testing temperature function

htu21d.c

@@ -6,16 +6,39 @@
 
 #include "htu21d.h"
 
-// Reset function
+// i2cReset
 int i2cReset(int fd){
 	if(ioctl(fd, I2C_SLAVE, ADDR)<0){
-		perror("Failed to open the I2C bus; reset\n");
+		perror("Failed to open the I2C bus: reset\n");
 		return -1;
 	}
 	i2c_smbus_write_byte(fd, RESET);
 	return 0;
 }
 
-// temperature
+// get temp
+int getTemp(int fd, double *temp){
+	char buffer[3];
+	int response = i2c_smbus_read_i2c_block_data(fd, TEMP,3,buffer);
+	if(response<0){
+		perror("Failed to read temperature from sensor\n");
+		return -1;
+	}
+	*temp = -46.85+175.72*(buffer[0]*256+buffer[1])/65536;
+	return 0;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
 
-// humidity
+// get humidity

main.c

@@ -8,14 +8,20 @@
 int main(int argc, char *argv[]){
 	int fd;
 	char path[20];
-	snprintf(path, sizeof(path), "/dev/i2c-%d", 1); // 1 is the number of I2C bus
+	snprintf(path, sizeof(path), "/dev/i2c-%d", 1);
 	fd = open(path, O_RDWR);
 	if(fd<0){
-		perror("Unable to access I2C bus path\n");
+		//printf("Error");
+		perror("Unable to access the i2c bus path\n");
 		return -1;
 	}
-	i2cReset(fd); 
+	i2cReset(fd);
+	double temperature;
+	int status = getTemp(fd, &temperature);
+	if(status<0){
+		perror("Unable to get temperature\n");
+		return -1;
+	}
+	printf("%5.2f C\n", temperature);
 	return 0;
 }
-
-