Hello,
I'm trying to write several bytes to the NHS3152 acting as I2C slave. Unfortunately, the I2C_EVENT_DONE is called already after the second byte.
I checked the example app_example_dp_i2c in the SDK v12.4 and saw that the RXEventHandler is now different to the previous version.
static void Slave_EventHandler(I2C_ID_T id, I2C_EVENT_T event)
{
ASSERT(id == I2C0);
(void)id; /* suppress [-Wunused-parameter]: only one value is possible, which is unused below. */
if (event == I2C_EVENT_SLAVE_RX) {
// LED_On(LED_ALL);
/* A byte has been received. The bytes sent by the master indicate in our application the offset from which
* to start reading.
*/
int offset = (int)((sRxBuffer[0] + ((unsigned int)sRxBuffer[1] << 8)) % sizeof(sText));
sXfer.txBuff = &sText[offset];
sXfer.txSz = (offset + I2C_SLAVE_TX_SIZE < (int)sizeof(sText)) ? I2C_SLAVE_TX_SIZE : ((int)sizeof(sText) - offset + 1);
}
Here it is stated that one byte is received, but sRxBuffer[0] and sRxBuffer[1], which are actually 2 bytes, are processed. So how do I know how many bytes have been received?
In the older versions of the SDK, the data reception is handled in the following function:
/**
* Helper function to handle slave data reception.
* @param slaveMem : Pointer to Slave memory being accessed.
* @param slaveMemOffset : Pointer to current Offset for the Slave Memory being accessed.
* @param slaveMemSize : Size of Slave Memory being accessed.
* @param slaveRxBuf : Pointer to Rx buffer where data is received.
*/
static void HandleSlaveRx(uint8_t* slaveMem, uint32_t* slaveMemOffset, uint32_t slaveMemSize, uint8_t* slaveRxBuf)
{
if (sSlaveRxIndex == 0) {
/* The first byte is the offset */
*slaveMemOffset = slaveRxBuf[sSlaveRxIndex++];
}
else if (*slaveMemOffset < slaveMemSize) {
/* Copy the received byte into the location specified by the offset */
slaveMem[(*slaveMemOffset)++] = slaveRxBuf[sSlaveRxIndex++];
}
if (*slaveMemOffset == slaveMemSize) {
*slaveMemOffset = 0;
}
}
Nevertheless, this function is only called twice before I2C_EVENT_DONE is received, no matter how many data I'm sending in the I2C write command.
I would be very thankful for any hints.
Many thanks in advance.
