rt-thread/bsp/gd32303e-eval/Libraries/GD32F30x_standard_peripheral/Source/gd32f30x_usart.c

/*!
    \file  gd32f30x_usart.c
    \brief USART driver
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-02-10, V1.0.1, firmware for GD32F30x
*/

#include "gd32f30x_usart.h"

/*!
    \brief      reset USART/UART 
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_deinit(uint32_t usart_periph)
{
    switch(usart_periph){
    case USART0:
        rcu_periph_reset_enable(RCU_USART0RST);
        rcu_periph_reset_disable(RCU_USART0RST);
        break;
    case USART1:
        rcu_periph_reset_enable(RCU_USART1RST);
        rcu_periph_reset_disable(RCU_USART1RST);
        break;
    case USART2:
        rcu_periph_reset_enable(RCU_USART2RST);
        rcu_periph_reset_disable(RCU_USART2RST);
        break;
    case UART3:
        rcu_periph_reset_enable(RCU_UART3RST);
        rcu_periph_reset_disable(RCU_UART3RST);
        break;
    case UART4:
        rcu_periph_reset_enable(RCU_UART4RST);
        rcu_periph_reset_disable(RCU_UART4RST);
        break;
    default:
        break;
    }
}

/*!
    \brief      configure USART baud rate value
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  baudval: baud rate value
    \param[out] none
    \retval     none
*/ 
void usart_baudrate_set(uint32_t usart_periph, uint32_t baudval)
{
    uint32_t uclk=0U, intdiv=0U, fradiv=0U, udiv=0U;
    switch(usart_periph){
         /* get clock frequency */
    case USART0:
         uclk=rcu_clock_freq_get(CK_APB2);
         break;
    case USART1:
         uclk=rcu_clock_freq_get(CK_APB1);
         break;
    case USART2:
         uclk=rcu_clock_freq_get(CK_APB1);
         break;
    case UART3:
         uclk=rcu_clock_freq_get(CK_APB1);
         break;
    case UART4:
         uclk=rcu_clock_freq_get(CK_APB1);
         break;  
    default:
         break;
    }
    /* oversampling by 16, configure the value of USART_BAUD */
    udiv = (uclk+baudval/2U)/baudval;
    intdiv = udiv & 0xfff0U;
    fradiv = udiv & 0xfU;
    USART_BAUD(usart_periph) |= ((USART_BAUD_FRADIV | USART_BAUD_INTDIV) & (intdiv | fradiv));
}

/*!
    \brief     configure USART parity
    \param[in] usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in] paritycfg: configure USART parity
      \arg       USART_PM_NONE: no parity
      \arg       USART_PM_ODD:  odd parity
      \arg       USART_PM_EVEN: even parity 
    \param[out] none
    \retval     none
*/
void usart_parity_config(uint32_t usart_periph, uint32_t paritycfg)
{
    /* clear USART_CTL0 PM,PCEN bits */
    USART_CTL0(usart_periph) &= ~(USART_CTL0_PM | USART_CTL0_PCEN);
    /* configure USART parity mode */
    USART_CTL0(usart_periph) |= paritycfg ;
}

/*!
    \brief     configure USART word length
    \param[in] usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in] wlen: USART word length configure
      \arg       USART_WL_8BIT: 8 bits
      \arg       USART_WL_9BIT: 9 bits
    \param[out] none
    \retval     none
*/
void usart_word_length_set(uint32_t usart_periph, uint32_t wlen)
{
    /* clear USART_CTL0 WL bit */
    USART_CTL0(usart_periph) &= ~USART_CTL0_WL;
    /* configure USART word length */
    USART_CTL0(usart_periph) |= wlen;
}

/*!
    \brief     configure USART stop bit length
    \param[in] usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in] stblen: USART stop bit configure
      \arg       USART_STB_1BIT:   1 bit
      \arg       USART_STB_0_5BIT: 0.5 bit, not available for UARTx(x=3,4)
      \arg       USART_STB_2BIT:   2 bits
      \arg       USART_STB_1_5BIT: 1.5 bits, not available for UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_stop_bit_set(uint32_t usart_periph, uint32_t stblen)
{
    /* clear USART_CTL1 STB bits */
    USART_CTL1(usart_periph) &= ~USART_CTL1_STB; 
    /* configure USART stop bits */
    USART_CTL1(usart_periph) |= stblen;
}
/*!
    \brief      enable USART
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_enable(uint32_t usart_periph)
{
    USART_CTL0(usart_periph) |= USART_CTL0_UEN;
}

