add HTU21D

F1-nolib/SI7005/Readme

@@ -1 +0,0 @@
-Work with I2C humidity/temperature sensor SI7005

F1-nolib/SI7005_HTU21D/Readme

@@ -0,0 +1 @@
+Work with I2C humidity/temperature sensors SI7005 & HTU21D

F1-nolib/SI7005_HTU21D/dewpoint.c

@@ -54,7 +54,7 @@ float ln(uint16_t RH){
     }
     if(idx < 0) idx = 0;
     else if(idx > NKNOTS-1) idx = NKNOTS - 1;
-    USB_send("idx="); USB_send(u2str(idx)); USB_send("\n");
+    //USB_send("idx="); USB_send(u2str(idx)); USB_send("\n");
     float l = Y[idx] + K[idx]*(RH - X[idx]);
 #undef NKNOTS
     return l;

F1-nolib/SI7005_HTU21D/htu21d.c

@@ -0,0 +1,155 @@
+/*
+ * This file is part of the si7005 project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "htu21d.h"
+#include "i2c.h"
+
+#define DEVID  (0x40)
+
+#ifdef EBUG
+#include "usb.h"
+#include "proto.h"
+#define DBG(x)  do{USB_send(x);}while(0)
+#else
+#define DBG(x)
+#endif
+
+// read with no hold master!
+#define HTU21_READ_TEMP     (0xF3)
+#define HTU21_READ_HUMID    (0xF5)
+#define HTU21_READ_REG      (0xE7)
+#define HTU21_WRITE_REG     (0xE6)
+#define HTU21_SOFT_RESET    (0xFE)
+// status mask & val
+#define HTU21_STATUS_MASK   (0x03)
+#define HTU21_HUMID_FLAG    (0x02)
+// user reg fields
+#define HTU21_REG_VBAT      (0x40)
+#define HTU21_REG_D1        (0x80)
+#define HTU21_REG_D0        (0x01)
+#define HTU21_REG_HTR       (0x04)
+#define HTU21_REG_ODIS      (0x02)
+
+typedef enum{
+	RELAX = 0,
+	WAITFORT,       // T
+	WAITFORH        // humidity
+} HTU21D_state;
+
+static HTU21D_state state = RELAX;
+static HTU21D_status htustatus = HTU21D_RELAX;
+static uint16_t TH; // data for T or H
+
+HTU21D_status HTU21D_get_status(){
+    return htustatus;
+}
+
+//output in Cx10
+int32_t HTU21D_getT(){
+    DBG("HTU getT\n");
+    htustatus = HTU21D_RELAX;
+    if(TH & HTU21_HUMID_FLAG) return -5000; // humidity measured
+    uint32_t a = TH & 0xFFFC;
+    a *= 17572;
+    a >>= 16;
+    int32_t val = (a - 4685)/10;
+    return val;
+}
+
+//output in %x10
+uint32_t HTU21D_getH(){
+    DBG("HTU getH\n");
