src/class/cdc/cdc_host.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_HOST_H_
#define TUSB_CDC_HOST_H_

#include "cdc.h"

#ifdef __cplusplus
extern "C" {
#endif

//--------------------------------------------------------------------+
// Class Driver Configuration
//--------------------------------------------------------------------+

// RX FIFO size
#ifndef CFG_TUH_CDC_RX_BUFSIZE
  #define CFG_TUH_CDC_RX_BUFSIZE TUH_EPSIZE_BULK_MAX
#endif

// RX Endpoint size
#ifndef CFG_TUH_CDC_RX_EPSIZE
  #define CFG_TUH_CDC_RX_EPSIZE TUH_EPSIZE_BULK_MAX
#endif

// TX FIFO size
#ifndef CFG_TUH_CDC_TX_BUFSIZE
  #define CFG_TUH_CDC_TX_BUFSIZE TUH_EPSIZE_BULK_MAX
#endif

// TX Endpoint size
#ifndef CFG_TUH_CDC_TX_EPSIZE
  #define CFG_TUH_CDC_TX_EPSIZE TUH_EPSIZE_BULK_MAX
#endif

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

// Get Interface index from device address + interface number
// return TUSB_INDEX_INVALID_8 (0xFF) if not found
uint8_t tuh_cdc_itf_get_index(uint8_t daddr, uint8_t itf_num);

// Get Interface information
// return true if index is correct and interface is currently mounted
bool tuh_cdc_itf_get_info(uint8_t idx, tuh_itf_info_t *info);

// Check if an interface is mounted
bool tuh_cdc_mounted(uint8_t idx);

// Get local (cached) line state
// This function should return correct values if tuh_cdc_set_control_line_state() / tuh_cdc_get_control_line_state()
// are invoked previously or CFG_TUH_CDC_LINE_STATE_ON_ENUM is defined.
bool tuh_cdc_get_control_line_state_local(uint8_t idx, uint16_t *line_state);

// Get current DTR status
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_get_dtr(uint8_t idx) {
  uint16_t line_state;
  TU_VERIFY(tuh_cdc_get_control_line_state_local(idx, &line_state));
  return (line_state & CDC_CONTROL_LINE_STATE_DTR) != 0;
}

// Get current RTS status
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_get_rts(uint8_t idx) {
  uint16_t line_state;
  TU_VERIFY(tuh_cdc_get_control_line_state_local(idx, &line_state));
  return (line_state & CDC_CONTROL_LINE_STATE_RTS) != 0;
}

// Check if interface is connected (DTR active)
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_connected(uint8_t idx) {
  return tuh_cdc_get_dtr(idx);
}

// Get local (saved/cached) version of line coding.
// This function should return correct values if tuh_cdc_set_line_coding() / tuh_cdc_get_line_coding()
// are invoked previously or CFG_TUH_CDC_LINE_CODING_ON_ENUM is defined.
// NOTE: This function does not make any USB transfer request to device.
bool tuh_cdc_get_line_coding_local(uint8_t idx, cdc_line_coding_t *line_coding);

#define tuh_cdc_get_local_line_coding tuh_cdc_get_line_coding_local // backward compatibility

//--------------------------------------------------------------------+
// Write API
//--------------------------------------------------------------------+

// Get the number of bytes available for writing
uint32_t tuh_cdc_write_available(uint8_t idx);

// Write to cdc interface
uint32_t tuh_cdc_write(uint8_t idx, const void *buffer, uint32_t bufsize);

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

// Clear the transmit FIFO
bool tuh_cdc_write_clear(uint8_t idx);

//--------------------------------------------------------------------+
// Read API
//--------------------------------------------------------------------+

// Get the number of bytes available for reading
uint32_t tuh_cdc_read_available(uint8_t idx);

// Read from cdc interface
uint32_t tuh_cdc_read(uint8_t idx, void *buffer, uint32_t bufsize);

// Get a byte from RX FIFO without removing it
bool tuh_cdc_peek(uint8_t idx, uint8_t *ch);

// Clear the received FIFO
bool tuh_cdc_read_clear(uint8_t idx);

//--------------------------------------------------------------------+
// Control Request API
// Each Function will make a USB control transfer request to/from device
// - If complete_cb is provided, the function will return immediately and invoke
// the callback when request is complete.
// - If complete_cb is NULL, the function will block until request is complete.
// In this case, user_data should be usb_xfer_result_t* to hold the transfer result.
//--------------------------------------------------------------------+

// Request to Set Control Line State: DTR (bit 0), RTS (bit 1)
bool tuh_cdc_set_control_line_state(uint8_t idx, uint16_t line_state, tuh_xfer_cb_t complete_cb, uintptr_t user_data);

// Request to Set DTR
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_set_dtr(uint8_t idx, bool dtr_state, tuh_xfer_cb_t complete_cb,
                                                         uintptr_t user_data) {
  cdc_line_control_state_t line_state = {.dtr = dtr_state};
  line_state.rts                      = tuh_cdc_get_rts(idx);
  return tuh_cdc_set_control_line_state(idx, line_state.value, complete_cb, user_data);
}

