NIOS的system.h解读--PIO实现的LED灯和key

#define LED_NAME "/dev/led" //设备名
#define LED_TYPE "altera_avalon_pio" //sopc对应的ip核
#define LED_BASE 0x010020c0 //基地址
#define LED_SPAN 16 //存储地址的总大小
#define LED_DO_TEST_BENCH_WIRING 0
#define LED_DRIVEN_SIM_VALUE 0
#define LED_HAS_TRI 0 //IO口为三态
#define LED_HAS_OUT 1 //IO口为输出
#define LED_HAS_IN 0 //IO口为输入
#define LED_CAPTURE 0 //无edge capture
#define LED_DATA_WIDTH 8 //数据宽度
#define LED_RESET_VALUE 0 //复位值
#define LED_EDGE_TYPE "NONE" //无edge capture 类型
#define LED_IRQ_TYPE "NONE" //无中断
#define LED_BIT_CLEARING_EDGE_REGISTER 0//无edge capture register清零
#define LED_FREQ 50000000 //时钟
#define ALT_MODULE_CLASS_led altera_avalon_pio

ine KEY_IN_NAME "/dev/key_in"
#define KEY_IN_TYPE "altera_avalon_pio"
#define KEY_IN_BASE 0x010020f0
#define KEY_IN_SPAN 16
#define KEY_IN_IRQ 4 //中断号
#define KEY_IN_DO_TEST_BENCH_WIRING 0
#define KEY_IN_DRIVEN_SIM_VALUE 0
#define KEY_IN_HAS_TRI 0
#define KEY_IN_HAS_OUT 0
#define KEY_IN_HAS_IN 1
#define KEY_IN_CAPTURE 1 //edge capture
#define KEY_IN_DATA_WIDTH 8
#define KEY_IN_RESET_VALUE 0
#define KEY_IN_EDGE_TYPE "FALLING" //edge capture 类型下降沿
#define KEY_IN_IRQ_TYPE "EDGE" //中断沿触发
#define KEY_IN_BIT_CLEARING_EDGE_REGISTER 0
#define KEY_IN_FREQ 50000000
#define ALT_MODULE_CLASS_key_in altera_avalon_pio