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#include <stdint.h>
#include <stdio.h>
#include <ctype.h>
#define DEVICE DEV_STM8S208
#include "stm8.h"
volatile unsigned char *sif= (unsigned char *)0x7fff;
int sifchar(int c)
{
*sif= 'p';
*sif= c;
return c;
}
int putchar(int c)
{
while(!(USART->sr & USART_SR_TXE));
USART->dr = c;
return c;
}
volatile uint8_t rx_buf[8];
volatile uint8_t first_free= 0;
volatile uint8_t last_used= 0;
void isr_rx(void) __interrupt(USART_RX_IRQ)
{
volatile uint8_t d;
*sif='p';*sif='I';
if (USART->sr & USART_SR_RXNE)
{
uint8_t n;
d= USART->dr;
n= (first_free+1)%8;
if (n != last_used)
{
rx_buf[first_free]= d;
first_free= n;
}
}
}
char received()
{
//return UART2_SR & UART_SR_RXNE;
return first_free != last_used;
}
char getchar()
{
uint8_t o;
while (!received())
;
o= last_used;
last_used= (last_used+1)%8;
return rx_buf[o];
}
void prints(char *s)
{
char i= 0;
while (s[i])
{
putchar(s[i]);
i++;
}
}
void main(void)
{
unsigned long i = 0;
CLK->ckdivr = 0x00; // Set the frequency to 16 MHz
CLK->pckenr1 = 0xFF; // Enable peripherals
USART->cr2 = USART_CR2_TEN | USART_CR2_REN; // Allow TX and RX
USART->cr3 &= ~(USART_CR3_STOP1 | USART_CR3_STOP2); // 1 stop bit
USART->brr2 = 0x03;
USART->brr1 = 0x68; // 9600 baud
USART->cr2|= USART_CR2_RIEN;
EI;
printf("Hello World!\n");
for (;;)
{
if (received())
{
char c= getchar();
*sif= 'x';*sif= c;
putchar(toupper(c));
}
}
}
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