程序如下：
void bsp_RS485_IRQHandler(void)
{
if(USART_GetITStatus(RS485_usart, USART_IT_ORE)==SET)
{
USART_ClearITPendingBit(RS485_usart, USART_IT_ORE);
USART_ReceiveData(RS485_usart);
}
if(USART_GetITStatus(RS485_usart, USART_IT_RXNE) != RESET)
{
uart_buff[uart_p] = USART_ReceiveData(RS485_usart);
uart_p++;
｝
USART_ClearITPendingBit(RS485_usart, USART_IT_RXNE);
}
if(uart_p == 9)
{
recivestate = 1;
len = uart_p;
for(i = 0;i<uart_p;i++)//´«³öÊý¾Ý
{
uart_rx_buff[i] = uart_buff[i];
}
//clean_rebuff();
}
｝
void main（）
｛
RS485_init();
u16 sum=0;
void test()
{
u8 txbuff[1024];
u8 buff[2] = {0x01,0x02};
u16 i,cnt = 0;
if(recivestate == 1)
{
recivestate = 0;
for(i=1;i<len-4;i++)
{
sum += uart_rx_buff[i];
}
if(uart_rx_buff[cnt] == title1_send && uart_rx_buff[cnt+1] == title2_send)
{
if(uart_rx_buff[cnt+5] == (sum&0xff) && uart_rx_buff[cnt+6] == ((sum>>8)&0xff))
{
switch(uart_rx_buff[cnt+2])
{
case 0x08: //選擇功能
RS485_TX_EN();
RESEND(0x08,len);
//RS485_delay(10000);
RS485_RX_EN();
break;
｝
｝
｝
void RESEND(u8 cmd,u8 L)
{
u8 data_send[50];
u8 cnt = 0;
u16 i ,sum;
data_send[cnt++] = title1_send;
data_send[cnt++] = title2_send;
data_send[cnt++] = cmd;
data_send[cnt++] = L;
for(i=1;i<L-4;i++)
{
sum += data_send[i];
}
data_send[cnt++] = (sum&0xff);
data_send[cnt++] = ((sum>>8)&0xff);
data_send[cnt++] = 0X0D;
data_send[cnt++] = 0X0A;
USART_send_array(RS485_usart,data_send,cnt-1);
}
void USART_send_array(USART_TypeDef *pUSARTx,u8 *array,u8 len)
{
u8 i=0;
while(i<len)
{
USART_SendData(pUSARTx,array[i]);
while( USART_GetFlagStatus(pUSARTx,USART_FLAG_TC)!= SET);
i++;
}
}
｝
配置文件
void RS485_configure()
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RS485_usart_clk,ENABLE);
RCC_APB2PeriphClockCmd(RS485_USART_RX_GPIO_CLK,ENABLE);
RCC_APB2PeriphClockCmd(RS485_USART_TX_GPIO_CLK,ENABLE);
RCC_APB2PeriphClockCmd(RS485_USART_PE_GPIO_CLK,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_InitStructure.GPIO_Pin=RS485_usart_TX_PIN;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(RS485_USART_TX_GPIO_PORT,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=RS485_usart_RX_pin;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(RS485_USART_RX_GPIO_PORT,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=RS485_RE_PIN;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(RS485_RE_GPIO_PORT,&GPIO_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = RS485_INT_IRQ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(RS485_usart, USART_IT_RXNE, ENABLE);
USART_ITConfig(RS485_usart, USART_IT_IDLE, ENABLE);
USART_ITConfig(RS485_usart, USART_IT_ORE, ENABLE);
GPIO_ResetBits(RS485_RE_GPIO_PORT,RS485_RE_PIN);
}
中斷里接收到的數(shù)據(jù)是完整的，比如接收到了3A 16 08 01 00 .... 0D 0A,我想mcu返回3A 16 09 02.....,全速運行后結(jié)果只返回了一個3A，然后程序卡住了，之后再怎么發(fā)都不返回了，停下來就發(fā)現(xiàn)一直在中斷里面。我查了下數(shù)據(jù)，數(shù)據(jù)也有傳到uart_rx_buff[]里面了。求各位大神幫幫忙!!!!!!(還有一點，我按照網(wǎng)上的說法在發(fā)送后面加了個延時函數(shù)，就發(fā)送了3A 16，之后無論怎么加大延時函數(shù)也是發(fā)這兩個。)
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