/*!
    \brief     disable USART
    \param[in] usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_disable(uint32_t usart_periph)
{
    USART_CTL0(usart_periph) &= ~(USART_CTL0_UEN);
}

/*!
    \brief      configure USART transmitter
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  txconfig: enable or disable USART transmitter
      \arg        USART_TRANSMIT_ENABLE: enable USART transmission
      \arg        USART_TRANSMIT_DISABLE: enable USART transmission
    \param[out] none
    \retval     none
*/
void usart_transmit_config(uint32_t usart_periph, uint32_t txconfig)
{
    uint32_t ctl = 0U;
    
    ctl = USART_CTL0(usart_periph);
    ctl &= ~USART_CTL0_TEN;
    ctl |= txconfig;
    /* configure transfer mode */
    USART_CTL0(usart_periph) = ctl;
}

/*!
    \brief      configure USART receiver
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  rxconfig: enable or disable USART receiver
      \arg        USART_RECEIVE_ENABLE: enable USART reception
      \arg        USART_RECEIVE_DISABLE: disable USART reception
    \param[out] none
    \retval     none
*/
void usart_receive_config(uint32_t usart_periph, uint32_t rxconfig)
{
    uint32_t ctl = 0U;
    
    ctl = USART_CTL0(usart_periph);
    ctl &= ~USART_CTL0_REN;
    ctl |= rxconfig;
    /* configure transfer mode */
    USART_CTL0(usart_periph) = ctl;
}

/*!
    \brief      data is transmitted/received with the LSB/MSB first
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  msbf: LSB/MSB
      \arg        USART_MSBF_LSB: LSB first
      \arg        USART_MSBF_MSB: MSB first
    \param[out] none
    \retval     none
*/
void usart_data_first_config(uint32_t usart_periph, uint32_t msbf)
{
    USART_CTL3(usart_periph) &= ~(USART_CTL3_MSBF); 
    USART_CTL3(usart_periph) |= msbf;
}

/*!
    \brief      configure USART inversion
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  invertpara: refer to enum USART_INVERT_CONFIG
      \arg        USART_DINV_ENABLE: data bit level inversion
      \arg        USART_DINV_DISABLE: data bit level not inversion
      \arg        USART_TXPIN_ENABLE: TX pin level inversion
      \arg        USART_TXPIN_DISABLE: TX pin level not inversion
      \arg        USART_RXPIN_ENABLE: RX pin level inversion
      \arg        USART_RXPIN_DISABLE: RX pin level not inversion
    \param[out] none
    \retval     none
*/
void usart_invert_config(uint32_t usart_periph, usart_invert_enum invertpara)
{
    /* inverted or not the specified siginal */ 
    switch(invertpara){
    case USART_DINV_ENABLE:
        USART_CTL3(usart_periph) |= USART_CTL3_DINV;
        break;
    case USART_TXPIN_ENABLE:
        USART_CTL3(usart_periph) |= USART_CTL3_TINV;
        break;
    case USART_RXPIN_ENABLE:
        USART_CTL3(usart_periph) |= USART_CTL3_RINV;
        break;
    case USART_DINV_DISABLE:
        USART_CTL3(usart_periph) &= ~(USART_CTL3_DINV);
        break;
    case USART_TXPIN_DISABLE:
        USART_CTL3(usart_periph) &= ~(USART_CTL3_TINV);
        break;
    case USART_RXPIN_DISABLE:
        USART_CTL3(usart_periph) &= ~(USART_CTL3_RINV);
        break;
    default:
        break;
    }
}

/*!
    \brief      enable receiver timeout of USART
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_receiver_timeout_enable(uint32_t usart_periph)
{
    USART_CTL3(usart_periph) |= USART_CTL3_RTEN;
}

/*!
    \brief      disable receiver timeout of USART
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_receiver_timeout_disable(uint32_t usart_periph)
{
    USART_CTL3(usart_periph) &= ~(USART_CTL3_RTEN);
}

/*!
    \brief      set the receiver timeout threshold of USART
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  rtimeout: 0-0xFFFFFF
    \param[out] none
    \retval     none
*/
void usart_receiver_timeout_threshold_config(uint32_t usart_periph, uint32_t rtimeout)
{
    USART_RT(usart_periph) &= ~(USART_RT_RT);
    USART_RT(usart_periph) |= rtimeout;
}

