Conquering the STM32F4 on the discovery board step-by-step. Commit history is tutorialesque, but not clean of course.
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#ifndef __USBD_CONF__H__
#define __USBD_CONF__H__
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "stm32f4xx.h"
#include "stm32f4xx_hal.h"
/*---------- -----------*/
#define USBD_MAX_NUM_INTERFACES 1U
/*---------- -----------*/
#define USBD_MAX_NUM_CONFIGURATION 1U
/*---------- -----------*/
#define USBD_MAX_STR_DESC_SIZ 512U
/*---------- -----------*/
#define USBD_DEBUG_LEVEL 0U
/*---------- -----------*/
#define USBD_LPM_ENABLED 0U
/*---------- -----------*/
#define USBD_SELF_POWERED 1U
#define DEVICE_FS 0
#define DEVICE_HS 1
#define USBD_malloc (void *)USBD_static_malloc
#define USBD_free USBD_static_free
#define USBD_memset memset
#define USBD_memcpy memcpy
#define USBD_Delay HAL_Delay
#if (USBD_DEBUG_LEVEL > 0)
#define USBD_UsrLog(...) \
printf(__VA_ARGS__); \
printf("\n");
#else
#define USBD_UsrLog(...)
#endif /* (USBD_DEBUG_LEVEL > 0U) */
#if (USBD_DEBUG_LEVEL > 1)
#define USBD_ErrLog(...) \
printf("ERROR: "); \
printf(__VA_ARGS__); \
printf("\n");
#else
#define USBD_ErrLog(...)
#endif /* (USBD_DEBUG_LEVEL > 1U) */
#if (USBD_DEBUG_LEVEL > 2)
#define USBD_DbgLog(...) \
printf("DEBUG : "); \
printf(__VA_ARGS__); \
printf("\n");
#else
#define USBD_DbgLog(...)
#endif /* (USBD_DEBUG_LEVEL > 2U) */
void *USBD_static_malloc(uint32_t size);
void USBD_static_free(void *p);
#ifdef __cplusplus
}
#endif
#endif /* __USBD_CONF__H__ */