363 lines
7.7 KiB
C
363 lines
7.7 KiB
C
/*
|
|
* File : serial.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2006, RT-Thread Development Team
|
|
*
|
|
* The license and distribution terms for this file may be
|
|
* found in the file LICENSE in this distribution or at
|
|
* http://openlab.rt-thread.com/license/LICENSE
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2009-06-11 Bernard first version
|
|
*/
|
|
|
|
#include <rthw.h>
|
|
#include <rtthread.h>
|
|
|
|
#include <inc/hw_types.h>
|
|
#include <inc/hw_memmap.h>
|
|
#include <inc/hw_uart.h>
|
|
#include <inc/hw_ints.h>
|
|
#include <driverlib/gpio.h>
|
|
#include <driverlib/sysctl.h>
|
|
#include <driverlib/interrupt.h>
|
|
|
|
#include <driverlib/uart.h>
|
|
#include "board.h"
|
|
|
|
extern void rt_hw_interrupt_thread_switch(void);
|
|
|
|
#define RT_UART_RX_BUFFER_SIZE 64
|
|
|
|
/* LM3S serial device */
|
|
struct rt_lm3s_serial
|
|
{
|
|
/* inherit from device */
|
|
struct rt_device parent;
|
|
|
|
rt_uint32_t hw_base;
|
|
rt_uint32_t baudrate;
|
|
|
|
/* reception field */
|
|
rt_uint16_t save_index, read_index;
|
|
rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
|
|
};
|
|
|
|
#ifdef RT_USING_UART1
|
|
struct rt_lm3s_serial serial1;
|
|
#endif
|
|
#ifdef RT_USING_UART2
|
|
struct rt_lm3s_serial serial2;
|
|
#endif
|
|
|
|
void rt_hw_serial_init(void);
|
|
|
|
void rt_hw_uart_isr(struct rt_lm3s_serial* serial)
|
|
{
|
|
rt_device_t device;
|
|
rt_uint32_t status;
|
|
|
|
device = (struct rt_device*)serial;
|
|
status = UARTIntStatus(serial->hw_base, true);
|
|
|
|
/* clear interrupt status */
|
|
UARTIntClear(serial->hw_base, status);
|
|
|
|
if (device->flag & RT_DEVICE_FLAG_INT_RX)
|
|
{
|
|
char ch;
|
|
rt_base_t level;
|
|
|
|
while (UARTCharsAvail(serial->hw_base))
|
|
{
|
|
ch = UARTCharGetNonBlocking(serial->hw_base);
|
|
|
|
/* disable interrupt */
|
|
level = rt_hw_interrupt_disable();
|
|
|
|
/* read character */
|
|
serial->rx_buffer[serial->save_index] = ch;
|
|
serial->save_index ++;
|
|
if (serial->save_index >= RT_UART_RX_BUFFER_SIZE)
|
|
serial->save_index = 0;
|
|
|
|
/* if the next position is read index, discard this 'read char' */
|
|
if (serial->save_index == serial->read_index)
|
|
{
|
|
serial->read_index ++;
|
|
if (serial->read_index >= RT_UART_RX_BUFFER_SIZE)
|
|
serial->read_index = 0;
|
|
}
|
|
|
|
/* enable interrupt */
|
|
rt_hw_interrupt_enable(level);
|
|
}
|
|
|
|
/* invoke callback */
|
|
if(device->rx_indicate != RT_NULL)
|
|
{
|
|
rt_int32_t length;
|
|
|
|
length = serial->save_index - serial->read_index;
|
|
if (length < 0) length += RT_UART_RX_BUFFER_SIZE;
|
|
device->rx_indicate(device, length);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef RT_USING_UART1
|
|
void rt_hw_uart_isr_1(int irqno)
|
|
{
|
|
/* enter interrupt */
|
|
rt_interrupt_enter();
|
|
|
|
/* get serial device */
|
|
rt_hw_uart_isr(&serial1);
|
|
|
|
/* leave interrupt */
