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stm32f4 read data from pc's com port

Question asked by ali.med on May 10, 2015
Latest reply on May 11, 2015 by Clive One
I managed to send via stm32f4 data using usb and vcp.What i am trying to do now is to read data from pc .In order to check what is read through usb i send it again to the pc.
My problem is that the board seems to ignore the data sent by the pc .
I am using micro c 's serial terminal to read and write data.
Can you help me please?


#define HSE_VALUE ((uint32_t)8000000) /* STM32 discovery uses a 8Mhz external crystal */
 
#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"
 
volatile uint32_t ticker, downTicker;
 
/*
 * 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;
 
 
void init();
void ColorfulRingOfDeath(void);
 
/*
 * 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 SysTick_Handler(void);
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
 
 
 
int main(void)
{ uint8_t theByte[1];
theByte[0]=123;
//theByte[1]=95;
    /* Set up the system clocks */
    SystemInit();
 
    /* Initialize USB, IO, SysTick, and all those other things you do in the morning */
    init();
 
GPIO_SetBits(GPIOD,GPIO_Pin_14);
    while (1)
    {
 
 
     
    VCP_get_string(&theByte);
 
     VCP_send_buffer(&theByte, 1);
 
        }
    }
 
 
 
 
void init()
{
    /* STM32F4 discovery LEDs */
    GPIO_InitTypeDef LED_Config;
 
    /* Always remember to turn on the peripheral clock...  If not, you may be up till 3am debugging... */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    LED_Config.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
    LED_Config.GPIO_Mode = GPIO_Mode_OUT;
    LED_Config.GPIO_OType = GPIO_OType_PP;
    LED_Config.GPIO_Speed = GPIO_Speed_25MHz;
    LED_Config.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &LED_Config);
 
 
 
    /* Setup SysTick or CROD! */
    if (SysTick_Config(SystemCoreClock / 1000))
    {
        ColorfulRingOfDeath();
    }
 
 
    /* Setup USB */
    USBD_Init(&USB_OTG_dev,
            USB_OTG_FS_CORE_ID,
                &USR_desc,
                &USBD_CDC_cb,
                &USR_cb);
 
    return;
}
 
/*
 * Call this to indicate a failure.  Blinks the STM32F4 discovery LEDs
 * in sequence.  At 168Mhz, the blinking will be very fast - about 5 Hz.
 * Keep that in mind when debugging, knowing the clock speed might help
 * with debugging.
 */
void ColorfulRingOfDeath(void)
{
    uint16_t ring = 1;
    while (1)
    {
        uint32_t count = 0;
        while (count++ < 500000);
 
        GPIOD->BSRRH = (ring << 12);
        ring = ring << 1;
        if (ring >= 1<<4)
        {
            ring = 1;
        }
        GPIOD->BSRRL = (ring << 12);
    }
}
 
/*
 * Interrupt Handlers
 */
 
void SysTick_Handler(void)
{
    ticker++;
    if (downTicker > 0)
    {
        downTicker--;
    }
}
 
void NMI_Handler(void)       {}
void HardFault_Handler(void) { ColorfulRingOfDeath(); }
void MemManage_Handler(void) { ColorfulRingOfDeath(); }
void BusFault_Handler(void)  { ColorfulRingOfDeath(); }
void UsageFault_Handler(void){ ColorfulRingOfDeath(); }
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);
}
 

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