About edwin8

edwin8 · 2019-06-26

On a NUCLEO-H743ZI board, I am using ADC3 configured like so:16-bit mode 6 MHz ADC clock8.5 cycles sampling timeTriggered by TIM3 to scan 4 channels every 10us BDMA puts the results into a memory bufferThe problem I have is that for a given voltage, ...

edwin8 · 2019-05-22

I'm using a Nucleo-H743ZI and have configured ADC3 to trigger off of TIM3. It is scanning 4 channels every 10 us. I also have BDMA configured for the ADC. The ADC end-of-scan interrupt is occurring every 10 us, but the DMA interrupt is only occurr...

edwin8 · 2019-05-21

On the Nucleo-H743ZI board, I'm trying to configure TIM3 with a 10 us period. With the internal clock source at 200MHz, I would expect these parameters to create a 10 us TIM3 interrupt:htim3.Instance = TIM3; htim3.Init.Prescaler = 200; htim3.Init...

edwin8 · 2019-05-21

I am using a NUCLEO-H743ZI board. Using STM32CubeMX, I was able to set SYSCLOCK to 400 MHz like so:With STM32CubeIDE, it won't allow me to do the same:What should I be doing here instead?STM32CubeIDE has been really frustrating.

edwin8 · 2019-05-23

OK, I'm confused now. The description of Length in my project is your first one, so that's why I set Length to 16. This resulted in ADC intr every 10 us, but DMA intr every 20 us.I changed Length to 8 just for testing, and get ADC intr and DMA intr ...

edwin8 · 2019-05-23

And just to test, I changed the number of bytes to 8 in the HAL_ADC_Start_DMA() call and I do get a DMA interrupt every 10us now instead of every 20us. I expected the adcresults[] array to only be half filled, but it is being entirely filled, and wit...

edwin8 · 2019-05-23

I set the data width to word, since the ADC data register is 32 bits:void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc) { GPIO_InitTypeDef GPIO_InitStruct = {0}; if(hadc->Instance==ADC3) { /* Peripheral clock enable */ __HAL_RCC_ADC3_CLK_E...

edwin8 · 2019-05-22

I don't think my DMA is configured correctly, but I don't know how to fix it. The ADC is configured to scan 4 channels and trigger every 10 us based on TIM3: hadc3.Instance = ADC3; hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1; hadc3.Init.Res...

edwin8 · 2019-05-22

Thanks @Bob S, for the comment about the ClockDivision field not having anything to do with what I was doing. I did not realize that. And thanks for pointing me to the app note.

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High variance in ADC readings

Help with ADC and DMA

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