68k_sci.c

来自「uCOSII在motorala单片机上的移植」· C语言 代码 · 共 40 行

#include "68k_sci.h"
/*
**************************************************************************************************
* Discription:	
* Arguments:
* Returns:
* Notes:			frame format: 1 start bit + 8 data bits + 1 parity bit + 1 stop bit
**************************************************************************************************
*/
void initSCI(void)
{
	// CAUTION: initialize function use default value, which means that Fsys/128 is
	// used as baud clock rate.
	*QSM_SCCR0 = 0x0004;				// default value;
	//
	*QSM_SCCR1 &= BM_WOMS|BM_PE		// wired-or mode for TXD pin,even parity enabled; 
		|BM_M|BM_TIE				// 11-bit SCI frame, transmit interrupt enable;
		|BM_RIE|BM_TE				// receiver interrupt enable,transmitter enable;
		|BM_RE;						// receiver enable;
	
	return;
}
/*
**************************************************************************************************
* Discription:	
* Arguments:
* Returns:
* Notes:		Writing a value of zero disables the baud rate generator.	
**************************************************************************************************
*/
void setSCIBaudRate(INT16U scbr)
{
	scbr &= 0x1FFF;
	*QSM_SCCR0 = scbr;
	
	return;
}