Skip to main content
wjian.2
wjian.2
Associate III
July 28, 2023
Question

stm32h747i-disco writegpio no funtion

  • July 28, 2023
  • 3 replies
  • 2384 views

i want to add some work on food_recognize.c in fp_AI_VISION ,I want to use CN9 analog to control some leds but it doesn't work in first place. I can't control those pins with writegipo.

so far i only see A0 always on and A1-A5 always off. On the same pin there are two names (from gpio port and mcu pin), for example A2 can be PA0 or PI6, but try both that don't work, I've also tried mcu pin with pinnbr either. A0 always on and the rest always off, no I know which part is wrong (PLL or System Clock Configuration? this part also changes sometimes either) , I have attached the example main.c  if anywhere has a problem.

3 replies

TDK
TDK
July 28, 2023

If you want pins on A0-A3 to be outputs, you need to initialize them as outputs first. You don't do that anywhere in your code. You only initialize PI4 as an output.

Feels like you generated CubeMX code, then modified it. Comments and code are not in alignment. One example of many:

 

 /* Set the output value of PA0 and PC3 */
 HAL_GPIO_WritePin(GPIOI, GPIO_PIN_4, GPIO_PIN_SET);

 

PI4 is connected to memory and doesn't appear in CN9, so why are you changing it?

TDK_0-1690550632321.png

Note that PA0 and PA0_C are different pins. PA0_C can't be an output unless it's tied to PA0 internally.

"If you feel a post has answered your question, please click ""Accept as Solution""."
wjian.2
wjian.2Author
Associate III
July 30, 2023

Because the same pin hay differente name in mcu pin and gpio port,like A2 as PA0_C and PI6 , the problem is those pines A1-A5 in the two name always off(i have try 6 pin ,12 name), A0 always on.

wjian2_0-1690715581520.png

 

Piranha
Piranha
Principal III
July 28, 2023

Arduino pin numbering has nothing to do with STM32 pin numbers. According to the schematic A0 on CN9 is connected to PA4, but the UM2411 user manual shows PF7. I would guess the user manual is wrong. The author can test it easily...

@KDJEM.1 , this is a documentation error.

wjian.2
wjian.2Author
Associate III
July 30, 2023

i try the command 

/* Enable GPIOA and GPIOC clock */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOI_CLK_ENABLE();
__HAL_RCC_GPIOF_CLK_ENABLE();

/* Configure PA0 and PC3 as outputs */
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_4;
//GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

 

/* Set the output value of PA4 */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);

and in main

 
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
HAL_Delay(1000);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);
HAL_Delay(1000);

Pin A0 always on

 

 

KDJEM.1
KDJEM.1
ST Technical Moderator
March 27, 2024

Hello,

The issue is solved in UM2411 Rev 6.

Thank you.

Kaouthar

To give better visibility on the answered topics, please click on "Best answer" on the reply which solved your issue or answered your question.
Terms & ConditionsAccessibility statement