mirror of
https://github.com/eddyem/ARMsingleboard.git
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130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/*
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* This file is part of the sihtu project.
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* Copyright 2022 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 <math.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <usefull_macros.h>
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#include "htu21d.h"
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#include "si7005.h"
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#include "i2c.h"
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#define DEVADDR (0x40)
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typedef struct{
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char *device;
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int help;
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int heater;
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} glob_pars;
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static glob_pars G = {.device = "/dev/i2c-3", .heater = -1};
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static myoption cmdlnopts[] = {
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{"help", NO_ARGS, NULL, 'h', arg_int, APTR(&G.help), _("show this help")},
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{"device", NEED_ARG, NULL, 'd', arg_string, APTR(&G.device), _("I2C device path")},
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{"heater", NEED_ARG, NULL, 'H', arg_int, APTR(&G.heater), _("turn on (>0) or off (0) heater")},
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end_option
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};
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static void showd(float T, float H){
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// Sonntag1990
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#define dB 17.62f
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#define dC 243.12f
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if(T < -273.15f || H < 0.f) return;
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float gamma = logf(H/100.f) + dB*T/(dC + T);
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float Tdp = dC * gamma / (dB - gamma);
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printf("T=%.1fC, H=%.1f%%, Tdp=%.1fC\n", T, H, Tdp);
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static int i = 0;
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if(++i > 3) signals(0);
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}
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static void processSI(){
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static double t0 = 0.;
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si7005_process();
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si7005_status s = si7005_get_status();
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if(s == SI7005_RELAX){
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if(dtime() - t0 > 1.){
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DBG("need to start measure");
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if(si7005_startmeasure()) t0 = dtime();
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}
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}else if(s == SI7005_RDY){ // humidity can be shown
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DBG("Got data");
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float T, H;
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if(!si7005_getTH(&T, &H)) return;
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showd(T, H);
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t0 = dtime();
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}else if(s == SI7005_ERR){
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DBG("got error");
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if(si7005_startmeasure()) t0 = dtime();
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}
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}
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static void processHTU(){
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static double t0 = 0.;
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HTU21D_process();
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HTU21D_status s = HTU21D_get_status();
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if(s == HTU21D_RELAX){
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if(dtime() - t0 > 1.){
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DBG("need to start measure");
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if(HTU21D_startmeasure()) t0 = dtime();
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}
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}else if(s == HTU21D_RDY){ // humidity can be shown
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DBG("Got data");
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float T, H;
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if(!HTU21D_getTH(&T, &H)) return;
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showd(T, H);
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t0 = dtime();
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}else if(s == HTU21D_ERR){
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DBG("got error");
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if(HTU21D_startmeasure()) t0 = dtime();
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}
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}
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int main(int argc, char **argv){
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initial_setup();
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parseargs(&argc, &argv, cmdlnopts);
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if(G.help) showhelp(-1, cmdlnopts);
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if(!i2c_open(G.device)) ERR("Can't open %s", G.device);
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if(!i2c_set_slave_address((uint8_t)DEVADDR)){
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WARN("Can't set slave address 0x%02x", DEVADDR);
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goto clo;
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}
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//if(!i2c_read_reg8(0, NULL)) ERR("Can't connect!");
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int si = 1; // == 0 if htu
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if(!si7005_read_ID()){
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DBG("Don't see SI7005");
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si = 0;
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if(!HTU21D_read_ID()){
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ERRX("Neither SI7005 nor HTU21D not found");
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}else while(!HTU21D_startmeasure()) usleep(1000);
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}else while(!si7005_startmeasure()) usleep(1000);
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if(G.heater > -1){
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int ans = FALSE;
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if(si) ans = si7005_heater(G.heater);
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else ans = HTU21D_heater(G.heater);
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if(!ans) WARNX("Can't turn on heater");
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}
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while(1){
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if(si) processSI();
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else processHTU();
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}
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clo:
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i2c_close();
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return 0;
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}
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