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rt-thread-official/bsp/lpc178x/drivers/uart.c

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/*
* File : board.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009 RT-Thread Develop Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2010-03-08 Bernard The first version for LPC17xx
* 2010-05-02 Aozima update CMSIS to 130
*/
#include <rthw.h>
#include <rtthread.h>
#include "board.h"
#include "LPC177x_8x.h"
#include "lpc177x_8x_uart.h"
#include "lpc177x_8x_pinsel.h"
#define IER_RBR 0x01
#define IER_THRE 0x02
#define IER_RLS 0x04
#define IIR_PEND 0x01
#define IIR_RLS 0x03
#define IIR_RDA 0x02
#define IIR_CTI 0x06
#define IIR_THRE 0x01
#define LSR_RDR 0x01
#define LSR_OE 0x02
#define LSR_PE 0x04
#define LSR_FE 0x08
#define LSR_BI 0x10
#define LSR_THRE 0x20
#define LSR_TEMT 0x40
#define LSR_RXFE 0x80
/**
* @addtogroup LPC11xx
*/
/*@{*/
struct rt_uart_lpc
{
struct rt_device parent;
LPC_UART_TypeDef * UART;
IRQn_Type UART_IRQn;
/* buffer for reception */
rt_uint8_t read_index, save_index;
rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
};
#ifdef RT_USING_UART0
struct rt_uart_lpc uart0_device;
#endif
#ifdef RT_USING_UART1
struct rt_uart_lpc uart1_device;
#endif
void UART0_IRQHandler(void)
{
rt_ubase_t level, iir;
struct rt_uart_lpc* uart = &uart0_device;
/* enter interrupt */
rt_interrupt_enter();
/* read IIR and clear it */
iir = uart->UART->IIR;
iir >>= 1; /* skip pending bit in IIR */
iir &= 0x07; /* check bit 1~3, interrupt identification */
if (iir == IIR_RDA) /* Receive Data Available */
{
/* Receive Data Available */
uart->rx_buffer[uart->save_index] = uart->UART->RBR;
level = rt_hw_interrupt_disable();
uart->save_index ++;
if (uart->save_index >= RT_UART_RX_BUFFER_SIZE)
uart->save_index = 0;
rt_hw_interrupt_enable(level);
/* invoke callback */
if(uart->parent.rx_indicate != RT_NULL)
{
rt_size_t length;
if (uart->read_index > uart->save_index)
length = RT_UART_RX_BUFFER_SIZE - uart->read_index + uart->save_index;
else
length = uart->save_index - uart->read_index;
uart->parent.rx_indicate(&uart->parent, length);
}
}
/* leave interrupt */
rt_interrupt_leave();
return;
}
void UART1_IRQHandler(void)
{
rt_ubase_t level, iir;
struct rt_uart_lpc* uart = &uart1_device;
/* enter interrupt */
rt_interrupt_enter();
/* read IIR and clear it */
iir = uart->UART->IIR;
// iir >>= 1; /* skip pending bit in IIR */
// iir &= 0x07; /* check bit 1~3, interrupt identification */
if (iir == UART_IIR_INTID_RDA) /* Receive Data Available */
{
/* Receive Data Available */
uart->rx_buffer[uart->save_index] = uart->UART->RBR;
level = rt_hw_interrupt_disable();
uart->save_index ++;
if (uart->save_index >= RT_UART_RX_BUFFER_SIZE)
uart->save_index = 0;
rt_hw_interrupt_enable(level);
/* invoke callback */
if(uart->parent.rx_indicate != RT_NULL)
{
rt_size_t length;
if (uart->read_index > uart->save_index)
length = RT_UART_RX_BUFFER_SIZE - uart->read_index + uart->save_index;
else
length = uart->save_index - uart->read_index;
uart->parent.rx_indicate(&uart->parent, length);
}
}
/* leave interrupt */
rt_interrupt_leave();
return;
}
static rt_err_t rt_uart_init (rt_device_t dev)
{
struct rt_uart_lpc *uart = (struct rt_uart_lpc*)dev;
UART_CFG_Type UART_ConfigStruct;
#ifdef RT_USING_UART0
if( uart->UART == LPC_UART0 )
{
/*
* Initialize UART0 pin connect
* P0.2: TXD
* P0.3: RXD
*/
PINSEL_ConfigPin(0, 2, 1);
PINSEL_ConfigPin(0, 2, 1);
UART_ConfigStruct.Baud_rate = 115200;
UART_ConfigStruct.Databits = UART_DATABIT_8;
UART_ConfigStruct.Parity = UART_PARITY_NONE;
UART_ConfigStruct.Stopbits = UART_STOPBIT_1;
UART_Init( uart->UART, &UART_ConfigStruct);
// Enable UART Transmit
UART_TxCmd( uart->UART, ENABLE);
