关于UDA1341控制字请教各位

只看该作者 · 2009-1-8 17:56

UDA1341有两个音频输入通道，选择哪个通道作为输入是不是可以通过控制寄存器来配制？

比如我要用VINL1和VINR1，控制字该是多少

若要用VINL2和VINR2，控制字又该是多少

下面这个程序是用的VINL1和VINR1输入的，我想把它改成VINL2和VINR2输入，如何修改啊

FPGA NIOS 程序

void Init_Audio(void)  //初始化Audio
{
  IOWR_ALTERA_AVALON_PIO_DATA(L3_MODE_BASE, 1);
  IOWR_ALTERA_AVALON_PIO_DATA(L3_CLK_BASE, 1);
  IOWR_ALTERA_AVALON_PIO_DATA(L3_DATA_BASE, 1);
  usleep(10000);
  L3_Write(ADDR, 0x14 | 0x02);    //STATUS
  L3_Write(DATA, 0x60);           //Reset
  usleep(10000);
  L3_Write(ADDR, 0x14 | 0x02);    //STATUS
  L3_Write(DATA, 0x20);           //256fs, IIS, DC-filtering
  usleep(1);
  L3_Write(ADDR, 0x14 | 0x02);    //STATUS
  L3_Write(DATA, 0xe3);           //Gain of DAC:0dB, Gain of ADC:0dB,
                                  //ADC and DAC is non-inverting, Single speed play back
                                  //ADC and DAC is all on
  usleep(1);
  L3_Write(ADDR, 0x14 | 0x00);    //DATA0
  L3_Write(DATA, 0xc2);
  L3_Write(DATA, 0x4d);
}

英文资料看不懂，还请大家帮下忙，谢谢了

1万 · 2009-1-8 19:35

的!
最简单的方法是在硬件上将两个口短接

只看该作者 · 2009-1-9 08:33

只看该作者 · 2009-1-9 09:56

The two stereo ADCs (including the AGC) can be used in
four modes:
· ADC1 only mode (for line input); input channel 2 is off
· ADC2 only mode, including PGA and digital AGC (for
microphone input); input channel 1 is off
· ADC1 + ADC2 mixer mode, including PGA and AGC
· ADC1 and ADC2 double differential mode (improved
ADC performance).

7.21.3.3 Mixer mode
A 2-bit value to program the mode of the digital mixer.
There are four modes: double differential, input channel 1
select, input channel 2 select and digital mixer mode.
The default setting is given in Table 5.
Table 28 Mixer mode switch settings

MM1 MM0  FUNCTION
0   0   double differential mode
0   1   input channel 1 select (input channel 2 off)
1   0   input channel 2 select (input channel 1 off)
1   1   digital mixer mode
是这里了吧