uart

#include <intrinsics.h>
#include<iostm8s003f3.h>
#include<stdint.h>
/**********************/
/*define block*/

#define   SetBit(reg, bit)          reg |= (1<<bit)
#define   ClearBit(reg, bit)       reg &= (~(1<<bit))
#define   InvBit(reg, bit)          reg ^= (1<<bit)
#define   BitIsSet(reg, bit)       ((reg & (1<<bit)) != 0)
#define   BitIsClear(reg, bit)    ((reg & (1<<bit)) == 0)

/**********************/
/*variable block*/
uint8_t dev_addr;/*dev address for I2C*/

/*************************/
/*function declaration block*/
static void clock_init(void);
static void port_init(void);/*init port for module*/
static void uart_init(void);/*init uart set*/
static void uart_send(unsigned char data);
__interrupt void UART1_RXE(void);
/*static void i2c_init(void);*/
 /************************/
/*function definition block*/
static void clock_init(void){
   CLK_ICKR|=(1<<0);/*enable hight speed internal RC oscillator */
   CLK_CKDIVR|=(1<<4|1<<3|1<<2|1<<1|1<<0);/*enable RC prescale/1*/
}
static void port_init(void){
  PD_DDR|=(1<<5);/*UART TX as output*/
  PB_DDR|=(1<<5);/*SDA as output*/
}
static void uart_init(void){
  UART1_BRR2=0x03U;/*set baudrate 9600*/
  UART1_BRR1=0x68U;/*with 0.02% error*/
  UART1_CR2|=(1<<5);/*reciever interrupt enable*/
  UART1_CR2|=(1<<3);/*transmitter enable*/
  UART1_CR2|=(1<<2);/*reciever enable*/
}
/*uint8_t read_addr(void){
return 0xff;
}*/
/*static void uart_send(unsigned char data){
  while(!UART1_SR_TXE){
    UART1_DR=data;
  }
}*/
int main(void){
  clock_init();
  port_init();
  uart_init();
  __enable_interrupt();
  PD_ODR|=(1<<3);

  while(1){
/*uart_send(0xffU);*/
    PD_ODR^=(1<<3);

  }
}
__interrupt void UART1_RXE(void)
     {
          UART1_DR=UART1_DR;
     }