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#include <stdlib.h>
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#include <io.h>
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#include "sys/alt_irq.h"
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#include "altera_avalon_pio_regs.h"
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#include "system.h"
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#ifdef PIO_BUTTON_BASE
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/* 按键中断服务程序*/
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static void handle_button_interrupts(void* context, alt_u32 id)
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{
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/* Cast context to edge_capture's type. It is important that this be
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* declared volatile to avoid unwanted compiler optimization.
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*/
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volatile int* edge_capture_ptr = (volatile int*) context;
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/* Store the value in the Button's edge capture register in *context. */
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*edge_capture_ptr = IORD_ALTERA_AVALON_PIO_EDGE_CAP(PIO_BUTTON_BASE);
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/* Reset the Button's edge capture register. */
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IOWR_ALTERA_AVALON_PIO_EDGE_CAP(PIO_BUTTON_BASE,0x00);
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}
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/* 按键IO初始化 */
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static void init_button_pio()
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{
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/* Recast the edge_capture pointer to match the alt_irq_register() function
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* prototype. */
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void* edge_capture_ptr = (void*) &edge_capture;
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/* Enable all 4 button interrupts. */
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IOWR_ALTERA_AVALON_PIO_IRQ_MASK(PIO_BUTTON_BASE, 0xff);
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/* Reset the edge capture register. */
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IOWR_ALTERA_AVALON_PIO_EDGE_CAP(PIO_BUTTON_BASE, 0x00);
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/* Register the interrupt handler. */
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alt_irq_register(PIO_BUTTON_IRQ, edge_capture_ptr,
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handle_button_interrupts );
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}
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#endif
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void delay(int i)
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{
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int j;
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for(j=0;j<i;j++);
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}
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int main (void) __attribute__ ((weak, alias ("alt_main")));
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int alt_main(void)
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{
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alt_irq_init(ALT_IRQ_BASE); //使能中断
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init_button_pio();
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while(1)
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{
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switch(edge_capture)
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{
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case 0x01:
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{
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led=led^0x01;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x02:
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{
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led=led~0x02;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x04:
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{
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led=led^0x04;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x08:
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{
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led=led^0x08;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x10:
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{
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led=led^0x10;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x20:
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{
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led=led^0x20;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x40:
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{
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led=led^0x40;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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case 0x80:
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{
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led=led^0x80;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,led);
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break;
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}
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default:
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{
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE,0x00);
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edge_capture=0;
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break;
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}
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}
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}
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return 0;
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}
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注意,在添加按键PIO时一定要使能中断!
研究过一段时间的Nios II,感觉还是很有收获,深刻体会到了SOPC技术的灵活性,但目前速度方面是其最大的缺点,相信Nios II会慢慢流行起来....