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uart.c. n! e. [/ Y6 I: K U
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/ Z& b3 l2 V6 J% cvoid USART1_Init(u32 bound){ //串口1初始化并启动
% t/ |* R( p' i6 D- x5 u //GPIO端口设置6 @9 m! V r; ^2 ^$ ^
GPIO_InitTypeDef GPIO_InitStructure;
# M4 W {& }: f5 }) @0 g6 X USART_InitTypeDef USART_InitStructure;+ q/ E" C1 z; U
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RCC_APB2PeriphclockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1,GPIOA时钟
) A; O( [# n# U& u( ` //USART1_TX PA.9! M! ~, ~3 c0 a! B4 v/ D
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
' A3 e5 y P o; K+ R' t% R4 J5 _ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;! H2 P2 g+ C) ~ |
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
8 D- |. D( u2 C% h+ N# n GPIO_Init(GPIOA, &GPIO_InitStructure); ' K, F; ~4 Y& e2 x' y
//USART1_RX PA.10
- R+ q) ~; ~& d- i" q) Z GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
' r. X7 G% A/ y GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOAtiNG;//浮空输入
1 {+ ~; ?7 ?+ K* _, @ GPIO_Init(GPIOA, &GPIO_InitStructure);
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+ e& w8 |$ R6 E u: `3 t5 P* W( n- j //USART 初始化设置; p4 v+ o4 n' Y/ W$ [/ i
USART_InitStructure.USART_BaudRate = bound;//一般设置为9600;8 F7 s( n) m; p
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
8 R* E( |) b# R3 N1 R/ t0 X USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
1 U. ? G7 {$ q+ A" p USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位( X9 @4 Q4 C" O- |3 D% ~
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制* D! \. w: p/ J) Q& x3 M% \
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
, ?% a$ z% x+ A% f( [3 g* ` USART_Init(USART1, &USART_InitStructure); //初始化串口7 ~/ ^$ s5 v2 n! M! c% r
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启ENABLE/关闭DISABLE中断
0 }( J- f% s1 B& {! G" V4 C USART_Cmd(USART1, ENABLE); //使能串口
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8 i1 `1 ^- z, Qu8 rx_buffer[20];1 w5 o8 Q0 j, l; y- C
u8 flag=0;* ?/ `- l! ]( Q8 U3 L( U0 [
u8 i=0;- s6 s) y# V6 j8 O r
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& t7 Q9 W) t+ j w/ evoid USART1_IRQHandler(void){ //串口1中断服务程序(固定的函数名不能修改)
6 H# t ]* g5 s u8 res;
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if(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET)* ]5 {, z4 ]0 W* V: X! U
{
3 i/ J2 T @$ Q res = USART_ReceiveData(USART1); 4 [; Y/ ?% C- U/ ]
if(flag != 4)
: X0 ?1 z1 z7 ]4 z8 S9 M( } {
* A. g- f! Z1 H6 v# a2 l% P% G rx_buffer[i++] = res;
4 L( e6 }6 m) P( F% u. x flag ++;
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}
# r1 F( v5 Q5 U1 j3 }' `; ] USART_ClearITPendingBit(USART1,USART_IT_RXNE);//清除串口3的串口接收中断标志位- l- J$ Y( B' T6 ]7 E# W& d9 K
}
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! w1 n" |: X9 R0 T: F- j( ~main.c
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#include "STM32f10x.h" //STM32头文件
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#include "delay.h"/ O1 h: `7 m' u- ]9 V$ W2 Z8 _0 i
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#include "usart.h"3 U5 a- K' P) [9 ^$ [: q3 H9 k
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extern u8 rx_buffer[];7 X. X4 w+ U- |3 t9 X/ M# i
int main (void){//主程序
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u32 dis=0;
% }% U7 x V& U% L //初始化程序- g3 q7 H5 y; H* i. T/ t+ t& M
RCC_Configuration(); //时钟设置! [; |! m6 ]; D0 J
4 F+ o+ ^# J8 F- a USART1_Init(9600); //串口初始化(参数是波特率)
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//主循环
5 t1 {2 R0 C+ l4 Y9 L while(1){
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$ S R! y0 s- t4 w/ c5 dsum = (rx_buffer[0] + rx_buffer[1] + rx_buffer[2]) & 0x00FF; //A02校验和,前三项加和的低8位
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0 e6 |$ Y' [6 L6 T# u if((rx_buffer[0] == 0xFF)&&(rx_buffer[3] == sum)) //帧头0XFF,帧尾校验和
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' @) M( q6 b" q& y! N5 Y1 D dis = (rx_buffer[1] << 8) + rx_buffer[2]; //数据高八位和低八位# T4 n: q' q6 G" ?* ?' i$ ?( \) N5 Z
}
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