STM32 MCUs Embedded software

sd card cannot be accessed with SDMMC in 4-bit mode

I have set the parameter "mode" in CubeMx to SD 4 bits wide bus.But after doing so, I cannot access newer SD cards (HX) any more. Older cards (512 MB) work fine, which I assume is due to the fact that these cards do not support the 4-bit access from ...

Hello, I want to build a System with STM32H743ZI and Camera Sensor OV9655. I use DCMI and I2C Interface. Is there any example code which I can use? I would like to use HAL.library but if there is any code it would help a lot. Kind regards Tim

I am using the HAL receive_IT and transmit_IT successfully but occasionally as the transmit is being setup part way through the receive message the receive interrupt fails to get enabled and an overrun error occurs. Does anyone have a solution for this?

I receive the data byte by byte and I can see that the only time that it fails is at the beginning of the transmit. It looks like the HAL is busy starting the transmit so it cannot re-enable the receive interrupt after the previous byte has been rec...

The interrupt happend in APP but enter bootloader ISR

MCU:STM32F030C8Bootloader section:Flash: 0x08000000 - 0x08003FFF; RAM:0x20000000 - 0x200004FFAPP section: Flash:0x08004000 - 0x0800FFFF; RAM:0x20000500 - 0x20001FFFReview the map file, the interrupt vector has remapped to APP flash, but when work in ...

boot sequence for STM32F303E.

hi STM,i want to flash STM32F303E controller via uart. what is the procedure to achieve this?my mcu board is connected to pc via RS485. as per user manual i have to send 0x7F for uart flash. but i can't send 0x7F.so please suggest the possible ways ...

How to suppress initial glitch in DAC output.

In my application i have implemented WAV tone player with STM32F072RB using HAL library which utilizes internal DAC with DMA. when i start playback the tone there is spike at DAC output in a initial playback(after power up) and next successive playba...

I am trying to implement fatfs usb project for stm32l073RZ board with an external spi flash .

where i have enabled fatfs and usb mass storage in cubemx and generated a project,i have tested the usb mass storage successfuly ,when plugged in my pc it is able to detect the usb as mass storage and prompts to format it.This is were i am stuck:I ha...

How to calculate free space on a USB stick using f_getfree

Hello, I found this handy site with example code on getting free space on a USB connected to my STM32F7. The example code says "assuming 512 bytes/sector"... but I can't get the math to work out. How do I tell how many bytes per sector is on my USB d...

STM32L4 USB MSD Bootloader can't connect to WIN10.

This is the second time I’ve asked for help about coding a USB MSD bootloader for the STM32L4 using the STM32L4R9I-EVAL board. I gave up for a while but would really like to figure this out so I can move forward and be able to use the STM32L4. I used...

Is .fpu incorrect in startup_stm32f411xe.s?

In startup_stm32f411xe.s, the FPU seems to be incorrectly declared. It is: .fpu softvfpShouldn't it be: .fpu fpv4-sp-d16I checked other files in the same family and they also have the softvfp declaration.