avr_uart.h

来自「AVR 单片机程序设计用到的模拟器」· C头文件 代码 · 共 72 行

/* $Id: AVR_UART.h,v 1.1.1.1 2000/09/24 11:39:10 pure Exp $ */

#ifndef __AVR_UART_h__
#define __AVR_UART_h__

#include "Types.h"
#include "Device.h"
#include "Thread.h"
#include "Semaphore.h"

class AVR_UART : public Device {
protected:
	unsigned mhz;

	byte ubrr, ucr, usr, urxdr, utxdr;
	
	static const int UBRR = 0x29;
	static const int UCR = 0x2a;
	static const int USR = 0x2b;
	static const int UDR = 0x2c;
	
	static const int RXC = 0x80;
	static const int TXC = 0x40;
	static const int UDRE = 0x20;
	static const int FE = 0x10;
	static const int OR = 0x8;
	
	static const int RXCIE = 0x80;
	static const int TXCIE = 0x40;
	static const int UDREIE = 0x20;
	static const int RXEN = 0x10;
	static const int TXEN = 0x8;
	static const int CHR9 = 0x4;
	static const int RXB8 = 0x2;
	static const int TXB8 = 0x1;

	class RXThread : public Thread {
	private:
		AVR_UART& uart;
	public:
		RXThread(AVR_UART&);
		~RXThread();
		Semaphore sem;
		virtual void action();
	} rxthread;
	friend RXThread;
	
	Semaphore sem_tx_ack;
	class TXThread : public Thread {
	private:
		AVR_UART& uart;
	public:
		TXThread(AVR_UART&);
		~TXThread();
		Semaphore sem;
		virtual void action();
	} txthread;
	friend TXThread;
	
public:
	AVR_UART(unsigned _mhz);
	~AVR_UART();

	Device* cs(unsigned addr);
	void clk();
	unsigned irq();
	byte readb(unsigned addr);
	void writeb(unsigned addr, byte data);
};

#endif