uart_int.c

display port接受芯片ANX9813的驱动代码。MCU使用LPC936FDH,内部包含AN9813寄存器设置

//  *******************************************

//  *******************************************

#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;*/
	
      //lllll, 19200 baud rate 
	SCON=0x50;				  // select BRG as UART Baud Rate Gen
       SSTAT=0x00;               // separate Rx / Tx interrupts
	BRGCON=0x00; 
       BRGR0=0x70;				  // setup BRG for 19200 baud @ 7.373(7372800)MHz internal RC oscillator
       BRGR1=0x01;
       BRGCON = 0x03;     	      // enable BRG
	
	rx_count = 0;
	tx_left = 0;
	cmd_valid = 0;
	ret_valid = 0;
	term_cmd_valid = 0;
	fetching_term_cmd = 0;
}
//函数来自UartI2c，变量取DPDEMO
void UART_ISR(void) 	 
{
	uchar temp;
	if(RI==1)
	{
		RI = 0;//
		temp=SBUF;
		LED=~LED;
		//sendRQ = 1;
		if(command_buf_len==0 && temp==0x2a)
		{
			   
			command_buf[command_buf_len++]=temp;

		}
		else if(command_buf_len>0 && command_buf_len<5)
		{
			command_buf[command_buf_len++]=temp;	
		}
		else if(command_buf_len==5 && temp==0x0d)
		{
			command_buf[5]=0x0d;
			command_buf_len=0;
			sendRQ = 1;
		}
		else
		{
			command_buf_len=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;
	B_puts("aaaaaaa");
	uc = 0;
	if (uart_buf[0] == CMD_WRITE) {
		if (uart_buf[2] == PORT0_ADDR)
			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] == PORT0_ADDR)
			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);
}