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Dummy handler to receive the I2CSlaveAddr when don't match the IPMBAddr #215

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Mar 21, 2024
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Dummy handler to receive the I2CSlaveAddr when don't match the IPMBAddr #215

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16 changes: 16 additions & 0 deletions port/ucontroller/nxp/lpc17xx/lpc17_i2c.c
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,9 @@ void vI2CConfig( I2C_ID_T id, uint32_t speed )

static TaskHandle_t slave_task_id;
I2C_XFER_T slave_cfg;
I2C_XFER_T slave_dummy;
uint8_t recv_msg[i2cMAX_MSG_LENGTH];
uint8_t recv_msg_dummy[i2cMAX_MSG_LENGTH];
uint8_t recv_bytes;

uint8_t xI2CSlaveReceive( I2C_ID_T id, uint8_t * rx_buff, uint8_t buff_len, uint32_t timeout )
Expand Down Expand Up @@ -138,6 +140,13 @@ static void I2C_Slave_Event(I2C_ID_T id, I2C_EVENT_T event)
}
}

/*
* This stub functions is called when the received I2C Slave Address doesn't match the
* expected IPMB address. This seems to be necessary because the lpcopen library tries
* to handle the I2C Slave configuration for I2C_SLAVE_GENERAL even if it's not configured,
* thus dereferencing an invalid unitialized pointer generating a HardFault.
*/
static void I2C_Dummy_Event(I2C_ID_T id, I2C_EVENT_T event){}

void vI2CSlaveSetup ( I2C_ID_T id, uint8_t slave_addr )
{
Expand All @@ -149,6 +158,13 @@ void vI2CSlaveSetup ( I2C_ID_T id, uint8_t slave_addr )
slave_cfg.rxBuff = &recv_msg[0];
slave_cfg.rxSz = (sizeof(recv_msg)/sizeof(recv_msg[0]));
Chip_I2C_SlaveSetup( id, I2C_SLAVE_0, &slave_cfg, I2C_Slave_Event, SLAVE_MASK);

slave_dummy.slaveAddr = 0;
slave_dummy.txBuff = NULL;
slave_dummy.txSz = 0;
slave_dummy.rxBuff = recv_msg_dummy;
slave_dummy.rxSz =(sizeof(recv_msg_dummy)/sizeof(recv_msg_dummy[0]));
Chip_I2C_SlaveSetup( id, I2C_SLAVE_GENERAL, &slave_dummy, I2C_Dummy_Event, SLAVE_MASK);
}

int xI2CMasterWriteRead(I2C_ID_T id, uint8_t addr, const uint8_t *tx_buff, int tx_len, uint8_t *rx_buff, int rx_len)
Expand Down
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