myinit.c

mcf5307开发板上进行iic接口实验

#include "mcf5307.h"

extern MCF5307_IMM *imm;

extern void InitMbus(void);

void SystemInit()
{
 
 imm= (MCF5307_IMM *)0x10000000;   

 InitMbus();
 
 imm->sim.AVCR=0xd4;                //enable ext. int. auto vect.
 imm->sim.IRQPAR=0xe0;              // ext. IRQ  5-3-1 mapped to IRQ   4/6/2
 
 imm->sim.IMR=(0x0000
                |MCF5307_SIM_IMR_DMA3
 	        |MCF5307_SIM_IMR_DMA2
 		|MCF5307_SIM_IMR_DMA1
 		|MCF5307_SIM_IMR_DMA0
 		|MCF5307_SIM_IMR_UART2
// 		|MCF5307_SIM_IMR_UART1       /*used, not be masked*/
// 		|MCF5307_SIM_IMR_MBUS        /*used, not be masked*/
 		|MCF5307_SIM_IMR_TIMER2
// 		|MCF5307_SIM_IMR_TIMER1	     /*used, not be masked*/
 		|MCF5307_SIM_IMR_SWT
 		|MCF5307_SIM_IMR_EINT7
 		|MCF5307_SIM_IMR_EINT6
 		|MCF5307_SIM_IMR_EINT5
 		|MCF5307_SIM_IMR_EINT4
 		|MCF5307_SIM_IMR_EINT3
 		|MCF5307_SIM_IMR_EINT2                  
 		|MCF5307_SIM_IMR_EINT1 
 	       );  
 		
 
 
 
 cpu_cache_disable();
 EnableCache();
 asm("		move.w		#0x2000,SR      ");
 
}