Joel von Rotz / I2C-Master

A I2C-Dev like library which can be used with different kinds of sensors.

Used in:

i2c_master.cpp@0:0af6c7cf0ed3, 2019-07-11 (annotated)

Committer:
joelvonrotz
Date:
Thu Jul 11 09:35:55 2019 +0000
Revision:
0:0af6c7cf0ed3
I2C Master library;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
joelvonrotz 0:0af6c7cf0ed3 1 #include "mbed.h"
joelvonrotz 0:0af6c7cf0ed3 2 #include "i2c_master.h"
joelvonrotz 0:0af6c7cf0ed3 3
joelvonrotz 0:0af6c7cf0ed3 4 I2C_Master::I2C_Master(PinName sda, PinName scl, uint32_t frequency) :
joelvonrotz 0:0af6c7cf0ed3 5 m_i2c_sensor(sda, scl)
joelvonrotz 0:0af6c7cf0ed3 6 {
joelvonrotz 0:0af6c7cf0ed3 7
joelvonrotz 0:0af6c7cf0ed3 8 m_i2c_sensor.frequency(frequency);
joelvonrotz 0:0af6c7cf0ed3 9 }
joelvonrotz 0:0af6c7cf0ed3 10
joelvonrotz 0:0af6c7cf0ed3 11 void I2C_Master::i2c_write(uint8_t i2c_address, uint8_t slave_address, const uint8_t data)
joelvonrotz 0:0af6c7cf0ed3 12 {
joelvonrotz 0:0af6c7cf0ed3 13 char writeArray[2] = {slave_address, data};
joelvonrotz 0:0af6c7cf0ed3 14 m_i2c_sensor.write(i2c_address, writeArray, 2, false);
joelvonrotz 0:0af6c7cf0ed3 15 }
joelvonrotz 0:0af6c7cf0ed3 16
joelvonrotz 0:0af6c7cf0ed3 17 void I2C_Master::i2c_writeBits(uint8_t i2c_address, uint8_t slave_address, const uint8_t data, uint8_t mask)
joelvonrotz 0:0af6c7cf0ed3 18 {
joelvonrotz 0:0af6c7cf0ed3 19 char current_value;
joelvonrotz 0:0af6c7cf0ed3 20 char writeArray[2] = {slave_address, data};
joelvonrotz 0:0af6c7cf0ed3 21
joelvonrotz 0:0af6c7cf0ed3 22 //Get current value of desired register and mask it with mask-value
joelvonrotz 0:0af6c7cf0ed3 23 current_value = i2c_read(i2c_address, slave_address);
joelvonrotz 0:0af6c7cf0ed3 24 current_value &= ~mask;
joelvonrotz 0:0af6c7cf0ed3 25
joelvonrotz 0:0af6c7cf0ed3 26 //Combine Data with the new data (additionaly masking the data) and send it to the Sensor
joelvonrotz 0:0af6c7cf0ed3 27 writeArray[1] = current_value | (data & mask);
joelvonrotz 0:0af6c7cf0ed3 28
joelvonrotz 0:0af6c7cf0ed3 29 m_i2c_sensor.write(i2c_address, writeArray, 2, false);
joelvonrotz 0:0af6c7cf0ed3 30 }
joelvonrotz 0:0af6c7cf0ed3 31
joelvonrotz 0:0af6c7cf0ed3 32 void I2C_Master::i2c_readSeries(uint8_t i2c_address, uint8_t slave_address, uint8_t *data, uint8_t length)
joelvonrotz 0:0af6c7cf0ed3 33 {
joelvonrotz 0:0af6c7cf0ed3 34 char *data_array;
joelvonrotz 0:0af6c7cf0ed3 35 data_array = reinterpret_cast<char*>(data);
joelvonrotz 0:0af6c7cf0ed3 36
joelvonrotz 0:0af6c7cf0ed3 37 const char temp_address = slave_address;
joelvonrotz 0:0af6c7cf0ed3 38
joelvonrotz 0:0af6c7cf0ed3 39 m_i2c_sensor.write(i2c_address, &temp_address, 1, true);
joelvonrotz 0:0af6c7cf0ed3 40 m_i2c_sensor.read(i2c_address, data_array,length, false);
joelvonrotz 0:0af6c7cf0ed3 41 }
joelvonrotz 0:0af6c7cf0ed3 42
joelvonrotz 0:0af6c7cf0ed3 43 uint8_t I2C_Master::i2c_read(uint8_t i2c_address, uint8_t slave_address)
joelvonrotz 0:0af6c7cf0ed3 44 {
joelvonrotz 0:0af6c7cf0ed3 45 char data;
joelvonrotz 0:0af6c7cf0ed3 46 const char temp_address = slave_address;
joelvonrotz 0:0af6c7cf0ed3 47 m_i2c_sensor.write(i2c_address, &temp_address, 1, true);
joelvonrotz 0:0af6c7cf0ed3 48 m_i2c_sensor.read(i2c_address, &data, 1, false);
joelvonrotz 0:0af6c7cf0ed3 49 return data;
joelvonrotz 0:0af6c7cf0ed3 50 }
joelvonrotz 0:0af6c7cf0ed3 51
joelvonrotz 0:0af6c7cf0ed3 52 uint8_t I2C_Master::i2c_readBits(uint8_t i2c_address, uint8_t slave_address, uint8_t mask)
joelvonrotz 0:0af6c7cf0ed3 53 {
joelvonrotz 0:0af6c7cf0ed3 54 char data;
joelvonrotz 0:0af6c7cf0ed3 55 const char temp_address = slave_address;
joelvonrotz 0:0af6c7cf0ed3 56 m_i2c_sensor.write(i2c_address, &temp_address, 1, true);
joelvonrotz 0:0af6c7cf0ed3 57 m_i2c_sensor.read(i2c_address, &data, 1, false);
joelvonrotz 0:0af6c7cf0ed3 58 return data & mask;
joelvonrotz 0:0af6c7cf0ed3 59 }
joelvonrotz 0:0af6c7cf0ed3 60