|
|
rt_interrupt_leave();
|
|
rt_hw_interrupt_thread_switch();
|
|
}
|
|
#endif
|
|
|
|
#ifdef RT_USING_UART2
|
|
void rt_hw_uart_isr_2(int irqno)
|
|
{
|
|
/* enter interrupt */
|
|
rt_interrupt_enter();
|
|
|
|
/* get serial device */
|
|
rt_hw_uart_isr(&serial2);
|
|
|
|
/* leave interrupt */
|
|
rt_interrupt_leave();
|
|
rt_hw_interrupt_thread_switch();
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @addtogroup LM3S
|
|
*/
|
|
/*@{*/
|
|
|
|
static rt_err_t rt_serial_init (rt_device_t dev)
|
|
{
|
|
return RT_EOK;
|
|
}
|
|
|
|
static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
|
|
{
|
|
struct rt_lm3s_serial* serial;
|
|
serial = (struct rt_lm3s_serial*) dev;
|
|
|
|
RT_ASSERT(serial != RT_NULL);
|
|
|
|
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
|
|
{
|
|
/* enable interrupt */
|
|
if (serial->hw_base == UART0_BASE)
|
|
IntEnable(INT_UART0);
|
|
else if (serial->hw_base == UART1_BASE)
|
|
IntEnable(INT_UART1);
|
|
|
|
UARTIntEnable(serial->hw_base, UART_INT_RX | UART_INT_RT);
|
|
}
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
static rt_err_t rt_serial_close(rt_device_t dev)
|
|
{
|
|
struct rt_lm3s_serial* serial;
|
|
serial = (struct rt_lm3s_serial*) dev;
|
|
|
|
RT_ASSERT(serial != RT_NULL);
|
|
|
|
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
|
|
{
|
|
/* disable UART rx interrupt */
|
|
UARTIntDisable(serial->hw_base, UART_INT_RX | UART_INT_RT);
|
|
}
|
|
|
|
return RT_EOK;
|
|
}
|
|
|
|
static rt_err_t rt_serial_control(rt_device_t dev, int cmd, void *args)
|
|
{
|
|
return RT_EOK;
|
|
}
|
|
|
|
static rt_size_t rt_serial_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
|
|
{
|
|
rt_uint8_t* ptr;
|
|
struct rt_lm3s_serial *serial = (struct rt_lm3s_serial*)dev;
|
|
RT_ASSERT(serial != RT_NULL);
|
|
|
|
/* point to buffer */
|
|
ptr = (rt_uint8_t*) buffer;
|
|
|
|
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
|
|
{
|
|
while (size)
|
|
{
|
|
/* interrupt receive */
|
|
rt_base_t level;
|
|
|
|
/* disable interrupt */
|
|
level = rt_hw_interrupt_disable();
|
|
if (serial->read_index != serial->save_index)
|
|
{
|
|
*ptr = serial->rx_buffer[serial->read_index];
|
|
|
|
serial->read_index ++;
|
|
if (serial->read_index >= RT_UART_RX_BUFFER_SIZE)
|
|
serial->read_index = 0;
|
|
}
|
|
else
|
|
{
|
|
/* no data in rx buffer */
|
|
|
|
/* enable interrupt */
|
|
rt_hw_interrupt_enable(level);
|
|
break;
|
|
}
|
|
|
|
/* enable interrupt */
|
|
rt_hw_interrupt_enable(level);
|
|
|
|
ptr ++; size --;
|
|
}
|
|
|
|
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
|
|
}
|
|
else if (dev->flag & RT_DEVICE_FLAG_DMA_RX)
|
|
{
|
|
/* not support right now */
|
|
RT_ASSERT(0);
|
|
}
|
|
|
|
/* polling mode */
|
|
while (size)
|
|
{
|
|
*ptr = UARTCharGetNonBlocking(serial->hw_base);
|
|
|
|
ptr ++; size --;
|
|
}
|
|
|
|
return (rt_size_t)ptr - (rt_size_t)buffer;
|
|
}
|
|
|
|
