Diff: Sensors/I2C_Sensor.cpp

Revision:

14:cf260677ecde

Child:

15:753c5d6a63b3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Sensors/I2C_Sensor.cpp	Sat Oct 27 10:53:43 2012 +0000
@@ -0,0 +1,41 @@
+#include "mbed.h"
+#include "I2C_Sensor.h"
+
+// calculate the 8-Bit write/read I2C-Address from the 7-Bit adress of the device
+#define GET_I2C_WRITE_ADDRESS(ADR)  (ADR << 1&0xFE) // ADR & 1111 1110
+#define GET_I2C_READ_ADDRESS(ADR)   (ADR << 1|0x01) // ADR | 0000 0001
+
+I2C_Sensor::I2C_Sensor(PinName sda, PinName scl, int8_t i2c_address) :  i2c(sda, scl), local("local")
+{
+    I2C_Sensor::i2c_address = i2c_address;
+    //i2c.frequency(400000); // standard speed
+    i2c.frequency(1500000); // ultrafast!
+}
+
+void saveCalibrationValues(float values[], int size, char * filename)
+{
+    FILE *fp = fopen(strcat("/local/", filename), "w");
+    for(int i = 0; i < size; i++)
+        fprintf(fp, "%f\r\n", values[i]);
+    fclose(fp);
+}
+
+void loadCalibrationValues(float values[], int size, char * filename)
+{
+    FILE *fp = fopen(strcat("/local/", filename), "r");
+    for(int i = 0; i < size; i++)
+        fscanf(fp, "%f", &values[i]);
+    fclose(fp);
+}
+
+void I2C_Sensor::writeRegister(char address, char data){ 
+    char tx[2];
+    tx[0] = address;
+    tx[1] = data;
+    i2c.write(GET_I2C_WRITE_ADDRESS(i2c_address), tx, 2);
+}
+
+void I2C_Sensor::readMultiRegister(char address, char* output, int size) {
+    i2c.write (GET_I2C_WRITE_ADDRESS(i2c_address), &address, 1);      //tell it from which register to read
+    i2c.read  (GET_I2C_READ_ADDRESS(i2c_address), output, size);      //tell it where to store the data read
+}
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