SAI configuration of the STM32L5xxx board

[DYann.1]

Hello,

I would like to know if there are people who have already configured the SAI PORT to communicate with a CODEC ?

I configured like this :

But I don't have the clock on the PIN PF7 :

The SAI_MCLK_B is the curve in blue. Thank you for your helps.
Regards.

[AScha.3]

yes, SAI to ES9038 DAC . working fine.

but...you just enabled the sai. doing nothing....

you see signal (and clock) when you send something !

typical I2S is continuous stream, so circular DMA -> SAI -> DAC (codec)

[DYann.1]

Hello,

I'm working SAI with another CODEC (SGTL5000) but the principle is the same for the SAI. First, I sent data to configure the CODEC via the I2C bus, that you can see in my previous screenshot (the yellow curve) but I haven't nothing on the PIN 'SAI_MCLK_B'. 

I don't know if it is necessary to work in interruption, after your answer I have to work in DMA but how ?

How to configure the settings? Do we leave it as default ?

why in mode without DMA we do not see the clock ?

[AScha.3]

clock...dont know. but without continuous stream anyway useless...the dac will not work.

so use dma channel ->

enable callbacks in project-> advanced settings

in main : register callbacks

then start it

init buffer, size should match, what you expect in update interval; i use 32bit data ymmv.

int32_t playbuf[4096*2] __attribute__ ((aligned (32)));

and for begin, switch off d-cache, if your cpu has it. (cache management ...for later. :) )

in callbacks put your data, or for "pause" , set data zero. but never stop the running stream !

 

[DYann.1]

I tried with this configuration but there are too many errors in this code

24 errors

Now I have no more errors these are priorities

[DYann.1]

uint16_t write (uint16_t reg,uint16_t data)
{ 	HAL_StatusTypeDef txResponse;
	uint8_t buff[4] ;
	buff[3]=0xff & data;
	buff[2]= 0xff & data>>8;
	buff[1]= 0xff & reg;
	buff[0]= 0xff & reg;

	txResponse = HAL_I2C_Master_Transmit(&hi2c1,WRITE_ADDRESS,buff,4,HAL_MAX_DELAY); //0XFF
 if (txResponse != HAL_OK)
	{
 	return HAL_ERROR;
	}
 HAL_Delay(1) ;
 return (0);
}

I don't know where is the 'DCACHE' but now I have a clock on the MCLK pin and I have no errors on my I2C bus.
Before I have an error in this function. Thank you for your helps AScha.3.

[AScha.3]

good !

and - if not there - your cpu has no d-cache !  :)