+    htustatus = HTU21D_RELAX;
+    if(!(TH & HTU21_HUMID_FLAG)) return 5000; // temperature measured
+    uint32_t a = TH & 0xFFFC;
+    a *= 1250;
+    a >>= 16;
+    a -= 60;
+    return a;
+}
+
+void HTU21D_setup(){
+    DBG("HTU setup\n");
+    htustatus = HTU21D_RELAX;
+    state = RELAX;
+	i2c_setup();
+	i2c_set_addr7(DEVID);
+}
+
+
+#define SHIFTED_DIVISOR 0x988000    //This is the 0x0131 polynomial shifted to farthest left of three bytes
+// check CRC, return 0 if all OK
+static uint32_t htu_check_crc(uint8_t *crc){
+    DBG("HTU check CRC\n");
+    uint32_t remainder = (crc[0] << 16) | (crc[1] << 8) | crc[2];
+    uint32_t divsor = (uint32_t)SHIFTED_DIVISOR;
+    int i;
+    for(i = 0; i < 16; i++) {
+        if (remainder & (uint32_t)1 << (23 - i))
+            remainder ^= divsor;
+        divsor >>= 1;
+    }
+    return remainder;
+}
+
+static int htusendcmd(uint8_t cmd){
+    DBG("htu cmd\n");
+    if(state != RELAX) return 1;
+    htustatus = HTU21D_BUSY;
+    if(I2C_OK != i2c_7bit_send_onebyte(cmd, 1)){
+        htustatus = HTU21D_ERR;
+        DBG("htu read err\n");
+        return 1;
+    }
+    return 0;
+}
+
+int HTU21D_cmdT(){
+    DBG("htu read T\n");
+    if(htusendcmd(HTU21_READ_TEMP)) return 1;
+    state = WAITFORT;
+    return 0;
+}
+
+int HTU21D_cmdH(){
+    DBG("htu read H\n");
+    if(htusendcmd(HTU21_READ_HUMID)) return 1;
+    state = WAITFORH;
+    return 0;
+}
+
+void HTU21D_process(){
+    uint8_t d[3];
+    if(state == RELAX) return;
+	if(state == WAITFORH || state == WAITFORT){ // poll RDY
+        if(I2C_OK != i2c_7bit_receive(d, 3)) return; // NACKed
+        DBG("HTU got H or T:");
+        DBG(u2str(d[0])); DBG(", ");
+        DBG(u2str(d[1])); DBG(", ");
+        DBG(u2str(d[2])); DBG("\n");
+        if(htu_check_crc(d)){
+            htustatus = HTU21D_ERR;
+            DBG("CRC failed\n");
+            state = RELAX;
+            return;
+        }
+        TH = (d[0] << 8) | d[1];
+        htustatus = (state == WAITFORH) ? HTU21D_HRDY : HTU21D_TRDY;
+        state = RELAX;
+    }
+}

