/*---------------------------------------------------------------------------*\

  FILE........: stm32f4_usb_vcp.c
  AUTHOR......: xenovacivus
  DATE CREATED: 3 Sep 2014

  USB Virtual COM Port (VCP) module adapted from code I found here:

    https://github.com/xenovacivus/STM32DiscoveryVCP

\*---------------------------------------------------------------------------*/

#include "stm32f4xx_conf.h"
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_exti.h"
#include "usbd_cdc_core.h"
#include "usbd_usr.h"
#include "usbd_desc.h"
#include "usbd_cdc_vcp.h"
#include "usb_dcd_int.h"
#include "sm1000_leds_switches.h"
#include "stm32f4_usb_vcp.h"

/*
 * The USB data must be 4 byte aligned if DMA is enabled. This macro handles
 * the alignment, if necessary (it's actually magic, but don't tell anyone).
 */
__ALIGN_BEGIN USB_OTG_CORE_HANDLE  USB_OTG_dev __ALIGN_END;


/*
 * Define prototypes for interrupt handlers here. The conditional "extern"
 * ensures the weak declarations from startup_stm32f4xx.c are overridden.
 */
#ifdef __cplusplus
 extern "C" {
#endif

void NMI_Handler(void);
void HardFault_Handler(void);
void MemManage_Handler(void);
void BusFault_Handler(void);
void UsageFault_Handler(void);
void SVC_Handler(void);
void DebugMon_Handler(void);
void PendSV_Handler(void);
void OTG_FS_IRQHandler(void);
void OTG_FS_WKUP_IRQHandler(void);

#ifdef __cplusplus
}
#endif


void usb_vcp_init() {
	/* Setup USB */
	USBD_Init(&USB_OTG_dev,
	            USB_OTG_FS_CORE_ID,
	            &USR_desc,
	            &USBD_CDC_cb,
	            &USR_cb);
}


/*
 * Interrupt Handlers
 */

void NMI_Handler(void)       {}
void SVC_Handler(void)       {}
void DebugMon_Handler(void)  {}
void PendSV_Handler(void)    {}

void OTG_FS_IRQHandler(void)
{
  USBD_OTG_ISR_Handler (&USB_OTG_dev);
}

void OTG_FS_WKUP_IRQHandler(void)
{
  if(USB_OTG_dev.cfg.low_power)
  {
    *(uint32_t *)(0xE000ED10) &= 0xFFFFFFF9 ;
    SystemInit();
    USB_OTG_UngateClock(&USB_OTG_dev);
  }
  EXTI_ClearITPendingBit(EXTI_Line18);
}