X-Git-Url: https://git.smho.de/gw/?p=owSlave2.git;a=blobdiff_plain;f=common%2FI2C%2FSHT3x.c;fp=common%2FI2C%2FSHT3x.c;h=b20de794ad0aeacd6521c031f14284c9c025e86e;hp=0000000000000000000000000000000000000000;hb=a07a7e7b05471927bf3046ee265792231711f8a4;hpb=286630139d0e6355ad62c7cbb0c9fe827cbb7fa7

diff --git a/common/I2C/SHT3x.c b/common/I2C/SHT3x.c
new file mode 100644
index 0000000..b20de79
--- /dev/null
+++ b/common/I2C/SHT3x.c
@@ -0,0 +1,71 @@
+//==============================================================================
+// S E N S I R I O N AG, Laubisruetistr. 50, CH-8712 Staefa, Switzerland
+//==============================================================================
+// Project : SHT2x Sample Code (V1.2)
+// File : SHT2x.c
+// Author : MST
+// Controller: NEC V850/SG3 (uPD70F3740)
+// Compiler : IAR compiler for V850 (3.50A)
+// Brief : Sensor layer. Functions for sensor access
+//==============================================================================
+//---------- Includes ----------------------------------------------------------
+#define F_CPU 8000000UL
+#include <avr/io.h>
+#include <util/delay.h>
+#include "USI_TWI_Master.h"
+#include "SHT3x.h"
+
+uint8_t initSHT3x(uint8_t adrline){
+	/*I2c_StartCondition();
+	I2c_WriteByte(0b10001000|(adrline<<1));
+	I2c_WriteByte(0x27);
+	I2c_WriteByte(0x37);
+	I2c_StopCondition();*/
+	return 1;
+}
+
+uint8_t calcCRCSHT3x(uint8_t b1, uint8_t b2) {
+	uint8_t bit;
+	uint8_t crc=0xFF;
+	crc^=b1;
+	for(bit=8;bit>0;--bit) {
+		if (crc&0x80) crc=(crc<<1)^  0x131;
+		else crc=(crc<<1);
+	}
+	crc^=b2;
+	for(bit=8;bit>0;--bit) {
+		if (crc&0x80) crc=(crc<<1)^  0x131;
+		else crc=(crc<<1);
+	}
+	return crc;
+	
+}
+
+
+
+uint8_t getSHT3xHumTemp(uint8_t adrline,double *temp,double *hum) {
+	uint8_t ret=1;
+	I2c_StartCondition();
+	I2c_WriteByte(0b10001000|(adrline<<1));
+	I2c_WriteByte(0x24);
+	I2c_WriteByte(0x00); //NotClock Scr
+	I2c_StopCondition();
+	_delay_ms(16);
+	
+	I2c_StartCondition();
+	I2c_WriteByte (0b10001001|(adrline<<1));
+	volatile uint8_t t1 =I2c_ReadByte(ACK);
+	volatile uint8_t t2 =I2c_ReadByte(ACK);
+	volatile uint8_t tc =I2c_ReadByte(ACK);
+	volatile uint8_t f1 =I2c_ReadByte(ACK);
+	volatile uint8_t f2 =I2c_ReadByte(ACK);
+	volatile uint8_t fc =I2c_ReadByte(NO_ACK);
+	I2c_StopCondition();
+	if (calcCRCSHT3x(t1,t2)==tc)
+		*temp=175.0f*(double)(((uint16_t)t1<<8)|t2)/65535.0f-45.0f;
+	else ret=0;
+	if (calcCRCSHT3x(f1,f2)==fc)
+		*hum=100.0f*(double)(((uint16_t)f1<<8)|f2)/65535.0f;
+	else ret=0;
+	return ret;
+}