qt210 裸机ac97

此程序只能是ac97发出BBBBB的声音。。。欢迎牛人提供宝贵意见

#include "myprintf.h"#include "nand.h"#define GPC0CON(*(volatile unsigned long *)0xE0200060)#define VIC2VECTADDR19 (*(volatile unsigned long *)0xF220014C)#define VIC2INTENCLEAR  (*(volatile unsigned long *)0xE2200014)#define AC_GLBCTRL (*(volatile unsigned long *)0xE2200000)#define AC_CODEC_CMD (*(volatile unsigned long *)0xE2200008)#define AC_GLBSTAT(*(volatile unsigned long *)0xE2200004)#define VIC2INTENABLE(*(volatile unsigned long *)0xF2200010)#define AC_PCMDATA(*(volatile unsigned long *)0xE2200018)#define VIC2ADDR( *(volatile unsigned long *)0xF2200F00) #define VIC2INTSELECT            (*(volatile unsigned long *)0xf2200010)#define MUSIC_BUFF     0x32000000static  volatile unsigned long *p_music_data = (volatile unsigned long *)0x32000000;/* 编解码芯片就绪 */void mdelay(int i){int j;for(j=50000;j>0;j--)for(;i>0;i--);}void codec_read_irq(void){}/* 输出缓冲区已经没有数据了 */void pcm_out_underrun_irq(void){static int cnt = 0;int i;/* 清中断 */AC_GLBCTRL |= (1<<29);for (i = 0; i < 16; i++){ AC_PCMDATA=p_music_data[cnt++];}if (cnt > 150000){cnt = 0;}}/* 输出缓冲区的数据量已经降到阈值了 */void pcm_out_threshold_irq(void){}void ac97_controller_init(void){/* 配置GPIO引脚用于ac97 */GPC0CON &= ~(0xfffff);GPC0CON |= (4<<0)|(4<<4)|(4<<8)|(4<<12)|(4<<16);/* code reset */AC_GLBCTRL |= (1<<0);mdelay(1);AC_GLBCTRL &= ~(1<<0);/* warm reset */AC_GLBCTRL |= (3<<1);mdelay(1);AC_GLBCTRL &= ~(1<<1);mdelay(1);ac97_int_init();/* 设置AC97控制器 */AC_GLBCTRL &= ~((3<<12) | (3<<10) | (3<<8));AC_GLBCTRL |= ((1<<12) | (1<<10) | (1<<8));mdelay(1);AC_GLBCTRL |= (1<<3);  /* Transfer data enable using AC-link *//* read ac97 status */AC_CODEC_CMD |= (1<<23);if ( (AC_GLBSTAT & 3 ) == 3 )my_printf("ac97 has been active ...\n");elsemy_printf("ac97 init failed ...\n");}void ac97_irq(void){my_printf("ac97 irq:\n\r");pcm_out_underrun_irq();/* 清中断 */VIC2ADDR=0;}void ac97_int_init(void){VIC2VECTADDR19  = ac97_irq;}void ac97_int_enable(void){//AC_GLBCTRL |= ((1<<22) | (1<<21) | (1<<18));/* enable fifo empty interupt,  * at first, the fifo is empyt,  * so generate the interrupt, and then intr driver  */AC_GLBCTRL |=  (1<<21);  VIC2INTENABLE |= (1<<19); /* 使能INT_AC97 */ VIC2INTSELECT&=~(1<<19);}void ac97_int_disable(void){AC_GLBCTRL &= ~((1<<22) | (1<<21) | (1<<18));VIC2ADDR=0;VIC2INTENCLEAR |= (1<<19); }void ac97_write_cmd(unsigned char addr, unsigned short data){AC_CODEC_CMD = (addr << 16) | data;mdelay(1);}void wm9714_init(void){// set volume, sample rate, mux, enable power outputmy_printf("wm9714 init:\n\r");// left right DAC VOL controlac97_write_cmd(0x0c, 0);ac97_write_cmd(0x5c, 0);// enable variable rate audio controlac97_write_cmd(0x2a, 1);// set sample rate to 22050Hz//ac97_write_cmd(0x2c, 0x5622);ac97_write_cmd(0x2c, 0xBB80);  /* 48K *///  output mux select and speaker source ac97_write_cmd(0x1c,(1 << 12) | (1 << 9) | (1 << 7) | (1 << 5));// set headphone volumeac97_write_cmd(0x04, (0xf << 8) | (0xf));// set speaker volumeac97_write_cmd(0x02, (0x9 << 8) | (0x9));ac97_write_cmd(0x6,0);// enable powerac97_write_cmd(0x26, 0);ac97_write_cmd(0x3c, 0);ac97_write_cmd(0x3e, 3 << 9);// enable jake insertac97_write_cmd(0x24, (1 << 4)); }void ac97_init(){ac97_controller_init();wm9714_init();}void ac97_clear(void){int i;my_printf("ac97 clear data:");for (i = 0; i < 150000; i++){p_music_data[i] = 0;}}void ac97_test(void){unsigned char *buf = (unsigned char *)0x32000000;unsigned long len = 0;int have_begin = 0;int nodata_time = 0;unsigned char c;ac97_init();ac97_clear();ac97_int_enable();my_printf("press q to stop and exit\n\r");}