新手求助，MINI3开发板如何完成串口输入并在lcd上显示。

就是不吃草的羊 · 发表于 2018-7-10 16:29:46

主要问题如题所示

外接串口是一个测距模块，串口数据格式（协议）为：ma 0e 00000000 0000026f 00000258 000002d2 1050 bf 00032603 a0:0
mc 07 0000081f 000006f8 00000727 00000000 1053 b8 0003262f a0:0
mr 07 0000076b 0000063a 00000669 00000000 1053 b8 40224022 a0:0

想编写一个代码，将其输出并在LCD屏上显示。

利用了增值资料里，北斗模块的串口2代码。 1.设置输入为PA.3 输出 PA.2（在这里也用不到）
                                                            2.设置DMA模式传输
                                                            3.判断是否结束一组数据用的是 10ms 判断方法其实上述就是北斗那个串口2的代码没有什么变动
                                                            4.主函数除了初始化，while（1）打印一行字什么别的也没干
                                                            5.为了方便看    每次往数据寄存器里写数据的时候都在LCD上显示

在最后附上代码

遇见的问题是（运行结果）

个人分析：    串口肯定接收到了数据触发中断，  我想象中的结果是 lcd上飞快闪动接收数据寄存器的值但只显示了一个字母p（什么鬼？）

                  求助一种方法或者有类似这种带格式的数据输入处理的例程  （我也写过最简单的串口2DMA输入然后在lcd显示（u32）dma rec buf的值，每次都是空白，usart2->dr 在lcd显示也是空白，是lcd不能用showstring显示他们，还是他们根本就没有输入？如果没有为什么会产生中断？头大）

                  为了实现这个功能已经各种方式尝试了接近一周，基础不是很好，另外上述只是最后一种尝试的方式。deadline 在即，真心希望得到各位大佬的帮助！

就是不吃草的羊 · 发表于 2018-7-10 16:31:28

_align(8) u8 USART2_TX_BUF[USART2_MAX_SEND_LEN]; //·¢ËÍ»º³å,×î´óUSART2_MAX_SEND_LEN×Ö½Ú
#ifdef USART2_RX_EN    //Èç¹ûÊ¹ÄÜÁË½ÓÊÕ
//´®¿Ú½ÓÊÕ»º´æÇø
u8 USART2_RX_BUF[USART2_MAX_RECV_LEN]; //½ÓÊÕ»º³å,×î´óUSART2_MAX_RECV_LEN¸ö×Ö½Ú.

//Í¨¹ýÅÐ¶Ï½ÓÊÕÁ¬Ðø2¸ö×Ö·ûÖ®¼äµÄÊ±¼ä²î²»´óÓÚ10msÀ´¾ö¶¨ÊÇ²»ÊÇÒ»´ÎÁ¬ÐøµÄÊý¾Ý.
//Èç¹û2¸ö×Ö·û½ÓÊÕ¼ä¸ô³¬¹ý10ms,ÔòÈÏÎª²»ÊÇ1´ÎÁ¬ÐøÊý¾Ý.Ò²¾ÍÊÇ³¬¹ý10msÃ»ÓÐ½ÓÊÕµ½
//ÈÎºÎÊý¾Ý,Ôò±íÊ¾´Ë´Î½ÓÊÕÍê±Ï.
//½ÓÊÕµ½µÄÊý¾Ý×´Ì¬
//[15]:0,Ã»ÓÐ½ÓÊÕµ½Êý¾Ý;1,½ÓÊÕµ½ÁËÒ»ÅúÊý¾Ý.
//[14:0]:½ÓÊÕµ½µÄÊý¾Ý³¤¶È
u16 USART2_RX_STA=0;
void USART2_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)//½ÓÊÕµ½Êý¾Ý
{    LCD_ShowString(30,40,209,119,16,"Range_deca[0]");

res =USART_ReceiveData(USART2);
if(USART2_RX_STA<USART2_MAX_RECV_LEN) //»¹¿ÉÒÔ½ÓÊÕÊý¾Ý
{
TIM_SetCounter(TIM4,0);//¼ÆÊýÆ÷Çå¿Õ
if(USART2_RX_STA==0)TIM4_Set(1);      //Ê¹ÄÜ¶¨Ê±Æ÷4µÄÖÐ¶Ï
USART2_RX_BUF[USART2_RX_STA++]=res; //¼ÇÂ¼½ÓÊÕµ½µÄÖµ
LCD_ShowString(30,60,209,119,16,res);
LCD_ShowString(30,80,209,119,16,"Range_deca[0]");


