rt-thread-official/bsp/lm4f232/drivers/serial.c

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/*
* 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, rt_uint8_t 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
}
/*@}*/