/*!
    \file  gd32f4xx_syscfg.c
    \brief SYSCFG driver
*/

/*
    Copyright (C) 2016 GigaDevice

    2016-08-15, V1.0.0, firmware for GD32F4xx
*/

#include "gd32f4xx_syscfg.h"

/*!
    \brief      reset the SYSCFG registers
    \param[in]  none
    \param[out] none
    \retval     none
*/
void syscfg_deinit(void)
{
    rcu_periph_reset_enable(RCU_SYSCFGRST);
    rcu_periph_reset_disable(RCU_SYSCFGRST);
}

/*!
    \brief      configure the boot mode 
    \param[in]  syscfg_bootmode: selects the memory remapping
      \arg        SYSCFG_BOOTMODE_FLASH: main flash memory (0x08000000~0x083BFFFF) is mapped at address 0x00000000
      \arg        SYSCFG_BOOTMODE_BOOTLOADER: boot loader (0x1FFF0000 - 0x1FFF77FF) is mapped at address 0x00000000
      \arg        SYSCFG_BOOTMODE_EXMC_SRAM: SRAM/NOR 0 and 1 of EXMC (0x60000000~0x67FFFFFF) is mapped at address 0x00000000
      \arg        SYSCFG_BOOTMODE_SRAM: SRAM0 of on-chip SRAM (0x20000000~0x2001BFFF) is mapped at address 0x00000000
      \arg        SYSCFG_BOOTMODE_EXMC_SDRAM: SDRAM bank0 of EXMC (0xC0000000~0xC7FFFFFF) is mapped at address 0x00000000
    \param[out] none
    \retval     none
*/
void syscfg_bootmode_config(uint8_t syscfg_bootmode)
{
    /* reset the SYSCFG_CFG0_BOOT_MODE bit and set according to syscfg_bootmode */
    SYSCFG_CFG0 &= ~SYSCFG_CFG0_BOOT_MODE;
    SYSCFG_CFG0 |= (uint32_t)syscfg_bootmode;
}

/*!
    \brief      FMC memory mapping swap
    \param[in]  syscfg_fmc_swap: selects the interal flash bank swapping
      \arg        SYSCFG_FMC_SWP_BANK0: bank 0 is mapped at address 0x08000000 and bank 1 is mapped at address 0x08100000
      \arg        SYSCFG_FMC_SWP_BANK1: bank 1 is mapped at address 0x08000000 and bank 0 is mapped at address 0x08100000
    \param[out] none
    \retval     none
*/
void syscfg_fmc_swap_config(uint32_t syscfg_fmc_swap)
{
    uint32_t reg;
    reg = SYSCFG_CFG0;
    /* reset the FMC_SWP bit and set according to syscfg_fmc_swap */
    reg &= ~SYSCFG_CFG0_FMC_SWP;
    SYSCFG_CFG0 = (reg | syscfg_fmc_swap);
}

/*!
    \brief      EXMC memory mapping swap
    \param[in]  syscfg_exmc_swap: selects the memories in EXMC swapping
      \arg        SYSCFG_EXMC_SWP_ENABLE: SDRAM bank 0 and bank 1 are swapped with NAND bank 1 and PC card
      \arg        SYSCFG_EXMC_SWP_DISABLE: no memory mapping swap
    \param[out] none
    \retval     none
*/
void syscfg_exmc_swap_config(uint32_t syscfg_exmc_swap)
{
    uint32_t reg;

    reg = SYSCFG_CFG0;
    /* reset the SYSCFG_CFG0_EXMC_SWP bits and set according to syscfg_exmc_swap */
    reg &= ~SYSCFG_CFG0_EXMC_SWP;
    SYSCFG_CFG0 = (reg | syscfg_exmc_swap);
}

/*!
    \brief      configure the GPIO pin as EXTI Line
    \param[in]  exti_port: specify the GPIO port used in EXTI
      \arg        EXTI_SOURCE_GPIOx(x = A,B,C,D,E,F,G,H,I): EXTI GPIO port
    \param[in]  exti_pin: specify the EXTI line
      \arg        EXTI_SOURCE_PINx(x = 0..15): EXTI GPIO pin
    \param[out] none
    \retval     none
*/
void syscfg_exti_line_config(uint8_t exti_port, uint8_t exti_pin)
{
    uint32_t clear_exti_mask = ~((uint32_t)EXTI_SS_MASK << (EXTI_SS_MSTEP(exti_pin)));
    uint32_t config_exti_mask = ((uint32_t)exti_port) << (EXTI_SS_MSTEP(exti_pin));

    switch(exti_pin/EXTI_SS_JSTEP){
    case EXTISS0:
        /* clear EXTI source line(0..3) */
        SYSCFG_EXTISS0 &= clear_exti_mask;
        /* configure EXTI soure line(0..3) */
        SYSCFG_EXTISS0 |= config_exti_mask;
        break;
    case EXTISS1:
        /* clear EXTI soure line(4..7) */
        SYSCFG_EXTISS1 &= clear_exti_mask;
        /* configure EXTI soure line(4..7) */
        SYSCFG_EXTISS1 |= config_exti_mask;
        break;
    case EXTISS2:
        /* clear EXTI soure line(8..11) */
        SYSCFG_EXTISS2 &= clear_exti_mask;
        /* configure EXTI soure line(8..11) */
        SYSCFG_EXTISS2 |= config_exti_mask;
        break;
    case EXTISS3:
        /* clear EXTI soure line(12..15) */
        SYSCFG_EXTISS3 &= clear_exti_mask;
        /* configure EXTI soure line(12..15) */
        SYSCFG_EXTISS3 |= config_exti_mask;
        break;
    default:
        break;
    }
}

/*!
    \brief      configure the PHY interface for the ethernet MAC
    \param[in]  syscfg_enet_phy_interface: specifies the media interface mode.
      \arg        SYSCFG_ENET_PHY_MII: MII mode is selected
      \arg        SYSCFG_ENET_PHY_RMII: RMII mode is selected 
    \param[out] none
    \retval     none
*/
void syscfg_enet_phy_interface_config(uint32_t syscfg_enet_phy_interface)
{ 
    uint32_t reg;
    
    reg = SYSCFG_CFG1;
    /* reset the ENET_PHY_SEL bit and set according to syscfg_enet_phy_interface */
    reg &= ~SYSCFG_CFG1_ENET_PHY_SEL;
    SYSCFG_CFG1 = (reg | syscfg_enet_phy_interface);
}

/*!
    \brief      configure the I/O compensation cell
    \param[in]  syscfg_compensation: specifies the I/O compensation cell mode
      \arg        SYSCFG_COMPENSATION_ENABLE: I/O compensation cell is enabled
      \arg        SYSCFG_COMPENSATION_DISABLE: I/O compensation cell is disabled
    \param[out] none
    \retval     none
*/
void syscfg_compensation_config(uint32_t syscfg_compensation) 
{
    uint32_t reg;

    reg = SYSCFG_CPSCTL;
    /* reset the SYSCFG_CPSCTL_CPS_EN bit and set according to syscfg_compensation */
    reg &= ~SYSCFG_CPSCTL_CPS_EN;
    SYSCFG_CPSCTL = (reg | syscfg_compensation);
}

/*!
    \brief      checks whether the I/O compensation cell ready flag is set or not
    \param[in]  none
    \param[out] none
    \retval     FlagStatus: SET or RESET
  */
FlagStatus syscfg_flag_get(void)
{
    if(((uint32_t)RESET) != (SYSCFG_CPSCTL & SYSCFG_CPSCTL_CPS_RDY)){
        return SET;
    }else{
        return RESET;
    }
}