STM32F407 and HC-05(bluetooth)

[jota]

Posted on September 28, 2015 at 19:00

Hello! First of all let me start by telling you that i'm a trully beginner.

So, im trying to receive a string like ''hello world'' in the termite .I already can see the bluetooth hc-05 though my phone. I can connect the bluetooth on the termite however i cant receave anything from it.My code is the following:/* Includes ------------------------------------------------------------------*/#include ''stm32f4_discovery.h''#include ''stm32f4xx_gpio.h''#include ''stm32f4xx_rcc.h''#include ''stm32f4xx.h''#include ''stm32f4xx_usart.h''#include <string.h>#include <stdio.h>GPIO_InitTypeDef              GPIO_InitStructure;USART_InitTypeDef             USART_InitStructure;void delay(unsigned long tempo) {                                                    volatile unsigned long i;                                                    i = tempo;                                                   do i-- ;                                                   while (i !=0);                                                  }void USART_put(USART_TypeDef* USARTx, volatile char *s){    while(*s){        // wait until data register is empty        while( !(USARTx->SR & 0x00000040) );        USART_SendData(USARTx, *s);        while(USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET)                {                }        *s++;    }}void GPIO_USART_Configuration(void){     RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);     /* Configure USART Tx as alternate function  */       GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;       GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;       GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;       GPIO_Init(GPIOC, &GPIO_InitStructure);     /* Connect PXx to USARTx_Tx*/       GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3); } void USART3_Configuration(void) {         USART_InitStructure.USART_BaudRate = 38400;         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_Tx;         USART_Init(USART3, &USART_InitStructure);         USART_Cmd(USART3, ENABLE); // enable USART2 }void usart_inisialisasi() {     GPIO_USART_Configuration();     USART3_Configuration(); }int main(void) {SystemInit();usart_inisialisasi();}(obviously i tried to use usart_put but i cant use it correctly i think)any help would be appreciated.Thank you,

[Tesla DeLorean]

Posted on September 28, 2015 at 19:32

So you're got something like

while(1) USART_put(USART3, ''Hello World!\r\n''); Right? Have you configured the HC-05 to be at 38400 baud, at it's end not the phone's end? Or is this it's default?

[jota]

Posted on September 28, 2015 at 19:42

yes my code was something like that but i cant put it working. the baud-rate is correct . maybe something with the connections on the stm32 to the bluetooth? i only connected the bluetooth rx - stm usart3 tx ; bluetooth tx - stm usart3 rx ; vcc and ground. 

thanks for trying to help and replying me . really really aprecciated!