text: /*
   * Copyright (C) 2017 C-SKY Microsystems Co., Ltd. All rights reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /******************************************************************************
   * @file     drv_usart.h
   * @brief    header file for usart driver
   * @version  V1.0
   * @date     02. June 2017
   ******************************************************************************/
  
  #ifndef _CSI_USART_H_
  #define _CSI_USART_H_
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include <drv_common.h>
  
  /// definition for usart handle.
  typedef void *usart_handle_t;
  
  /****** USART specific error codes *****/
  typedef enum {
      EDRV_USART_MODE  = (EDRV_SPECIFIC + 1),      ///< Specified Mode not supported
      EDRV_USART_BAUDRATE,                         ///< Specified baudrate not supported
      EDRV_USART_DATA_BITS,                        ///< Specified number of Data bits not supported
      EDRV_USART_PARITY,                           ///< Specified Parity not supported
      EDRV_USART_STOP_BITS,                        ///< Specified number of Stop bits not supported
      EDRV_USART_FLOW_CONTROL,                     ///< Specified Flow Control not supported
      EDRV_USART_CPOL,                             ///< Specified Clock Polarity not supported
      EDRV_USART_CPHA                              ///< Specified Clock Phase not supported
  } drv_usart_error_e;
  
  /*----- USART Control Codes: Mode -----*/
  typedef enum {
      USART_MODE_ASYNCHRONOUS         = 0,   ///< USART (Asynchronous)
      USART_MODE_SYNCHRONOUS_MASTER      ,   ///< Synchronous Master
      USART_MODE_SYNCHRONOUS_SLAVE       ,   ///< Synchronous Slave (external clock signal)
      USART_MODE_SINGLE_WIRE             ,    ///< USART Single-wire (half-duplex)
      USART_MODE_SINGLE_IRDA             ,    ///< UART IrDA
      USART_MODE_SINGLE_SMART_CARD       ,    ///< UART Smart Card
  } usart_mode_e;
  
  /*----- USART Control Codes: Mode Parameters: Data Bits -----*/
  typedef enum {
      USART_DATA_BITS_5             = 0,    ///< 5 Data bits
      USART_DATA_BITS_6                ,    ///< 6 Data bit
      USART_DATA_BITS_7                ,    ///< 7 Data bits
      USART_DATA_BITS_8                ,    ///< 8 Data bits (default)
      USART_DATA_BITS_9                     ///< 9 Data bits
  } usart_data_bits_e;
  
  /*----- USART Control Codes: Mode Parameters: Parity -----*/
  typedef enum {
      USART_PARITY_NONE            = 0,       ///< No Parity (default)
      USART_PARITY_EVEN               ,       ///< Even Parity
      USART_PARITY_ODD                ,       ///< Odd Parity
      USART_PARITY_1                  ,       ///< Parity forced to 1
      USART_PARITY_0                          ///< Parity forced to 0
  } usart_parity_e;
  
  /*----- USART Control Codes: Mode Parameters: Stop Bits -----*/
  typedef enum {
      USART_STOP_BITS_1            = 0,    ///< 1 Stop bit (default)
      USART_STOP_BITS_2               ,    ///< 2 Stop bits
      USART_STOP_BITS_1_5             ,    ///< 1.5 Stop bits
      USART_STOP_BITS_0_5                  ///< 0.5 Stop bits
  } usart_stop_bits_e;
  
  /*----- USART Control Codes: Mode Parameters: Clock Polarity (Synchronous mode) -----*/
  typedef enum {
      USART_CPOL0                  = 0,    ///< CPOL = 0 (default). data are captured on rising edge (low->high transition)
      USART_CPOL1                          ///< CPOL = 1. data are captured on falling edge (high->lowh transition)
  } usart_cpol_e;
  
  /*----- USART Control Codes: Mode Parameters: Clock Phase (Synchronous mode) -----*/
  typedef enum {
      USART_CPHA0                  = 0,   ///< CPHA = 0 (default). sample on first (leading) edge
      USART_CPHA1                         ///< CPHA = 1. sample on second (trailing) edge
  } usart_cpha_e;
  
  /*----- USART Control Codes: flush data type-----*/
  typedef enum {
      USART_FLUSH_WRITE,
      USART_FLUSH_READ
  } usart_flush_type_e;
  