}else
{
USART2_RX_STA|=1<<15; //Ç¿ÖÆ±ê¼Ç½ÓÊÕÍê³É
LCD_ShowString(30,100,209,119,16,"Range_deca[0]");
}
}
}
//³õÊ¼»¯IO ´®¿Ú2
//pclk1

CLK1Ê±ÖÓÆµÂÊ(Mhz)
//bound:²¨ÌØÂÊ
void USART2_Init(u32 bound)
{

NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // GPIOAÊ±ÖÓ
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

USART_DeInit(USART2);  //¸´Î»´®¿Ú2
   //USART2_TX PA.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»&macr

A2

//USART2_RX    PA.3
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë
  GPIO_Init(GPIOA, &GPIO_InitStructure);  //³õÊ¼»&macr

A3

USART_InitStructure.USART_BaudRate = bound;//Ò»°ãÉèÖÃÎª9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8Î»Êý¾Ý¸ñÊ½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæÅ¼Ð£ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½

USART_Init(USART2, &USART_InitStructure); //³õÊ¼»¯´®¿Ú 2

//²¨ÌØÂÊÉèÖÃ
// USART2->BRR=(pclk1*1000000)/(bound);// ²¨ÌØÂÊÉèÖÃ
//USART2->CR1|=0X200C;    //1Î»Í£Ö¹,ÎÞÐ£ÑéÎ».
USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);    //Ê¹ÄÜ´®¿Ú2µÄDMA·¢ËÍ
UART_DMA_Config(DMA1_Channel7,(u32)&USART2->DR,(u32)USART2_TX_BUF);//DMA1Í¨µÀ7,ÍâÉèÎª´®¿Ú2,´æ´¢Æ÷ÎªUSART2_TX_BUF
USART_Cmd(USART2, ENABLE);                   //Ê¹ÄÜ´®¿Ú

#ifdef USART2_RX_EN       //Èç¹ûÊ¹ÄÜÁË½ÓÊÕ
//Ê¹ÄÜ½ÓÊÕÖÐ¶Ï
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿ªÆôÖÐ¶Ï

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;//ÇÀÕ¼ÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×ÓÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀÊ¹ÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷
TIM4_Init(999,7199); //10msÖÐ¶Ï
USART2_RX_STA=0; //ÇåÁã
TIM4_Set(0); //¹Ø±Õ¶¨Ê±Æ÷4
#endif

}
//´®¿Ú2,printf º¯Êý
//È·±£Ò»´Î·¢ËÍÊý¾Ý²»³¬¹ýUSART2_MAX_SEND_LEN×Ö½Ú
void u2_printf(char* fmt,...)
{
va_list ap;
va_start(ap,fmt);
vsprintf((char*)USART2_TX_BUF,fmt,ap);
va_end(ap);
while(DMA_GetCurrDataCounter(DMA1_Channel7)!=0); //µÈ´ýÍ¨µÀ7´«ÊäÍê³É
UART_DMA_Enable(DMA1_Channel7,strlen((const char*)USART2_TX_BUF)); //Í¨¹ýdma·¢ËÍ³öÈ¥
}
//¶¨Ê±Æ÷4ÖÐ¶Ï·þÎñ³ÌÐò
void TIM4_IRQHandler(void)
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)//ÊÇ¸üÐÂÖÐ¶Ï
{
USART2_RX_STA|=1<<15; //±ê¼Ç½ÓÊÕÍê³É
TIM_ClearITPendingBit(TIM4, TIM_IT_Update  );  //Çå³ýTIMx¸üÐÂÖÐ¶Ï±êÖ¾
TIM4_Set(0); //¹Ø±ÕTIM4
}
}
//ÉèÖÃTIM4µÄ¿ª¹Ø
//sta:0£¬¹Ø±Õ;1,¿ªÆô;
void TIM4_Set(u8 sta)
{
if(sta)
{

TIM_SetCounter(TIM4,0);//¼ÆÊýÆ÷Çå¿Õ
TIM_Cmd(TIM4, ENABLE);  //Ê¹ÄÜTIMx
}else TIM_Cmd(TIM4, DISABLE);//¹Ø±Õ¶¨Ê±Æ÷4
}
//Í¨ÓÃ¶¨Ê±Æ÷ÖÐ¶Ï³õÊ¼»¯
//ÕâÀïÊ¼ÖÕÑ¡ÔñÎªAPB1µÄ2±¶£¬¶øAPB1Îª36M
//arr£º×Ô¶¯ÖØ×°Öµ¡£
//psc£ºÊ±ÖÓÔ¤·ÖÆµÊý
void TIM4_Init(u16 arr,u16 psc)
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //Ê±ÖÓÊ¹ÄÜ//TIM4Ê±ÖÓÊ¹ÄÜ

