今天夠郁悶的，下午寫了個中斷程序玩玩，一直到晚上8：00才把它搞定，原因是我沒有開啟IRQ中斷，實在是郁悶，好在解決了，且又學到東西，先把程序附下，我就沒怎么注釋啦，反正要記得在InitStacks.s中要把系統管理模式堆棧處的代碼改為“MSR CPSR_c, #0x5f”，即使能IRQ，否則永遠也實現不了。有什么問題可以在下面留言。
#include "config.h"
#define spi_shcp 0x00000010 //0.4
#define spi_stcp 0x00000100 //0.8
#define spi_q7 0x00000020 //0.5
#define spi_ds 0x00000040 //0.6
void delay(uint32 dly)
{ uint32 i;
for(; dly>0; dly--)
for(i=0; i<5000; i++);
}
void hc595send_data(uint8 data)
{
uint8 i;
IO0CLR = spi_stcp;
for(i=0;i<8;i++)
{
IO0CLR = spi_shcp;
if((data&0x80)!=0)IO0SET = spi_ds;
else IO0CLR = spi_ds;
data <<= 1;
IO0SET = spi_shcp;
}
IO0SET = spi_stcp;
}
const uint8 DISP_TAB[16] = { 0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,
0x81,0x42,0x24,0x18,0x24,0x42,0x81,0x00 };
void __irq IRQ_Eint1(void)
{
uint8 a;
for(a=0;a<16;a++)
{
hc595send_data(~DISP_TAB[a]);
delay(5);
}
EXTINT = 0x02; // 清除EINT1中斷標志
VICVectAddr = 0; // 向量中斷結束
}
int main (void)
{// add user source code
PINSEL0 = 0x20000000;
IO0DIR = 0x00000150;//0001 1/0 101 0000
EXTMODE = 0x00;
EXTPOLAR = 0x02;
VICIntSelect = 0x00000000;
VICVectCntl0 = 0x20|15;
VICVectAddr0 = (int)IRQ_Eint1;
EXTINT = 0x02;
VICIntEnable = 0x00008000;
while(1);
return 0;
}
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