usb.c

#include "usb.h"
#include "stm32f30x.h"
#include "hw_config.h"
#include "usb_desc.h"
#include "usb_pwr.h"
#include "usb_istr.h"
#include "platform_config.h"
#include "stm32f3_discovery.h"

__IO uint32_t USBConnectTimeOut = 100;

static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len);

void USBHID_Init(void)
{
    /* Enable the PWR clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

    /* Enable the SYSCFG module clock (used for the USB disconnect feature) */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

    /* Enable the USB disconnect GPIO clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIO_DISCONNECT, ENABLE);

    /*Set PA11,12 as IN - USB_DM,DP*/

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
    GPIO_InitTypeDef  GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);


    /*SET PA11,12 for USB: USB_DM,DP*/
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_14);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_14);


#if defined(USB_USE_EXTERNAL_PULLUP)
    /* Enable the USB disconnect GPIO clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIO_DISCONNECT, ENABLE);

    /* USB_DISCONNECT used as USB pull-up */
    GPIO_InitStructure.GPIO_Pin = USB_DISCONNECT_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(USB_DISCONNECT, &GPIO_InitStructure);  
#endif /* USB_USE_EXTERNAL_PULLUP */

    /* Configure the EXTI line 18 connected internally to the USB IP */
    EXTI_ClearITPendingBit(EXTI_Line18);
    EXTI_InitTypeDef EXTI_InitStructure;
    EXTI_InitStructure.EXTI_Line = EXTI_Line18; /*USB resume from suspend mode*/
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    EXTI_ClearITPendingBit(USER_BUTTON_EXTI_LINE);



    /* set USB clock */
    /* USBCLK = PLLCLK = 48 MHz */
    RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);

    /* Enable USB clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);


    USB_Interrupts_Config();

    USB_Init();

    while ((bDeviceState != CONFIGURED) && (USBConnectTimeOut != 0))
    {}
}

/**
  * @brief  Configures the USB interrupts.
  * @param  None
  * @retval None
  */
void USB_Interrupts_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* 2 bit for pre-emption priority, 2 bits for subpriority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

  /* Enable the USB interrupt */
#if defined (USB_INT_DEFAULT)
  NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
#endif
#if defined (USB_INT_REMAP)
  NVIC_InitStructure.NVIC_IRQChannel = USB_LP_IRQn;
#endif 
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  /* Enable the USB Wake-up interrupt */
#if defined (USB_INT_DEFAULT)
  NVIC_InitStructure.NVIC_IRQChannel = USBWakeUp_IRQn;
#endif
#if defined (USB_INT_REMAP)  
  NVIC_InitStructure.NVIC_IRQChannel = USBWakeUp_RMP_IRQn;
#endif  
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);      

  /* Enable the Key EXTI line Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USER_BUTTON_EXTI_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Software Connection/Disconnection of USB Cable.
  * @param  None
  * @retval None
  */
void USB_Cable_Config (FunctionalState NewState)
{
  if (NewState != DISABLE)
  {
    GPIO_ResetBits(USB_DISCONNECT, USB_DISCONNECT_PIN);
  }
  else
  {
    GPIO_SetBits(USB_DISCONNECT, USB_DISCONNECT_PIN);
  }
}

/**
  * @brief  Decodes the Joystick direction.
  * @param  None
  * @retval The direction value.
  */
uint8_t JoyState(void)
{
  return 0;
  
}

/**
  * @brief  Prepares buffer to be sent containing Joystick event infos.
  * @param  Keys: keys received from terminal.
  * @retval None
  */
void Joystick_Send(uint8_t Keys)
{

}

/**
  * @brief  Create the serial number string descriptor.
  * @param  None.
  * @retval None
  */
void Get_SerialNum(void)
{
  uint32_t Device_Serial0, Device_Serial1, Device_Serial2;

  Device_Serial0 = *(__IO uint32_t*)(0x1FFFF7E8);
  Device_Serial1 = *(__IO uint32_t*)(0x1FFFF7EC);
  Device_Serial2 = *(__IO uint32_t*)(0x1FFFF7F0);
  
  Device_Serial0 += Device_Serial2;

  if (Device_Serial0 != 0)
  {
    IntToUnicode (Device_Serial0, &Joystick_StringSerial[2] , 8);
    IntToUnicode (Device_Serial1, &Joystick_StringSerial[18], 4);
  }
}


/**
  * @brief  Convert Hex 32Bits value into char.
  * @param  value: Data to be converted.
  * @param  pbuf: pointer to buffer.  
  * @param  len: Data length.   
  * @retval None
  */
static void IntToUnicode (uint32_t value , uint8_t *pbuf , uint8_t len)
{
  uint8_t idx = 0;
  
  for( idx = 0 ; idx < len ; idx ++)
  {
    if( ((value >> 28)) < 0xA )
    {
      pbuf[ 2* idx] = (value >> 28) + '0';
    }
    else
    {
      pbuf[2* idx] = (value >> 28) + 'A' - 10; 
    }
    
    value = value << 4;
    
    pbuf[ 2* idx + 1] = 0;
  }
}

#if defined (USB_INT_DEFAULT)
void USB_LP_CAN1_RX0_IRQHandler(void)
#elif defined (USB_INT_REMAP)
void USB_LP_IRQHandler(void)
#endif
{
   USB_Istr();
}

#if defined (USB_INT_DEFAULT)
void USBWakeUp_IRQHandler(void)
#elif defined (USB_INT_REMAP)
void USBWakeUp_RMP_IRQHandler(void)
#endif
{
  /* Initiate external resume sequence (1 step) */
  Resume(RESUME_EXTERNAL);  
  EXTI_ClearITPendingBit(EXTI_Line18);
}