Diff: features/unsupported/tests/peripherals/AT30TSE75X/AT30TSE75X.cpp

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/unsupported/tests/peripherals/AT30TSE75X/AT30TSE75X.cpp	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,73 @@
+#include "AT30TSE75X.h"
+
+AT30TSE75X::AT30TSE75X(PinName sda, PinName scl) : at30tse75x_i2c(sda, scl), resolution(AT30TSE_CONFIG_RES_9_bit) {
+    at30tse75x_i2c.frequency(10000);
+}
+AT30TSE75X::~AT30TSE75X() { }
+
+float AT30TSE75X::read_temp() {
+	uint8_t bufferwrite[1];
+	uint8_t buffer[2];
+	float temperature;
+	uint16_t data;
+	buffer[0] = 0;
+	buffer[1] = 0;
+
+	at30tse75x_i2c.read((AT30TSE_TEMPERATURE_TWI_ADDR << 1 ),(char *)buffer,AT30TSE_TEMPERATURE_REG_SIZE,false);
+
+
+	data = (buffer[0] << 8) | buffer[1];
+	int8_t sign = 1;
+
+	/* Check if negative and clear sign bit. */
+	if (data & (1 << 15)) {
+		sign *= -1;
+		data &= ~(1 << 15);
+	}
+
+	/* Convert to temperature. */
+	switch (this->resolution) {
+	case AT30TSE_CONFIG_RES_9_bit:
+		data = (data >> 7);
+		(temperature) = data * sign * 0.5;
+		break;
+
+	case AT30TSE_CONFIG_RES_10_bit:
+		data = (data >> 6);
+		(temperature) = data * sign * 0.25;
+		break;
+
+	case AT30TSE_CONFIG_RES_11_bit:
+		data = (data >> 5);
+		(temperature) = data * sign * 0.125;
+		break;
+
+	case AT30TSE_CONFIG_RES_12_bit:
+		data = (data >> 4);
+		(temperature) = data * sign * 0.0625;
+		break;
+
+	default:
+		break;
+	}
+	return temperature;
+}
+
+uint8_t AT30TSE75X:: read_eeprom(uint8_t *data, uint8_t length, uint8_t word_addr, uint8_t page) {	
+	uint8_t buff[20];
+	buff[0]  = (word_addr & 0x0F) | ((0x0F & page) << 4);
+		
+	at30tse75x_i2c.write((int)(AT30TSE_EEPROM_TWI_ADDR << 1),(char *)buff,1,false);
+	return at30tse75x_i2c.read((int)(AT30TSE_EEPROM_TWI_ADDR << 1),(char *)data,length,false);	
+}
+
+uint8_t AT30TSE75X:: write_eeprom(uint8_t *data, uint8_t length, uint8_t word_addr, uint8_t page)
+{
+	uint8_t buff[length+1];;
+	buff[0] = (word_addr & 0x0F) | ((0x0F & page) << 4);
+	for(int i = 0; i < length; i++)
+	{
+		buff[i+1] = *data++;
+	}
+	return 	at30tse75x_i2c.write((int)(AT30TSE_EEPROM_TWI_ADDR << 1),(char *)buff,(length + 1),false);
+}