예제 #1
0
void CI2C1_Interrupt(LDD_RTOS_TISRParameter _isrParameter)
{
  /* {MQXLite RTOS Adapter} ISR parameter is passed as parameter from RTOS interrupt dispatcher */
  CI2C1_TDeviceDataPtr DeviceDataPrv = (CI2C1_TDeviceDataPtr)_isrParameter;
  register uint8_t Status;             /* Temporary variable for status register */

  Status = I2C_PDD_ReadStatusReg(I2C0_BASE_PTR); /* Safe status register */
  I2C_PDD_ClearInterruptFlags(I2C0_BASE_PTR, (Status)); /* Clear interrupt flag */
  if (I2C_PDD_GetMasterMode(I2C0_BASE_PTR) == I2C_PDD_MASTER_MODE) { /* Is device in master mode? */
    if (I2C_PDD_GetTransmitMode(I2C0_BASE_PTR) == I2C_PDD_TX_DIRECTION) { /* Is device in Tx mode? */
      if ((Status & I2C_PDD_RX_ACKNOWLEDGE) != 0x00U){ /* NACK received? */
        I2C_PDD_SetMasterMode(I2C0_BASE_PTR, I2C_PDD_SLAVE_MODE); /* Switch device to slave mode (stop signal sent) */
        I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
        DeviceDataPrv->OutLenM = 0x00U; /* No character for sending */
        DeviceDataPrv->InpLenM = 0x00U; /* No character for reception */
        DeviceDataPrv->SerFlag &= (uint8_t)~(MASTER_IN_PROGRES); /* No character for sending or reception */
      } else {
        if (DeviceDataPrv->OutLenM != 0x00U) { /* Is any char. for transmitting? */
          DeviceDataPrv->OutLenM--;    /* Decrease number of chars for the transmit */
          I2C_PDD_WriteDataReg(I2C0_BASE_PTR, *(DeviceDataPrv->OutPtrM)++); /* Send character */
        } else {
          if (DeviceDataPrv->InpLenM != 0x00U) { /* Is any char. for reception? */
            if (DeviceDataPrv->InpLenM == 0x01U) { /* If only one char to receive */
              I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_DISABLE); /* then transmit ACK disable */
            } else {
              I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_ENABLE); /* else transmit ACK enable */
            }
            I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
            (void)I2C_PDD_ReadDataReg(I2C0_BASE_PTR); /* Dummy read character */
          } else {
            DeviceDataPrv->SerFlag &= (uint8_t)~(MASTER_IN_PROGRES); /* Clear flag "busy" */
            if (DeviceDataPrv->SendStop == LDD_I2C_SEND_STOP) {
              I2C_PDD_SetMasterMode(I2C0_BASE_PTR, I2C_PDD_SLAVE_MODE); /* Switch device to slave mode (stop signal sent) */
              I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
            }
            CI2C1_OnMasterBlockSent(DeviceDataPrv->UserData); /* Invoke OnMasterBlockSent event */
          }
        }
      }
    } else {
      DeviceDataPrv->InpLenM--;        /* Decrease number of chars for the receive */
      if (DeviceDataPrv->InpLenM != 0x00U) { /* Is any char. for reception? */
        if (DeviceDataPrv->InpLenM == 0x01U) {
          I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_DISABLE); /* Transmit NACK */
        }
      } else {
        DeviceDataPrv->SerFlag &= (uint8_t)~(MASTER_IN_PROGRES); /* Clear flag "busy" */
        I2C_PDD_SetMasterMode(I2C0_BASE_PTR, I2C_PDD_SLAVE_MODE); /* If no, switch device to slave mode (stop signal sent) */
        I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_ENABLE); /* Transmit ACK */
      }
      *(DeviceDataPrv->InpPtrM)++ = I2C_PDD_ReadDataReg(I2C0_BASE_PTR); /* Receive character */
      if (DeviceDataPrv->InpLenM == 0x00U) { /* Is any char. for reception? */
        CI2C1_OnMasterBlockReceived(DeviceDataPrv->UserData); /* Invoke OnMasterBlockReceived event */
      }
    }
  } else {
    if ((Status & I2C_PDD_ARBIT_LOST) != 0x00U) { /* Arbitration lost? */
      DeviceDataPrv->OutLenM = 0x00U;  /* Any character is not for sent */
      DeviceDataPrv->InpLenM = 0x00U;  /* Any character is not for reception */
      DeviceDataPrv->SendStop = LDD_I2C_SEND_STOP; /* Set variable for sending stop condition (for master mode) */
      DeviceDataPrv->SerFlag &= (uint8_t)~(MASTER_IN_PROGRES); /* Any character is not for sent or reception*/
      I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
    }
  }
}
예제 #2
0
void i2c_interrupt_process (i2c_buf_t *buf) { 
	/*
	 * this is the i2c interrupt handler, will be called from a wrapper function, 
	 * processor failexpert recommended using register for status, not sure if
	 * necessary. assuming device is always in master mode.
	 */
	
	uint8_t status = I2C_S_REG(I2C0_BASE_PTR);
	uint8_t errormask = 0x00;
	
