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stm32f100c8 and ublox leon g100 USART communication

Question asked by nazuhin on Oct 4, 2012
Latest reply on Dec 14, 2012 by nazuhin
hi all,i am recently working on a project that sending AT command to gsm module from stm32f100c8  via usart and receiving response with interrupt but i am very confused about usart interfaces.i cant receive response from gsm module.i am using stm32vl discovery and ublox leon g100 gsm module usart1 and usart3 and terminal.It sends me back same string.i send "AT" and i want to get "OK" response from module.please help where am i wrong?here is my code :

/*----------------------------------------------*/
/*----------------------------------------------*/
#include "stm32f10x.h"
#include "stdio.h"
#include "string.h"
/*----------------------------------------------*/
/*---------function prototypes------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void USART_Configuration(void);
void ResetModule(void);
void USART_SendCommand(unsigned char *s);
/*------------------------------------------------*/
/*-------------global variables-------------------*/
unsigned char command[]="AT\0\r\n";
char response[50];
int res_index=0;
unsigned char r;

/*----------------------------------------------*/
/*----------RCC configurations------------------*/
void RCC_Configuration(void){
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
}
/*----------------------------------------------*/
/*----------GPIO configurations------------------*/
void GPIO_Configuration(void){
GPIO_InitTypeDef GPIO_InitStructure;

/* Configuring USART1_Tx as 'alternate function push-pull' */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configuring USART1_Rx as 'input floating' */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configuring USART3_Tx as 'alternate function push-pull' */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configuring USART3_Rx as 'input floating' */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/* reset the module*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure );
}
/*----------------------------------------------*/
/*----------USART configurations----------------*/
void USART_Configuration(void){
USART_InitTypeDef USART_InitStructure;

USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;


USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);

USART_Init(USART3, &USART_InitStructure);
USART_Cmd(USART3, ENABLE);

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

}
/*----------------------------------------------*/
/*----------NVIC configurations-----------------*/
void NVIC_Configuration(void){
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*----------------------------------------------*/
/*----------RESET module-----------*/
void ResetModule(void){

long int n;
//reset 
GPIO_SetBits(GPIOB,GPIO_Pin_13);
for(n = 0;n < 10000000;n++); 
GPIO_ResetBits(GPIOB,GPIO_Pin_13);

for(n = 0;n < 30000000;n++);

//power
GPIO_SetBits(GPIOB,GPIO_Pin_12);
for(n = 0;n < 10000000;n++);
GPIO_ResetBits(GPIOB,GPIO_Pin_12);
}
/*----------------------------------------------*/
/*----------Main function-----------------------*/
int main(){

RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
NVIC_Configuration();
ResetModule();
USART_SendCommand(command);

while(1){
}
}
/*----------------------------------------------*/
/*----------Send command------------------------*/
void USART_SendCommand(unsigned char *s)
{
while(*s)
{

//while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
//USART_SendData(USART1, *s);

while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);
USART_SendData(USART3, *s++);


}
}
/*----------------------------------------------*/
/*----------Receive character from USART3-------*/
void USART3_IRQHandler(void){ 

r=USART_ReceiveData(USART3);
response[res_index]=r;
res_index++;

}
/*----------------------------------------------*/
/*--------------------------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------------------------*/

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