Posted on April 23, 2015 at 03:20The function (as defined in usbd_cdc.c)
uint8_t
USBD_CDC_TransmitPacket(USBD_HandleTypeDef *pdev)
in fact returns values of type
USBD_StatusTypeDef,
not
uint8_t
.
This causes type collisions, and IAR warnings of the form ''enumerated type mixed with another type'' if one does something like this:
USBD_HandleTypeDef handle;
USBD_StatusTypeDef result;
...
result = USBD_CDC_TransmitPacket(&handle)
It would be nice if the types returned by a function match the return type of the function. :)
Affected files are
...\STM32Cube_FW_F4_V1.5.0\Middlewares\ST\STM32_USB_Device_Library\Class\CDC\Src\usbd_cdc.c (definition)
...\STM32Cube_FW_F4_V1.5.0\Middlewares\ST\STM32_USB_Device_Library\Class\CDC\Inc\usbd_cdc.h (declaration)
This may occur elsewhere in the HAL, but this is one I have encountered. I did not perform an exhaustive check. I presume a lint-like checker would locate similar problems if they exist.
This problem exists in 1.4.0 as well.
