char recv_string[10];
char data;
int count = -1,i,data_check = -1;
void USART3_IRQHandler(void) //my interrupt handler
{
if(USART_GetITStatus(USART3,USART_IT_TXE))
{
data = USART_GetChar();
if(data == 0x0D || data == 0x08)
data_check = 1;
else
data_check = 0;
}
USART_ClearITPendingBit(USART3,USART_IT_TXE);
}
void usart3_fun()
{
//structure initialise
USART_InitTypeDef my_usart_init;
GPIO_InitTypeDef my_gpio_init;
NVIC_InitTypeDef my_nvic_init;
//Enable clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
//GPIO Configurations
my_gpio_init.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
my_gpio_init.GPIO_Mode = GPIO_Mode_AF;
my_gpio_init.GPIO_OType = GPIO_OType_PP;
my_gpio_init.GPIO_PuPd = GPIO_PuPd_UP;
my_gpio_init.GPIO_Speed = GPIO_Speed_100MHz;
//USART Base Initialisation
my_usart_init.USART_BaudRate = 9600;
my_usart_init.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
my_usart_init.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
my_usart_init.USART_Parity = USART_Parity_No;
my_usart_init.USART_StopBits = USART_StopBits_1;
my_usart_init.USART_WordLength = USART_WordLength_8b;
//Enable Rx interrupt
USART_ITConfig(USART3,USART_IT_RXNE, ENABLE);
//NVIC Initialization
my_nvic_init.NVIC_IRQChannel = USART3_IRQn;
my_nvic_init.NVIC_IRQChannelCmd = ENABLE;
my_nvic_init.NVIC_IRQChannelPreemptionPriority = 0;
my_nvic_init.NVIC_IRQChannelSubPriority = 0;
//Init functions
GPIO_Init(GPIOB, &my_gpio_init);
USART_Init(USART3, &my_usart_init);
NVIC_Init(&my_nvic_init);
//Alternate Function
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_USART3);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART3);
//ENABLE Peripheral
USART_Cmd(USART3, ENABLE);
}
//void comman
void data_get()
{
usart3_fun(); //initializing USART3
while(1)
{
if(data_check == 1)
{
USART3_send_char('\n');
USART3_send_char('\r');
if(data == 0x08){
//Backspace
print_string();
for(i=0;i<=count;i++)
recv_string[i] = NULL; //executing this statement first in while(1)
count = -1; //executing this statement second in while(1)
}
else{
//checking command
//data_process(recv_string);
print_string(); //calls send character function in it.
for(i=0;i<=count;i++)
recv_string[i] = NULL;
count = -1;
}
USART3_send_char('\n');
USART3_send_char('\r');
data_check = -1;
}
else if (data_check == -1) //executing this statement third in while(1)
{
data_check = -1; //nothing waiting for input data
}
else
{
count++;
USART3_send_char(data); //STM32 send character function
recv_string[count] = data;
data_check = -1;
}
}
}
main()
{
/* SysTick end of count event each 10ms */
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 100);
data_get();//function in main
}