/*!
    \brief      USART transmit data function
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  data: data of transmission 
    \param[out] none
    \retval     none
*/
void usart_data_transmit(uint32_t usart_periph, uint32_t data)
{
    USART_DATA(usart_periph) = ((uint16_t)USART_DATA_DATA & data);
}

/*!
    \brief      USART receive data function
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     data of received
*/
uint16_t usart_data_receive(uint32_t usart_periph)
{
    return (uint16_t)(GET_BITS(USART_DATA(usart_periph), 0U, 8U));
}

/*!
    \brief      configure the address of the USART in wake up by address match mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  addr: address of USART/UART
    \param[out] none
    \retval     none
*/
void usart_address_config(uint32_t usart_periph, uint8_t addr)
{
    USART_CTL1(usart_periph) &= ~(USART_CTL1_ADDR);
    USART_CTL1(usart_periph) |= (USART_CTL1_ADDR & addr);
}

/*!
    \brief      receiver in mute mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_mute_mode_enable(uint32_t usart_periph)
{
    USART_CTL0(usart_periph) |= USART_CTL0_RWU;
}

/*!
    \brief      receiver in active mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_mute_mode_disable(uint32_t usart_periph)
{
    USART_CTL0(usart_periph) &= ~(USART_CTL0_RWU);
}

/*!
    \brief      configure wakeup method in mute mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  wmethod: two methods be used to enter or exit the mute mode
      \arg        USART_WM_IDLE: idle line
      \arg        USART_WM_ADDR: address mask
    \param[out] none
    \retval     none
*/
void usart_mute_mode_wakeup_config(uint32_t usart_periph, uint32_t wmethod)
{
    USART_CTL0(usart_periph) &= ~(USART_CTL0_WM);
    USART_CTL0(usart_periph) |= wmethod;
}

/*!
    \brief      enable LIN mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_lin_mode_enable(uint32_t usart_periph)
{   
    USART_CTL1(usart_periph) |= USART_CTL1_LMEN;
}

/*!
    \brief      disable LIN mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_lin_mode_disable(uint32_t usart_periph)
{   
    USART_CTL1(usart_periph) &= ~(USART_CTL1_LMEN);
}

/*!
    \brief      configure lin break frame length
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  lblen: lin break frame length
      \arg        USART_LBLEN_10B: 10 bits
      \arg        USART_LBLEN_11B: 11 bits
    \param[out] none
    \retval     none
*/
void usart_lin_break_dection_length_config(uint32_t usart_periph, uint32_t lblen)
{
    USART_CTL1(usart_periph) &= ~(USART_CTL1_LBLEN);
    USART_CTL1(usart_periph) |= (USART_CTL1_LBLEN & lblen);
}

/*!
    \brief      send break frame
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_send_break(uint32_t usart_periph)
{
    USART_CTL0(usart_periph) |= USART_CTL0_SBKCMD;
}

/*!
    \brief      enable half duplex mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_halfduplex_enable(uint32_t usart_periph)
{   
    USART_CTL2(usart_periph) |= USART_CTL2_HDEN;
}

/*!
    \brief      disable half duplex mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_halfduplex_disable(uint32_t usart_periph)
{  
    USART_CTL2(usart_periph) &= ~(USART_CTL2_HDEN);
}

/*!
    \brief      enable CK pin in synchronous mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_synchronous_clock_enable(uint32_t usart_periph)
{
    USART_CTL1(usart_periph) |= USART_CTL1_CKEN;
}

/*!
    \brief      disable CK pin in synchronous mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_synchronous_clock_disable(uint32_t usart_periph)
{
    USART_CTL1(usart_periph) &= ~(USART_CTL1_CKEN);
}

/*!
    \brief      configure USART synchronous mode parameters
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  clen: CK length
      \arg        USART_CLEN_NONE: there are 7 CK pulses for an 8 bit frame and 8 CK pulses for a 9 bit frame 
      \arg        USART_CLEN_EN:   there are 8 CK pulses for an 8 bit frame and 9 CK pulses for a 9 bit frame
    \param[in]  cph: clock phase
      \arg        USART_CPH_1CK: first clock transition is the first data capture edge 
      \arg        USART_CPH_2CK: second clock transition is the first data capture edge
    \param[in]  cpl: clock polarity 
      \arg        USART_CPL_LOW:  steady low value on CK pin 
      \arg        USART_CPL_HIGH: steady high value on CK pin
    \param[out] none
    \retval     none
*/
void usart_synchronous_clock_config(uint32_t usart_periph, uint32_t clen, uint32_t cph, uint32_t cpl)
{
    uint32_t ctl = 0U;
    
