uart_int.c

HDMI anx9021的驱动

//********************************************************************************************
//********************************************************************************************
//***************************     Firmware for ANX9021     ***********************************
//********************************************************************************************
//********************************************************************************************

//******************************************************************************
//  ANALOGIX Company 
//  ANX9021 Firmware on AT89C51RC clean for customer
//  Version 1.51	2006/04/27
//******************************************************************************

#include <stdio.h>
#include "uart_int.h"
#include "i2c_intf.h"
#include "mcu.h"

char command_buf[16];
char command_buf_len;
bit term_cmd_valid;
bit fetching_term_cmd;
unsigned char uart_buf[7];
char rx_count;
char tx_left;
bit cmd_valid;
bit ret_valid;

void init_serial(unsigned char mode)
{
	TH1 = mode;
	//TL1 = 0xff;
	TMOD = TMOD & 0x0f | 0x20;
	TR1 = 1;
	SCON = 0x50;//0x70;
	TI = 1;
	RI = 0;
	ES = 1;
	
	rx_count = 0;
	tx_left = 0;
	cmd_valid = 0;
	ret_valid = 0;
	term_cmd_valid = 0;
	fetching_term_cmd = 0;
}

void prot_isr(void)
{
	unsigned char c;
	
	if (TI) {
		TI = 0;	
		if (ret_valid)
			if (tx_left)
				SBUF = uart_buf[--tx_left];
			else
				ret_valid = 0;
			
	}
	if (RI) {
        enable_debug_output = 0;
		RI = 0;
		c = SBUF;
        if (fetching_term_cmd) {
            if (c == '\n' || c == '\r') {
                term_cmd_valid = 1;
                fetching_term_cmd = 0;
            } else if (c == 0x08) 
                command_buf_len--;
            else if (command_buf_len < TERM_CMD_SIZE-1) {
                command_buf[command_buf_len++] = c;
            } else
                c = '*';
            enable_debug_output = 1;
            if (c == '\r')
                putchar('\n');
            else
                putchar(c);
            enable_debug_output = 0;
        } else {
            if ((rx_count != 0) || (c == CMD_READ) || (c == CMD_WRITE))
	           uart_buf[rx_count++] = c;
		    if (rx_count == 7) {
                cmd_valid = 1;
                rx_count = 0;
            }
            if (c == '\\') {
                fetching_term_cmd = 1;
            	command_buf_len = 0;
                enable_debug_output = 1;
                putchar(c);
                enable_debug_output = 0;
            }
        }
	}
}

void send_return(unsigned char status, unsigned char datah, 
	unsigned char datal)
{
	uart_buf[2] = status;
	uart_buf[1] = datah;
	uart_buf[0] = datal;
	tx_left = 3;
	SBUF = RET_ID;
	ret_valid = 1;
}

void process_cmd(void)
{
	char c;
	unsigned char uc;
	
	uc = 0;
	if (uart_buf[0] == CMD_WRITE) {
		if (uart_buf[2] == 0x60)
			c = i2c_write_p0_reg(uart_buf[4], uart_buf[6]);
		else
			c = i2c_write_p1_reg(uart_buf[4], uart_buf[6]);
	} else if (uart_buf[0] == CMD_READ) {
		if (uart_buf[2] == 0x60)
			c = i2c_read_p0_reg(uart_buf[4], &uc);
		else
			c = i2c_read_p1_reg(uart_buf[4], &uc);
	}
	switch (c) {
	case 1: 
		c = ST_DEV_UNKNOWN;
		break;
	case 2:
		c = ST_REG_UNKNOWN;
		break;
	}
	send_return(c, 0x00, uc);
}