Is there a potential bug in HAL_StatusTypeDef enum definition?

[themole]

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

This is the actual defintion of the HAL_StatusTypeDef. Other status codes are defined in other modules headers like this:

#define HAL_CAN_ERROR_TIMEOUT (0x00020000U)

In System Workbench, using GCC, this leads to the following warning, as soon as you check against that specific ERROR:

...Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_can.h:269:39: warning: large integer implicitly truncated to unsigned type [-Woverflow]

At first, it is only a warning but I would expect, that it will lead to wired problems, if you try to handle errors correctly.

I suggest, simply adding a dummy value to the enum typedef to force GCC to choose an integer type of the appropriate size like this in stm32f4xx_hal_def.h:

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

[S.Ma]

stm32f4xx_hal_can.h:269

typedef struct __CAN_HandleTypeDef

{

 CAN_TypeDef         *Instance;         /*!< Register base address */

 CAN_InitTypeDef       Init;           /*!< CAN required parameters */

 __IO HAL_CAN_StateTypeDef  State;           /*!< CAN communication state */

 __IO uint32_t        ErrorCode;         /*!< CAN Error code.

This is not HAL_StatusTypeDef

Have you tried

#define HAL_CAN_ERROR_TIMEOUT    ((uint32_t) (0x00020000U))

to check the compiler warning?

[themole]

HAL_StatusTypeDef BSP_CAN_ReceiveMessage(
		CAN_RxHeaderTypeDef* canHeader, uint8_t* canData, uint32_t timeout) 
{
	HAL_StatusTypeDef canStatus = HAL_ERROR;
	uint32_t startTime = HAL_GetTick(), endTime;
	endTime = startTime + timeout;
 
	while(HAL_GetTick() < endTime) {
		canStatus = HAL_CAN_GetRxMessage(
				&hcan1, CAN_RX_FIFO0, canHeader, canData);
		if(canStatus == HAL_OK)
			return canStatus;
	}
	return canStatus;
}
 
//.... and here comes the problematic part...
do {
	status = BSP_CAN_ReceiveMessage(&header, &data, 1000);
} while((status == HAL_CAN_ERROR_TIMEOUT) && (++i < 10)); 
//....

After digging a bit around, I realized, that HAL_CAN_GetRxMessage() is never assigning the timeout error constant to the Status type :(