  /*----- USART Control Codes: flow control type-----*/
  typedef enum {
      USART_FLOWCTRL_NONE,
      USART_FLOWCTRL_CTS,
      USART_FLOWCTRL_RTS,
      USART_FLOWCTRL_CTS_RTS
  } usart_flowctrl_type_e;
  
  /*----- USART Modem Control -----*/
  typedef enum {
      USART_RTS_CLEAR,                  ///< Deactivate RTS
      USART_RTS_SET,                    ///< Activate RTS
      USART_DTR_CLEAR,                  ///< Deactivate DTR
      USART_DTR_SET                     ///< Activate DTR
  } usart_modem_ctrl_e;
  
  /*----- USART Modem Status -----*/
  typedef struct {
    uint32_t cts : 1;                     ///< CTS state: 1=Active, 0=Inactive
    uint32_t dsr : 1;                     ///< DSR state: 1=Active, 0=Inactive
    uint32_t dcd : 1;                     ///< DCD state: 1=Active, 0=Inactive
    uint32_t ri  : 1;                     ///< RI  state: 1=Active, 0=Inactive
  } usart_modem_stat_t;
  
  /*----- USART Control Codes: on-off intrrupte type-----*/
  typedef enum {
      USART_INTR_WRITE,
      USART_INTR_READ
  } usart_intr_type_e;
  
  /**
  \brief USART Status
  */
  typedef struct  {
      uint32_t tx_busy          : 1;        ///< Transmitter busy flag
      uint32_t rx_busy          : 1;        ///< Receiver busy flag
      uint32_t tx_underflow     : 1;        ///< Transmit data underflow detected (cleared on start of next send operation)(Synchronous Slave)
      uint32_t rx_overflow      : 1;        ///< Receive data overflow detected (cleared on start of next receive operation)
      uint32_t rx_break         : 1;        ///< Break detected on receive (cleared on start of next receive operation)
      uint32_t rx_framing_error : 1;        ///< Framing error detected on receive (cleared on start of next receive operation)
      uint32_t rx_parity_error  : 1;        ///< Parity error detected on receive (cleared on start of next receive operation)
  } usart_status_t;
  
  /****** USART Event *****/
  typedef enum {
      USART_EVENT_SEND_COMPLETE       = 0,  ///< Send completed; however USART may still transmit data
      USART_EVENT_RECEIVE_COMPLETE    = 1,  ///< Receive completed
      USART_EVENT_TRANSFER_COMPLETE   = 2,  ///< Transfer completed
      USART_EVENT_TX_COMPLETE         = 3,  ///< Transmit completed (optional)
      USART_EVENT_TX_UNDERFLOW        = 4,  ///< Transmit data not available (Synchronous Slave)
      USART_EVENT_RX_OVERFLOW         = 5,  ///< Receive data overflow
      USART_EVENT_RX_TIMEOUT          = 6,  ///< Receive character timeout (optional)
      USART_EVENT_RX_BREAK            = 7,  ///< Break detected on receive
      USART_EVENT_RX_FRAMING_ERROR    = 8,  ///< Framing error detected on receive
      USART_EVENT_RX_PARITY_ERROR     = 9,  ///< Parity error detected on receive
      USART_EVENT_CTS                 = 10, ///< CTS state changed (optional)
      USART_EVENT_DSR                 = 11, ///< DSR state changed (optional)
      USART_EVENT_DCD                 = 12, ///< DCD state changed (optional)
      USART_EVENT_RI                  = 13, ///< RI  state changed (optional)
      USART_EVENT_RECEIVED            = 14,  ///< Received data, but no send()/receive()/transfer() called
  } usart_event_e;
  
  typedef void (*usart_event_cb_t)(usart_event_e event, void *cb_arg);   ///< Pointer to \ref usart_event_cb_t : USART Event call back.
  