    /* read USART_CTL1 register */
    ctl = USART_CTL1(usart_periph);
    /* set CK length, CK phase, CK polarity */
    ctl |= (USART_CTL1_CLEN & clen) | (USART_CTL1_CPH & cph) | (USART_CTL1_CPL & cpl);

    USART_CTL1(usart_periph) |= ctl;
}

/*!
    \brief      configure guard time value in smartcard mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  guat: guard time value
    \param[out] none
    \retval     none
*/
void usart_guard_time_config(uint32_t usart_periph,uint32_t guat)
{
    USART_GP(usart_periph) &= ~(USART_GP_GUAT);
    USART_GP(usart_periph) |= (USART_GP_GUAT & ((guat)<<8));
}

/*!
    \brief      enable smartcard mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_smartcard_mode_enable(uint32_t usart_periph)
{
    USART_CTL2(usart_periph) |= USART_CTL2_SCEN;
}

/*!
    \brief      disable smartcard mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_smartcard_mode_disable(uint32_t usart_periph)
{
    USART_CTL2(usart_periph) &= ~(USART_CTL2_SCEN);
}

/*!
    \brief      enable NACK in smartcard mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_smartcard_mode_nack_enable(uint32_t usart_periph)
{
    USART_CTL2(usart_periph) |= USART_CTL2_NKEN;
}

/*!
    \brief      disable NACK in smartcard mode
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[out] none
    \retval     none
*/
void usart_smartcard_mode_nack_disable(uint32_t usart_periph)
{
    USART_CTL2(usart_periph) &= ~(USART_CTL2_NKEN);
}

/*!
    \brief      configure smartcard auto-retry number
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  scrtnum: smartcard auto-retry number
    \param[out] none
    \retval     none
*/
void usart_smartcard_autoretry_config(uint32_t usart_periph, uint32_t scrtnum)
{
    USART_CTL3(usart_periph) &= ~(USART_CTL3_SCRTNUM);
    USART_CTL3(usart_periph) |= (USART_CTL3_SCRTNUM & ((scrtnum)<<1));
}

/*!
    \brief      configure block length in Smartcard T=1 reception
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  bl: block length
    \param[out] none
    \retval     none
*/
void usart_block_length_config(uint32_t usart_periph, uint32_t bl)
{
    USART_RT(usart_periph) &= ~(USART_RT_BL);
    USART_RT(usart_periph) |= (USART_RT_BL & ((bl)<<24));
}

/*!
    \brief      enable IrDA mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_irda_mode_enable(uint32_t usart_periph)
{
    USART_CTL2(usart_periph) |= USART_CTL2_IREN;
}

/*!
    \brief      disable IrDA mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[out] none
    \retval     none
*/
void usart_irda_mode_disable(uint32_t usart_periph)
{
    USART_CTL2(usart_periph) &= ~(USART_CTL2_IREN);
}

/*!
    \brief      configure the peripheral clock prescaler in USART IrDA low-power mode
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  psc: 0x00-0xFF
    \param[out] none
    \retval     none
*/
void usart_prescaler_config(uint32_t usart_periph, uint8_t psc)
{
    USART_GP(usart_periph) &= ~(USART_GP_PSC);
    USART_GP(usart_periph) |= psc;
}

/*!
    \brief      configure IrDA low-power
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  irlp: IrDA low-power or normal
      \arg        USART_IRLP_LOW: low-power
      \arg        USART_IRLP_NORMAL: normal
    \param[out] none
    \retval     none
*/
void usart_irda_lowpower_config(uint32_t usart_periph, uint32_t irlp)
{
    USART_CTL2(usart_periph) &= ~(USART_CTL2_IRLP);
    USART_CTL2(usart_periph) |= (USART_CTL2_IRLP & irlp);
}

/*!
    \brief      configure hardware flow control RTS
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  hardwareflow: enable or disable RTS
      \arg        USART_RTS_ENABLE:  enable RTS
      \arg        USART_RTS_DISABLE: disable RTS
    \param[out] none
    \retval     none
*/
void usart_hardware_flow_rts_config(uint32_t usart_periph, uint32_t rtsconfig)
{
    uint32_t ctl = 0U;
    
    ctl = USART_CTL2(usart_periph);
    ctl &= ~USART_CTL2_RTSEN;
    ctl |= rtsconfig;
    /* configure RTS */
    USART_CTL2(usart_periph) = ctl;
}

