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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 FM3 MB9B610
- */
- /*@{*/
- /* 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, int 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 FM3_MFS0_UART
- struct serial_int_rx uart0_int_rx;
- struct serial_device uart0 =
- {
- UART0,
- MFS0RX_IRQn,
- MFS0TX_IRQn,
- &uart0_int_rx,
- RT_NULL
- };
- struct rt_device uart0_device;
- void MFS0RX_IRQHandler(void)
- {
- /* enter interrupt */
- rt_interrupt_enter();
- rt_hw_serial_isr(&uart0_device);
- /* leave interrupt */
- rt_interrupt_leave();
- }
- #endif /**< #ifdef RT_USING_UART0 */
- #ifdef RT_USING_UART2
- /* UART2 device driver structure */
- #define UART2 FM3_MFS2_UART
- struct serial_int_rx uart2_int_rx;
- struct serial_device uart2 =
- {
- UART2,
- MFS2RX_IRQn,
- MFS2TX_IRQn,
- &uart2_int_rx,
- RT_NULL
- };
- struct rt_device uart2_device;
- void MFS2RX_IRQHandler(void)
- {
- /* enter interrupt */
- rt_interrupt_enter();
- rt_hw_serial_isr(&uart2_device);
- /* leave interrupt */
- rt_interrupt_leave();
- }
- #endif /**< #ifdef RT_USING_UART2 */
- #ifdef RT_USING_UART4
- /* UART4 device driver structure */
- #define UART4 FM3_MFS4_UART
- struct serial_int_rx uart4_int_rx;
- struct serial_device uart4 =
- {
- (FM3_MFS03_UART_TypeDef*)UART4,
- MFS4RX_IRQn,
- MFS4TX_IRQn,
- &uart4_int_rx,
- RT_NULL
- };
- struct rt_device uart4_device;
- void MFS4RX_IRQHandler(void)
- {
- /* enter interrupt */
- rt_interrupt_enter();
- rt_hw_serial_isr(&uart4_device);
- /* leave interrupt */
- rt_interrupt_leave();
- }
- #endif /**< #ifdef RT_USING_UART4 */
- void rt_hw_serial_init(void)
- {
- uint32_t APB2_clock = (SystemCoreClock >> (APBC2_PSR_Val & 0x03));
- #ifdef RT_USING_UART0
- /* initialize UART0 */
- /* Set Uart Ch0 Port, SIN0_0:P21, SOT0_0:P22 */
- FM3_GPIO->ADE &= ~(1UL<<31); /* disable P22 AN31 function */
- FM3_GPIO->PFR2 = FM3_GPIO->PFR2 | (1<<1) | (1<<2);
- FM3_GPIO->EPFR07 = FM3_GPIO->EPFR07 & ~(3<<4 | 3<<6) | (1<<4) | (1<<6);
- 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 */
- #ifdef RT_USING_UART2
- /* initialize UART2 */
- /* Set Uart Ch2 Port, SIN2_2:P17, SOT2_2:P18 */
- FM3_GPIO->ADE &= ~(1<<7 | 1<<8); /* disable P17 AN07 and P18 AN08 function */
- FM3_GPIO->PFR1 = FM3_GPIO->PFR1 | (1<<7) | (1<<8) ;
- FM3_GPIO->EPFR07 = FM3_GPIO->EPFR07 | (3<<16) | (3<<18) ;
- uart2.uart_device->SMR = SMR_MD_UART | SMR_SOE;;
- uart2.uart_device->BGR = (APB2_clock + (BPS/2))/BPS - 1; /* round */
- uart2.uart_device->ESCR = ESCR_DATABITS_8;
- uart2.uart_device->SCR = SCR_RXE | SCR_TXE | SCR_RIE;
- /* register UART2 device */
- rt_hw_serial_register(&uart2_device,
- "uart2",
- RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
- &uart2);
- #endif /**< #ifdef RT_USING_UART2 */
- #ifdef RT_USING_UART4
- /* initialize UART4 */
- /* Set Uart Ch4 Port, SIN4_2:P05, SOT4_2:P06 */
- FM3_GPIO->PFR0 = FM3_GPIO->PFR0 | (1<<5) | (1<<6);
- FM3_GPIO->EPFR08 = FM3_GPIO->EPFR08 | (3<<4) | (3<<6);
- uart4.uart_device->SMR = SMR_MD_UART | SMR_SOE;;
- uart4.uart_device->BGR = (APB2_clock + (BPS/2))/BPS - 1; /* round */
- uart4.uart_device->ESCR = ESCR_DATABITS_8;
- uart4.uart_device->SCR = SCR_RXE | SCR_TXE | SCR_RIE;
- /* register UART4 device */
- rt_hw_serial_register(&uart4_device,
- "uart4",
- RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
- &uart4);
- #endif /**< #ifdef RT_USING_UART4 */
- }
- /*@}*/
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