/**
 ******************************************************************************
 *
 * @file       pios_sys.c  
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 * 	        Parts by Thorsten Klose (tk@midibox.org) (tk@midibox.org)
 * @brief      Sets up basic system hardware, functions are called from Main.
 * @see        The GNU Public License (GPL) Version 3
 * @defgroup   PIOS_SYS System Functions
 * @{
 *
 *****************************************************************************/
/* 
 * This program is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 3 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */


/* Project Includes */
#include "pios.h"

#if !defined(PIOS_DONT_USE_SYS)


/* Private Function Prototypes */
void NVIC_Configuration(void);
void SysTick_Handler(void);

/* Local Macros */
#define MEM8(addr)  (*((volatile uint8_t  *)(addr)))

/**
* Initialises all system peripherals
*/
void PIOS_SYS_Init(void)
{
	/* Setup STM32 system (RCC, clock, PLL and Flash configuration) - CMSIS Function */
	SystemInit();
	
	/* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);

	/* Activate pull-ups on all pins by default */
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_StructInit(&GPIO_InitStructure);
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin = 0xffff;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	GPIO_Init(GPIOD, &GPIO_InitStructure);
#if (PIOS_USB_ENABLED)
	GPIO_InitStructure.GPIO_Pin = 0xffff & ~GPIO_Pin_11 & ~GPIO_Pin_12; /* Exclude USB pins */
#endif
	GPIO_Init(GPIOA, &GPIO_InitStructure);

#if (PIOS_USB_ENABLED)
	/*  Ensure that pull-up is active on detect pin */
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin = PIOS_USB_DETECT_GPIO_PIN;
	GPIO_Init(PIOS_USB_DETECT_GPIO_PORT, &GPIO_InitStructure);
#endif

	/* Initialise Basic NVIC */
	NVIC_Configuration();
	
	/* Initialise LEDs */
	PIOS_LED_Init();
}

/**
* Returns the serial number as a string
* param[out] str pointer to a string which can store at least 32 digits + zero terminator!
* (24 digits returned for STM32)
* return < 0 if feature not supported
*/
int32_t PIOS_SYS_SerialNumberGet(char *str)
{
	int i;

	/* Stored in the so called "electronic signature" */
	for(i=0; i<24; ++i) {
		uint8_t b = MEM8(0x1ffff7e8 + (i/2));
		if( !(i & 1) )
		b >>= 4;
		b &= 0x0f;

		str[i] = ((b > 9) ? ('A'-10) : '0') + b;
	}
	str[i] = 0;

	/* No error */
	return 0;
}

/**
* Configures Vector Table base location and SysTick
*/
void NVIC_Configuration(void)
{
	/* Set the Vector Table base address as specified in .ld file */
	NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

	/* 4 bits for Interrupt priorities so no sub priorities */
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

	/* Configure HCLK clock as SysTick clock source. */
	SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
}

#ifdef USE_FULL_ASSERT
/**
* Reports the name of the source file and the source line number
*   where the assert_param error has occurred.
* \param[in]  file pointer to the source file name
* \param[in]  line assert_param error line source number
* \retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
	/* When serial debugging is implemented, use something like this. */
	/* printf("Wrong parameters value: file %s on line %d\r\n", file, line); */

	/* Setup the LEDs to Alternate */
	PIOS_LED_On(LED1);
	PIOS_LED_Off(LED2);

	/* Infinite loop */
	while (1)
	{
		PIOS_LED_Toggle(LED1);
		PIOS_LED_Toggle(LED2);
		for(int i = 0; i < 1000000; i++);
	}
}
#endif

#endif