Revision 0:0af6c7cf0ed3, committed 2019-07-11

Comitter:

joelvonrotz

Date:

Thu Jul 11 09:35:55 2019 +0000

Commit message:

I2C Master library;

Changed in this revision

diff -r 000000000000 -r 0af6c7cf0ed3 i2c_master.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2c_master.cpp	Thu Jul 11 09:35:55 2019 +0000
@@ -0,0 +1,60 @@
+#include "mbed.h"
+#include "i2c_master.h"
+
+I2C_Master::I2C_Master(PinName sda, PinName scl, uint32_t frequency) : 
+    m_i2c_sensor(sda, scl)
+{
+    
+    m_i2c_sensor.frequency(frequency);
+}
+
+void        I2C_Master::i2c_write(uint8_t i2c_address, uint8_t slave_address, const uint8_t data)
+{
+    char writeArray[2] = {slave_address, data};
+    m_i2c_sensor.write(i2c_address, writeArray, 2, false);
+}
+
+void        I2C_Master::i2c_writeBits(uint8_t i2c_address, uint8_t slave_address, const uint8_t data, uint8_t mask)
+{
+    char current_value;
+    char writeArray[2] = {slave_address, data};
+
+    //Get current value of desired register and mask it with mask-value
+    current_value = i2c_read(i2c_address, slave_address);
+    current_value &= ~mask;
+
+    //Combine Data with the new data (additionaly masking the data) and send it to the Sensor
+    writeArray[1] = current_value | (data & mask);
+
+    m_i2c_sensor.write(i2c_address, writeArray, 2, false);
+}
+
+void        I2C_Master::i2c_readSeries(uint8_t i2c_address, uint8_t slave_address, uint8_t *data, uint8_t length)
+{
+    char *data_array;
+    data_array = reinterpret_cast<char*>(data);
+
+    const char temp_address = slave_address;
+
+    m_i2c_sensor.write(i2c_address, &temp_address, 1, true);
+    m_i2c_sensor.read(i2c_address, data_array,length, false);
+}
+
+uint8_t     I2C_Master::i2c_read(uint8_t i2c_address, uint8_t slave_address)
+{
+    char data;
+    const char temp_address = slave_address;
+    m_i2c_sensor.write(i2c_address, &temp_address, 1, true);
+    m_i2c_sensor.read(i2c_address, &data, 1, false);
+    return data;
+}
+
+uint8_t     I2C_Master::i2c_readBits(uint8_t i2c_address, uint8_t slave_address, uint8_t mask)
+{
+    char data;
+    const char temp_address = slave_address;
+    m_i2c_sensor.write(i2c_address, &temp_address, 1, true);
+    m_i2c_sensor.read(i2c_address, &data, 1, false);
+    return data & mask;
+}
+

diff -r 000000000000 -r 0af6c7cf0ed3 i2c_master.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2c_master.h	Thu Jul 11 09:35:55 2019 +0000
@@ -0,0 +1,31 @@
+/**
+ * @file i2c.h
+ * @author Joel von Rotz (joel.vonrotz@maxonmotor.com)
+ * @brief 
+ * @version 0.1
+ * @date 2019-05-14
+ * 
+ * @copyright Copyright (c) 2019, maxon motor ag, All Rights Reserved
+ * 
+ */
+#ifndef _I2C_H
+#define _I2C_H
+#include "mbed.h"
+
+class I2C_Master
+{
+public:
+    I2C_Master(PinName sda, PinName scl, uint32_t frequency = 400000);
+    void        i2c_write(uint8_t i2c_address, uint8_t slave_address, const uint8_t data);
+    void        i2c_writeBits(uint8_t i2c_address, uint8_t slave_address, const uint8_t data, uint8_t mask);
+    uint8_t     i2c_readBits(uint8_t i2c_address, uint8_t slave_address, uint8_t mask);
+    void        i2c_readSeries(uint8_t i2c_address, uint8_t slave_address, uint8_t *data, uint8_t length);
+    uint8_t     i2c_read(uint8_t i2c_address, uint8_t slave_address);
+
+private:
+    I2C         m_i2c_sensor;
+    uint32_t    m_i2c_frequency;
+};
+
+#endif
+