How to get SAI running with FRDM-KL28Z

christoffer — Tue, 16 May 2017 13:03:40 GMT

Hi,

Is there any example on how to get SAI running with FRDM-KL28Z using SDK_2.2_FRDM-KL28Z?

I have tried with the below code to send some bytes but it hangs in the SAI_WriteBlocking. This due to register bit FWF (Enabled transmit FIFO is empty) will not be set after sending first word. Anyone knows why?

Best regards,

Christoffer

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#define BUFFER_SIZE (64)

uint8_t srcBuff[BUFFER_SIZE];

sai_config_t user_config;

sai_transfer_format_t user_format;

user_config.protocol = kSAI_BusPCMA,
user_config.masterSlave = kSAI_Master;
user_config.mclkSource = kSAI_MclkSourceSysclk;
user_config.bclkSource = kSAI_BclkSourceMclkDiv;
user_config.syncMode = kSAI_ModeAsync;

SAI_TxInit(I2S0, &user_config);

user_format.bitWidth = 16;
user_format.channel = 0;
user_format.masterClockHz = 24000000;
user_format.protocol = kSAI_BusPCMA;
user_format.sampleRate_Hz = 8000;
user_format.stereo = kSAI_Stereo;
user_format.watermark = 4;

SAI_TransferTxSetFormat(I2S0,&user_handle,&user_format,25000000,24000000);

SAI_TxEnable(I2S0,true);

SAI_WriteBlocking(I2S0, 0, 16, srcBuff, BUFFER_SIZE);

Re: How to get SAI running with FRDM-KL28Z

Robin_Shen — Wed, 07 Jun 2017 09:03:00 GMT

Hi christoffer,

There are several SAI examples in SDK_2.2_TWR-KL28Z72M. Maybe you can refer these examples.

I try to test the SAI interrupt_transfer example in SDK_2.2_TWR-KL28Z72M with default sai_config.

Just modify the code shown below.

I can hear the tone from headphone which connect to J7-SGTL5000.

Have you try to use other user_config.protocol, for example:

user_config.protocol = kSAI_BusLeftJustified;

Best Regards,

Robin

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