static void McASPI2SConfigure(void)
{
McASPRxReset(SOC_MCASP_0_CTRL_REGS);
McASPTxReset(SOC_MCASP_0_CTRL_REGS);
/* Enable the FIFOs for DMA transfer
* 启用FIFO进行DMA传输*/
McASPReadFifoEnable(SOC_MCASP_0_FIFO_REGS, 4, 1);
McASPWriteFifoEnable(SOC_MCASP_0_FIFO_REGS, 4, 1);
/* Set I2S format in the transmitter/receiver format units
* 以收发格式为单位设定i2s格式，在发送器/接收器单元的格式设定I2S格式*/
McASPRxFmtI2SSet(SOC_MCASP_0_CTRL_REGS, WORD_SIZE, SLOT_SIZE,
MCASP_RX_MODE_DMA);
McASPTxFmtI2SSet(SOC_MCASP_0_CTRL_REGS, WORD_SIZE, SLOT_SIZE,
MCASP_TX_MODE_DMA);
/* Configure the frame sync. I2S shall work in TDM format with 2 slots*/
McASPRxFrameSyncCfg(SOC_MCASP_0_CTRL_REGS, 8, MCASP_RX_FS_WIDTH_WORD,
MCASP_RX_FS_EXT_BEGIN_ON_FALL_EDGE);//帧同步的信号设置，外部，上升沿
McASPTxFrameSyncCfg(SOC_MCASP_0_CTRL_REGS, 8, MCASP_RX_FS_WIDTH_WORD,
MCASP_TX_FS_INT_BEGIN_ON_FALL_EDGE);//帧同步的信号设置，内部，上升沿
/* configure the clock for receiver*/
McASPRxClkCfg(SOC_MCASP_0_CTRL_REGS, MCASP_RX_CLK_EXTERNAL, 0, 0);//外部时钟
McASPRxClkPolaritySet(SOC_MCASP_0_CTRL_REGS, MCASP_RX_CLK_POL_RIS_EDGE);
McASPRxClkCheckConfig(SOC_MCASP_0_CTRL_REGS, MCASP_RX_CLKCHCK_DIV32,
0x00, 0xFF);
/* configure the clock for transmitter
*
*/
McASPTxClkCfg(SOC_MCASP_0_CTRL_REGS, MCASP_TX_CLK_MIXED, 11, 0);
McASPTxClkPolaritySet(SOC_MCASP_0_CTRL_REGS, MCASP_TX_CLK_POL_FALL_EDGE);
McASPTxClkCheckConfig(SOC_MCASP_0_CTRL_REGS, MCASP_TX_CLKCHCK_DIV32,
0x00, 0xFF);
/* Enable synchronization of RX and TX sections
//McASPTxRxClkSyncEnable(SOC_MCASP_0_CTRL_REGS);
/* Enable the transmitter/receiver slots. I2S uses 2 slots
*/
McASPRxTimeSlotSet(SOC_MCASP_0_CTRL_REGS, I2S_SLOTS);
McASPTxTimeSlotSet(SOC_MCASP_0_CTRL_REGS, I2S_SLOTS);
/*
** Set the serializers, Currently only one serializer is set as
** transmitter and one serializer as receiver.
*/
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX1);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX1);
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX2);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX2);
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX3);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX3);
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX4);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX4);
/*
** Configure the McASP pins
** Input – Frame Sync, Clock and Serializer Rx
** Output – Serializer Tx is connected to the input of the codec
*/
McASPPinMcASPSet(SOC_MCASP_0_CTRL_REGS, 0xFFFFFFFF);//设置McASP引脚用于McASP功能
McASPPinDirOutputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AXR(MCASP_XSER_TX1)
| MCASP_PIN_AFSX
| MCASP_PIN_ACLKX);//将McASP引脚配置为输出引脚。
McASPPinDirOutputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AXR(MCASP_XSER_TX2)
| MCASP_PIN_AFSX
| MCASP_PIN_ACLKX);
McASPPinDirOutputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AXR(MCASP_XSER_TX3)
| MCASP_PIN_AFSX
| MCASP_PIN_ACLKX);
McASPPinDirOutputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AXR(MCASP_XSER_TX4)
| MCASP_PIN_AFSX
| MCASP_PIN_ACLKX);
McASPPinDirInputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AFSR
| MCASP_PIN_ACLKR
| MCASP_PIN_AXR(MCASP_XSER_RX1));
McASPPinDirInputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AFSR
| MCASP_PIN_ACLKR
| MCASP_PIN_AXR(MCASP_XSER_RX2));
McASPPinDirInputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AFSR
| MCASP_PIN_ACLKR
| MCASP_PIN_AXR(MCASP_XSER_RX3));
McASPPinDirInputSet(SOC_MCASP_0_CTRL_REGS, MCASP_PIN_AFSR
| MCASP_PIN_ACLKR
| MCASP_PIN_AXR(MCASP_XSER_RX4));
/* Enable error interrupts for McASP
McASPTxIntEnable(SOC_MCASP_0_CTRL_REGS, MCASP_TX_DMAERROR
| MCASP_TX_CLKFAIL
| MCASP_TX_SYNCERROR
| MCASP_TX_UNDERRUN);
McASPRxIntEnable(SOC_MCASP_0_CTRL_REGS, MCASP_RX_DMAERROR
| MCASP_RX_CLKFAIL
| MCASP_RX_SYNCERROR
| MCASP_RX_OVERRUN);
}
这样对不对。还有edma3怎么弄
Tony Tang：
user5324036
*/
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX1);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX1);
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX2);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX2);
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX3);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX3);
McASPSerializerRxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_RX4);
McASPSerializerTxSet(SOC_MCASP_0_CTRL_REGS, MCASP_XSER_TX4);
/*
这个对照下面的源码，是不是后一个把前一个覆盖了啊。MCASP_XSER_RX1， MCASP_XSER_TX1是在哪定义的？
/** * \brief Sets a serializer as transmitter * * \param baseAddr Base Address of the McASP Module Registers. * \param serNum Serializer which is to be used as Transmitter. * * \return None. * **/void McASPSerializerTxSet(unsigned int baseAddr, unsigned int serNum){ HWREG(baseAddr + MCASP_SRCTL(serNum)) &= ~MCASP_SRCTL0_SRMOD; HWREG(baseAddr + MCASP_SRCTL(serNum)) |= MCASP_SRCTL_SRMOD_TX; }
/** * \brief Sets a serializer as receiver * * \param baseAddr Base Address of the McASP Module Registers. * \param serNum Serializer which is to be used as Receiver. * * \return None. * **/void McASPSerializerRxSet(unsigned int baseAddr, unsigned int serNum){ HWREG(baseAddr + MCASP_SRCTL(serNum)) &= ~MCASP_SRCTL0_SRMOD; HWREG(baseAddr + MCASP_SRCTL(serNum)) |= MCASP_SRCTL_SRMOD_RX;
}
多通道的配置对于单通道来说，仅仅是使能多个数据线就好了。
关于EDMA的配置，参考下面截图的说明：
TI中文支持网
