usb_link.h

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#ifndef USB_LINK_H
#define USB_LINK_H
 
#include <stdint.h>
#include <stddef.h>
 
#define USBL_RX_SIZE   1024u
#define USBL_TX_SIZE   4096u    
#define USBL_CMD_MAX   32u
#define USBL_OPEN_MS   3000u    
enum { USBL_SRC_LOG = 0, USBL_SRC_APP = 1, USBL_SRC_TLM = 2, USBL_SRC_COUNT };
 
void     usbl_reset(void);
 
/* ---- USB interrupt / board binding ---- */
void     usbl_rx_isr(const uint8_t *p, uint32_t n);   
void     usbl_set_configured(uint8_t on);
void     usbl_set_dtr(uint8_t on);
 
/* ---- any task ---- */
uint8_t  usbl_host(void);
uint8_t  usbl_open(uint32_t now_ms);
 
/* ---- LogTask (RX consumer) ---- */
uint32_t usbl_poll(uint8_t *cmd, uint32_t cap, uint32_t now_ms);
uint32_t usbl_rx_errors(void);                       
/* ---- producers (one task per source) ---- */
uint32_t usbl_tx_free_src(uint8_t src);
int      usbl_send_src(uint8_t src, uint8_t type, const void *payload, uint8_t len);
int      usbl_put_frame(uint8_t src, const uint8_t *frame, uint32_t n);
static inline uint32_t usbl_tx_free(void) { return usbl_tx_free_src(USBL_SRC_LOG); }
static inline int usbl_send(uint8_t type, const void *payload, uint8_t len) { return usbl_send_src(USBL_SRC_LOG, type, payload, len); }
uint32_t usbl_tx_dropped(uint8_t src);               
/* ---- board binding (one consumer, the LogTask) ---- */
uint32_t usbl_tx_peek(uint8_t *buf, uint32_t cap);
void     usbl_tx_consume(uint32_t n);
void     usbl_tx_flush(void);
 
#endif /* USB_LINK_H */