src/class/cdc/cdc_device.h

/*
 * SPDX-FileCopyrightText: Copyright (c) 2019 Ha Thach (tinyusb.org)
 * SPDX-License-Identifier: MIT
 *
 * This file is part of the TinyUSB stack.
 */

#ifndef TUSB_CDC_DEVICE_H_
#define TUSB_CDC_DEVICE_H_

#include "cdc.h"

#ifdef __cplusplus
 extern "C" {
#endif

//--------------------------------------------------------------------+
// Class Driver Configuration
//--------------------------------------------------------------------+
#ifndef CFG_TUD_CDC_NOTIFY
  #define CFG_TUD_CDC_NOTIFY    0
#endif

#ifndef CFG_TUD_CDC_TX_BUFSIZE
  #define CFG_TUD_CDC_TX_BUFSIZE TUD_EPSIZE_BULK_MAX
#endif

#ifndef CFG_TUD_CDC_RX_BUFSIZE
  #define CFG_TUD_CDC_RX_BUFSIZE TUD_EPSIZE_BULK_MAX
#endif

// EP_BUFSIZE is separated to RX_EPSIZE and TX_EPSIZE
#ifndef CFG_TUD_CDC_RX_EPSIZE
  #ifdef CFG_TUD_CDC_EP_BUFSIZE
    #define CFG_TUD_CDC_RX_EPSIZE CFG_TUD_CDC_EP_BUFSIZE
  #else
    #define CFG_TUD_CDC_RX_EPSIZE TUD_EPSIZE_BULK_MAX
  #endif
#endif

#ifndef CFG_TUD_CDC_TX_EPSIZE
  #ifdef CFG_TUD_CDC_EP_BUFSIZE
    #define CFG_TUD_CDC_TX_EPSIZE  CFG_TUD_CDC_EP_BUFSIZE
  #else
    #define CFG_TUD_CDC_TX_EPSIZE TUD_EPSIZE_BULK_MAX
  #endif
#endif

// Enable multi-packet RX transfer with ZLP termination for better throughput. Requires host support for ZLP.
#ifndef CFG_TUD_CDC_RX_NEED_ZLP
  #define CFG_TUD_CDC_RX_NEED_ZLP 0
#endif

// Keep rx fifo data even with bus reset or disconnect
#ifndef CFG_TUD_CDC_RX_PERSISTENT
  #define CFG_TUD_CDC_RX_PERSISTENT 0
#endif

// Keep tx fifo data even with bus reset or disconnect
#ifndef CFG_TUD_CDC_TX_PERSISTENT
  #define CFG_TUD_CDC_TX_PERSISTENT 0
#endif

// If not connected, tx fifo can be overwritten
#ifndef CFG_TUD_CDC_TX_OVERWRITABLE_IF_NOT_CONNECTED
  #define CFG_TUD_CDC_TX_OVERWRITABLE_IF_NOT_CONNECTED 1
#endif

// Backward compatible: tud_cdc_configure_t and tud_cdc_configure() are no longer used.
// Configuration is now done via compile-time macros above.
typedef struct {
  bool rx_persistent;
  bool tx_persistent;
  bool tx_overwritabe_if_not_connected;
} tud_cdc_configure_t;

#define tud_cdc_configure(_cfg)          ((void)(_cfg))
#define tud_cdc_configure_fifo_t         tud_cdc_configure_t
#define tud_cdc_configure_fifo(_cfg)     ((void)(_cfg))

//--------------------------------------------------------------------+
// Application API (Multiple Ports) i.e. CFG_TUD_CDC > 1
//--------------------------------------------------------------------+

// Check if the interface is ready
bool tud_cdc_n_ready(uint8_t itf);

// Check if the terminal is connected to this port
bool tud_cdc_n_connected(uint8_t itf);

// Get the current line state. Bit 0:  DTR (Data Terminal Ready), Bit 1: RTS (Request to Send)
uint8_t tud_cdc_n_get_line_state(uint8_t itf);

// Get current line encoding: bit rate, stop bits parity etc ..
void tud_cdc_n_get_line_coding(uint8_t itf, cdc_line_coding_t* coding);

// Set special character that will trigger tud_cdc_rx_wanted_cb() callback on receiving
void tud_cdc_n_set_wanted_char(uint8_t itf, char wanted);

// Get the number of bytes available for reading
uint32_t tud_cdc_n_available(uint8_t itf);

// Read received bytes
uint32_t tud_cdc_n_read(uint8_t itf, void* buffer, uint32_t bufsize);

// Read a byte, return -1 if there is none
TU_ATTR_ALWAYS_INLINE static inline int32_t tud_cdc_n_read_char(uint8_t itf) {
  uint8_t ch;
  return tud_cdc_n_read(itf, &ch, 1) ? (int32_t) ch : -1;
}

// Clear the received FIFO
void tud_cdc_n_read_flush(uint8_t itf);

// Get a byte from FIFO without removing it
bool tud_cdc_n_peek(uint8_t itf, uint8_t* ui8);

// Write bytes to TX FIFO, data may remain in the FIFO for a while
uint32_t tud_cdc_n_write(uint8_t itf, void const* buffer, uint32_t bufsize);

// Write a byte
TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_n_write_char(uint8_t itf, char ch) {
  return tud_cdc_n_write(itf, &ch, 1);
}

// Write a null-terminated string
TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_n_write_str(uint8_t itf, char const* str) {
  return tud_cdc_n_write(itf, str, strlen(str));
}

// Force sending data if possible, return number of forced bytes
uint32_t tud_cdc_n_write_flush(uint8_t itf);

// Return the number of bytes (characters) available for writing to TX FIFO buffer in a single n_write operation.
uint32_t tud_cdc_n_write_available(uint8_t itf);

