How to use eMMC in H745i

[Maximiliano]

Good morning to all,

I would like to learn how to use the eMMC that has my STM32H745i-Disk, something simple a simple structure with data to save when the board is turned off and read when it turns on.

The data to save is the following structure:

typedef struct {
  char date1[11];
  char date2[11];
  unsigned int id;
} DateStruct;

In examples of STM cube ide I found 2 examples, one with DMA and another with IT but not having a structure as in the projects it is difficult for me to understand it.
Usually I found videos about the things I wanted to do with the board and I learned this way, in this case I didn't find any. Is there any other example of how to use it? or maybe where to learn more about it with practical examples?

and took a look at the following reference:
https://www.st.com/resource/en/application_note/an5200-getting-started-with-stm32h7-series-sdmmc-host-controller-stmicroelectronics.pdf

thanks to @HTD  I have a good starting point as he shared a blank project already configured.

Solved: STM32H745I-DISCO eMMC how to configure with FATFS? - STMicroelectronics Community

but how do you know what commands to use to use the eMMC? i.e. how do you usually find out how to do something in stm? i mean code.

[SofLit · Accepted solution]

Hello,

---

@Maximiliano wrote:

In examples of STM cube ide I found 2 examples, one with DMA and another with IT but not having a structure as in the projects it is difficult for me to understand it.

---

Which example you are pointing to?

This is an example from STM32H7 Cube package that you can refer to for eMMc/FatFs.

Save your structure as values in a text file.

PS: the driver (stm32h745i_discovery_mmc.c / stm32h745i_discovery_mmc.h) is located under Drivers\BSP\STM32H745I-DISCO.

[Maximiliano]

11:31:23 **** Incremental Build of configuration Debug for project FatFs_Shared_Device_CM7 ****
make -j8 all 
arm-none-eabi-gcc "C:/Users/maxi/Desktop/nuevo/PP/eMMC soft/STM32CubeH7-master/STM32CubeH7-master/Projects/STM32H745I-DISCO/Applications/FatFs/FatFs_Shared_Device/Common/Src/mmc_diskio.c" -mcpu=cortex-m7 -std=gnu11 -g3 -DDEBUG -DSTM32H745xx -DUSE_HAL_DRIVER -DUSE_PWR_DIRECT_SMPS_SUPPLY -DUSE_PWR_DIRECT_SMPS_SUPPLY -DUSE_STM32H745I_DISCO -DCORE_CM7 -c -I../../../Common/Inc -I../../../CM7/Inc -I../../../../../../../../Drivers/CMSIS/Include -I../../../../../../../../Drivers/CMSIS/Device/ST/STM32H7xx/Include -I../../../../../../../../Drivers/STM32H7xx_HAL_Driver/Inc -I../../../../../../../../Drivers/BSP/STM32H745I-DISCO -I../../../../../../../../Middlewares/Third_Party/FatFs/src -I../../../../../../../../Utilities/Fonts -O0 -ffunction-sections -fdata-sections -Wall -fstack-usage -fcyclomatic-complexity -MMD -MP -MF"Middleware/FatFs/Drivers/mmc_diskio.d" -MT"Middleware/FatFs/Drivers/mmc_diskio.o" --specs=nano.specs -mfpu=fpv5-d16 -mfloat-abi=hard -mthumb -o "Middleware/FatFs/Drivers/mmc_diskio.o"
make: *** No rule to make target 'C:/Users/maxi/Desktop/nuevo/PP/eMMC soft/STM32CubeH7-master/STM32CubeH7-master/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal.c', needed by 'Drivers/STM32H7xx_HAL_Driver/stm32h7xx_hal.o'.  Stop.
make: *** Waiting for unfinished jobs....
In file included from ../../../../../../../../Drivers/BSP/STM32H745I-DISCO/stm32h745i_discovery_mmc.h:29,
                 from ../../../Common/Inc/mmc_diskio.h:24,
                 from C:/Users/maxi/Desktop/nuevo/PP/eMMC soft/STM32CubeH7-master/STM32CubeH7-master/Projects/STM32H745I-DISCO/Applications/FatFs/FatFs_Shared_Device/Common/Src/mmc_diskio.c:21:
../../../Common/Inc/stm32h745i_discovery_conf.h:28:10: fatal error: stm32h7xx_hal.h: No such file or directory
   28 | #include "stm32h7xx_hal.h"
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Middleware/FatFs/Drivers/subdir.mk:19: Middleware/FatFs/Drivers/mmc_diskio.o] Error 1
"make -j8 all" terminated with exit code 2. Build might be incomplete.

11:31:24 Build Failed. 4 errors, 0 warnings. (took 465ms)

Thank you for your reply @SofLit !

I was referring to the following examples seen in STMcubeIDE

I understand that your code is like a template, I would have to pass it to a project created from 0 by me in stm32cubeIDE, right? because I copied the emmc.c and .h files that you indicate me and if I compile it I get the following message also does not have the .ioc as to see graphically the configuration. error code above (I don't know why I don't see it below)

When creating an oriyecto from 0 configuring it as it is in the HTD I missed in fatfs_m7 that I would not know what options to select.

I share the project to see if maybe I missed to configure something before or just the fatfs to be able to pass the emmcc and . h and what you passed me in the main.c and start debugging to understand the steps.

[SofLit]

There is no available project from scratch. You need to configure your ioc file by following the parameters in these examples.