363 lines
7.7 KiB
C
363 lines
7.7 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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* 2009-06-11 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 <inc/hw_types.h>
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#include <inc/hw_memmap.h>
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#include <inc/hw_uart.h>
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#include <inc/hw_ints.h>
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#include <driverlib/gpio.h>
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#include <driverlib/sysctl.h>
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#include <driverlib/interrupt.h>
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#include <uart.h>
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#include "board.h"
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extern void rt_hw_interrupt_thread_switch(void);
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#define RT_UART_RX_BUFFER_SIZE 64
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/* LM3S serial device */
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struct rt_lm3s_serial
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{
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/* inherit from device */
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struct rt_device parent;
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rt_uint32_t hw_base;
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rt_uint32_t baudrate;
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/* reception field */
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rt_uint16_t save_index, read_index;
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rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
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};
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#ifdef RT_USING_UART1
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struct rt_lm3s_serial serial1;
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#endif
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#ifdef RT_USING_UART2
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struct rt_lm3s_serial serial2;
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#endif
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void rt_hw_serial_init(void);
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void rt_hw_uart_isr(struct rt_lm3s_serial* serial)
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{
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rt_device_t device;
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rt_uint32_t status;
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device = (struct rt_device*)serial;
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UARTIntStatus(serial->hw_base, true);
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/* clear interrupt status */
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UARTIntClear(serial->hw_base, status);
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if (device->flag & RT_DEVICE_FLAG_INT_RX)
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{
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char ch;
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rt_base_t level;
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while (UARTCharsAvail(serial->hw_base))
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{
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ch = UARTCharGetNonBlocking(serial->hw_base);
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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/* read character */
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serial->rx_buffer[serial->save_index] = ch;
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serial->save_index ++;
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if (serial->save_index >= RT_UART_RX_BUFFER_SIZE)
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serial->save_index = 0;
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/* if the next position is read index, discard this 'read char' */
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if (serial->save_index == serial->read_index)
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{
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serial->read_index ++;
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if (serial->read_index >= RT_UART_RX_BUFFER_SIZE)
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serial->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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/* invoke callback */
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if(device->rx_indicate != RT_NULL)
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{
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rt_int32_t length;
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length = serial->save_index - serial->read_index;
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if (length < 0) length += RT_UART_RX_BUFFER_SIZE;
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device->rx_indicate(device, length);
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}
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}
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}
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#ifdef RT_USING_UART1
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void rt_hw_uart_isr_1(int irqno)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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/* get serial device */
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rt_hw_uart_isr(&serial1);
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/* leave interrupt */
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rt_interrupt_leave();
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rt_hw_interrupt_thread_switch();
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}
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#endif
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#ifdef RT_USING_UART2
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void rt_hw_uart_isr_2(int irqno)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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/* get serial device */
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rt_hw_uart_isr(&serial2);
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/* leave interrupt */
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rt_interrupt_leave();
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rt_hw_interrupt_thread_switch();
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}
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#endif
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/**
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* @addtogroup LM3S
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*/
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/*@{*/
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static rt_err_t rt_serial_init (rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
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{
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struct rt_lm3s_serial* serial;
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serial = (struct rt_lm3s_serial*) dev;
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RT_ASSERT(serial != RT_NULL);
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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/* enable interrupt */
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if (serial->hw_base == UART0_BASE)
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IntEnable(INT_UART0);
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else if (serial->hw_base == UART1_BASE)
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IntEnable(INT_UART1);
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UARTIntEnable(serial->hw_base, UART_INT_RX | UART_INT_RT);
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}
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return RT_EOK;
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}
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static rt_err_t rt_serial_close(rt_device_t dev)
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{
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struct rt_lm3s_serial* serial;
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serial = (struct rt_lm3s_serial*) dev;
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RT_ASSERT(serial != RT_NULL);
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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/* disable UART rx interrupt */
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UARTIntDisable(serial->hw_base, UART_INT_RX | UART_INT_RT);
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}
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return RT_EOK;
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}
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static rt_err_t rt_serial_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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return RT_EOK;
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}
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static rt_size_t rt_serial_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
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{
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rt_uint8_t* ptr;
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struct rt_lm3s_serial *serial = (struct rt_lm3s_serial*)dev;
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RT_ASSERT(serial != RT_NULL);