UART_IntConfig( uart->UART, UART_INTCFG_RLS, ENABLE);
}
#endif
#ifdef RT_USING_UART1
if( ((LPC_UART1_TypeDef *)uart->UART) == LPC_UART1 )
{
/*
* Initialize UART1 pin connect
* P3.16: TXD
* P3.17: RXD
*/
PINSEL_ConfigPin(3, 16, 3);
PINSEL_ConfigPin(3, 17, 3);
UART_ConfigStruct.Baud_rate = 115200;
UART_ConfigStruct.Databits = UART_DATABIT_8;
UART_ConfigStruct.Parity = UART_PARITY_NONE;
UART_ConfigStruct.Stopbits = UART_STOPBIT_1;
UART_Init( uart->UART,&UART_ConfigStruct);
// Enable UART Transmit
UART_TxCmd( uart->UART, ENABLE);
UART_IntConfig( uart->UART, UART_INTCFG_RLS, ENABLE);
UART_IntConfig( uart->UART, UART_INTCFG_RBR, ENABLE);
}
#endif
#ifdef RT_USING_UART2
if( uart->UART == LPC_UART2 )
{
}
#endif
return RT_EOK;
}
static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
{
struct rt_uart_lpc *uart = (struct rt_uart_lpc*)dev;
RT_ASSERT(dev != RT_NULL);
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* Enable the UART Interrupt */
NVIC_EnableIRQ( uart->UART_IRQn );
}
return RT_EOK;
}
static rt_err_t rt_uart_close(rt_device_t dev)
{
struct rt_uart_lpc *uart = (struct rt_uart_lpc*)dev;
RT_ASSERT(dev != RT_NULL);
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* Disable the UART Interrupt */
NVIC_DisableIRQ( uart->UART_IRQn );
}
return RT_EOK;
}
static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
rt_uint8_t* ptr;
struct rt_uart_lpc *uart = (struct rt_uart_lpc*)dev;
RT_ASSERT(uart != 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 (uart->read_index != uart->save_index)
{
*ptr = uart->rx_buffer[uart->read_index];
uart->read_index ++;
if (uart->read_index >= RT_UART_RX_BUFFER_SIZE)
uart->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;
}
return 0;
}
static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
struct rt_uart_lpc *uart = (struct rt_uart_lpc*)dev;
char *ptr;
ptr = (char*)buffer;
if (dev->flag & RT_DEVICE_FLAG_STREAM)
{
/* stream mode */
while (size)
{
if (*ptr == '\n')
{
while (!(uart->UART->LSR & UART_LSR_THRE));
UART_SendByte( uart->UART,'\r');
}
while (!(uart->UART->LSR & UART_LSR_THRE));
UART_SendByte( uart->UART,*ptr);
ptr ++;
size --;
}
}
else
{
UART_Send( uart->UART, (uint8_t *)buffer, size, BLOCKING);
}
return (rt_size_t) ptr - (rt_size_t) buffer;
}
void rt_hw_uart_init(void)
{
struct rt_uart_lpc* uart;
#ifdef RT_USING_UART0
/* get uart device */
uart = &uart0_device;
uart0_device.UART = LPC_UART0;
uart0_device.UART_IRQn = UART0_IRQn;
/* device initialization */
uart->parent.type = RT_Device_Class_Char;
rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
uart->read_index = uart->save_index = 0;
/* device interface */
uart->parent.init = rt_uart_init;
uart->parent.open = rt_uart_open;
uart->parent.close = rt_uart_close;
uart->parent.read = rt_uart_read;
uart->parent.write = rt_uart_write;
uart->parent.control = RT_NULL;
uart->parent.user_data = RT_NULL;
rt_device_register(&uart->parent,
"uart0", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
#endif
#ifdef RT_USING_UART1
/* get uart device */
uart = &uart1_device;
uart1_device.UART = (LPC_UART_TypeDef *)LPC_UART1;
uart1_device.UART_IRQn = UART1_IRQn;
/* device initialization */
uart->parent.type = RT_Device_Class_Char;
rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
uart->read_index = uart->save_index = 0;
/* device interface */
uart->parent.init = rt_uart_init;
uart->parent.open = rt_uart_open;
uart->parent.close = rt_uart_close;
uart->parent.read = rt_uart_read;
uart->parent.write = rt_uart_write;
uart->parent.control = RT_NULL;
uart->parent.user_data = RT_NULL;
rt_device_register(&uart->parent,
"uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
#endif
}
/*@}*/
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