hw_config.c

/**
  ******************************************************************************
  * @file    hw_config.c
  * @author  MCD Application Team
  * @version V4.0.0
  * @date    21-January-2013
  * @brief   Hardware Configuration & Setup
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */


#include "stm32_it.h"
#include "usb_lib.h"
#include "usb_prop.h"
#include "usb_desc.h"
#include "hw_config.h"
#include "usb_pwr.h"


USART_InitTypeDef USART_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
uint8_t  USART_Rx_Buffer [USART_RX_DATA_SIZE]; 
uint32_t USART_Rx_ptr_in = 0;
uint32_t USART_Rx_ptr_out = 0;
uint32_t USART_Rx_length  = 0;

uint8_t  USB_Tx_State = 0;

extern LINE_CODING linecoding;


typedef enum
{
  COM1 = 0,
  COM2 = 1
} COM_TypeDef;

#define COMn                             2

USART_TypeDef* COM_USART[COMn] = {EVAL_COM1, EVAL_COM1};

GPIO_TypeDef* COM_TX_PORT[COMn] = {EVAL_COM1_TX_GPIO_PORT, EVAL_COM1_TX_GPIO_PORT};

GPIO_TypeDef* COM_RX_PORT[COMn] = {EVAL_COM1_RX_GPIO_PORT, EVAL_COM1_RX_GPIO_PORT};

const uint32_t COM_USART_CLK[COMn] = {EVAL_COM1_CLK, EVAL_COM1_CLK};

const uint32_t COM_TX_PORT_CLK[COMn] = {EVAL_COM1_TX_GPIO_CLK, EVAL_COM1_TX_GPIO_CLK};

const uint32_t COM_RX_PORT_CLK[COMn] = {EVAL_COM1_RX_GPIO_CLK, EVAL_COM1_RX_GPIO_CLK};

const uint16_t COM_TX_PIN[COMn] = {EVAL_COM1_TX_PIN, EVAL_COM1_TX_PIN};

const uint16_t COM_RX_PIN[COMn] = {EVAL_COM1_RX_PIN, EVAL_COM1_RX_PIN};


static void intToUnicode(uint32_t value, uint8_t *buffer, uint8_t length)
{
    uint8_t i = 0;

    for (i = 0; i < length; i++)
    {
        if ((value >> 28) < 10)
        {
            buffer[i << 1] = (value >> 28) + '0';
        }
        else
        {
            buffer[i << 1] = (value >> 28) + 'A' - 10; 
        }

        value = value << 4;

        buffer[(i << 1) + 1] = 0;
    }
}

void STM_EVAL_COMInit(COM_TypeDef COM, USART_InitTypeDef* USART_InitStruct)
{
	if (COM != COM1)
		return;

  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable GPIO clock */
  RCC_APB2PeriphClockCmd(COM_TX_PORT_CLK[COM] | COM_RX_PORT_CLK[COM] | RCC_APB2Periph_AFIO, ENABLE);

  if (COM == COM1)
  {
    RCC_APB2PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
  }
  else
  {
    /* Enable the USART2 Pins Software Remapping */
    //GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
    //RCC_APB1PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
  }

  /* Configure USART Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Pin = COM_TX_PIN[COM];
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(COM_TX_PORT[COM], &GPIO_InitStructure);


  /* Configure USART Rx as input floating */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[COM];
  GPIO_Init(COM_RX_PORT[COM], &GPIO_InitStructure);

  /* USART configuration */
  USART_Init(COM_USART[COM], USART_InitStruct);

  /* Enable USART */
  USART_Cmd(COM_USART[COM], ENABLE);
}

void configureUsbSystem(void)
{
    // Configure the EXTI line 18 connected internally to the USB IP
    EXTI_ClearITPendingBit(EXTI_Line18);
    EXTI_InitStructure.EXTI_Line = EXTI_Line18; 
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);
}

void Enter_LowPowerMode(void)
{
    bDeviceState = SUSPENDED;
}

void Leave_LowPowerMode(void)
{
    DEVICE_INFO *pInfo = &Device_Info;

    if (pInfo->Current_Configuration != 0)
    {
        bDeviceState = CONFIGURED;
    }
    else
    {
        bDeviceState = ATTACHED;
    }
    
    SystemInit();
}

void configureUsbInterrupts(void)
{
    NVIC_InitTypeDef NVIC_InitStructure; 

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

    NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
    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
    NVIC_InitStructure.NVIC_IRQChannel = USBWakeUp_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_Init(&NVIC_InitStructure);

    // Enable USART Interrupt
    NVIC_InitStructure.NVIC_IRQChannel = EVAL_COM1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_Init(&NVIC_InitStructure);
}

void configureUsbCable(FunctionalState state)
{
#if !defined(USE_STM32_NO_EVAL)
  if (state != DISABLE)
  {
    GPIO_ResetBits(USB_DISCONNECT, USB_DISCONNECT_PIN);
  }
  else
  {
    GPIO_SetBits(USB_DISCONNECT, USB_DISCONNECT_PIN);
  }
#endif /* STM32L1XX_MD */
}

/*******************************************************************************
* Function Name  :  setUsartDefaultSettings.
* Description    :  configure the EVAL_COM1 with default values.
* Input          :  None.
* Return         :  None.
*******************************************************************************/
void setUsartDefaultSettings(void)
{
  /* EVAL_COM1 default configuration */
  /* EVAL_COM1 configured as follow:
        - BaudRate = 9600 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - Parity Odd
        - Hardware flow control disabled
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 921600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  /* Configure and enable the USART */
  STM_EVAL_COMInit(COM1, &USART_InitStructure);

