Uart Receive is not working

[yoyogesh01]

Posted on October 29, 2015 at 10:00

I am new to STM

I have written following code in iar but couldn't able to receive from uart.

//
// This program shows how you can output a message on the UART on
// the STM8S microcontroller.
//
// This software is provided under the CC BY-SA 3.0 licence. A
// copy of this licence can be found at:
//
// http://creativecommons.org/licenses/by-sa/3.0/legalcode
//
#if defined DISCOVERY
#include <iostm8S105c6.h>
#elif defined PROTOMODULE
#include <iostm8s103k3.h>
#else
#include <iostm8s003f3.h>
#endif
#include <intrinsics.h>
#include <stdio.h>
//
// Setup the system clock to run at 16MHz using the internal oscillator.
//
void
InitialiseSystemClock()
{
CLK_ICKR = 0; 
// Reset the Internal Clock Register.
CLK_ICKR_HSIEN = 1; 
// Enable the HSI.
CLK_ECKR = 0; 
// Disable the external clock.
while
(CLK_ICKR_HSIRDY == 0); 
// Wait for the HSI to be ready for use.
CLK_CKDIVR = 0; 
// Ensure the clocks are running at full speed.
CLK_PCKENR1 = 0xff; 
// Enable all peripheral clocks.
CLK_PCKENR2 = 0xff; 
// Ditto.
CLK_CCOR = 0; 
// Turn off CCO.
CLK_HSITRIMR = 0; 
// Turn off any HSIU trimming.
CLK_SWIMCCR = 0; 
// Set SWIM to run at clock / 2.
CLK_SWR = 0xe1; 
// Use HSI as the clock source.
CLK_SWCR = 0; 
// Reset the clock switch control register.
CLK_SWCR_SWEN = 1; 
// Enable switching.
while
(CLK_SWCR_SWBSY != 0); 
// Pause while the clock switch is busy.
}
//
// Setup the UART to run at 115200 baud, no parity, one stop bit, 8 data bits.
//
// Important: This relies upon the systemk clock being set to run at 16 MHz.
//
void
InitialiseUART()
{
//
// Clear the Idle Line Detected bit in the status rerister by a read
// to the UART1_SR register followed by a Read to the UART1_DR register.
//
unsigned 
char
tmp = UART1_SR;
tmp = UART1_DR;
//
// Reset the UART registers to the reset values.
//
UART1_CR1 = 0;
UART1_CR2 = 0;
UART1_CR4 = 0;
UART1_CR3 = 0;
UART1_CR5 = 0;
UART1_GTR = 0;
UART1_PSCR = 0;
//
// Now setup the port to 115200,n,8,1.
//
UART1_CR1_M = 0; 
// 8 Data bits.
UART1_CR1_PCEN = 0; 
// Disable parity.
UART1_CR3_STOP = 0; 
// 1 stop bit.
// UART1_BRR2 = 0x0a; // Set the baud rate registers to 115200 baud
// UART1_BRR1 = 0x08; // based upon a 16 MHz system clock.
UART1_BRR2 = 0x02; 
// Set the baud rate registers to 9600 baud
UART1_BRR1 = 0x68; 
// based upon a 16 MHz system clock.
//
// Disable the transmitter and receiver.
//
UART1_CR2_TEN = 0; 
// Disable transmit.
UART1_CR2_REN = 0; 
// Disable receive.
//
// Set the clock polarity, lock phase and last bit clock pulse.
//
UART1_CR3_CPOL = 1;
UART1_CR3_CPHA = 1;
UART1_CR3_LBCL = 1;
//
// Turn on the UART transmit, receive and the UART clock.
//
UART1_CR2_TEN = 1;
UART1_CR2_REN = 1;
UART1_CR3_CKEN = 1;
}
//
// Send the message in the string to UART1.
//
void
UARTPrintF(
char
*message)
{
char
*ch = message;
while
(*ch)
{
UART1_DR = (unsigned 
char
) *ch; 
// Put the next character into the data transmission register.
while
(UART1_SR_TXE == 0); 
// Wait for transmission to complete.
ch++; 
// Grab the next character.
}
}
unsigned 
char
RecUART1(
void
)
{
while
(!(UART1_SR_RXNE)); 
// USART_SR[5]:RXNE Read data register not empty
PD_ODR |= (1<<2); 
// 0: Data is not received, 1: Received data is ready to be read.
return
UART1_DR;
}
int
main( 
void
)
{
unsigned 
char
out;
char
dis[25];
// PD_DDR = (1<<5)|(1<<2);
//PD_CR1 |= (1<<2);
//*out ='l';
//in=out;
__disable_interrupt();
InitialiseSystemClock();
InitialiseUART();
__enable_interrupt();
while
(1)
{
// UARTPrintF(''Yogesh You Rock....\n\r'');
//for (long counter = 0; counter < 250000; counter++);
out = RecUART1();
//for (long counter = 0; counter < 250000; counter++);
sprintf
(dis,
''this is %c\n''
,out);
UARTPrintF(dis);
}
}

Please help me #stm8s003f3 #receive #stm8s #uart

[toppot2009]

Posted on November 02, 2015 at 18:00

Hi,

Try to see the oscilloscope on the RX and TX, both signals must be high state