/* **********************************************************************
* Function Name: WriteUART *
* Return Value: void *
* Parameters: data: byte to send out the UART *
* Description: This routine sends a byte out the TXD pin. *
* Special Note: The user must provide a routine: *
* DelayTXBit(): *
* DelayTXBit should have: *
* 8 Tcy for overhead *
* 2 Tcy call to DelayTXBit *
* ? Tcy *
* 2 Tcy for return from DelayTXBit *
* = (((2*OSC_FREQ)/(4*BAUDRATE))+1)/2 Tcy *
*********************************************************************** */
void putch__(unsigned char uartdata)
//void WriteUART (unsigned char uartdata)
{
unsigned char bitcount=8,data;
SW_TX=0;
DelayTXBitUART();
DelayTXBitUART();
DelayTXBitUART();
while (bitcount--)
{
//SW_TX=((uartdata>>=1) & 0x01);
data=(uartdata & 0x01);
uartdata>>=1;
if(!data)
SW_TX=0;
else
SW_TX=1;
DelayTXBitUART();
DelayTXBitUART();
DelayTXBitUART();
}
SW_TX=1;
DelayTXBitUART();
DelayTXBitUART();
DelayTXBitUART();
}
void putch(char c) {
unsigned char bitcount = 8;
//start
sGPIO.GP1 = 0; // falling edge means "start bit"
GPIO = sGPIO.port;
DelayTXBitUART();
while (bitcount--) {
sGPIO.GP1 = (c & 0x01);
GPIO = sGPIO.port;
DelayTXBitUART();
c>>=1;
}
//stop
sGPIO.GP1 = 1; // go back to "holding pattern of "high"
GPIO = sGPIO.port;
DelayTXBitUART();
}
