MSP432E401Y: Read and Write function for I2C

Hi,

  Which example are you referring to?

  If you are using non-RTOS bare-metal example such as the i2c_mastermode_simple_transfer_MSP_EXP432E401Y_nortos_ccs, then you would need to change all references from I2C1 to I2C2. You would also need to change the pinmuxing. See below snippet of code for pinmux configuration. Again, yuou will need to go through the entire example source code to change everywhere you see I2C1 to I2C2. 

FROM:

/* Enable clocks to GPIO Port G and configure pins as I2C */
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
while(!(MAP_SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOG)))
{
}

MAP_GPIOPinConfigure(GPIO_PG0_I2C1SCL);
MAP_GPIOPinConfigure(GPIO_PG1_I2C1SDA);
MAP_GPIOPinTypeI2C(GPIO_PORTG_BASE, GPIO_PIN_1);
MAP_GPIOPinTypeI2CSCL(GPIO_PORTG_BASE, GPIO_PIN_0);

/* Since there are no board pull up's we shall enable the weak internal
* pull up */
GPIOG->PUR |= (GPIO_PIN_1 | GPIO_PIN_0);

TO:

/* Enable clocks to GPIO Port N and configure pins as I2C */
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);
while(!(MAP_SysCtlPeripheralReady(SYSCTL_PERIPH_GPION)))
{
}

MAP_GPIOPinConfigure(GPIO_PN5_I2C2SCL);
MAP_GPIOPinConfigure(GPIO_PN4_I2C2SDA);
MAP_GPIOPinTypeI2C(GPIO_PORTN_BASE, GPIO_PIN_4);
MAP_GPIOPinTypeI2CSCL(GPIO_PORTN_BASE, GPIO_PIN_5);

/* Since there are no board pull up's we shall enable the weak internal
* pull up */
GPION->PUR |= (GPIO_PIN_5 | GPIO_PIN_4);

If you are using the SimpleLink SDK with TI-RTOS, then you can reference the i2ctmp_MSP_EXP432E401Y_tirtos_ccs example. This example uses I2C2 module already and the pinmux is configured using the Sysconfig tool.