TMS570LS1115: I2C interrupt not working

Hi,

If the TX interrupt is enabled, the interrupt will be generated even if length = 1. But the HAL generated code has a bug that the TX notification is not called if length=1.

You can modify the I2C ISR as:

Original code;

==================================

case 5U:
/* USER CODE BEGIN (42) */
/* USER CODE END */
/* transmit */

 if (g_i2cTransfer_t.length > 0U)
 {
    i2cREG1->DXR = *g_i2cTransfer_t.data;
    /*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
    g_i2cTransfer_t.data++;
    g_i2cTransfer_t.length--;
    if(g_i2cTransfer_t.length == 0U)
    { /* Disable TX interrupt after desired data count transfered*/
        i2cREG1->IMR &= (uint32)(~(uint32)I2C_TX_INT);
        i2cNotification(i2cREG1, (uint32)I2C_TX_INT);
    }
  }
   break;

=================================

Modified code;

==================================

case 5U:
/* USER CODE BEGIN (42) */
/* USER CODE END */
/* transmit */

 if (g_i2cTransfer_t.length > 0U)
 {
    i2cREG1->DXR = *g_i2cTransfer_t.data;
    /*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
    g_i2cTransfer_t.data++;
    g_i2cTransfer_t.length--;
  }

    if(g_i2cTransfer_t.length == 0U)
   { /* Disable TX interrupt after desired data count transfered*/
        i2cREG1->IMR &= (uint32)(~(uint32)I2C_TX_INT);
        i2cNotification(i2cREG1, (uint32)I2C_TX_INT);
    }
   break;

=================================

Hi,

Thank you very much for your quick reply. Actually, I tried your workaround but not working for me because the i2cInterrupt function is not calling by the microcontroller when length = 1. Everything is well when I change the length = 2. So I think the problem may be hardware related. Have you tried your solution? Is this workaround working in your setup?

The INT should be generated even if length=1

I2C_send(){

         ....

/* Length -1 since one data is written already */
g_i2cTransfer_t.length = (length - 1U);

/* Enable Transmit Interrupt */
i2c->IMR |= (uint32)I2C_TX_INT;

}

I will do a quick test

I got the interrupt:

I use the HAL example for my test. DATA_COUNT=1.