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STM32F103ZET6 默认板载的CH340 串口1 下载程序。 现在想用串口2 收发数据，在调试的过程中出现问题（用外部的USB转串口线TX RX GND连接到STM32F103ZET的RX TX GND）
如下完全按照正点原子串口1 配置改成串口2 的 ：
#include "sys.h"
#include "usart.h"
//////////////////////////////////////////////////////////////////////////////////
//èç1ûê1óÃucos,Ôò°üà¨ÏÂÃæμÄí·Îļt¼′¿é.
#if SYSTEM_SUPPORT_OS
#include "includes.h" //ucos ê1óÃ
#endif
//////////////////////////////////////////////////////////////////
//¼óèëòÔÏÂ′úÂë,Ö§3Öprintfoˉêy,¶ø2»DèòaÑ¡Ôñuse MicroLIB
#if 1
#pragma import(__use_no_semihosting)
//±ê×¼¿aDèòaμÄÖ§3Öoˉêy
struct __FILE
{
int handle;
};
FILE __stdout;
//¶¨òå_sys_exit()òÔ±üÃaê1óðëÖ÷»úÄ￡ê½
_sys_exit(int x)
{
x = x;
}
//Öض¨òåfputcoˉêy
int fputc(int ch, FILE *f)
{
while((USART2->SR&0X40)==0);//Ñ-»··￠Ëí,Ö±μ½·￠Ëííê±Ï
USART2->DR = (u8) ch;
return ch;
}
#endif
/*ê1óÃmicroLibμÄ·½·¨*/
/*
int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (uint8_t) ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}
return ch;
}
int GetKey (void) {
while (!(USART1->SR & USART_FLAG_RXNE));
return ((int)(USART1->DR & 0x1FF));
}
*/
#if EN_USART2_RX //èç1ûê1Äüá˽óêÕ
//′®¿ú1ÖD¶Ï·tÎñ3ìDò
//×￠òa,¶áè¡USARTx->SRÄü±üÃaÄaÃûÆäÃîμÄ′íÎó
u8 USART_RX_BUF[USART_REC_LEN]; //½óêÕ»o3å,×î′óUSART_REC_LEN¸ö×Ö½ú.
//½óêÕ×′ì¬
//bit15￡¬ ½óêÕíê3é±êÖ¾
//bit14￡¬ ½óêÕμ½0x0d
//bit13~0￡¬ ½óêÕμ½μÄóDD§×Ö½úêyÄ¿
u16 USART_RX_STA=0; //½óêÕ×′쬱ê¼Ç
void uart_init(u32 bound){
//GPIO¶Ë¿úéèÖÃ
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //ê1ÄüUSART2￡¬GPIOAê±Öó
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//USART2_TX GPIOA.2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.2
//USART2_RX GPIOA.33õê¼»ˉ
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.3
//Usart1 NVIC ÅäÖÃ
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏ輶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×óóÅÏ輶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷
//USART 3õê¼»ˉéèÖÃ
USART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂê
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8λêy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λ
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæżD￡Ñéλ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·￠Ä￡ê½
USART_Init(USART2, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
USART_Cmd(USART2, ENABLE); //ê1Äü′®¿ú1
}
void USART2_IRQHandler(void) //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(USART2); //¶á衽óêÕμ½μÄêy¾Y
if((USART_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½óêÕ′íÎó,ÖØD¿aê¼
else USART_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1ûêÕμ½0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//½óêÕêy¾Y′íÎó,ÖØD¿aê¼½óêÕ
}
}
}
}
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();
#endif
}
#endif
主函数：
#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "usart.h"
int main(void)
{
u16 t;
u16 len;
u16 times=0;
delay_init(); //Ñóê±oˉêy3õê¼»ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //éèÖÃNVICÖD¶Ï·Ö×é2:2λÇàÕ¼óÅÏ輶￡¬2λÏìó|óÅÏ輶
uart_init(115200); //′®¿ú3õê¼»ˉÎa115200
LED_Init(); //LED¶Ë¿ú3õê¼»ˉ
while(1)
{
if(USART_RX_STA&0x8000)
{
len=USART_RX_STA&0x3fff;//μÃμ½′Ë′νóêÕμ½μÄêy¾Y3¤¶è
printf("\r\nÄú·￠ËíμÄÏûÏ￠Îa:\r\n\r\n");
for(t=0;t<len;t++)
{
USART_SendData(USART2, USART_RX_BUF[t]);//Ïò′®¿ú1·￠Ëíêy¾Y
while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);//μè′y·￠Ëí½áêø
}
printf("\r\n\r\n");//2åèë»»DD
USART_RX_STA=0;
}else
{
times++;
if(times%5000==0)
{
printf("\r\nÕ½½￠STM32¿a·￠°å ′®¿úêμÑé\r\n");
printf("ÕyμãÔ-×ó@ALIENTEK\r\n\r\n");
}
if(times%200==0)printf("Çëêäèëêy¾Y,òÔ»Ø3μ¼ü½áêø\n");
if(times%30==0)LED0=!LED0;//éá˸LED,ìáê¾Ïμí3ÕyÔúÔËDD.
delay_ms(10);
}
}
}
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![_I1P7`4BJLI0ALZDL]%UL@L.png](data/attachment/forum/201609/12/091530q985kykszoqs2kqu.png "_I1P7`4BJLI0ALZDL]%UL@L.png")
最佳答案
查看完整内容[请看2#楼]
刚刚用外部CH340搭了个回路，正常了 。 之前一直调不通用的是 USB转串口线 （其内部用的是HL340）， 不知道HL340和CH340G 有什么区别 。 总之CH340G 能够正常通讯
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发表于 2016-9-12 09:17:31
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