Programming Embedded Systems by By

Author:By
Language: eng
Format: epub
ISBN: 0-596-00983-6
Publisher: O'Reilly
Published: 2011-10-03T16:06:10.098790+00:00

The serial device driver API function serialGetChar waits until a character is received and then reads the character from the serial port. To determine whether a character has been received, the data ready bit is checked in the UART status register. The character received is returned to the calling function. Here is the serialGetChar function:

#define DATA_READY (0x01) /********************************************************************** * * Function: serialGetChar * * Description: Get a character from the serial port. * * Notes: This function is specific to the Arcom board. * * Returns: The character received from the serial port. * **********************************************************************/ char serialGetChar(void) { /* Wait for the next character to arrive. */ while ((pSerialPort->uartStatus & DATA_READY) == 0) ; return pSerialPort->data; }

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