// Request to Set RTS
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_set_rts(uint8_t idx, bool rts_state, tuh_xfer_cb_t complete_cb,
                                                         uintptr_t user_data) {
  cdc_line_control_state_t line_state = {.rts = rts_state};
  line_state.dtr                      = tuh_cdc_get_dtr(idx);
  return tuh_cdc_set_control_line_state(idx, line_state.value, complete_cb, user_data);
}

// Request to set baudrate
bool tuh_cdc_set_baudrate(uint8_t idx, uint32_t baudrate, tuh_xfer_cb_t complete_cb, uintptr_t user_data);

// Request to set data format
bool tuh_cdc_set_data_format(uint8_t idx, uint8_t stop_bits, uint8_t parity, uint8_t data_bits,
                             tuh_xfer_cb_t complete_cb, uintptr_t user_data);

// Request to Set Line Coding = baudrate + data format
// Note: only implemented by ACM and CH34x, not supported by FTDI and CP210x yet
bool tuh_cdc_set_line_coding(uint8_t idx, const cdc_line_coding_t *line_coding, tuh_xfer_cb_t complete_cb,
                             uintptr_t user_data);

// Request to Get Line Coding (ACM only)
// Should only use if tuh_cdc_set_line_coding() / tuh_cdc_get_line_coding() never got invoked and
// CFG_TUH_CDC_LINE_CODING_ON_ENUM is not defined
// bool tuh_cdc_get_line_coding(uint8_t idx, cdc_line_coding_t* coding);

// Connect by set both DTR, RTS
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_connect(uint8_t idx, tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
  return tuh_cdc_set_control_line_state(idx, CDC_CONTROL_LINE_STATE_DTR | CDC_CONTROL_LINE_STATE_RTS, complete_cb,
                                        user_data);
}

// Disconnect by clear both DTR, RTS
TU_ATTR_ALWAYS_INLINE static inline bool tuh_cdc_disconnect(uint8_t idx, tuh_xfer_cb_t complete_cb,
                                                            uintptr_t user_data) {
  return tuh_cdc_set_control_line_state(idx, 0x00, complete_cb, user_data);
}

//--------------------------------------------------------------------+
// Control Request Sync API
// Each Function will make a USB control transfer request to/from device the function will block until request is
// complete. The function will return the transfer request result
//--------------------------------------------------------------------+
TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_set_control_line_state_sync(uint8_t  idx,
                                                                                           uint16_t line_state) {
  TU_API_SYNC(tuh_cdc_set_control_line_state, idx, line_state);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_set_dtr_sync(uint8_t idx, bool dtr_state) {
  TU_API_SYNC(tuh_cdc_set_dtr, idx, dtr_state);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_set_rts_sync(uint8_t idx, bool rts_state) {
  TU_API_SYNC(tuh_cdc_set_rts, idx, rts_state);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_set_baudrate_sync(uint8_t idx, uint32_t baudrate) {
  TU_API_SYNC(tuh_cdc_set_baudrate, idx, baudrate);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_set_data_format_sync(uint8_t idx, uint8_t stop_bits,
                                                                                    uint8_t parity, uint8_t data_bits) {
  TU_API_SYNC(tuh_cdc_set_data_format, idx, stop_bits, parity, data_bits);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t
tuh_cdc_set_line_coding_sync(uint8_t idx, const cdc_line_coding_t *line_coding) {
  TU_API_SYNC(tuh_cdc_set_line_coding, idx, line_coding);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_connect_sync(uint8_t idx) {
  TU_API_SYNC(tuh_cdc_connect, idx);
}

TU_ATTR_ALWAYS_INLINE static inline tusb_xfer_result_t tuh_cdc_disconnect_sync(uint8_t idx) {
  TU_API_SYNC(tuh_cdc_disconnect, idx);
}

//--------------------------------------------------------------------+
// CDC APPLICATION CALLBACKS
//--------------------------------------------------------------------+

// Invoked when a device with CDC interface is mounted
// idx is index of cdc interface in the internal pool.
extern void tuh_cdc_mount_cb(uint8_t idx);

// Invoked when a device with CDC interface is unmounted
extern void tuh_cdc_umount_cb(uint8_t idx);

// Invoked when received new data
extern void tuh_cdc_rx_cb(uint8_t idx);

// Invoked when a TX is complete and therefore space becomes available in TX buffer
extern void tuh_cdc_tx_complete_cb(uint8_t idx);

//--------------------------------------------------------------------+
// Internal Class Driver API
//--------------------------------------------------------------------+
bool     cdch_init(void);
bool     cdch_deinit(void);
uint16_t cdch_open(uint8_t rhport, uint8_t dev_addr, const tusb_desc_interface_t *itf_desc, uint16_t max_len);
bool     cdch_set_config(uint8_t dev_addr, uint8_t itf_num);
bool     cdch_xfer_cb(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes);
void     cdch_close(uint8_t dev_addr);

#ifdef __cplusplus
}
#endif

#endif /* TUSB_CDC_HOST_H_ */