About ajmw_

ajmw_ · 2024-07-25

I have an STM32-L4P5DK connected to an external ADC, with SPI2 configured to read ADC samples on every falling edge of the DRDY signal. The DMA1 configuration is as follows:DMA1 CHANNEL1: DMA_GENERATOR0DMA1 CHANNEL2: SPI2_TXDMA1 CHANNEL3: SPI2_RXThe...

ajmw_ · 2024-07-24

I have an ADC connected to an STM32-L4P5DK. Data should be read in the background by the DMA controller. SPI TX is assigned to DMA1 CHANNEL2, and SPI RX is assigned to DMA1 CHANNEL3. Both DMA1 CHANNEL2 and CHANNEL3 are synchronized with EXTI1 (DRDY s...

ajmw_ · 2024-07-26

>Sounds like there is data in the FIFO that hasn't been read out properlyI have explained my application in the thread. The first four bytes are unnecessary data. I have verified the threshold bit (FRXTH set to 1). I also tried reading four bytes ini...

ajmw_ · 2024-07-26

Another issue I am facing is that, although I see the expected output on the scope, the first four bytes (0th byte to 3rd byte) from the SPI read are always junk. The correct data starts only from the 4th byte.For example,adc_buf = [0x00, 0x6f, 0x10,...

ajmw_ · 2024-07-26

Hi TDK, I tried polling the SPI BSY bit, but it did not work. The CS pin becomes high even before the SPI transmission starts.I have resolved the chip select issue by starting the timer in the `HAL_GPIO_EXTI_Callback` function. After 120us (since I a...

ajmw_ · 2024-07-25

Thank you, @BarryWhit, for your response.The issue was with the function call. Instead of passing the &hdma_spi2_rx handle, the &hdma_spi2_tx handle was passed.correct usage: HAL_DMA_Start_IT(&hdma_spi2_rx, (uint32_t)adc_buf, (uint32_t)&(SPI2->DR), 0...

ajmw_ · 2024-07-25

> What do you mean by that? Isn't the DMA configured to move data over SPI? No , I am writing GPIOx_BRR register on every falling edge of DRDY signal to reset the chip select pin (active low). All the DMA requests(SPI_TX , SPI_RX and DMA_GENARATOR0...

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Issue with Chip Select Pin Timing in STM32-L4P5DK SPI DMA Configuration.

STM32 SPI2 Not Receiving Data via DMA Despite Clock Generation.

Re: Issue with Chip Select Pin Timing in STM32-L4P5DK SPI DMA Configuration.

Re: Issue with Chip Select Pin Timing in STM32-L4P5DK SPI DMA Configuration.

Re: Issue with Chip Select Pin Timing in STM32-L4P5DK SPI DMA Configuration.

Re: STM32 SPI2 Not Receiving Data via DMA Despite Clock Generation.

Re: STM32 SPI2 Not Receiving Data via DMA Despite Clock Generation.