C6747利用McASP发送中断方式完成音频输入信号的直接输出

yusijiangchengm · 发表于 2016-3-15 16:07:18

C6747和C6748感觉差不多，我想实现McASP发送中断方式控制音频信号，在轮询的例程基础上改的，轮询程序可以实现，但是中断一直实现不了，也找不到错误，求大神帮忙！下边是主要程序：
main文件：
interrupt void interrupt4(void)
{
  Uint32 sample;

  sample = input_sample(); // read L + R samples from ADC
  output_sample(sample); // write L + R samples to DAC
  return;
}

int main( void )
{

/* Initialize BSL */
EVMC6747_init( );
      /* Call evmc6747_intr function */
aic3106_init( );
      while(1);
}

aic3106_init文件的一部分，McASP配置部分，采用内部时钟，I2S方式，同步传输。音频芯片的配置应该没问题
/* Initialize MCASP1 */
mcasp = &MCASP_MODULE_1;
mcasp->regs->GBLCTL  = 0;    // Reset
mcasp->regs->RGBLCTL = 0;    // Reset RX
mcasp->regs->XGBLCTL = 0;    // Reset TX
mcasp->regs->PWRDEMU = 1;    // Free-running
// configure McASP0 receive registers
mcasp->regs->RMASK    = 0xFFFFFFFF; // No padding used
mcasp->regs->RFMT    = 0x00018078; // MSB 16bit, 0-delay, no pad, CFGBus
mcasp->regs->AFSRCTL = 0x00000112; // 2TDM, 1bit Falling, External FS, word
mcasp->regs->ACLKRCTL = 0x000000AF; // Rising INTERNAL CLK,(from tx side)
mcasp->regs->AHCLKRCTL  = 0x00000000; // INT CLK (from tx side)
mcasp->regs->RTDM    = 0x00000003; // Slots 0,1
mcasp->regs->RINTCTL = 0x00000000; // Not used
mcasp->regs->RCLKCHK = 0x00FF0008; // 255-MAX 0-MIN, div-by-256

mcasp->regs->XMASK    = 0xFFFFFFFF; // No padding used
mcasp->regs->XFMT    = 0x00018078; // MSB 16bit, 0-delay, no pad, CFGBus
mcasp->regs->AFSXCTL = 0x00000112; // 2TDM, 1bit Rising edge INTERNAL FS, word
mcasp->regs->ACLKXCTL = 0x000000AF; // ASYNC, Rising INTERNAL CLK, div-by-16
mcasp->regs->AHCLKXCTL  = 0x00000000; // EXT CLK
mcasp->regs->XTDM    = 0x00000003; // Slots 0,1
mcasp->regs->XINTCTL = 0x00000020; // interrupt on transmit
mcasp->regs->XCLKCHK = 0x00FF0008; // 255-MAX 0-MIN, div-by-256

mcasp->regs->SRCTL5    = 0x000D;    // MCASP1.AXR1[5] --> DIN
mcasp->regs->SRCTL0    = 0x000E;    // MCASP1.AXR1[0] <-- DOUT
mcasp->regs->PFUNC    = 0;       // All MCASPs
mcasp->regs->PDIR    = 0x14000020; // All inputs except AXR0[5], ACLKX1, AFSX1

mcasp->regs->DITCTL    = 0x00000000; // Not used
mcasp->regs->DLBCTL    = 0x00000000; // Not used
mcasp->regs->AMUTE    = 0x00000000; // Not used

/* Starting sections of the McASP*/
mcasp->regs->XGBLCTL |= GBLCTL_XHCLKRST_ON;
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XHCLKRST_ON ) != GBLCTL_XHCLKRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RHCLKRST_ON;
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RHCLKRST_ON ) != GBLCTL_RHCLKRST_ON );

mcasp->regs->XGBLCTL |= GBLCTL_XCLKRST_ON;
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XCLKRST_ON ) != GBLCTL_XCLKRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RCLKRST_ON;
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RCLKRST_ON ) != GBLCTL_RCLKRST_ON );

mcasp->regs->XSTAT = 0x0000ffff;
mcasp->regs->RSTAT = 0x0000ffff;

mcasp->regs->XGBLCTL |= GBLCTL_XSRCLR_ON;
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XSRCLR_ON ) != GBLCTL_XSRCLR_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RSRCLR_ON;
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RSRCLR_ON ) != GBLCTL_RSRCLR_ON );

/* Write a 0, so that no underrun occurs after releasing the state machine */
mcasp->regs->XBUF5 = 0;
mcasp->regs->RBUF0 = 0;

mcasp->regs->XGBLCTL |= GBLCTL_XSMRST_ON;
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XSMRST_ON ) != GBLCTL_XSMRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RSMRST_ON;
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RSMRST_ON ) != GBLCTL_RSMRST_ON );

mcasp->regs->XGBLCTL |= GBLCTL_XFRST_ON;
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XFRST_ON ) != GBLCTL_XFRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RFRST_ON;
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RFRST_ON ) != GBLCTL_RFRST_ON );

CSR = 0x0000;
INTC_INTMUX1 = 0x3d;
ISTP = (unsigned int)vectors;
ICR = 0xFFF0;
IER |= 0x12;
CSR |= 0x01;

还有就是两个输入输出函数：
void output_sample(Int32 out_data)
{
  AIC31_data.uint = out_data;
  MCASP1_XBUF5_32BIT = AIC31_data.uint;
}

Int32 input_sample(void)
{
  AIC31_data.uint = MCASP1_RBUF0_32BIT;
  return (AIC31_data.uint);
}

human · 发表于 2016-3-16 11:55:59

可以参看创龙提供的例程：AUDIO_LINE_OUT_INTR——Line Out 音频输出（中断方式）

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