/*!
    \brief      configure hardware flow control CTS
    \param[in]  usart_periph: USARTx(x=0,1,2)
    \param[in]  hardwareflow: enable or disable CTS
      \arg        USART_CTS_ENABLE:  enable CTS
      \arg        USART_CTS_DISABLE: disable CTS
    \param[out] none
    \retval     none
*/
void usart_hardware_flow_cts_config(uint32_t usart_periph, uint32_t ctsconfig)
{
    uint32_t ctl = 0U;
    
    ctl = USART_CTL2(usart_periph);
    ctl &= ~USART_CTL2_CTSEN;
    ctl |= ctsconfig;
    /* configure CTS */
    USART_CTL2(usart_periph) = ctl;
}

/*!
    \brief      configure USART DMA reception
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3)
    \param[in]  dmacmd: enable or disable DMA for reception
      \arg        USART_DENR_ENABLE:  DMA enable for reception
      \arg        USART_DENR_DISABLE: DMA disable for reception
    \param[out] none
    \retval     none
*/
void usart_dma_receive_config(uint32_t usart_periph, uint32_t dmacmd)
{
    uint32_t ctl = 0U;
    
    ctl = USART_CTL2(usart_periph);
    ctl &= ~USART_CTL2_DENR;
    ctl |= dmacmd;
    /* configure DMA reception */
    USART_CTL2(usart_periph) = ctl;
}

/*!
    \brief      configure USART DMA transmission
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3)
    \param[in]  dmacmd: enable or disable DMA for transmission
      \arg        USART_DENT_ENABLE:  DMA enable for transmission
      \arg        USART_DENT_DISABLE: DMA disable for transmission
    \param[out] none
    \retval     none
*/
void usart_dma_transmit_config(uint32_t usart_periph, uint32_t dmacmd)
{
    uint32_t ctl = 0U;
    
    ctl = USART_CTL2(usart_periph);
    ctl &= ~USART_CTL2_DENT;
    ctl |= dmacmd;
    /* configure DMA transmission */
    USART_CTL2(usart_periph) = ctl;
}

/*!
    \brief      get flag in STAT0/STAT1 register
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  flag: USART flags, refer to usart_flag_enum
                only one among these parameters can be selected
      \arg        USART_FLAG_CTS: CTS change flag
      \arg        USART_FLAG_LBD: LIN break detected flag 
      \arg        USART_FLAG_TBE: transmit data buffer empty 
      \arg        USART_FLAG_TC: transmission complete 
      \arg        USART_FLAG_RBNE: read data buffer not empty 
      \arg        USART_FLAG_IDLE: IDLE frame detected flag 
      \arg        USART_FLAG_ORERR: overrun error 
      \arg        USART_FLAG_NERR: noise error flag 
      \arg        USART_FLAG_FERR: frame error flag 
      \arg        USART_FLAG_PERR: parity error flag 
      \arg        USART_FLAG_BSY: busy flag 
      \arg        USART_FLAG_EB: end of block flag 
      \arg        USART_FLAG_RT: receiver timeout flag 
    \param[out] none
    \retval     FlagStatus: SET or RESET
*/
FlagStatus usart_flag_get(uint32_t usart_periph, usart_flag_enum flag)
{
    if(RESET != (USART_REG_VAL(usart_periph, flag) & BIT(USART_BIT_POS(flag)))){
        return SET;
    }else{
        return RESET;
    }
}

/*!
    \brief      clear flag in STAT0/STAT1 register
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  flag: USART flags, refer to usart_flag_enum
                only one among these parameters can be selected
      \arg        USART_FLAG_CTS: CTS change flag
      \arg        USART_FLAG_LBD: LIN break detected flag
      \arg        USART_FLAG_TC: transmission complete
      \arg        USART_FLAG_RBNE: read data buffer not empty
      \arg        USART_FLAG_EB: end of block flag
      \arg        USART_FLAG_RT: receiver timeout flag
    \param[out] none
    \retval     none
*/
void usart_flag_clear(uint32_t usart_periph, usart_flag_enum flag)
{
    USART_REG_VAL(usart_periph, flag) &= ~BIT(USART_BIT_POS(flag));
}

