/*
 * Author: Jake G
 * Date: 2026
 * filename: wwdg.c
 * description: Source for window watchdog implimentation.
 */

#include "wwdg.h"
#include "RegEdit.h"
#include "ch32fun.h"

#define WWDG_MIN_WINDOW_VAL 0x40 // 64
#define WWDG_MAX_WINDOW_VAL 0x7F // 127

static inline void wwdg_rcc_enable(void)
{
    // RegEdit_u32_AND_Num((void *)&RCC->APB1PCENR, RCC_WWDGEN);
    RegEdit_u32_SetBit((void *)&RCC->APB1PCENR, RCC_WWDGEN_BIT);
}

void wwdg_enable(void)
{
    wwdg_rcc_enable();
    RegEdit_u32_SetBit((void *)&WWDG->CTLR, WWDG_CTLR_WDGA_BIT);
    return;
}

// maybe this should actually set the reset bit in the APB1 reg?
void wwdg_disable(void)
{
    RegEdit_u32_ClearBit((void *)&RCC->APB1PCENR, RCC_WWDGEN_BIT);
    return;
}

bool wwdg_set_clock_div(uint8_t div)
{
    if (div > 3)
    {
        return false;
    }

    RegEdit_u16_ClearBit((void *)&WWDG->CFGR, 7);
    RegEdit_u16_ClearBit((void *)&WWDG->CFGR, 8);
    RegEdit_u16_OR_Num((void *)&WWDG->CFGR, div);

    return true;
}

bool wwdg_set_window(uint8_t value)
{
    // Check if either the input is bigger than 7-Bits or less than the min.
    if (value < WWDG_MIN_WINDOW_VAL || value > WWDG_MAX_WINDOW_VAL)
    {
        return false;
    }

    // First we clear the value in the first 7-Bits.
    //  UINT16_MAX & ~127 = 0xFF80, aka bits [0:6]
    RegEdit_u16_AND_Num((void *)&WWDG->CFGR, 0xFF80);

    // Now we set the value.
    RegEdit_u16_OR_Num((void *)&WWDG->CFGR, value);

    return true;
}

bool wwdg_reset_timer(uint8_t reset_value)
{
    if (reset_value > WWDG_MAX_WINDOW_VAL || reset_value < WWDG_MIN_WINDOW_VAL)
    {
        return false;
    }

    // Clear the last six bits
    RegEdit_u16_AND_Num((void *)&WWDG->CTLR, 0xFF80);

    // Set the last six bits.
    RegEdit_u16_OR_Num((void *)&WWDG->CTLR, reset_value);

    return true;
}

void wwdg_enable_interrupt(void)
{
    RegEdit_u16_SetBit((void *)&WWDG->CFGR, WWDG_EWI_BIT);
}

void wwdg_disable_interrupt(void)
{
    RegEdit_u16_ClearBit((void *)&WWDG->CFGR, WWDG_EWI_BIT);
}