  /**
  \brief USART Driver Capabilities.
  */
  typedef struct  {
      uint32_t asynchronous       : 1;      ///< supports UART (Asynchronous) mode
      uint32_t synchronous_master : 1;      ///< supports Synchronous Master mode
      uint32_t synchronous_slave  : 1;      ///< supports Synchronous Slave mode
      uint32_t single_wire        : 1;      ///< supports UART Single-wire mode
      uint32_t irda               : 1;      ///< supports UART IrDA mode
      uint32_t smart_card         : 1;      ///< supports UART Smart Card mode
      uint32_t smart_card_clock   : 1;      ///< Smart Card Clock generator available
      uint32_t flow_control_rts   : 1;      ///< RTS Flow Control available
      uint32_t flow_control_cts   : 1;      ///< CTS Flow Control available
      uint32_t event_tx_complete  : 1;      ///< Transmit completed event: \ref ARM_USART_EVENT_TX_COMPLETE
      uint32_t event_rx_timeout   : 1;      ///< Signal receive character timeout event: \ref ARM_USART_EVENT_RX_TIMEOUT
      uint32_t rts                : 1;      ///< RTS Line: 0=not available, 1=available
      uint32_t cts                : 1;      ///< CTS Line: 0=not available, 1=available
      uint32_t dtr                : 1;      ///< DTR Line: 0=not available, 1=available
      uint32_t dsr                : 1;      ///< DSR Line: 0=not available, 1=available
      uint32_t dcd                : 1;      ///< DCD Line: 0=not available, 1=available
      uint32_t ri                 : 1;      ///< RI Line: 0=not available, 1=available
      uint32_t event_cts          : 1;      ///< Signal CTS change event: \ref ARM_USART_EVENT_CTS
      uint32_t event_dsr          : 1;      ///< Signal DSR change event: \ref ARM_USART_EVENT_DSR
      uint32_t event_dcd          : 1;      ///< Signal DCD change event: \ref ARM_USART_EVENT_DCD
      uint32_t event_ri           : 1;      ///< Signal RI change event: \ref ARM_USART_EVENT_RI
  } usart_capabilities_t;
  
  /**
    \brief       Initialize USART Interface. 1. Initializes the resources needed for the USART interface 2.registers event callback function
    \param[in]   tx usart pin of tx
    \param[in]   rx usart pin of rx
    \param[in]   cb_event  Pointer to \ref usart_event_cb_t
    \param[in]   cb_arg    argument for cb_event
    \return      return usart handle if success
  */
  usart_handle_t csi_usart_initialize(pin_t tx, pin_t rx, usart_event_cb_t cb_event, void *cb_arg);
  
  /**
    \brief       De-initialize USART Interface. stops operation and releases the software resources used by the interface
    \param[in]   handle  usart handle to operate.
    \return      error code
  */
  int32_t csi_usart_uninitialize(usart_handle_t handle);
  /**
    \brief       Get driver capabilities.
    \param[in]   handle  usart handle to operate.
    \return      \ref usart_capabilities_t
  */
  usart_capabilities_t csi_usart_get_capabilities(usart_handle_t handle);
  
  /**
    \brief       config usart mode.
    \param[in]   handle  usart handle to operate.
    \param[in]   sysclk    system clock.
    \param[in]   baud      baud rate.
    \param[in]   mode      \ref usart_mode_e .
    \param[in]   parity    \ref usart_parity_e .
    \param[in]   stopbits  \ref usart_stop_bits_e .
    \param[in]   bits      \ref usart_data_bits_e .
    \return      error code
  */
  int32_t csi_usart_config(usart_handle_t handle,
                           uint32_t sysclk,
                           uint32_t baud,
                           usart_mode_e mode,
                           usart_parity_e parity,
                           usart_stop_bits_e stopbits,
                           usart_data_bits_e bits);
  
  /**
    \brief       config usart default tx value. used in synchronous mode
    \param[in]   handle  usart handle to operate.
    \param[in]   value  default tx value
    \return      error code
  */
  int32_t csi_usart_set_default_tx_value(usart_handle_t handle, uint32_t value);
  
  /**
    \brief       Start sending data to USART transmitter,(received data is ignored).
                 This function is non-blocking,\ref usart_event_e is signaled when operation completes or error happens.
                 \ref csi_usart_get_status can indicates operation status.
    \param[in]   handle  usart handle to operate.
    \param[in]   data  Pointer to buffer with data to send to USART transmitter. data_type is : uint8_t for 5..8 data bits, uint16_t for 9 data bits
    \param[in]   num   Number of data items to send
    \return      error code
  */
  int32_t csi_usart_send(usart_handle_t handle, const void *data, uint32_t num/*,bool asynch*/);
  
  /**
    \brief       Abort Send data to USART transmitter
    \param[in]   handle  usart handle to operate.
    \return      error code
  */
  int32_t csi_usart_abort_send(usart_handle_t handle);
  
