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"'I' - get DS18 ID\n"
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"'M' - start measurement\n"
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"'P' - read scratchpad\n"
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"'S' - set match ROM (S 0xaa 0xbb... - 8 bytes of ID)\n"
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"'R' - software reset\n"
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"'T' - get time from start\n"
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"'W' - test watchdog\n"
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;
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// read 8 bytes of ROM and run SETROM
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static void setROM(const char *buf){
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uint8_t ID[8];
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uint32_t N;
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for(int i = 0; i < 8; ++i){
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char *nxt = getnum(buf, &N);
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if(nxt == buf || N > 0xff){
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USB_send("Wrong data: ");
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USB_send(buf);
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return;
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}
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ID[i] = (uint8_t) N;
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buf = nxt;
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}
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DS18_setID(ID);
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USB_send("Set ID to:");
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for(int i = 0; i < 8; ++i){
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USB_send(" 0x");
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printhex(ID[i]);
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}
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USB_send("\n");
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}
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const char *parse_cmd(const char *buf){
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if(buf[1] == '\n'){
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switch(*buf){
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case 'C':
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DS18_clearID();
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return "Don't send MATCH ROM\n";
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break;
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case 'D':
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switch(DS18_getstate()){
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case DS18_SLEEP:
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return "Sleeping\n";
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case DS18_RESETTING:
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return "Resetting\n";
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case DS18_DETECTING:
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return "Detecting\n";
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case DS18_DETDONE:
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return "Detection done\n";
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case DS18_READING:
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return "Measuring\n";
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case DS18_GOTANSWER:
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return "Results are ready\n";
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default:
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return "Not found\n";
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}
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break;
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case 'I':
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if(DS18_readID()) return "Reading ID..\n";
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else return "Error\n";
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case 'M':
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if(DS18_start()) return "Started\n";
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else return "Wait a little\n";
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break;
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/* case 'p':
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DS18_poll();
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return "polling\n";
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break;*/
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case 'P':
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if(DS18_readScratchpad()) return "Reading scr..\n";
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else return "Error\n";
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break;
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case 'R':
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USB_send("Soft reset\n");
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NVIC_SystemReset();
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break;
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case 'T':
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USB_send("T=");
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USB_send(u2str(Tms));
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USB_send("ms\n");
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break;
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case 'W':
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USB_send("Wait for reboot\n");
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while(1){nop();};
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break;
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default: // help
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return helpmesg;
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break;
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}
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}else{ // several letters
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switch(*buf){
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case 'S':
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setROM(buf + 1);
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break;
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default:
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return buf;
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}
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}
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return NULL;
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}
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static char *_2str(uint32_t val, uint8_t minus){
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static char strbuf[12];
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char *bufptr = &strbuf[11];
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*bufptr = 0;
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if(!val){
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*(--bufptr) = '0';
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}else{
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while(val){
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*(--bufptr) = val % 10 + '0';
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val /= 10;
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}
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}
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if(minus) *(--bufptr) = '-';
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return bufptr;
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}
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// return string with number `val`
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char *u2str(uint32_t val){
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return _2str(val, 0);
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}
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char *i2str(int32_t i){
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uint8_t minus = 0;
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uint32_t val;
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if(i < 0){
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minus = 1;
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val = -i;
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}else val = i;
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return _2str(val, minus);
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}
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void printhex(uint8_t x){
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char b[3];
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uint8_t H(uint8_t c){
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if(c < 10)
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return (c + '0');
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else
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return (c + 'a' - 10);
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}
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b[0] = H(x >> 4);
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b[1] = H(x & 0x0f);
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b[2] = 0;
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USB_send(b);
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}
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void printT(int16_t T){ // print temperature value, this function should be called from ds18.c
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USB_send("Temperature="); USB_send(i2str(T));
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USB_send("\n");
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}
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void printsp(uint8_t *b, int n){
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USB_send("Regvalue:");
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for(int i = 0; i < n; ++i){
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USB_send(" 0x");
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printhex(b[i]);
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}
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USB_send("\n");
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}
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