// Clear the TX FIFO
bool tud_cdc_n_write_clear(uint8_t itf);

#if CFG_TUD_CDC_NOTIFY
bool tud_cdc_n_notify_msg(uint8_t itf, cdc_notify_msg_t *msg);

// Send UART status notification: DCD, DSR etc ..
TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_n_notify_uart_state(uint8_t                        itf,
                                                                     const cdc_notify_uart_state_t *state) {
  cdc_notify_msg_t notify_msg;
  notify_msg.request.bmRequestType = CDC_REQ_TYPE_NOTIF;
  notify_msg.request.bRequest      = CDC_NOTIF_SERIAL_STATE;
  notify_msg.request.wValue        = 0;
  notify_msg.request.wIndex        = 0; // filled later
  notify_msg.request.wLength       = sizeof(cdc_notify_uart_state_t);
  notify_msg.serial_state          = *state;
  return tud_cdc_n_notify_msg(itf, &notify_msg);
}

// Send connection speed change notification
TU_ATTR_ALWAYS_INLINE static inline bool
tud_cdc_n_notify_conn_speed_change(uint8_t itf, const cdc_notify_conn_speed_change_t *conn_speed_change) {
  cdc_notify_msg_t notify_msg;
  notify_msg.request.bmRequestType = CDC_REQ_TYPE_NOTIF;
  notify_msg.request.bRequest      = CDC_NOTIF_CONNECTION_SPEED_CHANGE;
  notify_msg.request.wValue        = 0;
  notify_msg.request.wIndex        = 0; // filled later
  notify_msg.request.wLength       = sizeof(cdc_notify_conn_speed_change_t);
  notify_msg.conn_speed_change     = *conn_speed_change;
  return tud_cdc_n_notify_msg(itf, &notify_msg);
}

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_notify_msg(cdc_notify_msg_t *msg) {
  return tud_cdc_n_notify_msg(0, msg);
}

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_notify_uart_state(const cdc_notify_uart_state_t* state) {
 return tud_cdc_n_notify_uart_state(0, state);
}

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_notify_conn_speed_change(const cdc_notify_conn_speed_change_t* conn_speed_change) {
  return tud_cdc_n_notify_conn_speed_change(0, conn_speed_change);
}
#endif

//--------------------------------------------------------------------+
// Application API (Single Port)
//--------------------------------------------------------------------+

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_ready(void) {
  return tud_cdc_n_ready(0);
}

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_connected(void) {
  return tud_cdc_n_connected(0);
}

TU_ATTR_ALWAYS_INLINE static inline uint8_t tud_cdc_get_line_state(void) {
  return tud_cdc_n_get_line_state(0);
}

TU_ATTR_ALWAYS_INLINE static inline void tud_cdc_get_line_coding(cdc_line_coding_t* coding) {
  tud_cdc_n_get_line_coding(0, coding);
}

TU_ATTR_ALWAYS_INLINE static inline void tud_cdc_set_wanted_char(char wanted) {
  tud_cdc_n_set_wanted_char(0, wanted);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_available(void) {
  return tud_cdc_n_available(0);
}

TU_ATTR_ALWAYS_INLINE static inline int32_t tud_cdc_read_char(void) {
  return tud_cdc_n_read_char(0);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_read(void* buffer, uint32_t bufsize) {
  return tud_cdc_n_read(0, buffer, bufsize);
}

TU_ATTR_ALWAYS_INLINE static inline void tud_cdc_read_flush(void) {
  tud_cdc_n_read_flush(0);
}

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_peek(uint8_t* ui8) {
  return tud_cdc_n_peek(0, ui8);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_write_char(char ch) {
  return tud_cdc_n_write_char(0, ch);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_write(void const* buffer, uint32_t bufsize) {
  return tud_cdc_n_write(0, buffer, bufsize);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_write_str(char const* str) {
  return tud_cdc_n_write_str(0, str);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_write_flush(void) {
  return tud_cdc_n_write_flush(0);
}

TU_ATTR_ALWAYS_INLINE static inline uint32_t tud_cdc_write_available(void) {
  return tud_cdc_n_write_available(0);
}

TU_ATTR_ALWAYS_INLINE static inline bool tud_cdc_write_clear(void) {
  return tud_cdc_n_write_clear(0);
}

//--------------------------------------------------------------------+
// Application Callback API
//--------------------------------------------------------------------+

// Invoked when received new data
void tud_cdc_rx_cb(uint8_t itf);

// Invoked when received `wanted_char`
void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char);

// Invoked when a TX is complete and therefore space becomes available in TX buffer
void tud_cdc_tx_complete_cb(uint8_t itf);

// Invoked when a notification is sent to host
void tud_cdc_notify_complete_cb(uint8_t itf);

// Invoked when line state DTR & RTS are changed via SET_CONTROL_LINE_STATE
void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts);

// Invoked when line coding is change via SET_LINE_CODING
void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding);

// Invoked when received send break
// \param[in]  itf  interface for which send break was received.
// \param[in]  duration_ms  the length of time, in milliseconds, of the break signal. If a value of FFFFh, then the
//                          device will send a break until another SendBreak request is received with value 0000h.
void tud_cdc_send_break_cb(uint8_t itf, uint16_t duration_ms);

//--------------------------------------------------------------------+
// INTERNAL USBD-CLASS DRIVER API
//--------------------------------------------------------------------+
void     cdcd_init            (void);
bool     cdcd_deinit          (void);
void     cdcd_reset           (uint8_t rhport);
uint16_t cdcd_open            (uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
bool     cdcd_control_xfer_cb (uint8_t rhport, uint8_t stage, tusb_control_request_t const * request);
bool     cdcd_xfer_cb         (uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);

#ifdef __cplusplus
 }
#endif

#endif /* TUSB_CDC_DEVICE_H_ */