STM32F103C8 USART通訊Rx收資料未能百分之百收到正確的資料長度

[宗榕江]

想請問有沒有人使用STM32F1系列遇過USART Rx收資料，資料長度會有幾次沒能達到送出的資料數，我protocal定義是收7筆長度資料，發現我用PC端每幾秒送一次，確實每次都會進USART_Handler，但會有幾次未能收到正確7筆的資料，

之前使用別家MCU都沒遇過這問題，我需要百分之百收到正確資料，以下是我USART初始化及USART_Handler的code，是哪裡有寫錯嗎，求解!!

USART初始化:

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure; 

USART_ClockInitTypeDef  USART_InitClockStruct;

/* config USART1 clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA ,ENABLE);

/* USART1 GPIO config */

/* Configure USART1 Tx (PA.09) as alternate function push-pull */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);    

/* Configure USART1 Rx (PA.10) as input floating */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);

 

/* USART1 mode config */

USART_InitStructure.USART_BaudRate = 921600;

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_Rx | USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure); 

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //enable rx interrupt

USART_Cmd(USART1, ENABLE); 

/* Configure the NVIC Preemption Priority Bits */  

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

/* Enable the USARTy Interrupt */

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//1;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

USART Handler:

void USART1_IRQHandler(void)

{

if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)

     {

RX_Buffer[RX_cnt++]=USART_ReceiveData(USART1);//USART1->DR;  

}  

}

[Bee]

速度太快，中斷未退出，下一個資料就進來，於是掉了。
建議使用DMA收，硬體收，保證不掉。
我在使用1.5Mb 鮑率時遇到此問題，DMA就解決了。