Лабораторные МПр / код / lab3 / Lab - timer / src / uart

/***************************************
*
*	   LETI traning 2011
*
***************************************/
#include "LPC17xx.h"
#include "uart.h" 

//---
void uart_init(void) {
  LPC_PINCON->PINSEL0 |= (1 << 4);             /* Pin P0.2 used as TXD0 (Com0) */
  LPC_PINCON->PINSEL0 |= (1 << 6);             /* Pin P0.3 used as RXD0 (Com0) */

  LPC_UART0->LCR    = 0x83;                          /* 8 bits, no Parity, 1 Stop bit  */
  LPC_UART0->DLL    = 9;                             /* 115200 Baud Rate @ 25.0 MHZ PCLK */
  LPC_UART0->FDR    = 0x21;                          /* FR 1,507, DIVADDVAL = 1, MULVAL = 2 */
  LPC_UART0->DLM    = 0;                             /* High divisor latch = 0         */
  LPC_UART0->LCR    = 0x03;                          /* DLAB = 0                       */

  LPC_UART0->IER	= 15;
  NVIC_EnableIRQ((IRQn_Type) UART0_IRQn);
}                   

//---
void send_char(char c) {
  while (!(LPC_UART0->LSR & 0x20));	//wait while uart is busy
  ...//send character c
}

//---
void receive_char(void) {
  char c;
  while (!(LPC_UART0->LSR & 0x01)); //wait while uart is busy
  ...//receive character c
  ...//do something with character c
}

//---
void send_string(char* s) {	 //send string by charecters
  while (*s != 0) {
   send_char(*s++);
  }
}

//---
void UART0_IRQHandler(void) __irq {
	...	//what need to do first?
	if(...) {	//check: if interrupted by receive, then  receive_char()
		receive_char();
	}
}