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BTurc.2
BTurc.2
Senior
May 23, 2023
Solved

How it works the return??

  • May 23, 2023
  • 5 replies
  • 1995 views

Hello all,

I'm using the HAL library for the camera, specifically I'm using the function:

 HAL_StatusTypeDef HAL_DCMI_Start_DMA(DCMI_HandleTypeDef *hdcmi, uint32_t DCMI_Mode, uint32_t pData, uint32_t Length)

In the function are many return HAL_ERROR, and one HAL_OK. When the function works fine It return a 0, but when I have an error it return 2.

Why It retuns 2 if the HAL_ERROR is defined as 1 when I have an error.

This topic has been closed for replies.
Best answer by LCE

I think 2 is busy:

typedef enum
{
 HAL_OK = 0x00U,
 HAL_ERROR = 0x01U,
 HAL_BUSY = 0x02U,
 HAL_TIMEOUT = 0x03U
} HAL_StatusTypeDef;

5 replies

LCE
LCEBest answer
Principal II
May 23, 2023

I think 2 is busy:

typedef enum
{
 HAL_OK = 0x00U,
 HAL_ERROR = 0x01U,
 HAL_BUSY = 0x02U,
 HAL_TIMEOUT = 0x03U
} HAL_StatusTypeDef;

BTurc.2
BTurc.2Author
Senior
May 23, 2023

Ohh, Okey, I see that a function inside could return a HAL_BUSY, but the main function only could return HAL_OK and HAL_ERROR, so why It return the HAL_BUSY??. The return of the subfunction is only used in the subfunction no??

LCE
LCE
Principal II
May 23, 2023

I don't know that function.

Check it again, then debug it.

Mike_ST
Mike_ST
ST Technical Moderator
May 23, 2023

Hello,

if you have:

status = function(...);

and later you have

return status;

then status might be the return value of the sub-function.

As LCE wrote, please use the debugger so you can better understand where you get HAL_BUSY.

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. 
BTurc.2
BTurc.2Author
Senior
May 23, 2023

I will try to debug it! Thanks for the help!

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