Posted on April 06, 2014 at 03:23I'm using a STM32F3 Discovery and connecting it to labVIEW the problem is that I can't receive more than one byte. Can someone help me modifying my code to allow multiple byte reception. I'm testing it sending something and reading it in labVIEW. A problem occurs when I send more than 1 byte.
//-----------------------------------------------------Register comment format-----------------------------------------------------//
//[ Register bits ] Function name[ Function bits ] -> Value Effect explanation
//---------------------------------------------------------------------------------------------------------------------------------//
&sharpinclude <stm32f30x.h>
&sharpinclude <stdio.h>
&sharpinclude <math.h>
&sharpinclude ''lib/delay.h''
void charTX ( char ch );
void stringTX ( char *string );
uint8_t GetChar ( void );
char letra;
int main ( void )
{
char output[4];
delayinit();
//-----------------------------------------------------PC4 Configuration------------------------------------------------------//
RCC->AHBENR |= RCC_AHBENR_GPIOCEN; // [ 19 ] IOPCEN = 1 I/O port A clock enabled.
GPIOC->MODER |= 2 << ( 4*2 ); // [ 9:8 ] MODER4[ 1:0 ] = 10b Alternate function on
// PIN C4
//GPIOC->OTYPER |= 1 << ( 4*1 ); // [ 4 ] OT4 = 1 Output as open drain
GPIOC->OSPEEDR |= 3 << ( 4*2 ); // [ 9:8 ] OSPEEDR4[ 1:0 ] = 11b 50 MHz High-speed on PIN C4
//GPIOC->PUPDR &= ~( 3 << ( 4*2 ) ); // [ 9:8 ] PUPDR4[ 1:0 ] = 0 No pull-up/down om PIN C4
GPIOC->AFR[ 0 ] |= 7 << ( 4*4 ); // [ 17:16 ] AFRL4[ 3:0 ] = 0111b AF7( USART1_TX ) on PIN C4
// PC5 configuration (RX)
GPIOC->MODER |= 2 << (5*2); // GPIO_Mode_AF
GPIOC->AFR[0] |= 7 << (5*4); // AF7
RCC->APB2ENR |= RCC_APB2ENR_USART1EN; // Enable USART1 clock
USART1->BRR = 72000000/9600;
USART1->CR1 &= ~USART_CR1_OVER8; // Oversampling mode = 16
USART1->CR1 &= ~USART_CR1_M; // Word length = 8 bits
USART1->CR1 &= ~USART_CR1_PCE; // No parity
USART1->CR1 |= USART_CR1_TE; // Transmitter enable
USART1->CR1 |= USART_CR1_RE; // Receiver enable
USART1->CR1 |= USART_CR1_UE; // USART enable
USART1->CR2 &= ~(USART_CR2_STOP_1 | USART_CR2_STOP_0); // one stop bit
for( ;; )
{
letra = GetChar()
sprintf(output,''%4d\n'',letra);
stringTX(output);
delaybyms(10);
}
}
void charTX ( char ch )
{
while (!(USART1->ISR & USART_ISR_TXE));
USART1->TDR = (ch & 0xFF);
}
void stringTX ( char *string )
{
do
{
charTX( *string );
*string++;
}while(*string);
}
uint8_t GetChar ( void )
{
while (!(USART1->ISR & USART_ISR_RXNE));
return ((uint8_t)(USART1->RDR & 0xFF));
}
#usart-stm32f3
