Added software I2C on timer TIM2

2026-03-22 01:31:00 +03:00 · 2015-10-01 11:05:35 +03:00
parent 4345cedd6e
commit 99a2c601cc
14 changed files with 1386 additions and 0 deletions
--- a/si7005_softi2c/si7005.c
+++ b/si7005_softi2c/si7005.c
@@ -0,0 +1,152 @@
+/*
+ * si7005.c
+ *
+ * Copyright 2015 Edward V. Emelianoff <eddy@sao.ru, 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "soft_i2c.h"
+#include "uart.h"
+#include "si7005.h"
+
+#define DEVID  (0x40)
+
+typedef enum{
+	RELAX = 0,
+	WAITFORT,
+	WAITFORP
+}si7005_state;
+
+static si7005_state state = RELAX;
+
+void si7005_setup(){
+	i2c_setup();
+	i2c_set_addr7(DEVID);
+}
+
+/*
+ * read device ID
+ */
+void si7005_read_ID(){
+	U8 ID;
+	i2c_status st = I2C_OK;
+	if(state != RELAX){
+		error_msg("measurements are in process");
+		return;
+	}
+	if((st = i2c_7bit_send_onebyte(0x11, 0)) == I2C_OK){
+		if((st = i2c_7bit_receive_onebyte(&ID,0)) == I2C_OK){
+			uart_write("got ID: ");
+			printUHEX(ID);
+			UART_send_byte('\n');
+		}
+	}
+	if(st != I2C_OK){
+		uart_write("can't read ID, errcode: ");
+		printUHEX(st); UART_send_byte('\n');
+	}
+}
+
+/*
+ * start themperature reading
+ */
+void si7005_read_T(){
+	const U8 cmd[2] = {0x03, 0x11};
+	i2c_status st = I2C_OK;
+	if(state != RELAX){
+		error_msg("measurements are in process");
+		return;
+	}
+	st = i2c_7bit_send(cmd, 2, 1);
+	if(st != I2C_OK){
+		error_msg("can't send read sequence, err: ");
+		printUHEX(st);UART_send_byte('\n');
+		return;
+	}
+	state = WAITFORT;
+}
+
+/*
+ * start pressure reading
+ */
+void si7005_read_P(){
+	const U8 cmd[2] = {0x03, 0x01};
+	i2c_status st = I2C_OK;
+	if(state != RELAX){
+		error_msg("measurements are in process");
+		return;
+	}
+	st = i2c_7bit_send(cmd, 2, 1);
+	if(st != I2C_OK){
+		error_msg("can't send read sequence, err: ");
+		printUHEX(st);UART_send_byte('\n');
+		return;
+	}
+	state = WAITFORP;
+}
+
+/*
+ * display readed value in tenths
+ */
+static void display_data(U8 *d){
+	U16 udata = *((int *)d);
+	long idata = 0L;
+	switch (state){
+		case WAITFORP: // display pressure
+			udata >>=4; // get 12 bit data
+			idata = (udata*10L)/16L - 240L;
+			uart_write("P*10=");
+		break;
+		case WAITFORT: // display themperature
+			udata >>=2; // get 14 bit data
+			idata = (udata*100L)/32L - 5000L;
+			uart_write("T*100=");
+		break;
+		default:
+			return;
+	}
+	print_long(idata);
+	UART_send_byte('\n');
+}
+
+/*
+ * process state machine
+ */
+void si7005_process(){
+	U8 T[2], b;
+	i2c_status st;
+	if(state == RELAX) return;
+	if(state == WAITFORP || state == WAITFORT){ // poll RDY
+		if((st = i2c_7bit_send_onebyte(0, 0)) == I2C_OK){
+			if(i2c_7bit_receive_onebyte(&b,0) == I2C_OK){
+				if(b) return; // !RDY
+				if((st = i2c_7bit_send_onebyte(1, 0)) == I2C_OK)
+					if((st = i2c_7bit_receive_twobyte(T,0)) == I2C_OK)
+						display_data(T);
+				state = RELAX;
+				if(st){
+					uart_write("can't read value, err: ");
+					printUHEX(st); UART_send_byte('\n');
+				}
+			}
+		}else{
+			error_msg("can't poll !RDY, err: ");
+			printUHEX(st); UART_send_byte('\n');
+			state = RELAX;
+		}
+	}
+}