  /**
    \brief       Start receiving data from USART receiver.transmits the default value as specified by csi_usart_set_default_tx_value. \n
                 This function is non-blocking,\ref usart_event_e is signaled when operation completes or error happens.
                 \ref csi_usart_get_status can indicates operation status.
    \param[in]   handle  usart handle to operate.
    \param[out]  data  Pointer to buffer for data to receive from USART receiver.data_type is : uint8_t for 5..8 data bits, uint16_t for 9 data bits
    \param[in]   num   Number of data items to receive
    \return      error code
  */
  int32_t csi_usart_receive(usart_handle_t handle, void *data, uint32_t num/*,bool asynch*/);
  
  /**
    \brief       query data from UART receiver FIFO.
    \param[in]   handle  usart handle to operate.
    \param[out]  data  Pointer to buffer for data to receive from UART receiver
    \param[in]   num   Number of data items to receive
    \return      receive fifo data num
  */
  int32_t csi_usart_receive_query(usart_handle_t handle, void *data, uint32_t num/*,bool asynch*/);
  
  /**
    \brief       Abort Receive data from USART receiver
    \param[in]   handle  usart handle to operate.
    \return      error code
  */
  int32_t csi_usart_abort_receive(usart_handle_t handle);
  
  /**
    \brief       Start synchronously sends data to the USART transmitter and receives data from the USART receiver. used in synchronous mode
                 This function is non-blocking,\ref usart_event_e is signaled when operation completes or error happens.
                 \ref csi_usart_get_status can indicates operation status.
    \param[in]   handle  usart handle to operate.
    \param[in]   data_out  Pointer to buffer with data to send to USART transmitter.data_type is : uint8_t for 5..8 data bits, uint16_t for 9 data bits
    \param[out]  data_in   Pointer to buffer for data to receive from USART receiver.data_type is : uint8_t for 5..8 data bits, uint16_t for 9 data bits
    \param[in]   num       Number of data items to transfer
    \return      error code
  */
  int32_t csi_usart_transfer(usart_handle_t handle, const void *data_out, void *data_in, uint32_t num/*,bool asynch*/);
  
  /**
    \brief       abort sending/receiving data to/from USART transmitter/receiver.
    \param[in]   handle  usart handle to operate.
    \return      error code
  */
  int32_t csi_usart_abort_transfer(usart_handle_t handle);
  
  /**
    \brief       Get USART status.
    \param[in]   handle  usart handle to operate.
    \return      USART status \ref usart_status_t
  */
  usart_status_t csi_usart_get_status(usart_handle_t handle);
  
  /**
    \brief       flush receive/send data.
    \param[in]   handle usart handle to operate.
    \param[in]   type \ref usart_flush_type_e .
    \return      \ref execution_status
  */
  int32_t csi_usart_flush(usart_handle_t handle, usart_flush_type_e type);
  
  /**
    \brief       control interrupt on/off.
    \param[in]   handle usart handle to operate.
    \param[in]   type \ref usart_intr_type_e.
    \param[in]   flag 0-OFF, 1-ON.
    \return      error code
  */
  int32_t csi_usart_interrupt_on_off(usart_handle_t handle, usart_intr_type_e type, int flag);
  
  /**
    \brief       set the baut drate of usart.
    \param[in]   addr  usart base to operate.
    \param[in]   baudrate baud rate
    \param[in]   apbfreq the frequency of the apb.
    \return      error code
  */
  int32_t csi_usart_config_baudrate(usart_handle_t handle, uint32_t baudrate, uint32_t apbfreq);
  
  /**
    \brief       config usart mode.
    \param[in]   handle  usart handle to operate.
    \param[in]   mode    \ref usart_mode_e
    \return      error code
  */
  int32_t csi_usart_config_mode(usart_handle_t handle, usart_mode_e mode);
  
  /**
    \brief       config usart parity.
    \param[in]   handle  usart handle to operate.
    \param[in]   parity    \ref usart_parity_e
    \return      error code
  */
  int32_t csi_usart_config_parity(usart_handle_t handle, usart_parity_e parity);
  
  /**
    \brief       config usart stop bit number.
    \param[in]   handle  usart handle to operate.
    \param[in]   stopbits  \ref usart_stop_bits_e
    \return      error code
  */
  int32_t dw_usart_config_stopbits(usart_handle_t handle, usart_stop_bits_e stopbit);
  
  /**
    \brief       config usart data length.
    \param[in]   handle  usart handle to operate.
    \param[in]   databits      \ref usart_data_bits_e
    \return      error code
  */
  int32_t csi_usart_config_databits(usart_handle_t handle, usart_data_bits_e databits);
  
