150 lines
3.0 KiB
C
150 lines
3.0 KiB
C
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/*
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* File : serial.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2006-08-23 Bernard first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "lpc214x.h"
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#include "board.h"
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void rt_serial_init(void);
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#define PCLK 18000000
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#define BAUD_RATE 115200
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#define U0PINS 0x00000005
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/**
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* @addtogroup LPC2100
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*/
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/*@{*/
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/**
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* This function is used to display a string on console, normally, it's
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* invoked by rt_kprintf
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*
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* @param str the displayed string
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*/
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void rt_console_puts(const char* str)
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{
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while (*str)
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{
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rt_serial_putc (*str++);
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}
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}
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#define UART_RX_BUFFER_SIZE 64
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static rt_uint8_t uart_rx_buffer[UART_RX_BUFFER_SIZE];
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static rt_uint32_t uart_read_index, uart_save_index;
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/**
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* This function initializes serial
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*/
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void rt_serial_init()
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{
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unsigned long Fdiv;
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PINSEL0 = 0x00000050; /* RxD0 and TxD0 */
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rt_memset(uart_rx_buffer, 0, sizeof(uart_rx_buffer));
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uart_read_index = uart_save_index = 0;
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U0LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
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/*PCLK select is 00,so /4*/
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Fdiv = ( PCLK / 16 ) / BAUD_RATE ; /*baud rate */
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U0DLM = Fdiv / 256;
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U0DLL = Fdiv % 256;
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U0FCR = 0x00; /* Enable and reset TX and RX FIFO. */
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U0LCR = 0x03; /* DLAB = 0 */
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}
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/* save a char to serial buffer */
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void rt_serial_savechar(char ch)
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{
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rt_base_t level;
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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uart_rx_buffer[uart_save_index] = ch;
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uart_save_index ++;
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if (uart_save_index >= UART_RX_BUFFER_SIZE)
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uart_save_index = 0;
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/* if the next position is read index, discard this 'read char' */
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if (uart_save_index == uart_read_index)
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{
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uart_read_index ++;
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if (uart_read_index >= UART_RX_BUFFER_SIZE)
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uart_read_index = 0;
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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}
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/**
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* This function read a character from serial without interrupt enable mode
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*
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* @return the read char
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*/
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char rt_serial_getc()
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{
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char ch;
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rt_base_t level;
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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if (uart_read_index != uart_save_index)
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{
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ch = uart_rx_buffer[uart_read_index];
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uart_read_index ++;
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if (uart_read_index >= UART_RX_BUFFER_SIZE)
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uart_read_index = 0;
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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return ch;
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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return 0;
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}
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/**
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* This function will write a character to serial without interrupt enable mode
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*
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* @param c the char to write
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*/
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void rt_serial_putc(const char c)
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{
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/*
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to be polite with serial console add a line feed
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to the carriage return character
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*/
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if (c=='\n')
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{
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while (!(U0LSR & 0x20));
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U0THR = '\r';
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}
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while (!(U0LSR & 0x20));
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U0THR = c;
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}
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/*@}*/
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