/*!
    \brief      enable USART interrupt
     \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  int_flag
                only one among these parameters can be selected
      \arg        USART_INT_PERR: parity error interrupt
      \arg        USART_INT_TBE: transmitter buffer empty interrupt
      \arg        USART_INT_TC: transmission complete interrupt
      \arg        USART_INT_RBNE: read data buffer not empty interrupt and overrun error interrupt
      \arg        USART_INT_IDLE: IDLE line detected interrupt
      \arg        USART_INT_LBD: LIN break detected interrupt
      \arg        USART_INT_ERR: error interrupt
      \arg        USART_INT_CTS: CTS interrupt
      \arg        USART_INT_RT: interrupt enable bit of receive timeout event
      \arg        USART_INT_EB: interrupt enable bit of end of block event
    \param[out] none
    \retval     none
*/
void usart_interrupt_enable(uint32_t usart_periph, uint32_t int_flag)
{
    USART_REG_VAL(usart_periph, int_flag) |= BIT(USART_BIT_POS(int_flag));
}

/*!
    \brief      disable USART interrupt
     \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  int_flag
                only one among these parameters can be selected
      \arg        USART_INT_PERR: parity error interrupt
      \arg        USART_INT_TBE: transmitter buffer empty interrupt
      \arg        USART_INT_TC: transmission complete interrupt
      \arg        USART_INT_RBNE: read data buffer not empty interrupt and overrun error interrupt
      \arg        USART_INT_IDLE: IDLE line detected interrupt
      \arg        USART_INT_LBD: LIN break detected interrupt
      \arg        USART_INT_ERR: error interrupt
      \arg        USART_INT_CTS: CTS interrupt
      \arg        USART_INT_RT: interrupt enable bit of receive timeout event
      \arg        USART_INT_EB: interrupt enable bit of end of block event
    \param[out] none
    \retval     none
*/
void usart_interrupt_disable(uint32_t usart_periph, uint32_t int_flag)
{
    USART_REG_VAL(usart_periph, int_flag) &= ~BIT(USART_BIT_POS(int_flag));
}

/*!
    \brief      get USART interrupt and flag status
     \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  int_flag
      \arg        USART_INT_FLAG_PERR: parity error interrupt and flag
      \arg        USART_INT_FLAG_TBE: transmitter buffer empty interrupt and flag
      \arg        USART_INT_FLAG_TC: transmission complete interrupt and flag
      \arg        USART_INT_FLAG_RBNE: read data buffer not empty interrupt and flag
      \arg        USART_INT_FLAG_RBNE_ORERR: read data buffer not empty interrupt and overrun error flag
      \arg        USART_INT_FLAG_IDLE: IDLE line detected interrupt and flag
      \arg        USART_INT_FLAG_LBD: LIN break detected interrupt and flag
      \arg        USART_INT_FLAG_CTS: CTS interrupt and flag
      \arg        USART_INT_FLAG_ERR_ORERR: error interrupt and overrun error
      \arg        USART_INT_FLAG_ERR_NERR: error interrupt and noise error flag
      \arg        USART_INT_FLAG_ERR_FERR: error interrupt and frame error flag
      \arg        USART_INT_FLAG_EB: interrupt enable bit of end of block event and flag
      \arg        USART_INT_FLAG_RT: interrupt enable bit of receive timeout event and flag
    \param[out] none
    \retval     FlagStatus
*/
FlagStatus usart_interrupt_flag_get(uint32_t usart_periph, uint32_t int_flag)
{
    uint32_t intenable = 0U, flagstatus = 0U;
    /* get the interrupt enable bit status */
    intenable = (USART_REG_VAL(usart_periph, int_flag) & BIT(USART_BIT_POS(int_flag)));
    /* get the corresponding flag bit status */
    flagstatus = (USART_REG_VAL2(usart_periph, int_flag) & BIT(USART_BIT_POS2(int_flag)));

    if(flagstatus && intenable){
        return SET;
    }else{
        return RESET; 
    }
}

/*!
    \brief      clear USART interrupt flag in STAT0/STAT1 register
    \param[in]  usart_periph: USARTx(x=0,1,2)/UARTx(x=3,4)
    \param[in]  flag: USART interrupt flag
      \arg        USART_INT_FLAG_CTS: CTS change flag
      \arg        USART_INT_FLAG_LBD: LIN break detected flag
      \arg        USART_INT_FLAG_TC: transmission complete
      \arg        USART_INT_FLAG_RBNE: read data buffer not empty
      \arg        USART_INT_FLAG_EB: end of block flag
      \arg        USART_INT_FLAG_RT: receiver timeout flag
    \param[out] none
    \retval     none
*/
void usart_interrupt_flag_clear(uint32_t usart_periph, uint32_t flag)
{
    USART_REG_VAL2(usart_periph, flag) &= ~BIT(USART_BIT_POS2(flag));
}