TI中文支持网Ki开发板用的是TMS320C5517
这是一段1KHz的正弦波音频信号，播放的时候声音太大，怎么调节音量大小，可不可以不减小幅值在程序里调。Gi有个问题就是C5517有两片AIC3204，可不可以在两个模块同时播放同一段声音#include"stdio.h"#include "evm5517.h"externInt16 AIC3204_rset( Uint16 regnum, Uint16 regval);#define Xmit 0x20/* * * aic3204_tone_headphone( ) * Output a 1 kHz tone through the STEREO OUT jack * */Int16 aic3204_tone_headphone( ){ /* Pre-generated sine wave data, 16-bit signed samples */ Int16 sinetable[48] = { 0x0000, 0x10b4, 0x2120, 0x30fb, 0x3fff, 0x4dea, 0x5a81, 0x658b, 0x6ed8, 0x763f, 0x7ba1, 0x7ee5, 0x7ffd, 0x7ee5, 0x7ba1, 0x76ef, 0x6ed8, 0x658b, 0x5a81, 0x4dea, 0x3fff, 0x30fb, 0x2120, 0x10b4, 0x0000, 0xef4c, 0xdee0, 0xcf06, 0xc002, 0xb216, 0xa57f, 0x9a75, 0x9128, 0x89c1, 0x845f, 0x811b, 0x8002, 0x811b, 0x845f, 0x89c1, 0x9128, 0x9a76, 0xa57f, 0xb216, 0xc002, 0xcf06, 0xdee0, 0xef4c }; Int16 j, i = 0; Int16 sample; /* Configure AIC3204 */ AIC3204_rset( 0, 0x00 ); // Select page 0 AIC3204_rset( 1, 0x01 ); // Reset codec AIC3204_rset( 0, 0x01 ); // Point to page 1 AIC3204_rset( 1, 0x08 ); // Disable crude AVDD generation from DVDD AIC3204_rset( 2, 0x00 ); // Enable Analog Blocks /* PLL and Clocks config and Power Up */ AIC3204_rset( 0, 0x00 ); // Select page 0 AIC3204_rset( 27, 0x00 ); // BCLK and WCLK is set as i/p to AIC3204(Slave) AIC3204_rset( 4, 0x07 ); // PLL setting: PLLCLK <- BCLK and CODEC_CLKIN <-PLL CLK AIC3204_rset( 6, 0x08 ); // PLL setting: J AIC3204_rset( 7, 0 ); // PLL setting: HI_BYTE(D) AIC3204_rset( 8, 0 ); // PLL setting: LO_BYTE(D) /* For 48 KHz sampling */ AIC3204_rset( 5, 0x92 ); // PLL setting: Power up PLL, P=1 and R=2 AIC3204_rset( 13, 0x00 ); // Hi_Byte(DOSR) for DOSR = 128 decimal or 0x0080 DAC oversamppling AIC3204_rset( 14, 0x80 ); // Lo_Byte(DOSR) for DOSR = 128 decimal or 0x0080 AIC3204_rset( 20, 0x80 ); // AOSR for AOSR = 128 decimal or 0x0080 for decimation filters 1 to 6 AIC3204_rset( 11, 0x88 ); // Power up NDAC and set NDAC value to 8 AIC3204_rset( 12, 0x82 ); // Power up MDAC and set MDAC value to 2 AIC3204_rset( 18, 0x88 ); // Power up NADC and set NADC value to 8 AIC3204_rset( 19, 0x82 ); // Power up MADC and set MADC value to 2 /* DAC ROUTING and Power Up */ AIC3204_rset( 0, 0x01 ); // Select page 1 AIC3204_rset( 12, 0x08 ); // LDAC AFIR routed to HPL AIC3204_rset( 13, 0x08 ); // RDAC AFIR routed to HPR AIC3204_rset( 0, 0x00 ); // Select page 0 AIC3204_rset( 64, 0x02 ); // Left vol=right vol AIC3204_rset( 65, 0x00 ); // Left DAC gain to 0dB VOL; Right tracks Left AIC3204_rset( 63, 0xd4 ); // Power up left,right data paths and set channel AIC3204_rset( 0, 0x01 ); // Select page 1 AIC3204_rset( 16, 0x06 ); // Unmute HPL , 6dB gain AIC3204_rset( 17, 0x06 ); // Unmute HPR , 6dB gain AIC3204_rset( 9, 0x30 ); // Power up HPL,HPR AIC3204_rset( 0, 0x00 ); // Select page 0 EVM5517_wait( 500 ); // Wait /* ADC ROUTING and Power Up */ AIC3204_rset( 0, 0x01 ); // Select page 1 AIC3204_rset( 52, 0x0C ); // STEREO 1 Jack // IN2_L to LADC_P through 40 kohm AIC3204_rset( 55, 0x0C ); // IN2_R to RADC_P through 40 kohmm AIC3204_rset( 54, 0x03 ); // CM_1 (common mode) to LADC_M through 40 kohm AIC3204_rset( 57, 0xC0 ); // CM_1 (common mode) to RADC_M through 40 kohm AIC3204_rset( 59, 0x00 ); // MIC_PGA_L unmute AIC3204_rset( 60, 0x00 ); // MIC_PGA_R unmute AIC3204_rset( 0, 0x00 ); // Select page 0 AIC3204_rset( 81, 0xc0 ); // Powerup Left and Right ADC AIC3204_rset( 82, 0x00 ); // Unmute Left and Right ADC AIC3204_rset( 0, 0x00 ); EVM5517_wait( 200 ); // Wait /* I2S settings */ I2S0_SRGR = 0x0015; I2S0_ICMR = 0x0028; // Enable interrupts I2S0_CR = 0x8012; // 16-bit word, Master, enable I2S /* Play Tone */ for( i = 0 ; i < 5 ; i++ ) { for( j = 0 ; j < 1000 ; j++ ) { for( sample = 0 ; sample < 48 ; sample++ ) { I2S0_W0_MSW_W = (sinetable[sample]/5) ; // Send left sample I2S0_W0_LSW_W = 0; I2S0_W1_MSW_W = (sinetable[sample]/5) ; // Send right sample I2S0_W1_LSW_W = 0; while((Xmit & I2S0_IR) == 0); // Wait for interrupt } } } /* Disble I2S */ I2S0_CR = 0x00; return0;}Kailyn Chen：
具体可以参考这篇应用手册有关volume调节寄存器中gain level 设置www.ti.com/.../slaa557.pdf
