/******************************************************************************* * Function Name: UART_1_UartGetByte ******************************************************************************** * * Summary: * Retrieves the next data element from the receive buffer, returns the * received byte and error condition. * - The RX software buffer is disabled: returns the data element retrieved * from the RX FIFO. Undefined data will be returned if the RX FIFO is * empty. * - The RX software buffer is enabled: returns data element from the * software receive buffer. * * Parameters: * None * * Return: * Bits 7-0 contain the next data element from the receive buffer and * other bits contain the error condition. * * Side Effects: * The errors bits may not correspond with reading characters due to RX FIFO * and software buffer usage. * RX software buffer is disabled: The internal software buffer overflow * is not returned as status by this function. * Check SCB_rxBufferOverflow to capture that error condition. * *******************************************************************************/ uint32 UART_1_UartGetByte(void) { uint32 rxData; uint32 tmpStatus; #if (UART_1_CHECK_RX_SW_BUFFER) { UART_1_DisableInt(); } #endif if (0u != UART_1_SpiUartGetRxBufferSize()) { /* Enables interrupt to receive more bytes: at least one byte is in * buffer. */ #if (UART_1_CHECK_RX_SW_BUFFER) { UART_1_EnableInt(); } #endif /* Get received byte */ rxData = UART_1_SpiUartReadRxData(); } else { /* Reads a byte directly from RX FIFO: underflow is raised in the case * of empty. Otherwise the first received byte will be read. */ rxData = UART_1_RX_FIFO_RD_REG; /* Enables interrupt to receive more bytes. * The RX_NOT_EMPTY interrupt is cleared by the interrupt routine * in case the byte was received and read by code above. */ #if (UART_1_CHECK_RX_SW_BUFFER) { UART_1_EnableInt(); } #endif } /* Get and clear RX error mask */ tmpStatus = (UART_1_GetRxInterruptSource() & UART_1_INTR_RX_ERR); UART_1_ClearRxInterruptSource(UART_1_INTR_RX_ERR); /* Puts together data and error status: * MP mode and accept address: 9th bit is set to notify mark. */ rxData |= ((uint32) (tmpStatus << 8u)); return (rxData); }
/******************************************************************************* * Function Name: UART_1_UartGetByte ******************************************************************************** * * Summary: * Retrieves the next data element from the receive buffer, returns the received byte * and error condition. * - The RX software buffer is disabled: returns the data element retrieved from the RX FIFO. * Undefined data will be returned if the RX FIFO is empty. * - The RX software buffer is enabled: returns data element from the software receive * buffer. * * Parameters: * None * * Return: * Bits 15-8 contains status and bits 7-0 contains the next data element from * receive buffer. If the bits 15-8 are non-zero, an error has occurred. * *******************************************************************************/ uint32 UART_1_UartGetByte(void) { uint32 rxData; uint32 tmpStatus; uint32 intSourceMask; intSourceMask = UART_1_SpiUartDisableIntRx(); if(0u != UART_1_SpiUartGetRxBufferSize()) { /* * Enable interrupt to receive more bytes: at least one byte is in * buffer. */ UART_1_SpiUartEnableIntRx(intSourceMask); /* Get received byte */ rxData = UART_1_SpiUartReadRxData(); } else { /* * Read byte directly from RX FIFO: the underflow is raised in case * of empty. In other case the first received byte will be read. */ rxData = UART_1_RX_FIFO_RD_REG; /* * Enable interrupt to receive more bytes. * The RX_NOT_EMPTY interrupt is cleared by the interrupt routine in case * the byte was received and read above. */ UART_1_SpiUartEnableIntRx(intSourceMask); } /* Get and clear RX error mask */ tmpStatus = (UART_1_GetRxInterruptSource() & UART_1_INTR_RX_ERR); UART_1_ClearRxInterruptSource(UART_1_INTR_RX_ERR); /* * Put together data and error status: * MP mode and accept address: the 9th bit is set to notify mark. */ rxData |= ((uint32) (tmpStatus << 8u)); return(rxData); }