systimer.h

str73系列 三洋LC75010 控制代码

					      
#include "73x_lib.h"
#include "def.h"	


void  SysTimerInit(void)
{
    CMU_InitTypeDef   CMU_InitStruct; 
	TB_InitTypeDef    TB_InitStructure;
	PRCCU_InitTypeDef    PRCCU_InitStructure;
	/* TB0 Clock Enable */
	

	CFG_PeripheralClockConfig(CFG_CLK_TB0 , DISABLE);
	CFG_PeripheralClockConfig(CFG_CLK_TB0 , ENABLE);
	/* EIC Configuration */
	EIC_IRQChannelConfig(TB0_IRQChannel, ENABLE );
	EIC_IRQChannelPriorityConfig(TB0_IRQChannel,1);

    CMU_InitStruct.CMU_CKSEL0 = CMU_CKSEL0_CKOSC;
    CMU_Init (&CMU_InitStruct);

	 PRCCU_InitStructure.PRCCU_DIV2 = ENABLE;
     PRCCU_InitStructure.PRCCU_MCLKSRC_SRC = PRCCU_MCLKSRC_PLL ; 
     PRCCU_InitStructure.PRCCU_PLLDIV = PRCCU_PLLDIV_2;
     PRCCU_InitStructure.PRCCU_PLLMUL = PRCCU_PLLMUL_16;
     PRCCU_InitStructure.PRCCU_FREEN = DISABLE; 
     PRCCU_Init(&PRCCU_InitStructure);

	TB_InitStructure.TB_CLK_Source = TB_CLK_INTERNAL  ;
	TB_InitStructure.TB_Prescaler =31;
	TB_InitStructure.TB_Preload =0xffff;
	TB_Init (TB0, &TB_InitStructure);
	
	TB_ITConfig (TB0,ENABLE);
	TB_Cmd(TB0, ENABLE);
	
	TsysCnt = 0xffff0000;
}

void SetUserTimer(uint32 *timer)
{
	uint32 temp;
	uint16 TBx_SR;
	EIC_IRQCmd(DISABLE);
	temp = TB0->CNT;
	*timer = TsysCnt + temp; //notice:  必须先计算完成才能开中断。
	TBx_SR = TB0->SR;
    EIC_IRQCmd(DISABLE);
	if (TBx_SR&0X01) 
	{
		if (temp > 0x8000) //4096 TB0 Ticks
			*timer -= 0x10000;
	}
}
uint32 ReadUserTimer(uint32 *timer)
{
	uint32 temp;
	uint32 currentT;
	uint16 TBx_SR;
	EIC_IRQCmd(DISABLE);
	temp = TB0->CNT;
	currentT = TsysCnt + temp; //notice:  必须先计算完成才能开中断。
	TBx_SR = TB0->SR;
	EIC_IRQCmd(ENABLE);
	if (TBx_SR&0X01) 
	{
		if (temp > 0x8000) //4096 TB0 Ticks
			currentT -= 0x10000;
	}
	return (*timer - currentT);


}