/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-05-24                  the first version
 */

#include <rthw.h>
#include <rtthread.h>
#include "at32f403a_407.h"
#include "includes.h"
#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
/*
 * Please modify RT_HEAP_SIZE if you enable RT_USING_HEAP
 * the RT_HEAP_SIZE max value = (sram size - ZI size), 1024 means 1024 bytes
 */  
#define RT_HEAP_SIZE (19*1024)  /* 20KB-1KB to fit 41KB preset buffer in 96KB RAM */
static rt_uint8_t rt_heap[RT_HEAP_SIZE];

RT_WEAK void *rt_heap_begin_get(void)
{
    return rt_heap;
}

RT_WEAK void *rt_heap_end_get(void)
{
    return rt_heap + RT_HEAP_SIZE;
}
#endif

void rt_os_tick_callback(void)
{
    rt_interrupt_enter();
    
    rt_tick_increase();

    rt_interrupt_leave();
}



/**
 * This function will initial your board.
 */
void rt_hw_board_init(void)
{
//#error "TODO 1: OS Tick Configuration."
    /* 
     * TODO 1: OS Tick Configuration
     * Enable the hardware timer and call the rt_os_tick_callback function
     * periodically with the frequency RT_TICK_PER_SECOND. 
     */
      wk_system_clock_config();
      system_core_clock_update();

      /* 使能 FPU（CP10/CP11 全访问）。
         RT-Thread 经 __low_level_init() 接管启动后，IAR cstartup 的 __iar_init_vfp 不会执行；
         若不手动使能，任何 VFP 指令（含 IAR 用 VFP 寄存器优化的 memcpy）
         都会触发 NOCP UsageFault，升级为 HardFault。 */
      SCB->CPACR |= ((3UL << (10 * 2)) | (3UL << (11 * 2)));
      __DSB();
      __ISB();

      //_SysTick_Config(system_core_clock / RT_TICK_PER_SECOND);
      SysTick_Config(system_core_clock/RT_TICK_PER_SECOND);
      
    /* Call components board initial (use INIT_BOARD_EXPORT()) */
#ifdef RT_USING_COMPONENTS_INIT
    rt_components_board_init();
#endif

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
    rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());
#endif
}

#ifdef RT_USING_CONSOLE

//#include <LowLevelIOInterface.h>

/* --------------------------------------------------------------------------
 * 控制台输出：USART2（PA2=TX, PA3=RX）@115200
 * 惰性初始化：首次调用时自行使能时钟并配置 UART，任意时机都可用
 * （rt_show_version、rt_kprintf、HardFault dump、printf 都走这里）
 * ------------------------------------------------------------------------ */
static uint8_t console_uart_inited = 0;

static void console_uart_init(void)
{
    gpio_init_type gpio_init_struct;

    if (console_uart_inited)
        return;
    console_uart_inited = 1;

    gpio_default_para_init(&gpio_init_struct);

    /* 使能时钟 */
    crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
    crm_periph_clock_enable(CRM_USART2_PERIPH_CLOCK, TRUE);

    /* PA2 = USART2_TX（复用推挽输出） */
    gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
    gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
    gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
    gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_MODERATE;
    gpio_init_struct.gpio_pins = GPIO_PINS_2;
    gpio_init(GPIOA, &gpio_init_struct);

    /* PA3 = USART2_RX（输入） */
    gpio_init_struct.gpio_mode = GPIO_MODE_INPUT;
    gpio_init_struct.gpio_pins = GPIO_PINS_3;
    gpio_init(GPIOA, &gpio_init_struct);

    usart_init(USART2, 115200, USART_DATA_8BITS, USART_STOP_1_BIT);
    usart_transmitter_enable(USART2, TRUE);
    usart_receiver_enable(USART2, TRUE);
    usart_parity_selection_config(USART2, USART_PARITY_NONE);
    usart_hardware_flow_control_set(USART2, USART_HARDWARE_FLOW_NONE);
    usart_enable(USART2, TRUE);
}

static void console_uart_putchar(char c)
{
    while ((USART2->sts & USART_TDBE_FLAG) == RESET)
    {
    }
    USART2->dt = (uint16_t)c;
}

void rt_hw_console_output(const char *str)
{
    console_uart_init();
    while (*str)
    {
        if (*str == '\n')
            console_uart_putchar('\r');
        console_uart_putchar(*str++);
    }
}

///* printf() 重定向到 USART2（IAR DLib low-level interface） */
//size_t __write(int handle, const unsigned char *buffer, size_t size)
//{
//    size_t n;
//
//    if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR)
//        return 0;
//
//    console_uart_init();
//    for (n = 0; n < size; n++)
//    {
//        if (buffer[n] == '\n')
//            console_uart_putchar('\r');
//        console_uart_putchar((char)buffer[n]);
//    }
//    return size;
//}

static int uart_init(void)
{
    /* console 采用惰性初始化，见 rt_hw_console_output / __write */
    return 0;
}
INIT_BOARD_EXPORT(uart_init);

#endif