About Drew M

Drew M · 2023-06-30

Hi,I am using the STM32H747I-DISCO board and B-CAMS-OMV daughterboard with integrated OV5640 image sensor to test out using a camera on an MCU. I have been using this example as the base code I am working with but have modified it to communicate imag...

Drew M · 2020-07-22

Hi,I'm using CubeMX generated HAL drivers to use SPI in DMA mode. In my particular situation, we are sending a small amount of data (3 bytes) very often over the SPI interface. The data transmission works fine most of the time, but sometimes (as litt...

Drew M · 2023-07-07

Hi Kaouthar, thanks for your reply.I believe I am already using DMA double buffer mode, as utilized by HAL_DCMI_Start_DMA() in stm32h7xx_hal_dcmi.c : https://github.com/STMicroelectronics/STM32CubeH7/blob/master/Drivers/STM32H7xx_HAL_Driver/Src/stm32...

Drew M · 2020-07-23

I have the D-cache disabled on the system, so I don't that should be interfering with anything. I haven't had any issue with the other DMA streams that are in use, so I'm wondering if the small data size and frequency of starting/ending transfers is ...

Drew M · 2020-07-23

Thanks for the reply JW,Are you suggesting that the debugger reading the data register could be pulling data out of the SPI Rx FIFO and inadvertently interfering with the normal register access sequence?I've tried closing my memory/register windows i...

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Increasing Resolution of OV5640 Camera

SPI DMA Stream Seems to Eventually Freeze

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