This PlatformIO project contains two programs that enable I2C communication between an MSP430 and another I2C capable µcontroller as a master.
The I2C communication is realized with the USI (Universal Serial Interface) module, which is used on the MSP430X20XX models. The MSP430 software was created with the MSP430 framework from PlatformIO. The Arduino framework was used for the software of the I2C master. The software can e.g. serve as an I2C to serial gateway to display measured (register) values from the MSP430 controller on a serial console.
This directory contains an example program for an I2C master software that can run on all I2C capable µcontrollers that can be programmed with the help of the Arduino framework. Depending on the value of the constant NUMBER_OF_BYTES, the program requests 2 (16 integer) or 4 bytes (32 bit integer) data from the slave. The slave address can be specified in the file lib/bufferToint/bufferToint.h by adjusting the constant I2C_SLAVE_ADDRESS accordingly.
The sample program continuously reads measured values from the SD16_a (ADC). Eleven measured values are read in and saved. The meridian is determined from this and sent to the master. The I2C implementation is located in the lib/msp430-i2c/ directory. There is a constant SLAVE_ADDR in the msp430-i2c.h file. The slave address is specified here and can of course be changed.
In order to save some memory space, the definition WITH_LED can be commented out. This deactivates the status LED functionality on PIN 1.0.
