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Troubles in connection between STMF4 and a HID device

Question asked by zaidi.oussama on Dec 23, 2016

Hi everyone

This is my first question in this forum, I hope you will not be so agressive with me I am new with microcontrollers.

I am using STM32F407VG discovery as a USB HOST, I connected it to a lazer scanner which reads barcodes, the scanner is considered as a keyboard.

The connection works just fine but I have some issues that I can't define their causes.

First, I can't connect the scanner directly to STM, I need to connect a mouse first, wait until STM  recognize the mouse then I disconnect it and connect the scanner, I don't know why I need to do that but this is the only way to get the scanner connected.

The second issue is that devices take a long time to get connected to STM and some times they don't connect at all, so some times i resolve the problem by take off the supply from STM and putted again, some times i need to run the program again and also I don't know why I need to do that.

So you can imagine if I disconnect the scanner or the STM get off power I need at least 10 minutes to get the connection again.

I did a simple program without interrups,RTOS or using DMA register just I configured the Timer, GPIOs, the USB, I think I have all the files that I need on the library, I don't know the cause of this problem.

This is the code:

#include "defines.h"
#include "tm_stm32f4_usb_hid_host.h"
#include "stm32f4xx.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_tim.h"
#include "misc.h"

#include <stdio.h>
uint16_t PrescalerValue, TimPeriod;
int i;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

uint16_t PrescalerValue ;
uint16_t TimPeriod ;

void Timer4_Config(void)
{

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
// Te=1s
// TimPeriod*(PrescalerValue+1)/F(timer4)=Te; // F(timer4)=84Mhz
PrescalerValue=8399;
TimPeriod=10000;
TIM_TimeBaseStructure.TIM_Period = TimPeriod ;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_Cmd(TIM4 , ENABLE);

}

void GPIO_Config(void)
{

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE );

//Configure LD12---PD15 in output pushpull mode
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;//LD2...LD15
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//Mode Out
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//Fmax=50 MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//Output Push Pull
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//No Pull
//GPIOd Periph initialisation
GPIO_Init(GPIOD,&GPIO_InitStructure);
//Connecter chaque pin au TIM4 en mode AF
//void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF);

}
int main(void) {
TM_USB_HIDHOST_Result_t USB_HID_Status; /* USB HID Host status */
TM_USB_HIDHOST_Keyboard_t tableau [18] ;
/* Initialize system */
SystemInit();
GPIO_Config();//Configuration du GPIO
Timer4_Config();//Configuration du Timer 3

/* Init USB HID */
TM_USB_HIDHOST_Init();

/* Get connected device */
USB_HID_Status = TM_USB_HIDHOST_Device();

while (1)
{
TM_USB_HIDHOST_Process();
USB_HID_Status = TM_USB_HIDHOST_Device();

if ( USB_HID_Status==TM_USB_HIDHOST_Result_KeyboardConnected)
{

for (i=0;i<17;i++)
{
TM_USB_HIDHOST_ReadKeyboard(&tableau[i]);
     if (tableau[i].ButtonStatus == TM_USB_HIDHOST_Button_Pressed) {
          if (tableau[i].Button == '5') {
            if ( tableau[i+1].Button == '1')
               {
                    GPIO_ResetBits( GPIOD, GPIO_Pin_14);
                    GPIO_ResetBits( GPIOD, GPIO_Pin_13);
                    GPIO_ResetBits( GPIOD, GPIO_Pin_12);
                    GPIO_SetBits( GPIOD, GPIO_Pin_15);

                 }

             if (tableau[i+1].Button == '0')
                 {
                     GPIO_ResetBits( GPIOD, GPIO_Pin_12);
                     GPIO_ResetBits( GPIOD, GPIO_Pin_13);
                     GPIO_ResetBits( GPIOD, GPIO_Pin_15);
                     GPIO_SetBits( GPIOD, GPIO_Pin_14); }
                 }
          if (tableau[i].Button == '4') {
             if (tableau[i+1].Button == '1')
                {
                    GPIO_ResetBits( GPIOD, GPIO_Pin_12);
                    GPIO_ResetBits( GPIOD, GPIO_Pin_14);
                    GPIO_ResetBits( GPIOD, GPIO_Pin_15);
                   GPIO_SetBits( GPIOD, GPIO_Pin_13);

                }

             if (tableau[i+1].Button == '0')
                {
                  GPIO_ResetBits( GPIOD, GPIO_Pin_15);
                  GPIO_ResetBits( GPIOD, GPIO_Pin_13);
                  GPIO_ResetBits( GPIOD, GPIO_Pin_14);
                  GPIO_SetBits( GPIOD, GPIO_Pin_12);

                 }

}
if (USB_HID_Status==TM_USB_HIDHOST_Result_MouseConnected)
{
for(i=0;i<4200000;i++)
GPIO_SetBits( GPIOD, GPIO_Pin_15);
for(i=0;i<4200000;i++)
GPIO_ResetBits( GPIOD, GPIO_Pin_15); }

if (USB_HID_Status==TM_USB_HIDHOST_Result_Disconnected)
{
for(i=0;i<4200000;i++)
GPIO_SetBits( GPIOD, GPIO_Pin_12);
for(i=0;i<4200000;i++)
GPIO_ResetBits( GPIOD, GPIO_Pin_12); }
} }

Thank you for helping me. 

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