Posted on October 05, 2015 at 13:24hi all,
ive written this sample code for receving data and storing in buffer
how do i stop receiving data when enter button is encountered
#include <stdio.h>
#include ''main.h''
static const char String1[] = ''ENTER THE OPERATION\r\n'';
static const char String2[] = ''YOUR OPERATION IS:'';
static const char String3[] = ''NUMBER 1 IS:'';
static const char String4[] = ''NUMBER 2 IS:'';
static const char ErrorString[]= '' YOUR CHOICE IS INCORRECT\r\n'';
void USART1Configuration(void);
void OutString(const char *s);
char GetChar(void);
void CALCULATOR(void);
void START(void);
void RECEIVE(void);
void TEMP(void);
int IN[100];
int i=0;
int main(void)
{
if (SysTick_Config(SystemCoreClock / 1000))
{
while(1);
}
STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_EXTI);
STM_EVAL_LEDInit(LED3);
STM_EVAL_LEDInit(LED4);
STM_EVAL_LEDInit(LED5);
STM_EVAL_LEDInit(LED6);
USART1Configuration();
while(1)
{
CALCULATOR();
}
}
void USART1Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
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_Cmd(USART1,ENABLE);
}
void OutString(const char *s)
{
while(*s) // Not NUL
{
if (USART_GetFlagStatus(USART1, USART_FLAG_TXE) != RESET) // if it's empty
USART_SendData(USART1, *s++); // Out char, and advance
}
}
void OutInt(const int *s)
{
while(*s) // Not NUL
{
if (USART_GetFlagStatus(USART1, USART_FLAG_TXE) != RESET) // if it's empty
USART_SendData(USART1, *s++); // Out char, and advance
}
}
char GetChar(void)
{
char ch;
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET); // wait while no data
ch = (char)USART_ReceiveData(USART1);
return(ch);
}
void CALCULATOR(void)
{
START();
RECEIVE();
TEMP();
}
void START (void)
{
OutString(String1);
}
void RECEIVE (void)
{
while(1)
{
IN[i++] = GetChar();
if ((IN[i]== '0x0d') || (IN[i]== '0x0d'))
return;
}
}
void TEMP (void)
{
OutString(String2);
OutInt(IN);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
