Posted on July 31, 2015 at 08:40Hello, everyone! I'm use usart to receive packets with different size. I'm use next code to do this. Also it's fine, but i going inside ISR twice. And it's trouble for me. Please, anyone get help me, that i'm doing wrong?
void usart3_config(void){
GPIO_InitTypeDef gpio_init;
USART_InitTypeDef usart_init;
NVIC_InitTypeDef NVIC_usart3;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
gpio_init.GPIO_Mode = GPIO_Mode_AF;
gpio_init.GPIO_Pin = GPIO_Pin_11;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Speed = GPIO_Speed_40MHz;
//gpio_init.GPIO_OType = GPIO_OType_PP;
GPIO_Init( GPIOC, &gpio_init);
gpio_init.GPIO_Mode = GPIO_Mode_AF;
gpio_init.GPIO_Pin = GPIO_Pin_10;
gpio_init.GPIO_PuPd = GPIO_PuPd_UP;
gpio_init.GPIO_Speed = GPIO_Speed_40MHz;
gpio_init.GPIO_OType = GPIO_OType_PP;
GPIO_Init( GPIOC, &gpio_init);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);
usart_init.USART_BaudRate = 9600;
usart_init.USART_HardwareFlowControl =USART_HardwareFlowControl_None;
usart_init.USART_Mode = USART_Mode_Rx|USART_Mode_Tx;
usart_init.USART_Parity= USART_Parity_No;
usart_init.USART_StopBits = USART_StopBits_1;
usart_init.USART_WordLength = USART_WordLength_8b;
USART_Init ( USART3, &usart_init);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
USART_Cmd(USART3, ENABLE);
NVIC_usart3.NVIC_IRQChannel = USART3_IRQn;
NVIC_usart3.NVIC_IRQChannelCmd = ENABLE;
NVIC_usart3.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_usart3.NVIC_IRQChannelSubPriority = 1;
NVIC_Init(&NVIC_usart3);
}
void getHC(void)
{
uint16_t stop = 0, i = 0;
uint16_t count = 0;
while(!stop)
{
if(!CheckHCBuffer()){stop=1; }
else {if (count <= HCBUFFERSIZE)
HCBuffer[count]= USART_ReceiveData(USART3);
count++;
}
//USART_ClearITPendingBit(USART3, USART_IT_RXNE);
}
}
}
char CheckHCBuffer(void)
{
long i=0,j=0;
while(!USART_GetFlagStatus(USART3, USART_FLAG_RXNE)&&(i<1800))//
{
i++;}
return USART_GetFlagStatus(USART3, USART_FLAG_RXNE);
}
#isr #usart #stm32l
