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rt-thread-official/bsp/v2m-mps2/drivers/drv_uart.c

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/*
* File : drv_uart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2018-02-22 Tanek first version.
*/
#include <rtthread.h>
#include <rthw.h>
#include <SMM_MPS2.h>
#ifdef RT_USING_UART
#ifndef RT_USING_DEVICE
#error "you must define RT_USING_DEVICE with uart device"
#endif
#ifndef RT_UART_RX_BUFFER_SIZE
#define RT_UART_RX_BUFFER_SIZE 16
#endif
/* uart driver */
struct fvp_uart
{
struct rt_device parent;
CMSDK_UART_TypeDef * uart_base;
CMSDK_GPIO_TypeDef * rx_pingpio; // Pin GPIO
CMSDK_GPIO_TypeDef * tx_pingpio;
uint8_t rx_pinnum; // Pin Number
uint8_t tx_pinnum;
IRQn_Type uart_irq_rx;
IRQn_Type uart_irq_tx;
/* 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 fvp_uart uart0_device;
#endif
#ifdef RT_USING_UART1
struct fvp_uart uart1_device;
#endif
#ifdef RT_USING_UART2
struct fvp_uart uart2_device;
#endif
#ifdef RT_USING_UART3
struct fvp_uart uart3_device;
#endif
static void uart_irq_handler(struct fvp_uart* uart)
{
rt_ubase_t level;
uint32_t status;
uint8_t data;
status = uart->uart_base->INTSTATUS;
data = uart->uart_base->DATA;
/* enter interrupt */
rt_interrupt_enter();
level = rt_hw_interrupt_disable();
uart->rx_buffer[uart->save_index] = data;
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);
}
uart->uart_base->INTCLEAR = status;
/* leave interrupt */
rt_interrupt_leave();
}
#ifdef RT_USING_UART0
void UART0RX_Handler(void)
{
uart_irq_handler(&uart0_device);
}
#endif
#ifdef RT_USING_UART1
void UART1RX_Handler(void)
{
uart_irq_handler(&uart1_device);
}
#endif
#ifdef RT_USING_UART2
void UART2RX_Handler(void)
{
uart_irq_handler(&uart2_device);
}
#endif
#ifdef RT_USING_UART3
void UART3RX_Handler(void)
{
uart_irq_handler(&uart3_device);
}
#endif
static rt_err_t rt_uart_init (rt_device_t dev)
{
struct fvp_uart* uart;
RT_ASSERT(dev != RT_NULL);
uart = (struct fvp_uart *)dev;
uart->rx_pingpio->ALTFUNCSET |= (1u << uart->rx_pinnum);
uart->tx_pingpio->ALTFUNCSET |= (1u << uart->tx_pinnum);
uart->uart_base->CTRL = CMSDK_UART_CTRL_TXEN_Msk | CMSDK_UART_CTRL_RXEN_Msk | CMSDK_UART_CTRL_RXIRQEN_Msk;
uart->uart_base->BAUDDIV = SystemCoreClock / 115200;
return RT_EOK;
}
static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
{
struct fvp_uart* uart;
RT_ASSERT(dev != RT_NULL);
uart = (struct fvp_uart *)dev;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* Enable the UART Interrupt */
NVIC_EnableIRQ(uart->uart_irq_rx);
}
return RT_EOK;
}
static rt_err_t rt_uart_close(rt_device_t dev)
{
struct fvp_uart* uart;
RT_ASSERT(dev != RT_NULL);
uart = (struct fvp_uart *)dev;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* Disable the UART Interrupt */
NVIC_DisableIRQ(uart->uart_irq_rx);
}
return RT_EOK;
}
static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
struct fvp_uart* uart = (struct fvp_uart *)dev;
rt_uint8_t *ptr;
rt_size_t length;
RT_ASSERT(dev != RT_NULL);
RT_ASSERT(buffer != RT_NULL);
ptr = (rt_uint8_t *) buffer;
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 --;
}
length = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
return length;
}
static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
char *ptr = (char*) buffer;
struct fvp_uart* uart = (struct fvp_uart *)dev;
RT_ASSERT(dev != RT_NULL);
RT_ASSERT(buffer != RT_NULL);
if (dev->open_flag & RT_DEVICE_FLAG_STREAM)
{
/* stream mode */
while (size)
{
if (*ptr == '\n')
{
while (uart->uart_base->STATE & CMSDK_UART_STATE_TXBF_Msk);
uart->uart_base->DATA = '\r';
}
while (uart->uart_base->STATE & CMSDK_UART_STATE_TXBF_Msk);
uart->uart_base->DATA = *ptr;
ptr++;
size--;
}
}
else
{
while (size)
{
while (uart->uart_base->STATE & CMSDK_UART_STATE_TXBF_Msk);
uart->uart_base->DATA = *ptr;
ptr++;
size--;
}
}
return (rt_size_t)ptr - (rt_size_t)buffer;
}
int rt_hw_usart_init(void)
{
#ifdef RT_USING_UART0
{
struct fvp_uart* uart;
/* get uart device */
uart = &uart0_device;
/* device initialization */
uart->parent.type = RT_Device_Class_Char;
uart->uart_base = CMSDK_UART0;
uart->uart_irq_rx = UART0RX_IRQn;
uart->read_index = 0;
uart->save_index = 0;
rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
/* 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_INT_RX);
}
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART1
{
struct fvp_uart* uart;
/* get uart device */
uart = &uart1_device;
/* device initialization */
uart->parent.type = RT_Device_Class_Char;
uart->uart_base = CMSDK_UART1;
uart->uart_irq_rx = UART1RX_IRQn;
uart->read_index = 0;
uart->save_index = 0;
rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
/* 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_INT_RX);
}
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
{
struct fvp_uart* uart;
/* get uart device */
uart = &uart2_device;
/* device initialization */
uart->uart_base = CMSDK_UART2;
uart->uart_irq_rx = UART2RX_IRQn;
uart->read_index = 0;
uart->save_index = 0;
rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
/* device interface */
uart->parent.type = RT_Device_Class_Char;
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, "uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
}
#endif /* RT_USING_UART2 */
return 0;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);
#endif /*RT_USING_UART*/
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