MSPM0L1305: How to send I2C Target Address

Hi, Sourabh

Please refer to demo code from SDK:

C:\ti\mspm0_sdk_2_00_00_03\examples\nortos\LP_MSPM0L1306\driverlib\i2c_controller_rw_multibyte_fifo_poll

Here is the target address:

/* I2C Target address */
#define I2C_TARGET_ADDRESS (0x48)

Used here:

DL_I2C_startControllerTransfer(I2C_INST, I2C_TARGET_ADDRESS,
DL_I2C_CONTROLLER_DIRECTION_TX, I2C_TX_PACKET_SIZE);

Written to:

i2c->MASTER.MSA[10:1]

Sourabh Devarmani said:

1) To send target address do we need to write in MTXDATA register (Tx Buffer)?

Write I2C FIFO first. and then start transfer.

Sourabh Devarmani said:

If we write target address in MSA[SADDR] it will send automatically after setting MCTR[START] bit?

Yes. It is recommended to refer to API function [DL_I2C_startControllerTransfer] to configure the I2C startup code.

/**
 *  @brief      Sets up a transfer from I2C controller
 *
 *  Set target address, transfer direction, burst length, START+STOP generation.
 *  @note   Reading/writing data must be done separately.
 *
 *  @param[in]  i2c         Pointer to the register overlay for the peripheral
 *  @param[in]  targetAddr  Target address [0x00, 0x3FF]
 *  @param[in]  direction   One of @ref DL_I2C_CONTROLLER_DIRECTION
 *  @param[in]  length      Intended burst length in number of bytes
 */
__STATIC_INLINE void DL_I2C_startControllerTransfer(I2C_Regs *i2c,
    uint32_t targetAddr, DL_I2C_CONTROLLER_DIRECTION direction,
    uint16_t length)
{
    // Specify target address and read/write mode
    DL_Common_updateReg(&i2c->MASTER.MSA,
        ((targetAddr << I2C_MSA_SADDR_OFS) | (uint32_t) direction),
        (I2C_MSA_SADDR_MASK | I2C_MSA_DIR_MASK));

    // STOP bit is generated after burst length number of bytes transferred
    DL_Common_updateReg(&i2c->MASTER.MCTR,
        (((uint32_t) length << I2C_MCTR_MBLEN_OFS) | I2C_MCTR_BURSTRUN_ENABLE |
            I2C_MCTR_START_ENABLE | I2C_MCTR_STOP_ENABLE),
        (I2C_MCTR_MBLEN_MASK | I2C_MCTR_BURSTRUN_MASK | I2C_MCTR_START_MASK |
            I2C_MCTR_STOP_MASK));
}

------------------------------------

Please refer to demo code from SDK:

C:\ti\mspm0_sdk_2_00_00_03\examples\nortos\LP_MSPM0L1306\driverlib\i2c_controller_rw_multibyte_fifo_poll

Regards,

Helic