STM32与SIM900A发送短信（三）

STM32通过SIM900A发送短信

目前本人初始化的为串口3，具体代码初始化如下：

#include "sys.h"
#include "usart3.h"	 
#include "stdarg.h"	 	 
#include "stdio.h"	 	 
#include "string.h"


/************************************************
STM32串口3：            XX模块
		PB10-------------RX 
		PB11-------------TX
************************************************/
void uart3_init(u32 bound)
{
   

	NVIC_InitTypeDef NVIC_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);	// GPIOB时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //串口3时钟使能
 
 	USART_DeInit(USART3);  //复位串口3
		 //USART3_TX   PB10
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB10
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
  GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化PB10
   
    //USART3_RX	  PB11
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOB, &GPIO_InitStructure);  //初始化PB11
	
	USART_InitStructure.USART_BaudRate = bound;//波特率一般设置为9600;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
	USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
	USART_InitStructure.USART_Parity =USART_Parity_No;//无奇偶校验位USART_Parity_No
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式
  
	USART_Init(USART3, &USART_InitStructure); //初始化串口	3
  
 
	USART_Cmd(USART3, ENABLE);                    //使能串口 
	
	//使能接收中断
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启中断   
	
	//设置中断优先级
	NVIC_InitStructure.</