/* 
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 *
 * 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.
 */

#include "chip.h"
#include "../board.h"

#define LED_PORT              1
#define LED_PIN               24
#define LED_STATE_ON          0

// Wake up Switch
#define BUTTON_PORT           0
#define BUTTON_PIN            16
#define BUTTON_STATE_ACTIVE   0

/* System oscillator rate and RTC oscillator rate */
const uint32_t OscRateIn = 12000000;
const uint32_t ExtRateIn = 0;

/* Pin muxing table, only items that need changing from their default pin
   state are in this table. Not every pin is mapped. */
/* IOCON pin definitions for pin muxing */
typedef struct {
	uint32_t port : 8;			/* Pin port */
	uint32_t pin : 8;			/* Pin number */
	uint32_t modefunc : 16;		/* Function and mode */
} PINMUX_GRP_T;

static const PINMUX_GRP_T pinmuxing[] =
{
  {0,  3, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGMODE_EN)}, // USB VBUS
  {0,  6, (IOCON_FUNC1 | IOCON_MODE_INACT)},		/* PIO0_6 used for USB_CONNECT */

  {0, 18, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGMODE_EN)}, // UART0 RX
  {0, 19, (IOCON_FUNC1 | IOCON_MODE_INACT | IOCON_DIGMODE_EN)}, // UART0 TX
};

/* Setup system clocking */
static void SystemSetupClocking(void)
{
	volatile int i;

	/* Powerup main oscillator */
	Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSOSC_PD);

	/* Wait 200us for OSC to be stablized, no status
	   indication, dummy wait. */
	for (i = 0; i < 0x100; i++) {}

	/* Set system PLL input to main oscillator */
	Chip_Clock_SetSystemPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);

	/* Power down PLL to change the PLL divider ratio */
	Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_SYSPLL_PD);

	/* Setup PLL for main oscillator rate (FCLKIN = 12MHz) * 4 = 48MHz
	   MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
	   FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
	   FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
	Chip_Clock_SetupSystemPLL(3, 1);

	/* Powerup system PLL */
	Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSPLL_PD);

	/* Wait for PLL to lock */
	while (!Chip_Clock_IsSystemPLLLocked()) {}

	/* Set system clock divider to 1 */
	Chip_Clock_SetSysClockDiv(1);

	/* Setup FLASH access to 3 clocks */
	Chip_FMC_SetFLASHAccess(FLASHTIM_50MHZ_CPU);

	/* Set main clock source to the system PLL. This will drive 48MHz
	   for the main clock and 48MHz for the system clock */
	Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLOUT);

	/* Set USB PLL input to main oscillator */
	Chip_Clock_SetUSBPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
	/* Setup USB PLL  (FCLKIN = 12MHz) * 4 = 48MHz
	   MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
	   FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
	   FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
	Chip_Clock_SetupUSBPLL(3, 1);

	/* Powerup USB PLL */
	Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPLL_PD);

	/* Wait for PLL to lock */
	while (!Chip_Clock_IsUSBPLLLocked()) {}
}

// Invoked by startup code
void SystemInit(void)
{
  SystemSetupClocking();
  Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_RAM1);

  /* Enable IOCON clock */
  Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
  for (uint32_t i = 0; i < (sizeof(pinmuxing) / sizeof(PINMUX_GRP_T)); i++)
  {
		Chip_IOCON_PinMuxSet(LPC_IOCON, pinmuxing[i].port, pinmuxing[i].pin, pinmuxing[i].modefunc);
	}
}

void board_init(void)
{
  SystemCoreClockUpdate();

#if CFG_TUSB_OS == OPT_OS_NONE
  // 1ms tick timer
  SysTick_Config(SystemCoreClock / 1000);
#elif CFG_TUSB_OS == OPT_OS_FREERTOS
  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
  NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
#endif

  Chip_GPIO_Init(LPC_GPIO);

  // LED
  Chip_GPIO_SetPinDIROutput(LPC_GPIO, LED_PORT, LED_PIN);

  // Button
  Chip_GPIO_SetPinDIRInput(LPC_GPIO, BUTTON_PORT, BUTTON_PIN);

  // USB: Setup PLL clock, and power
	/* enable USB main clock */
	Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
	/* Enable AHB clock to the USB block and USB RAM. */
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USBRAM);
	/* power UP USB Phy */
	Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPAD_PD);
}

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

void board_led_write(bool state)
{
  Chip_GPIO_SetPinState(LPC_GPIO, LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
}

uint32_t board_button_read(void)
{
  return BUTTON_STATE_ACTIVE == Chip_GPIO_GetPinState(LPC_GPIO, BUTTON_PORT, BUTTON_PIN);
}

int board_uart_read(uint8_t* buf, int len)
{
  (void) buf; (void) len;
  return 0;
}

int board_uart_write(void const * buf, int len)
{
  (void) buf; (void) len;
  return 0;
}

#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;
void SysTick_Handler (void)
{
  system_ticks++;
}

uint32_t board_millis(void)
{
  return system_ticks;
}
#endif