BDMA -Availability depends on devices.

[A.Caliskan]

hello

ı use stm32h723zg and ı use bdma for adc3 , I was wondering if bdma can be used with adc3. I looked in the reference guide but couldn't find it. I will be glad if you help.

[Tesla DeLorean]

Data Sheet should indicate the H7xx devices having an ADC3

Will need to check later.​

[A.Caliskan]

I didn't fully understand what you were saying.

[A.Caliskan]

also h723 has error in bdma partition. bdma's register are not available in cube ide. only it have IFCR,ISR.

[Tesla DeLorean]

a) Not all H7 have an ADC3

b) I will look at the DS/RM when I'm at a computer

Part looks to have ADC3 on AHB4, and the BDMA should be able to use it provided the destination buffer is in the SRAM4 (D3 Domain)

[A.Caliskan]

MY code is:

	 LL_AHB4_GRP1_EnableClock(LL_AHB4_GRP1_PERIPH_BDMA);
	// NVIC_SetPriority(BDMA_Channel1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
	// NVIC_EnableIRQ(BDMA_Channel1_IRQn);
 
	 LL_BDMA_InitTypeDef BDMA_InitStruct = {0};
 
	 BDMA_InitStruct.Direction=LL_BDMA_DIRECTION_PERIPH_TO_MEMORY;
	 BDMA_InitStruct.MemoryOrM2MDstAddress=(uint32_t)&sina;
	 BDMA_InitStruct.MemoryOrM2MDstDataSize=LL_BDMA_MDATAALIGN_WORD;
	 BDMA_InitStruct.MemoryOrM2MDstIncMode=LL_BDMA_MEMORY_NOINCREMENT;
	 BDMA_InitStruct.Mode=LL_BDMA_MODE_CIRCULAR ;
	 BDMA_InitStruct.NbData=1;
	 BDMA_InitStruct.PeriphOrM2MSrcAddress=(uint32_t)&ADC3->DR;
	 BDMA_InitStruct.PeriphOrM2MSrcDataSize=LL_BDMA_PDATAALIGN_WORD;
	 BDMA_InitStruct.PeriphOrM2MSrcIncMode=LL_BDMA_PERIPH_NOINCREMENT;
	 BDMA_InitStruct.PeriphRequest=LL_DMAMUX2_REQ_ADC3;
	 BDMA_InitStruct.Priority=LL_BDMA_PRIORITY_VERYHIGH;
	LL_BDMA_StructInit(&BDMA_InitStruct);
     LL_BDMA_Init(BDMA,LL_BDMA_CHANNEL_1,&BDMA_InitStruct);
 
 
 
	// LL_BDMA_EnableIT_TC(BDMA, LL_BDMA_CHANNEL_1);
	 LL_BDMA_EnableChannel(BDMA, LL_BDMA_CHANNEL_1);

[A.Caliskan]

adc works but dma does not send data 

[A.Caliskan]

[Tesla DeLorean]

Is sina[] in SRAM4 (0x38000000) ?

If the BDMA throws a Transfer Error, probably not..

[TDK]

> I was wondering if bdma can be used with adc3.

Yes. BDMA is hooked up to DMAMUX2 per the reference manual. DMAMUX2 is connected to ADC3 through requests 26/27 (ADC3_IT/ADC3_AWD). See "17.3.3 DMAMUX2 mapping".