d12drv.h

USB audio card 音效卡設計原理圖,說明及源碼

#define COMMAND *(volatile unsigned char *)(0xFF21)   
#define DATA  *(volatile unsigned char *)(0xFF20)


#define USB_FRQ 0x45       //8MHZ

#define SUS 0x80
#define BUS_RST 0x40
#define MAIN_IN 0x20
#define MAIN_OUT 0x10
#define EP1_IN 0x08
#define EP1_OUT 0x04
#define EP0_IN 0x02
#define EP0_OUT 0x01


void d12_init(void);
void out_cmd(unsigned char data);
void out_data(unsigned char data);
unsigned char in_data();
void delay_time(unsigned short number);