SAIF1 as output

[carlosrivera]

Hello

I am using WinCE 6.3 on a custom board based on i.mx28EVK, and I need to reconfigure the audio ports in order to play a sound.

On i.mx28 EVK SAIF0 is configured as output while SAIF1 is configured as input; to have full duplex interface. I tried to use the same configuration as SAIF0 on SAIF1 and remove SAIF0 from the driver, but the program hangs when I try un a *.wav file.

    // Init SAIF0(AUDIOOUT)

    // Reset SAIF0

    HW_SAIF_CTRL_SET(0, BM_SAIF_CTRL_SFTRST);

    // Wait for some time

    HW_SAIF_CTRL_RD(0);

    // In order to configure SAIF0,  we must first clear the CLKGATE and SFTRST bit

    HW_SAIF_CTRL_CLR(0, BM_SAIF_CTRL_SFTRST);

    // Wait for some time

    HW_SAIF_CTRL_RD(0);

    // Clear the clock gate for normal operation

    HW_SAIF_CTRL_CLR(0, BM_SAIF_CTRL_CLKGATE);

    // Wait for some time

    HW_SAIF_CTRL_RD(0);

    // 16bit sample

    HW_SAIF_CTRL_WR(0, BF_SAIF_CTRL_SFTRST(0)                    |

                       BF_SAIF_CTRL_CLKGATE(0)                   |

                       BF_SAIF_CTRL_BITCLK_MULT_RATE(0)          |

                       BF_SAIF_CTRL_BITCLK_BASE_RATE(0)          |

                       BF_SAIF_CTRL_FIFO_ERROR_IRQ_EN(0)         |

                       BF_SAIF_CTRL_FIFO_SERVICE_IRQ_EN(0)       |

                       BF_SAIF_CTRL_DMAWAIT_COUNT(0)             |

                       BF_SAIF_CTRL_CHANNEL_NUM_SELECT(0)        |

                       BF_SAIF_CTRL_BIT_ORDER(0)                 |

                       BF_SAIF_CTRL_DELAY(1)                     |

                       BF_SAIF_CTRL_JUSTIFY(0)                   |

                       BF_SAIF_CTRL_LRCLK_POLARITY(0)            |

                       BF_SAIF_CTRL_BITCLK_EDGE(0)               |

                       BF_SAIF_CTRL_WORD_LENGTH(0)               |

                       BF_SAIF_CTRL_BITCLK_48XFS_ENABLE(0)       |

                       BF_SAIF_CTRL_SLAVE_MODE(0)                |

                       BF_SAIF_CTRL_READ_MODE(0)                 |

                       BF_SAIF_CTRL_RUN(1));

The configuration code I am trying to modify is located in bsphwctxt.cpp.

Is there ant other place where I should modify the code?.

I will appreciate any help.

Carlos

[YixingKong]

Carlos

This discussion is closed since no activity. If you still need help, please feel free to reply with an update to this discussion, or create another discussion.

Thanks,

Yixing

[YixingKong]

Carlos

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,

Yixing

[Bio_TICFSL]

I was able to reproduced the issue on Wince 6.0 bsp, AdeneoEmbedded team have you any suggestion for this issue? have you seen this on wince 7]

I just checked the initialization sequence, and this procedure works as workaround for me, however I used full duplex on both SAIF:

- Clear SFTRST and CLKGATE in HW_SAIF_CTRL.

- Configure HW_SAIF_CTRL for the required frame format.

- Fill the FIFO with the first 4 sample pairs (for stereo) from your data stream by writing to HW_SAIF_DATA.

- Set up your interrupt handler for IRQ #10 (SAIF1&2 FIFO IRQ).

- Clear FIFO_UNDERFLOW_IRQ and FIFO_OVERFLOW_IRQ in HW_SAIF_STAT by writing a 1 to those bits of HW_SAIF_STAT_CLR (the SCT clear variant).

- Set FIFO_SERVICE_IRQ_EN and FIFO_ERROR_IRQ_EN in HW_SAIF_CTRL to 1.

- Enable IRQ #10 in the ICOLL.

- Set HW_SAIF_CTRL.B.RUN to start transmitting.

When you get an interrupt on IRQ #10:

- Check the HW_SAIF_STAT.B.FIFO_UNDERFLOW_IRQ and HW_SAIF_STAT.B.FIFO_OVERFLOW_IRQ bits to see if there was a FIFO error. If so, clear the appropriate IRQ and take whatever action you need.

- If HW_SAIF_STAT.B.FIFO_SERVICE_IRQ  is set, fill the FIFO again by writing sample frames to HW_SAIF_DATA. For each frame, that will be one write for each pair of channels, as described in the RM. You can watch for HW_SAIF_STAT.B.FIFO_SERVICE_IRQ to clear to know when the FIFO has been filled.

Also checked the Linux BSP and it works well on it, I checked mxs-dai.c, mxs_saif_0 and mxs_saif_1 need to be changed as belows:

struct mxs_pcm_dma_params mxs_saif_0 = {

        .name = "mxs-saif-0",

        .dma_ch = MXS_DMA_CHANNEL_AHB_APBX_SAIF1

        .irq = IRQ_SAIF1_DMA

};

struct mxs_pcm_dma_params mxs_saif_1 = {

        .name = "mxs-saif-1",

        .dma_ch = MXS_DMA_CHANNEL_AHB_APBX_SAIF2

        .irq = IRQ_SAIF2_DMA

};

hope this helps

Regards