  /* Enable the USART Receive interrupt */
  USART_ITConfig(EVAL_COM1, USART_IT_RXNE, ENABLE);
}

bool USART_Config(void)
{

  /* set the Stop bit*/
  switch (linecoding.format)
  {
    case 0:
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      break;
    case 1:
      USART_InitStructure.USART_StopBits = USART_StopBits_1_5;
      break;
    case 2:
      USART_InitStructure.USART_StopBits = USART_StopBits_2;
      break;
    default :
    {
      setUsartDefaultSettings();
      return (FALSE);
    }
  }

  /* set the parity bit*/
  switch (linecoding.paritytype)
  {
    case 0:
      USART_InitStructure.USART_Parity = USART_Parity_No;
      break;
    case 1:
      USART_InitStructure.USART_Parity = USART_Parity_Even;
      break;
    case 2:
      USART_InitStructure.USART_Parity = USART_Parity_Odd;
      break;
    default :
    {
      setUsartDefaultSettings();
      return (FALSE);
    }
  }

  /*set the data type : only 8bits and 9bits is supported */
  switch (linecoding.datatype)
  {
    case 0x07:
      /* With this configuration a parity (Even or Odd) should be set */
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      break;
    case 0x08:
      if (USART_InitStructure.USART_Parity == USART_Parity_No)
      {
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      }
      else 
      {
        USART_InitStructure.USART_WordLength = USART_WordLength_9b;
      }
      
      break;
    default :
    {
      setUsartDefaultSettings();
      return (FALSE);
    }
  }

  USART_InitStructure.USART_BaudRate = linecoding.bitrate;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
 
  /* Configure and enable the USART */
  STM_EVAL_COMInit(COM1, &USART_InitStructure);

  return (TRUE);
}

/*******************************************************************************
* Function Name  : USB_To_USART_Send_Data.
* Description    : send the received data from USB to the UART 0.
* Input          : data_buffer: data address.
                   Nb_bytes: number of bytes to send.
* Return         : none.
*******************************************************************************/
void USB_To_USART_Send_Data(uint8_t* data_buffer, uint8_t Nb_bytes)
{
  
  uint32_t i;
  
  for (i = 0; i < Nb_bytes; i++)
  {
    USART_SendData(EVAL_COM1, *(data_buffer + i));
    while(USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TXE) == RESET); 
  }  
}

/*******************************************************************************
* Function Name  : Handle_USBAsynchXfer.
* Description    : send data to USB.
* Input          : None.
* Return         : none.
*******************************************************************************/
void Handle_USBAsynchXfer (void)
{
  
  uint16_t USB_Tx_ptr;
  uint16_t USB_Tx_length;
  
  if(USB_Tx_State != 1)
  {
    if (USART_Rx_ptr_out == USART_RX_DATA_SIZE)
    {
      USART_Rx_ptr_out = 0;
    }
    
    if(USART_Rx_ptr_out == USART_Rx_ptr_in) 
    {
      USB_Tx_State = 0; 
      return;
    }
    
    if(USART_Rx_ptr_out > USART_Rx_ptr_in) /* rollback */
    { 
      USART_Rx_length = USART_RX_DATA_SIZE - USART_Rx_ptr_out;
    }
    else 
    {
      USART_Rx_length = USART_Rx_ptr_in - USART_Rx_ptr_out;
    }
    
    if (USART_Rx_length > VIRTUAL_COM_PORT_DATA_SIZE)
    {
      USB_Tx_ptr = USART_Rx_ptr_out;
      USB_Tx_length = VIRTUAL_COM_PORT_DATA_SIZE;
      
      USART_Rx_ptr_out += VIRTUAL_COM_PORT_DATA_SIZE;	
      USART_Rx_length -= VIRTUAL_COM_PORT_DATA_SIZE;	
    }
    else
    {
      USB_Tx_ptr = USART_Rx_ptr_out;
      USB_Tx_length = USART_Rx_length;
      
      USART_Rx_ptr_out += USART_Rx_length;
      USART_Rx_length = 0;
    }
    USB_Tx_State = 1; 
    UserToPMABufferCopy(&USART_Rx_Buffer[USB_Tx_ptr], ENDP2_TXADDR, USB_Tx_length);
    SetEPTxCount(ENDP2, USB_Tx_length);
    SetEPTxValid(ENDP2);
  }  
  
}

void USART_To_USB_Send_Data(void)
{
	//USART_ReceiveData(EVAL_COM1); return;
  
  if (linecoding.datatype == 7)
  {
    USART_Rx_Buffer[USART_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1) & 0x7F;
  }
  else if ((linecoding.datatype == 8) || 1)
  {
    USART_Rx_Buffer[USART_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1);
  }
  
  USART_Rx_ptr_in++;
  
  /* To avoid buffer overflow */
  if(USART_Rx_ptr_in == USART_RX_DATA_SIZE)
  {
    USART_Rx_ptr_in = 0;
  }
}

void fillSerialNumber(void)
{
    uint32_t serialNumber0, serialNumber1, serialNumber2;

    serialNumber0 = *(uint32_t*) ID1;
    serialNumber1 = *(uint32_t*) ID2;
    serialNumber2 = *(uint32_t*) ID3;  

    serialNumber0 += serialNumber2;

    if (serialNumber0 != 0)
    {
        intToUnicode(serialNumber0, &vcpStringSerial[2], 8);
        intToUnicode(serialNumber1, &vcpStringSerial[18], 4);
    }
}