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rt-thread-official/bsp/mb9bf568r/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://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2006-03-13 Bernard first version
* 2011-05-15 lgnq modified according bernard's implementaion.
*/
#include <rtthread.h>
#include "serial.h"
/**
* @addtogroup FM4 MB9BF568R
*/
/*@{*/
/* RT-Thread Device Interface */
/**
* This function initializes serial
*/
static rt_err_t rt_serial_init (rt_device_t dev)
{
struct serial_device* uart = (struct serial_device*) dev->user_data;
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
rt_memset(uart->int_rx->rx_buffer, 0,
sizeof(uart->int_rx->rx_buffer));
uart->int_rx->read_index = uart->int_rx->save_index = 0;
}
if (dev->flag & RT_DEVICE_FLAG_INT_TX)
{
rt_memset(uart->int_tx->tx_buffer, 0,
sizeof(uart->int_tx->tx_buffer));
uart->int_tx->write_index = uart->int_tx->save_index = 0;
}
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
return RT_EOK;
}
/* save a char to serial buffer */
static void rt_serial_savechar(struct serial_device* uart, char ch)
{
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
uart->int_rx->rx_buffer[uart->int_rx->save_index] = ch;
uart->int_rx->save_index ++;
if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)
uart->int_rx->save_index = 0;
/* if the next position is read index, discard this 'read char' */
if (uart->int_rx->save_index == uart->int_rx->read_index)
{
uart->int_rx->read_index ++;
if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
uart->int_rx->read_index = 0;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
{
struct serial_device* uart;
RT_ASSERT(dev != RT_NULL);
uart = (struct serial_device*) dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* enable interrupt */
UART_ENABLE_IRQ(uart->rx_irq);
}
return RT_EOK;
}
static rt_err_t rt_serial_close(rt_device_t dev)
{
struct serial_device* uart;
RT_ASSERT(dev != RT_NULL);
uart = (struct serial_device*) dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* disable interrupt */
UART_DISABLE_IRQ(uart->rx_irq);
}
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;
rt_err_t err_code;
struct serial_device* uart;
ptr = buffer;
err_code = RT_EOK;
uart = (struct serial_device*)dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
rt_base_t level;
/* interrupt mode Rx */
while (size)
{
if (uart->int_rx->read_index != uart->int_rx->save_index)
{
*ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];
size --;
/* disable interrupt */
level = rt_hw_interrupt_disable();
uart->int_rx->read_index ++;
if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
uart->int_rx->read_index = 0;
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
else
{
/* set error code */
err_code = -RT_EEMPTY;
break;
}
}
}
else
{
/* polling mode */
while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
{
while (uart->uart_device->SSR & SSR_RDRF)
{
*ptr = uart->uart_device->RDR & 0xff;
ptr ++;
}
}
}
/* set error code */
rt_set_errno(err_code);
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos,
const void* buffer, rt_size_t size)
{
rt_uint8_t* ptr;
rt_err_t err_code;
struct serial_device* uart;
err_code = RT_EOK;
ptr = (rt_uint8_t*)buffer;
uart = (struct serial_device*)dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_TX)
{
/* interrupt mode Tx */
while (uart->int_tx->save_index != uart->int_tx->write_index)
{
/* save on tx buffer */
uart->int_tx->tx_buffer[uart->int_tx->save_index] = *ptr++;
-- size;
/* move to next position */
uart->int_tx->save_index ++;
/* wrap save index */
if (uart->int_tx->save_index >= UART_TX_BUFFER_SIZE)
uart->int_tx->save_index = 0;
}
/* set error code */
if (size > 0)
err_code = -RT_EFULL;
}
else
{
/* polling mode */
while (size)
{
/*
* to be polite with serial console add a line feed
* to the carriage return character
*/
if (*ptr == '\n' && (dev->flag & RT_DEVICE_FLAG_STREAM))
{
while (!(uart->uart_device->SSR & SSR_TDRE));
uart->uart_device->TDR = '\r';
}
while (!(uart->uart_device->SSR & SSR_TDRE));
uart->uart_device->TDR = (*ptr & 0x1FF);
++ptr;
--size;
}
}
/* set error code */
rt_set_errno(err_code);
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
{
RT_ASSERT(dev != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
break;
case RT_DEVICE_CTRL_RESUME:
/* resume device */
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
break;
}
return RT_EOK;
}
/*
* serial register
*/
rt_err_t rt_hw_serial_register(rt_device_t device, const char* name,
rt_uint32_t flag, struct serial_device *serial)
{
RT_ASSERT(device != RT_NULL);
device->type = RT_Device_Class_Char;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = rt_serial_init;
device->open = rt_serial_open;
device->close = rt_serial_close;
device->read = rt_serial_read;
device->write = rt_serial_write;
device->control = rt_serial_control;
device->user_data = serial;
/* register a character device */
return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}
/* ISR for serial interrupt */
void rt_hw_serial_isr(rt_device_t device)
{
struct serial_device* uart = (struct serial_device*) device->user_data;
/* interrupt mode receive */
RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);
/* save on rx buffer */
while (uart->uart_device->SSR & SSR_RDRF)
{
rt_serial_savechar(uart, uart->uart_device->RDR & 0xff);
}
/* invoke callback */
if (device->rx_indicate != RT_NULL)
{
rt_size_t rx_length;
/* get rx length */
rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?
UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :
uart->int_rx->save_index - uart->int_rx->read_index;
device->rx_indicate(device, rx_length);
}
}
#ifdef RT_USING_UART0
/* UART0 device driver structure */
#define UART0 FM4_MFS0
struct serial_int_rx uart0_int_rx;
struct serial_device uart0 =
{
UART0,
MFS0_RX_IRQn,
MFS0_TX_IRQn,
&uart0_int_rx,
RT_NULL
};
struct rt_device uart0_device;
void MFS0_RX_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_hw_serial_isr(&uart0_device);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /**< #ifdef RT_USING_UART0 */
void rt_hw_serial_init(void)
{
uint32_t APB2_clock = (SystemCoreClock >> (APBC2_PSR_Val & 0x03));
#ifdef RT_USING_UART0
// Initialize ports for MFS0
FM4_GPIO->PFR2 = 0x06u; // P21>SIN0_0, P22>SOT0_0
FM4_GPIO->EPFR07 &= 0xFFFFFF0Ful;
FM4_GPIO->EPFR07 |= 0x00000040ul;
// Initialize MFS to UART asynchronous mode
uart0.uart_device->SMR = SMR_MD_UART | SMR_SOE;;
uart0.uart_device->BGR = (APB2_clock + (BPS/2))/BPS - 1; /* round */
uart0.uart_device->ESCR = ESCR_DATABITS_8;
uart0.uart_device->SCR = SCR_RXE | SCR_TXE | SCR_RIE;
/* register UART0 device */
rt_hw_serial_register(&uart0_device,
"uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart0);
#endif /**< #ifdef RT_USING_UART0 */
}
/*@}*/
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