	// clear interrupt flag
	I2C_S_REG(I2C0_BASE_PTR) = (uint_8)(status | ((I2C_S_IICIF_MASK & I2C_S_ARBL_MASK) & I2C_S_REG(I2C0_BASE_PTR)));
	
	if (I2C_PDD_GetMasterMode(I2C0_BASE_PTR) == I2C_PDD_MASTER_MODE) { /* Is device in master mode? */
    if (I2C_PDD_GetTransmitMode(I2C0_BASE_PTR) == I2C_PDD_TX_DIRECTION) { /* Is device in Tx mode? */
      if ((status & I2C_PDD_RX_ACKNOWLEDGE) != 0x00U){ /* NACK received? */
				
        I2C_PDD_SetMasterMode(I2C0_BASE_PTR, I2C_PDD_SLAVE_MODE); /* Switch device to slave mode (stop signal sent) */
        I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
				
        buf->tx_req = 0x00U; /* No character for sending */
        buf->rx_req = 0x00U; /* No character for reception */
        buf->flags &= ~(MASTER_IN_PROGRES); /* No character for sending or reception */
        buf->flags |= (ADDR_COMPLETE | REP_ADDR_COMPLETE); /* Set the flag */
        errormask |= LDD_I2C_MASTER_NACK; /* Set the Master Nack error mask */
      } 
			else {
        if ((buf->flags & ADDR_COMPLETE) != 0x00U) { /* If 10-bit addr has been completed */
          if (buf->tx_req != 0x00U) { /* Is any char. for transmitting? */
            buf->tx_req--;  /* Decrease number of chars for the transmit */
						
            I2C_PDD_WriteDataReg(I2C0_BASE_PTR, buf->tx_buf[buf->tx_idx++]); /* Send character */
						
          }
          else {
            if (buf->rx_req != 0x00U) { /* Is any char. for reception? */
              if ((buf->flags & REP_ADDR_COMPLETE) != 0x00U) { /* If repeated start and addr tx has been completed for 10-bit mode ?*/
                if (buf->rx_req == 0x01U) { /* If only one char to receive */
									
                  I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_DISABLE); /* then transmit ACK disable */
									
                } 
								else {
									
                  I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_ENABLE); /* else transmit ACK enable */
									
                }
								
                I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
                (void)I2C_PDD_ReadDataReg(I2C0_BASE_PTR); /* Dummy read character */
								
              } 
							else {                 /* Repeated address has not been completed for 10-bit addressing mode */
								
                I2C_PDD_RepeatStart(I2C0_BASE_PTR); /* Repeat start cycle generated */
								I2C_PDD_WriteDataReg(I2C0_BASE_PTR, (uint8_t)(buf->slave_addr_high | 0x01U)); /* Send slave address high byte*/
								
								buf->flags |= REP_ADDR_COMPLETE;
              }
            }
            else {
              buf->flags &= ~(MASTER_IN_PROGRES); /* Clear flag "busy" */
              if (buf->sendstop == TRUE) {
								
                I2C_PDD_SetMasterMode(I2C0_BASE_PTR, I2C_PDD_SLAVE_MODE); /* Switch device to slave mode (stop signal sent) */
                I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
								
              }
            }
          }
        } else {
          
					I2C_PDD_WriteDataReg(I2C0_BASE_PTR, buf->slave_addr_low); /* Send second part of the 10-bit addres */
										
          buf->flags |= (ADDR_COMPLETE); /* Address complete */
        }
      }
    }
    else {
      buf->rx_req--;        /* Decrease number of chars for the receive */
      if (buf->rx_req != 0x00U) { /* Is any char. for reception? */
        if (buf->rx_req == 0x01U) {
					
          I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_DISABLE); /* Transmit NACK */
					
        }
      } else {
        buf->flags &= ~(MASTER_IN_PROGRES); /* Clear flag "busy" */
				
        I2C_PDD_SetMasterMode(I2C0_BASE_PTR, I2C_PDD_SLAVE_MODE); /* If no, switch device to slave mode (stop signal sent) */
        I2C_PDD_EnableTransmitAcknowledge(I2C0_BASE_PTR, PDD_ENABLE); /* Transmit ACK */
				
      }
      buf->rx_buf[buf->rx_idx++] = I2C_PDD_ReadDataReg(I2C0_BASE_PTR); /* Receive character */
    }
  } else {
    if ((status & I2C_PDD_ARBIT_LOST) != 0x00U) { /* Arbitration lost? */
      buf->tx_req = 0x00U;  /* Any character is not for sent */
      buf->rx_req = 0x00U;  /* Any character is not for reception */
      buf->sendstop = TRUE; /* Set variable for sending stop condition (for master mode) */
      buf->flags &= ~(MASTER_IN_PROGRES); /* Any character is not for sent or reception*/
			
      I2C_PDD_SetTransmitMode(I2C0_BASE_PTR, I2C_PDD_RX_DIRECTION); /* Switch to Rx mode */
			
      errormask |= LDD_I2C_ARBIT_LOST; /* Set the ArbitLost error mask */
    }
  }
  if (errormask != 0x00) {            /* Is any error mask set? */
    buf->errors |= errormask; /* Update list of error mask value */
    // maybe do something here to handle error?
  }	
}