static void readDat(){
unsigned short accumulatedData = 0;
int i;
copyController(&prev_controller_state, controller_state);
IOWR_8DIRECT(controller_out, 0, 0x01);
IOWR_8DIRECT(controller_out, 0, 0x03);
alt_busy_sleep(12);
IOWR_8DIRECT(controller_out, 0, 0x01);
alt_busy_sleep(6);
accumulatedData = IORD_8DIRECT(controller_in, 0);
for (i = 0; i < 16; i++)
{
IOWR_8DIRECT(controller_out, 0, 0x00);
alt_busy_sleep(6);
accumulatedData <<= 1;
accumulatedData += IORD_8DIRECT(controller_in, 0);
IOWR_8DIRECT(controller_out, 0, 0x01); // Pulse clock
alt_busy_sleep(6);
}
IOWR_8DIRECT(leds, 0, accumulatedData);
copyController(&controller_state, getControllerButtons(accumulatedData));
}
/*
* Private function that polls write in progress bit EPCQ_RD_STATUS.
*
* Write in progress will be set if any of the following operations are in progress:
* -WRITE STATUS REGISTER
* -WRITE NONVOLATILE CONFIGURATION REGISTER
* -PROGRAM
* -ERASE
*
* Assumes EPCQ was configured correctly.
*
* If ALTERA_EPCQ_CONTROLLER_1US_TIMEOUT_VALUE is set, the function will time out after
* a period of time determined by that value.
*
* Arguments:
* - *epcq_flash_info: Pointer to EPCQ flash device structure.
*
* Returns:
* 0 -> success
* -EINVAL -> Invalid arguments
* -ETIME -> Time out and skipping the looping after 0.7 sec.
*/
alt_32 static alt_epcq_poll_for_write_in_progress(alt_epcq_controller_dev* epcq_flash_info)
{
/* we'll want to implement timeout if a timeout value is specified */
#if ALTERA_EPCQ_CONTROLLER_1US_TIMEOUT_VALUE > 0
alt_u32 timeout = ALTERA_EPCQ_CONTROLLER_1US_TIMEOUT_VALUE;
alt_u16 counter = 0;
#endif
/* return -EINVAL if epcq_flash_info is NULL */
if(NULL == epcq_flash_info)
{
return -EINVAL;
}
/* while Write in Progress bit is set, we wait */
while((IORD_ALTERA_EPCQ_CONTROLLER_STATUS(epcq_flash_info->csr_base) &
ALTERA_EPCQ_CONTROLLER_STATUS_WIP_MASK) ==
ALTERA_EPCQ_CONTROLLER_STATUS_WIP_BUSY)
{
alt_busy_sleep(1); /* delay 1us */
#if ALTERA_EPCQ_CONTROLLER_1US_TIMEOUT_VALUE > 0
if(timeout <= counter )
{
return -ETIME;
}
counter++;
#endif
}
return 0;
}
/********************************************************************
* 名 称：main()
* 功 能：等待按键中断，并输出控制相应的LED。
********************************************************************/
int main(void)
{
volatile alt_u32 key_state,old_state,new_state;
old_state = 0x00;
IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, old_state);//初始化LED全灭
InitPIO();
while(1)
{
if(0 != done)
{
/* 中断事件数量减1 */
done--;
alt_busy_sleep(5000); //延时5ms
key_state = IORD_ALTERA_AVALON_PIO_DATA(KEY_PIO_BASE)&KEYCON;
if(key_state == 0xff) //如果是由短暂脉冲引起的中断则忽略
continue;
new_state = ~(old_state ^ key_state); // 四个按键全部按下时LED取反
old_state = new_state; // 保存LED的状态
IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, new_state);
}
}
return(0);
}
unsigned int ALT_USLEEP (unsigned int us)
#endif
{
return alt_busy_sleep(us);
}
