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https://github.com/eddyem/tsys01.git
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Add code & schematic for 48-channel I2C multiplexer
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eddyem
198
STM32/src4multiplexer/main.c
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198
STM32/src4multiplexer/main.c
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/*
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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 "usart.h"
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#include "i2c.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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// print 32bit unsigned int
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void printu(uint32_t val){
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char buf[11], rbuf[10];
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int l = 0, bpos = 0;
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if(!val){
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buf[0] = '0';
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l = 1;
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}else{
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while(val){
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rbuf[l++] = val % 10 + '0';
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val /= 10;
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}
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int i;
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bpos += l;
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for(i = 0; i < l; ++i){
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buf[--bpos] = rbuf[i];
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}
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}
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while(LINE_BUSY == usart_send_blocking(buf, l+bpos));
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}
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void showcoeffs(uint8_t addr){ // show norm coefficiens
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int i;
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const uint8_t regs[5] = {0xAA, 0xA8, 0xA6, 0xA4, 0xA2}; // commands for coefficients
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uint32_t K;
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char numbr = (addr == TSYS01_ADDR0) ? '0' : '1';
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for(i = 0; i < 5; ++i){
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if(write_i2c(addr, regs[i])){
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if(read_i2c(addr, &K, 2)){
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char b[4] = {'K', numbr, i+'0', '='};
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while(ALL_OK != usart_send_blocking(b, 4));
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printu(K);
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while(ALL_OK != usart_send_blocking("\n", 1));
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}
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}
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}
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}
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void ch_addr(char *str){
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char ch;
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uint32_t L = 0;
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for(ch = *str++; ch && ch > '/' && ch < ':'; ch = *str++){
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L = L * 10 + ch - '0';
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if(L > 47){
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SEND("Bad address!\n");
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return;
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}
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}
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MUL_ADDRESS(L);
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printu(L);
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SEND(" channel active\n");
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}
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int main(void){
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uint32_t lastT = 0;
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int16_t L = 0;
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uint32_t started0=0, started1=0; // time of measurements for given sensor started
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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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usart_setup();
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i2c_setup(LOW_SPEED);
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// reset on start
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write_i2c(TSYS01_ADDR0, TSYS01_RESET);
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write_i2c(TSYS01_ADDR1, TSYS01_RESET);
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while (1){
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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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if(started0 && Tms - started0 > CONV_TIME){ // poll sensor0
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if(write_i2c(TSYS01_ADDR0, TSYS01_ADC_READ)){
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uint32_t t;
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if(read_i2c(TSYS01_ADDR0, &t, 3)){
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while(ALL_OK != usart_send_blocking("T0=", 3));
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printu(t);
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while(ALL_OK != usart_send_blocking("\n", 1));
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started0 = 0;
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}
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}
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}
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if(started1 && Tms - started1 > CONV_TIME){ // poll sensor1
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if(write_i2c(TSYS01_ADDR1, TSYS01_ADC_READ)){
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uint32_t t;
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if(read_i2c(TSYS01_ADDR1, &t, 3)){
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while(ALL_OK != usart_send_blocking("T1=", 3));
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printu(t);
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while(ALL_OK != usart_send_blocking("\n", 1));
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started1 = 0;
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}
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}
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}
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if(usartrx()){ // usart1 received data, store in in buffer
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L = usart_getline(&txt);
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char _1st = txt[0];
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if(_1st > '/' && _1st < ':'){
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ch_addr(txt);
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L = 0;
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}else if(L == 2 && txt[1] == '\n'){
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L = 0;
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uint32_t tstart = Tms;
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switch(_1st){
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case 'C': // 'C' - show coefficients
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showcoeffs(TSYS01_ADDR0);
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showcoeffs(TSYS01_ADDR1);
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break;
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case 'R': // 'R' - reset both
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SEND("Reset\n");
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write_i2c(TSYS01_ADDR0, TSYS01_RESET);//) SEND("0 - err\n");
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write_i2c(TSYS01_ADDR1, TSYS01_RESET);//) SEND("1 - err\n");
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break;
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case 'D':
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if(write_i2c(TSYS01_ADDR0, TSYS01_RESET)) SEND("0");
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if(write_i2c(TSYS01_ADDR1, TSYS01_RESET)) SEND("1");
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SEND("\n");
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break;
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case 't':
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SEND("USART");
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SEND(" test ");
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printu(111);
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SEND(" got number 111?\n");
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break;
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case 'T': // 'T' - get temperature
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if(tstart == 0) tstart = 1;
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if(write_i2c(TSYS01_ADDR0, TSYS01_START_CONV)) started0 = tstart;
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else{
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//SEND("0 BAD\n");
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started0 = 0;
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}
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if(write_i2c(TSYS01_ADDR1, TSYS01_START_CONV)) started1 = tstart;
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else{
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//SEND("1 BAD\n");
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started1 = 0;
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}
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break;
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case 'L':
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i2c_setup(LOW_SPEED);
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SEND("Low speed\n");
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break;
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case 'H':
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i2c_setup(HIGH_SPEED);
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SEND("High speed\n");
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break;
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default: // help
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SEND("'C' - show coefficients\n"
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"'D' - slave discovery\n"
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"'R' - reset both\n"
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"'T' - get temperature\n"
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"'t' - USART test\n"
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"number - set active channel\n"
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"'L' - low speed\n"
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"'H' - high speed\n");
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break;
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}
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}
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}
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if(L){ // text waits for sending
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while(LINE_BUSY == usart_send(txt, L));
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L = 0;
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}
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}
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return 0;
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}
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