AN3959 datasheet(57/65 Pages) STMICROELECTRONICS

57 / 65 page

AN3959

Examples of code (TV SoC)

Doc ID 022081 Rev 3

57/65

I2Cm_Rx(&I2C_buf1,FFX_MAIN_VOLUME,1,FFX_I2C_ADDR);

MUTEVolSave = I2C_buf1; // Save the current Gain

I2C_buf1=0xFE;

I2Cm_Tx(&I2C_buf1,FFX_MAIN_VOLUME,1,FFX_I2C_ADDR);

Wait(10);//10-20ms delay

}

else

{

I2Cm_Tx(&MUTEVolSave,FFX_MAIN_VOLUME,1,FFX_I2C_ADDR);

Wait(10);//10-20ms delay

}

return;

}

/*the channel volume is responsible for the each channel volume

control, it's range from -79.5dB to 48dB, every step as 0.5dB,

channelvolume=255-((dbrequest+79.5)*2);

0=48dB

(255-(48+79.5)*2)

255=-79.5dB

(255-(-79.5+79.5)*2)

0x60=0dB

(255-(0+79.5)*2)

void STA381BWX_SetLeftVolume(unsigned char LeftVolume)

{

I2C_buf1 =LeftVolume;

I2Cm_Tx(&I2C_buf1,FFX_CHANNEL1_VOL,1,FFX_I2C_ADDR);

return;

}

void STA381BWX_SetRightVolume(unsigned char RightVolume)

{

I2C_buf1 =RightVolume;

I2Cm_Tx(&I2C_buf1,FFX_CHANNEL2_VOL,1,FFX_I2C_ADDR);

return;

}

void STA381BWX_SetSubWooferVolume(unsigned char SubWooferVolume)

{

I2C_buf1 =SubWooferVolume;

I2Cm_Tx(&I2C_buf1,FFX_CHANNEL3_VOL,1,FFX_I2C_ADDR);

AN3959 Datasheet(PDF) 57 Page - STMicroelectronics

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