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/* point to buffer */
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ptr = (rt_uint8_t*) buffer;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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while (size)
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{
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/* interrupt receive */
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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 (serial->read_index != serial->save_index)
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{
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*ptr = serial->rx_buffer[serial->read_index];
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serial->read_index ++;
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if (serial->read_index >= RT_UART_RX_BUFFER_SIZE)
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serial->read_index = 0;
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}
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else
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{
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/* no data in rx buffer */
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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break;
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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ptr ++; size --;
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}
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return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
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}
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else if (dev->flag & RT_DEVICE_FLAG_DMA_RX)
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{
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/* not support right now */
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RT_ASSERT(0);
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}
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/* polling mode */
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while (size)
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{
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*ptr = UARTCharGetNonBlocking(serial->hw_base);
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ptr ++; size --;
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}
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return (rt_size_t)ptr - (rt_size_t)buffer;
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}
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static rt_size_t rt_serial_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
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{
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struct rt_lm3s_serial* serial;
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char *ptr;
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serial = (struct rt_lm3s_serial*) dev;
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if (dev->flag & RT_DEVICE_FLAG_INT_TX)
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{
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/* not support */
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RT_ASSERT(0);
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}
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else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
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{
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/* not support */
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RT_ASSERT(0);
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}
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/* polling write */
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ptr = (char *)buffer;
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if (dev->flag & RT_DEVICE_FLAG_STREAM)
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{
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/* stream mode */
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while (size)
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{
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if (*ptr == '\n')
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while (UARTCharPutNonBlocking(serial->hw_base, '\r') == false);
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while (UARTCharPutNonBlocking(serial->hw_base, *ptr) == false);
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ptr ++;
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size --;
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}
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}
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else
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{
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while (size)
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{
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while (UARTCharPutNonBlocking(serial->hw_base, *ptr) == false);
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ptr ++;
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size --;
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}
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}
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return (rt_size_t) ptr - (rt_size_t) buffer;
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}
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void rt_hw_serial_init(void)
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{
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struct rt_lm3s_serial* serial;
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#ifdef RT_USING_UART1
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serial = &serial1;
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serial->parent.type = RT_Device_Class_Char;
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serial->hw_base = UART0_BASE;
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serial->baudrate = 115200;
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rt_memset(serial->rx_buffer, 0, sizeof(serial->rx_buffer));
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serial->read_index = serial->save_index = 0;
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/* enable UART0 clock */
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SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
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SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
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/* set UART0 pinmux */
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GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
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/* Configure the UART for 115,200, 8-N-1 operation. */
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UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), serial->baudrate,
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(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
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UART_CONFIG_PAR_NONE));
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serial->parent.init = rt_serial_init;
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serial->parent.open = rt_serial_open;
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serial->parent.close = rt_serial_close;
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serial->parent.read = rt_serial_read;
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serial->parent.write = rt_serial_write;
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serial->parent.control = rt_serial_control;
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serial->parent.private = RT_NULL;
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rt_device_register(&serial->parent,
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"uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
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#endif
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#ifdef RT_USING_UART2
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serial = &serial2;
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serial->parent.type = RT_Device_Class_Char;
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serial->hw_base = 0xE0010000;
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serial->baudrate = 115200;
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rt_memset(serial->rx_buffer, 0, sizeof(serial->rx_buffer));
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serial->read_index = serial->save_index = 0;
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serial->parent.init = rt_serial_init;
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serial->parent.open = rt_serial_open;
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serial->parent.close = rt_serial_close;
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serial->parent.read = rt_serial_read;
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serial->parent.write = rt_serial_write;
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serial->parent.control = rt_serial_control;
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serial->parent.private = RT_NULL;
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rt_device_register(&serial->parent,
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"uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
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#endif
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}
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/*@}*/
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