F1-nolib/SI7005_HTU21D/htu21d.h

@@ -0,0 +1,42 @@
+/*
+ * This file is part of the HTU21D project.
+ * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#ifndef HTU21D_H__
+
+#include <stm32f1.h>
+
+typedef enum{
+    HTU21D_BUSY,        // measurement in progress
+    HTU21D_ERR,         // error in I2C
+    HTU21D_RELAX,       // relaxed state
+    HTU21D_TRDY,        // data ready - can get it
+    HTU21D_HRDY
+} HTU21D_status;
+
+HTU21D_status HTU21D_get_status();
+
+void HTU21D_setup();
+int HTU21D_read_ID(uint8_t *devid);
+int HTU21D_cmdT();
+int HTU21D_cmdH();
+void HTU21D_process();
+int32_t HTU21D_getT();
+uint32_t HTU21D_getH();
+
+#define HTU21D_H__
+#endif // HTU21D_H__

F1-nolib/SI7005_HTU21D/i2c.c

@@ -170,19 +170,67 @@ i2c_status i2c_7bit_receive_twobytes(uint8_t *data){
     //I2C_LINEWAIT();
     I2C1->CR1 |= I2C_CR1_START | I2C_CR1_POS | I2C_CR1_ACK; // generate start sequence, set pos & ack
     I2C_WAIT(I2C1->SR1 & I2C_SR1_SB);       // wait for SB
+    DBG("2 Rx sb\n");
     (void) I2C1->SR1;                       // clear SB
     I2C1->DR = addr7r;                      // set address
     I2C_WAIT(I2C1->SR1 & I2C_SR1_ADDR);     // wait for ADDR flag
+    DBG("2 ADDR\n");
     if(I2C1->SR1 & I2C_SR1_AF){             // NACK
         ret = I2C_NACK;
         goto eotr;
     }
+    DBG("2 ACK\n");
     (void) I2C1->SR2;                       // clear ADDR
     I2C1->CR1 &= ~I2C_CR1_ACK;              // clear ACK
     I2C_WAIT(I2C1->SR1 & I2C_SR1_BTF);      // wait for BTF
+    DBG("2 BTF\n");
     I2C1->CR1 |= I2C_CR1_STOP;              // program STOP
     *data++ = I2C1->DR; *data = I2C1->DR;   // read data & clear RxNE
     ret = I2C_OK;
 eotr:
     return ret;
 }
+
+// receive any amount of bytes
+i2c_status i2c_7bit_receive(uint8_t *data, uint16_t nbytes){
+    if(nbytes == 0) return I2C_HWPROBLEM;
+    I2C1->SR1 = 0; // clear previous NACK flag & other error flags
+    if(nbytes == 1) return i2c_7bit_receive_onebyte(data, 1);
+    else if(nbytes == 2) return i2c_7bit_receive_twobytes(data);
+    i2c_status ret = I2C_LINEBUSY;
+    //I2C_LINEWAIT();
+    I2C1->CR1 |= I2C_CR1_START | I2C_CR1_ACK; // generate start sequence, set pos & ack
+    I2C_WAIT(I2C1->SR1 & I2C_SR1_SB);       // wait for SB
+    DBG("got SB\n");
+    (void) I2C1->SR1;                       // clear SB
+    I2C1->DR = addr7r;                      // set address
+    I2C_WAIT(I2C1->SR1 & I2C_SR1_ADDR);     // wait for ADDR flag
+    DBG("send addr\n");
+    if(I2C1->SR1 & I2C_SR1_AF){             // NACK
+        DBG("NACKed\n");
+        ret = I2C_NACK;
+        goto eotr;
+    }
+    DBG("ACKed\n");
+    (void) I2C1->SR2;                       // clear ADDR
+    for(uint16_t x = nbytes - 3; x > 0; --x){
+        I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE); // wait next byte
+        *data++ = I2C1->DR;                 // get data
+    }
+    DBG("three left\n");
+    // three bytes remain to be read
+    I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE);     // wait dataN-2
+    DBG("dataN-2\n");
+    I2C_WAIT(I2C1->SR1 & I2C_SR1_BTF);      // wait for BTF
+    DBG("BTF\n");
+    I2C1->CR1 &= ~I2C_CR1_ACK;              // clear ACK
+    *data++ = I2C1->DR;                     // read dataN-2
+    I2C1->CR1 |= I2C_CR1_STOP;              // program STOP
+    *data++ = I2C1->DR;                     // read dataN-1
+    I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE);     // wait next byte
+    *data = I2C1->DR;                       // read dataN
+    DBG("got it\n");
+    ret = I2C_OK;
+eotr:
+    return ret;
+}

F1-nolib/SI7005_HTU21D/i2c.h

@@ -35,6 +35,7 @@ i2c_status i2c_7bit_send_onebyte(uint8_t data, uint8_t stop);
 i2c_status i2c_7bit_send(const uint8_t *data, int datalen);
 i2c_status i2c_7bit_receive_onebyte(uint8_t *data, uint8_t stop);
 i2c_status i2c_7bit_receive_twobytes(uint8_t *data);
+i2c_status i2c_7bit_receive(uint8_t *data, uint16_t nbytes);
 
 #define I2C_H__
 #endif // I2C_H__

F1-nolib/SI7005_HTU21D/main.c

@@ -18,6 +18,7 @@
 
 #include "dewpoint.h"
 #include "hardware.h"
+#include "htu21d.h"
 #include "proto.h"
 #include "si7005.h"
 #include "usb.h"
@@ -68,6 +69,7 @@ int main(void){
     StartHSE();
     hw_setup();
     si7005_setup();
+    HTU21D_setup();
     SysTick_Config(72000);
 
     RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
@@ -85,17 +87,20 @@ int main(void){
         }
         usb_proc();
         si7005_process();
+        HTU21D_process();
+        HTU21D_status h = HTU21D_get_status();
         si7005_status s = si7005_get_status();
-        if(s == SI7005_HRDY){ // humidity can be shown
-            //USB_send(u2str(Tms)); USB_send("\n");
-            mH = si7005_getH();
+
+        if(s == SI7005_HRDY || h == HTU21D_HRDY){ // humidity can be shown
+            if(s == SI7005_HRDY) mH = si7005_getH();
+            else mH = HTU21D_getH();
             USB_send("Hum=");
             USB_send(u2str(mH));
             USB_send("*10%\n");
             showd(mT, mH);
-        }else if(s == SI7005_TRDY){ // T can be shown
-            //USB_send(u2str(Tms)); USB_send("\n");
-            mT = si7005_getT();
+        }else if(s == SI7005_TRDY || h == HTU21D_TRDY){ // T can be shown
+            if(s == SI7005_TRDY) mT = si7005_getT();
+            else mT = HTU21D_getT();
             int32_t T = mT;
             USB_send("T=");
             if(T < 0){
@@ -105,9 +110,10 @@ int main(void){
             USB_send(u2str(T));
             USB_send("*10degrC\n");
             showd(mT, mH);
-        }else if(s == SI7005_ERR){
+        }else if(s == SI7005_ERR || h == HTU21D_ERR){
             USB_send("Error in H/T measurement\n");
             si7005_setup();
+            HTU21D_setup();
         }
 
         char *txt, *ans;

F1-nolib/SI7005_HTU21D/proto.c

@@ -17,6 +17,7 @@
  */
 
 #include "dewpoint.h"
+#include "htu21d.h"
 #include "proto.h"
 #include "si7005.h"
 #include "usb.h"
@@ -156,10 +157,10 @@ char *getnum(const char *txt, uint32_t *N){
 const char* helpmsg =
     "'0' - reset I2C\n"
     "'I' - read SI7005 device ID\n"
-    "'H' - start Humidity measurement\n"
+    "'hH' - start Humidity measurement (h-si,H-htu)\n"
     "'N' - read number (0..1000) and show its ln\n"
     "'R' - software reset\n"
-    "'T' - start Temperature measurement\n"
+    "'tT' - start Temperature measurement (t-si,T-htu)\n"
     "'W' - test watchdog\n"
 ;
 
@@ -169,6 +170,7 @@ const char *parse_cmd(const char *buf){
         switch(*buf){
             case '0':
                 si7005_setup();
+                HTU21D_setup();
                 return "Reset I2C\n";
             break;
             /*case 'p':
@@ -185,16 +187,21 @@ const char *parse_cmd(const char *buf){
                     USB_send("\n");
                 }else USB_send("Can't read ID\n");
             break;
+            case 'h':
+                if(si7005_cmdH()) USB_send("SI7005 not found\n");
+            break;
             case 'H':
-                if(si7005_cmdH()) USB_send("Humid. read error\n");
+                if(HTU21D_cmdH()) USB_send("HTU21D not found\n");
             break;
             case 'R':
                 USB_send("Soft reset\n");
                 NVIC_SystemReset();
             break;
+            case 't':
+                if(si7005_cmdT()) USB_send("SI7005 not found\n");
+            break;
             case 'T':
-                if(si7005_cmdT()) USB_send("Temper. read error\n");
-                //USB_send(u2str(Tms)); USB_send("\n");
+                if(HTU21D_cmdT()) USB_send("HTU21D not found\n");
             break;
             case 'W':
                 USB_send("Wait for reboot\n");

F1-nolib/SI7005_HTU21D/si7005.c

@@ -83,6 +83,7 @@ int si7005_cmdT(){
     sistatus = SI7005_BUSY;
 	i2c_status st = i2c_7bit_send(cmd, 2);
 	if(st != I2C_OK){
+        sistatus = SI7005_ERR;
 		return 1;
 	}
     DBG("Wait for T\n");
@@ -101,6 +102,7 @@ int si7005_cmdH(){
     sistatus = SI7005_BUSY;
 	i2c_status st = i2c_7bit_send(cmd, 2);
 	if(st != I2C_OK){
+        sistatus = SI7005_ERR;
 		return 1;
 	}
 	state = WAITFORH;
@@ -117,7 +119,7 @@ int32_t si7005_getT(){ // T*10
     return d;
 }
 uint32_t si7005_getH(){ // hum * 10
-    if(sistatus != SI7005_HRDY) return 0;
+    if(sistatus != SI7005_HRDY) return 5000;
     TH >>= 4;
     uint32_t d = (TH*10)/16 - 240;
     sistatus = SI7005_RELAX;