  /**
    \brief       get character in query mode.
    \param[in]   handle  usart handle to operate.
    \param[in]   the pointer to the received character if return 0.
    \return      error code
  */
  int32_t csi_usart_getchar(usart_handle_t handle, uint8_t *ch);
  
  /**
    \brief       transmit character in query mode.
    \param[in]   handle  usart handle to operate.
    \param[in]   ch  the input character
    \return      error code
  */
  int32_t csi_usart_putchar(usart_handle_t handle, uint8_t ch);
  
  /**
    \brief       Get usart send data count.
    \param[in]   handle  usart handle to operate.
    \return      number of data bytes transferred
  */
  uint32_t csi_usart_get_tx_count(usart_handle_t handle);
  
  /**
    \brief       Get usart receive data count.
    \param[in]   handle  usart handle to operate.
    \return      number of data bytes transferred
  */
  uint32_t csi_usart_get_rx_count(usart_handle_t handle);
  
  /**
    \brief       control usart power.
    \param[in]   handle  usart handle to operate.
    \param[in]   state   power state.\ref csi_power_stat_e.
    \return      error code
  */
  int32_t csi_usart_power_control(usart_handle_t handle, csi_power_stat_e state);
  
  /**
    \brief       config usart flow control type.
    \param[in]   handle  usart handle to operate.
    \param[in]   flowctrl_type   flow control type.\ref usart_flowctrl_type_e.
    \param[in]   tx_flow  The TX flow pin name
    \param[in]   rx_flow  The RX flow pin name
    \return      error code
  */
  int32_t csi_usart_config_flowctrl(usart_handle_t handle,
                                    usart_flowctrl_type_e flowctrl_type,
                                    pin_t tx_flow, pin_t rx_flow);
  /**
    \brief       usart modem control.
    \param[in]   handle  usart handle to operate.
    \param[in]   modem_ctrl   modem control action.\ref usart_modem_ctrl_e.
    \return      error code
  */
  int32_t csi_usart_modem_ctrl(usart_handle_t handle, usart_modem_ctrl_e modem_ctrl);
  
  /**
    \brief       get usart modem status.
    \param[in]   handle  usart handle to operate.
    \param[in]   modem_ctrl   modem control action.\ref usart_modem_ctrl_e.
    \return      modem status.\ref usart_modem_stat_t.
  */
  usart_modem_stat_t csi_usart_get_modem_stat(usart_handle_t handle);
  
  /**
    \brief       config usart clock Polarity and Phase.
    \param[in]   handle  usart handle to operate.
    \param[in]   cpol    Clock Polarity.\ref usart_cpol_e.
    \param[in]   cpha    Clock Phase.\ref usart_cpha_e.
    \return      error code
  */
  int32_t csi_usart_config_clock(usart_handle_t handle, usart_cpol_e cpol, usart_cpha_e cpha);
  
  /**
    \brief       config usart guard time.
    \param[in]   handle  usart handle to operate.
    \param[in]   num_of_bits   guard time in number of bit periods.
    \return      error code
  */
  int32_t csi_usart_config_guard_time(usart_handle_t handle, uint32_t num_of_bits);
  
  /**
    \brief       check if usart is readable(data received).
    \param[in]   handle  usart handle to operate.
    \return      1 - a character can be read, 0 if nothing to read ,negative for error code
  */
  int32_t csi_usart_readable(usart_handle_t handle);
  
  /**
    \brief       check if usart is writable(free for data sending).
    \param[in]   handle  usart handle to operate.
    \return      1 - a character can be written, 0 -  cannot be written ,negative for error code
  */
  int32_t csi_usart_writable(usart_handle_t handle);
  
  /**
    \brief       control the transmit.
    \param[in]   handle  usart handle to operate.
    \param[in]   1 - enable the transmitter. 0 - disable the transmitter
    \return      error code
  */
  int32_t csi_usart_control_tx(usart_handle_t handle, uint32_t enable);
  
  /**
    \brief       control the receive.
    \param[in]   handle  usart handle to operate.
    \param[in]   1 - enable the receiver. 0 - disable the receiver
    \return      error code
  */
  int32_t csi_usart_control_rx(usart_handle_t handle, uint32_t enable);
  
  /**
    \brief       control the break.
    \param[in]   handle  usart handle to operate.
    \param[in]   1- Enable continuous Break transmission,0 - disable continuous Break transmission
    \return      error code
  */
  int32_t csi_usart_control_break(usart_handle_t handle, uint32_t enable);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* _CSI_USART_H_ */
  