/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 * Copyright (c) 2023 HiFiPhile
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

/* metadata:
   manufacturer: STMicroelectronics
*/

// Suppress warning caused by mcu driver
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wundef"
#endif

#include "stm32h5xx_hal.h"

#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif

#include "bsp/board_api.h"

TU_ATTR_UNUSED static void Error_Handler(void) {
}

// STM32H5 errata: reading UID_BASE with ICACHE enabled causes hard fault.
// Cache the unique ID early in board_init() before ICACHE may be enabled.
static uint32_t cached_uid[3];

typedef struct {
  GPIO_TypeDef* port;
  GPIO_InitTypeDef pin_init;
  uint8_t active_state;
} board_pindef_t;

#include "board.h"

#ifdef UART_ID
  #if UART_ID == 1
    #define USARTn            USART1
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART1_CLK_ENABLE
  #elif UART_ID == 2
    #define USARTn            USART2
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART2_CLK_ENABLE
  #elif UART_ID == 3
    #define USARTn            USART3
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART3_CLK_ENABLE
  #endif
#endif

//--------------------------------------------------------------------+
// Forward USB interrupt events to TinyUSB IRQ Handler
//--------------------------------------------------------------------+
void USB_DRD_FS_IRQHandler(void) {
  tusb_int_handler(0, true);
}

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM
//--------------------------------------------------------------------+
#ifdef UART_ID
static UART_HandleTypeDef UartHandle = {
  .Instance = USARTn,
  .Init = {
    .BaudRate = CFG_BOARD_UART_BAUDRATE,
    .WordLength = UART_WORDLENGTH_8B,
    .StopBits = UART_STOPBITS_1,
    .Parity = UART_PARITY_NONE,
    .HwFlowCtl = UART_HWCONTROL_NONE,
    .Mode = UART_MODE_TX_RX,
    .OverSampling = UART_OVERSAMPLING_16
  },
  .AdvancedInit = {
    .AdvFeatureInit = UART_ADVFEATURE_NO_INIT
  }
};
#endif

#ifdef TRACE_ETM
static void trace_etm_init(void) {
  // H5 trace pins are PE2 to PE6 (Nucleo-144: requires trace solder-bridge config, see board docs)
  GPIO_InitTypeDef gpio_init;
  gpio_init.Pin       = GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6;
  gpio_init.Mode      = GPIO_MODE_AF_PP;
  gpio_init.Pull      = GPIO_PULLUP;
  gpio_init.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init.Alternate = GPIO_AF0_TRACE;
  HAL_GPIO_Init(GPIOE, &gpio_init);

  // Enable trace port + clock, synchronous 4-bit mode
  DBGMCU->CR |= DBGMCU_CR_TRACE_IOEN | DBGMCU_CR_TRACE_CLKEN | DBGMCU_CR_TRACE_MODE;
}
#else
#define trace_etm_init()
#endif

void board_init(void) {
  // Cache UID before ICACHE is enabled (STM32H5 errata: reading UID_BASE with ICACHE causes hard fault)
  volatile uint32_t* stm32_uuid = (volatile uint32_t*) UID_BASE;
  cached_uid[0] = stm32_uuid[0];
  cached_uid[1] = stm32_uuid[1];
  cached_uid[2] = stm32_uuid[2];

  HAL_Init(); // required for HAL_RCC_Osc TODO check with freeRTOS
  SystemClock_Config(); // implemented in board.h
  SystemCoreClockUpdate();

  // Enable All GPIOs clocks
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();

  #ifdef __HAL_RCC_GPIOE_CLK_ENABLE
  __HAL_RCC_GPIOE_CLK_ENABLE();
  #endif
  #ifdef __HAL_RCC_GPIOG_CLK_ENABLE
  __HAL_RCC_GPIOG_CLK_ENABLE();
  #endif
  #ifdef __HAL_RCC_GPIOI_CLK_ENABLE
  __HAL_RCC_GPIOI_CLK_ENABLE();
  #endif

  trace_etm_init();

  #if CFG_TUSB_OS == OPT_OS_NONE
  // 1ms tick timer
  SysTick_Config(SystemCoreClock / 1000);
  #elif CFG_TUSB_OS == OPT_OS_FREERTOS
  // Explicitly disable systick to prevent its ISR from running before scheduler start
  SysTick->CTRL &= ~1U;

  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
  NVIC_SetPriority(USB_DRD_FS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
  #endif

  for (uint8_t i = 0; i < TU_ARRAY_SIZE(board_pindef); i++) {
    HAL_GPIO_Init(board_pindef[i].port, &board_pindef[i].pin_init);
  }

  #ifdef UART_ID
  UARTn_CLK_ENABLE();
  HAL_UART_Init(&UartHandle);
  HAL_UARTEx_EnableFifoMode(&UartHandle);
  #endif

  // USB Pins TODO double check USB clock and pin setup
  // Configure USB DM and DP pins. This is optional, and maintained only for user guidance.
  GPIO_InitTypeDef GPIO_InitStruct;
  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* Peripheral clock enable */
  __HAL_RCC_USB_CLK_ENABLE();

  /* Enable VDDUSB */
  #if defined (PWR_USBSCR_USB33DEN)
  HAL_PWREx_EnableVddUSB();
  #endif

  board_init2();

#if CFG_TUH_ENABLED
  board_vbus_set(BOARD_TUH_RHPORT, 1);
#endif
}

//--------------------------------------------------------------------+
// Board porting API
//--------------------------------------------------------------------+

void board_led_write(bool state) {
#ifdef PINID_LED
  board_pindef_t* pindef = &board_pindef[PINID_LED];
  GPIO_PinState pin_state = state == pindef->active_state ? GPIO_PIN_SET : GPIO_PIN_RESET;
  HAL_GPIO_WritePin(pindef->port, pindef->pin_init.Pin, pin_state);
#else
  (void) state;
#endif
}

uint32_t board_button_read(void) {
#ifdef PINID_BUTTON
  board_pindef_t* pindef = &board_pindef[PINID_BUTTON];
  return pindef->active_state == HAL_GPIO_ReadPin(pindef->port, pindef->pin_init.Pin);
#else
  return 0;
#endif
}

size_t board_get_unique_id(uint8_t id[], size_t max_len) {
  (void) max_len;
  uint32_t* id32 = (uint32_t*) (uintptr_t) id;
  uint8_t const len = 12;

  id32[0] = cached_uid[0];
  id32[1] = cached_uid[1];
  id32[2] = cached_uid[2];

  return len;
}

int board_uart_read(uint8_t* buf, int len) {
#ifdef UART_ID
  int count = 0;
  while (count < len) {
    if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_RXNE)) {
      buf[count] = (uint8_t) UartHandle.Instance->RDR;
      count++;
    } else {
      break;
    }
  }
  return count;
#else
  (void) buf; (void) len;
  return 0;
#endif
}

int board_uart_write(void const* buf, int len) {
#ifdef UART_ID
  const uint8_t *p = (const uint8_t *) buf;
  int count = 0;
  while (count < len) {
    if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_TXE)) {
      UartHandle.Instance->TDR = p[count];
      count++;
    } else {
      break;
    }
  }
  return count;
#else
  (void) buf; (void) len;
  return -1;
#endif
}

#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;

void SysTick_Handler(void) {
  system_ticks++;
  HAL_IncTick();
}

uint32_t tusb_time_millis_api(void) {
  return system_ticks;
}

#endif

void HardFault_Handler(void) {
  __asm("BKPT #0\n");
}

// Required by __libc_init_array in startup code if we are compiling using
// -nostdlib/-nostartfiles.
void _init(void) {

}