//¶¨Ê±Æ÷TIM3³õÊ¼»¯
TIM_TimeBaseStructure.TIM_Period = arr; //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂÊÂ¼þ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔØ¼Ä´æÆ÷ÖÜÆÚµÄÖµ
TIM_TimeBaseStructure.TIM_Prescaler =psc; //ÉèÖÃÓÃÀ´×÷ÎªTIMxÊ±ÖÓÆµÂÊ³ýÊýµÄÔ¤·ÖÆµÖµ
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //ÉèÖÃÊ±ÖÓ·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯TIMxµÄÊ±¼ä»ùÊýµ¥Î»

TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE ); //Ê¹ÄÜÖ¸¶¨µÄTIM4ÖÐ¶Ï,ÔÊÐí¸üÐÂÖÐ¶Ï


NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//ÇÀÕ¼ÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //×ÓÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀÊ¹ÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷

}
#endif
///////////////////////////////////////USART2 DMA·¢ËÍÅäÖÃ²¿·Ö//////////////////////////////////
//DMA1µÄ¸÷Í¨µÀÅäÖÃ
//ÕâÀïµÄ´«ÊäÐÎÊ½ÊÇ¹Ì¶¨µÄ,ÕâµãÒª¸ù¾Ý²»Í¬µÄÇé¿öÀ´ÐÞ¸Ä
//´Ó´æ´¢Æ÷->ÍâÉèÄ£Ê½/8Î»Êý¾Ý¿í¶È/´æ´¢Æ÷ÔöÁ¿Ä£Ê½
//DMA_CHx

MAÍ¨µÀCHx
//cpar:ÍâÉèµØÖ·
//cmar:´æ´¢Æ÷µØÖ·
void UART_DMA_Config(DMA_Channel_TypeDef*DMA_CHx,u32 cpar,u32 cmar)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //Ê¹ÄÜDMA´«Êä
  DMA_DeInit(DMA_CHx); //½«DMAµÄÍ¨µÀ1¼Ä´æÆ÷ÖØÉèÎªÈ±Ê¡Öµ
DMA_InitStructure.DMA_PeripheralBaseAddr = cpar;  //DMAÍâÉèADC»ùµØÖ·
DMA_InitStructure.DMA_MemoryBaseAddr = cmar;  //DMAÄÚ´æ»ùµØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;  //Êý¾Ý´«Êä·½Ïò£¬´ÓÄÚ´æ¶ÁÈ¡·¢ËÍµ½ÍâÉè
DMA_InitStructure.DMA_BufferSize = 0;  //DMAÍ¨µÀµÄDMA»º´æµÄ´óÐ¡
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  //ÍâÉèµØÖ·¼Ä´æÆ÷²»±ä
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  //ÄÚ´æµØÖ·¼Ä´æÆ÷µÝÔö
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  //Êý¾Ý¿í¶ÈÎª8Î»
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //Êý¾Ý¿í¶ÈÎª8Î»
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;  //¹¤×÷ÔÚÕý³£»º´æÄ£Ê½
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMAÍ¨µÀ xÓµÓÐÖÐÓÅÏÈ¼¶
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  //DMAÍ¨µÀxÃ»ÓÐÉèÖÃÎªÄÚ´æµ½ÄÚ´æ´«Êä
DMA_Init(DMA_CHx, &DMA_InitStructure);  //¸ù¾ÝDMA_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯DMAµÄÍ¨µÀUSART1_Tx_DMA_ChannelËù±êÊ¶µÄ¼Ä´æÆ÷
}
//¿ªÆôÒ»´ÎDMA´«Êä
void UART_DMA_Enable(DMA_Channel_TypeDef*DMA_CHx,u8 len)
{
DMA_Cmd(DMA_CHx, DISABLE );  //¹Ø±Õ Ö¸Ê¾µÄÍ¨µÀ
DMA_SetCurrDataCounter(DMA_CHx,len);//DMAÍ¨µÀµÄDMA»º´æµÄ´óÐ¡
DMA_Cmd(DMA_CHx, ENABLE);          //¿ªÆôDMA´«Êä
}

正点原子 · 发表于 2018-7-11 02:37:38

仿真找问题哦

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新手求助，MINI3开发板如何完成串口输入并在lcd上显示。

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