static rt_size_t rt_serial_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
|
|
{
|
|
struct rt_lm3s_serial* serial;
|
|
char *ptr;
|
|
|
|
serial = (struct rt_lm3s_serial*) dev;
|
|
if (dev->flag & RT_DEVICE_FLAG_INT_TX)
|
|
{
|
|
/* not support */
|
|
RT_ASSERT(0);
|
|
}
|
|
else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
|
|
{
|
|
/* not support */
|
|
RT_ASSERT(0);
|
|
}
|
|
|
|
/* polling write */
|
|
ptr = (char *)buffer;
|
|
|
|
if (dev->flag & RT_DEVICE_FLAG_STREAM)
|
|
{
|
|
/* stream mode */
|
|
while (size)
|
|
{
|
|
if (*ptr == '\n')
|
|
while (UARTCharPutNonBlocking(serial->hw_base, '\r') == false);
|
|
|
|
while (UARTCharPutNonBlocking(serial->hw_base, *ptr) == false);
|
|
|
|
ptr ++;
|
|
size --;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (size)
|
|
{
|
|
while (UARTCharPutNonBlocking(serial->hw_base, *ptr) == false);
|
|
|
|
ptr ++;
|
|
size --;
|
|
}
|
|
}
|
|
|
|
return (rt_size_t) ptr - (rt_size_t) buffer;
|
|
}
|
|
|
|
void rt_hw_serial_init(void)
|
|
{
|
|
struct rt_lm3s_serial* serial;
|
|
|
|
#ifdef RT_USING_UART1
|
|
serial = &serial1;
|
|
|
|
serial->parent.type = RT_Device_Class_Char;
|
|
|
|
serial->hw_base = UART0_BASE;
|
|
serial->baudrate = 115200;
|
|
|
|
rt_memset(serial->rx_buffer, 0, sizeof(serial->rx_buffer));
|
|
serial->read_index = serial->save_index = 0;
|
|
|
|
/* enable UART0 clock */
|
|
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
|
|
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
|
|
|
|
/* set UART0 pinmux */
|
|
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
|
|
|
|
/* Configure the UART for 115,200, 8-N-1 operation. */
|
|
UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), serial->baudrate,
|
|
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
|
|
UART_CONFIG_PAR_NONE));
|
|
|
|
serial->parent.init = rt_serial_init;
|
|
serial->parent.open = rt_serial_open;
|
|
serial->parent.close = rt_serial_close;
|
|
serial->parent.read = rt_serial_read;
|
|
serial->parent.write = rt_serial_write;
|
|
serial->parent.control = rt_serial_control;
|
|
serial->parent.user_data = RT_NULL;
|
|
|
|
rt_device_register(&serial->parent,
|
|
"uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
|
|
#endif
|
|
|
|
#ifdef RT_USING_UART2
|
|
serial = &serial2;
|
|
|
|
serial->parent.type = RT_Device_Class_Char;
|
|
|
|
serial->hw_base = 0xE0010000;
|
|
serial->baudrate = 115200;
|
|
|
|
rt_memset(serial->rx_buffer, 0, sizeof(serial->rx_buffer));
|
|
serial->read_index = serial->save_index = 0;
|
|
|
|
serial->parent.init = rt_serial_init;
|
|
serial->parent.open = rt_serial_open;
|
|
serial->parent.close = rt_serial_close;
|
|
serial->parent.read = rt_serial_read;
|
|
serial->parent.write = rt_serial_write;
|
|
serial->parent.control = rt_serial_control;
|
|
serial->parent.user_data = RT_NULL;
|
|
|
|
rt_device_register(&serial->parent,
|
|
"uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
|
|
#endif
|
|
}
|
|
|
|
/*@}*/
|