mkw36a512xxx4 i2c Sequential Write

[yhu1992]

static bool I2C_WriteAccelReg(I2C_Type *base, uint8_t device_addr, uint8_t reg_addr, uint8_t value)
{
i2c_master_transfer_t masterXfer;
memset(&masterXfer, 0, sizeof(masterXfer));

masterXfer.slaveAddress = device_addr;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = reg_addr;
masterXfer.subaddressSize = 1;
masterXfer.data = &value;
masterXfer.dataSize = 1;
masterXfer.flags = kI2C_TransferDefaultFlag;

/* direction=write : start+device_write;cmdbuff;xBuff; */
/* direction=recive : start+device_write;cmdbuff;repeatStart+device_read;xBuff; */

I2C_MasterTransferNonBlocking(BOARD_ACCEL_I2C_BASEADDR, &g_m_handle, &masterXfer);

/* wait for transfer completed. */
while ((!nakFlag) && (!completionFlag))
{
}

nakFlag = false;

if (completionFlag == true)
{
completionFlag = false;
return true;
}
else
{
return false;
}
}

## I want to transfer 8byte data. but there are just only 1byte. how can put in 8byte data ?

plz help

## masterXferdata is uint8_t

[Sebastian_Del_Rio · Accepted solution]

Hi @yhu1992, I hope you're doing well!

You can change the number of bytes sent in a transfer by changing the size element of the masterXfer structure to the desired amount of bytes:

i2c_master_transfer_t masterXfer;
memset(&masterXfer, 0, sizeof(masterXfer));

masterXfer.slaveAddress = device_addr;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = reg_addr;
masterXfer.subaddressSize = 1;
masterXfer.data = &value;
masterXfer.dataSize = 8;             // change this value
masterXfer.flags = kI2C_TransferDefaultFlag;

masterXfer.data is a pointer to the starting address of the data which will be sent, so it can be assigned to an array of uint8_t.

Please let me know if you need any more information.

Best regards,

Sebastian