I am trying to set up UART on a STM8L controller, and I have a code which works only on PC3. But I want to transmit on PA2, but I don't know why is it not working like this. I don't even initialize the PC3 pin. Is there anything I am missing or is there any way to define pins? I am working in IAR.
full code:
#include <iostm8l151k6.h>
#include <intrinsics.h>
#include <stdio.h>
void InitialiseSystemClock()
{
CLK_ICKCR = 0; // Reset the Internal Clock Register.
CLK_ICKCR_HSION = 1; // Enable the HSI.
CLK_ECKR = 0; // Disable the external clock.
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_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 isbusy.
}
void InitialiseUART()
{
unsigned char tmp = USART1_SR;
tmp = USART1_DR;
USART1_CR1 = 0;
USART1_CR2 = 0;
USART1_CR4 = 0;
USART1_CR3 = 0;
USART1_CR5 = 0;
USART1_GTR = 0;
USART1_PSCR = 0;
USART1_CR1_M = 0; // 8 Data bits.
USART1_CR1_PCEN = 0; // Disable parity.
USART1_CR3_STOP0 = 0; // 1 stop bit.
USART1_BRR2 = 0x0a; // Set the baud rate registers to 115200 baud
USART1_BRR1 = 0x08; // based upon a 16 MHz system clock.
USART1_CR2_TEN = 0; // Disable transmit.
USART1_CR2_REN = 0; // Disable receive.
USART1_CR3_CPOL = 1;
USART1_CR3_CPHA = 1;
USART1_CR3_LBCL = 1;
USART1_CR2_TEN = 1;
USART1_CR2_REN = 1;
USART1_CR3_CLKEN = 1;
}
void UARTPrintF(char *message)
{
char *ch = message;
while (*ch)
{
USART1_DR = (unsigned char) *ch; // Put the next character into the data transmission register.
while (USART1_SR_TXE == 0); // Wait for transmission to complete.
ch++; // Grab the next character.
}
}
void delay(long n)
{
while (n-- > 0);
}
unsigned char RecUART1(void)
{
while (!(USART1_SR_RXNE)); // USART_SR[5]:RXNE Read data register not empty
PA_ODR |= (1<<2); // 0: Data is not received, 1: Received data is ready to be read.
return USART1_DR;
}
int main( void )
{
PA_DDR = 00000100;// TX on PA2
PA_CR1 = 00000100;
//out ='l';
__disable_interrupt();
InitialiseSystemClock();
InitialiseUART();
__enable_interrupt();
while (1)
{
//out = RecUART1();
PB_ODR = 0; //Turn off all pins
PB_DDR_DDR4 = 1; //PortB, Bit 4 is output (PD4 - Data Direction Register)
PB_CR1_C14 = 1; //PortB, Control Register 1, Bit 4 (PD4) set to Push-Pull
PB_CR2_C24 = 1; //PortB, Control Register 2, Bit 4 (PD4) set to Push-Pull
PB_ODR = 0x10;
delay(30000);
//for (long counter = 0; counter < 250000; counter++);
//sprintf(dis,"this is %c\n",out);
char sz[] = "Hello from STM8 \n\r";
char *z = &sz[0];
UARTPrintF(z);
PB_ODR_bit.ODR4 = !PB_ODR_bit.ODR4;
delay(30000);
}
}
Relevant part of the schematic:
