/* ****************************************************************************** * By : parai * email:parai@foxmail.com * 这并不是一个真的串口设备,只是为了能够让内核打印信息而创建 ****************************************************************************** */ #include "rtthread.h" #define _DEBUG_SERIAL 0 #include "serial.h" #include <stdio.h> struct rt_device serial_device; extern struct serial_int_rx serial_rx; /*@{*/ /* RT-Thread Device Interface */ /** * This function initializes serial */ static rt_err_t rt_serial_init (rt_device_t dev) { if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED)) { if (dev->flag & RT_DEVICE_FLAG_INT_RX) { rt_memset(serial_rx.rx_buffer, 0, sizeof(serial_rx.rx_buffer)); serial_rx.read_index = 0; serial_rx.save_index = 0; } dev->flag |= RT_DEVICE_FLAG_ACTIVATED; } return RT_EOK; } static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag){ #if _DEBUG_SERIAL==1 printf("in rt_serial_open()\n"); #endif return RT_EOK; } static rt_err_t rt_serial_close(rt_device_t dev) { #if _DEBUG_SERIAL==1 printf("in rt_serial_close()\n"); #endif 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; ptr = buffer; err_code = RT_EOK; if (dev->flag & RT_DEVICE_FLAG_INT_RX) { /* interrupt mode Rx */ while (size) { rt_base_t level; /* disable interrupt */ level = rt_hw_interrupt_disable(); if (serial_rx.read_index != serial_rx.save_index) { /* read a character */ *ptr++ = serial_rx.rx_buffer[serial_rx.read_index]; size--; /* move to next position */ serial_rx.read_index ++; if (serial_rx.read_index >= SERIAL_RX_BUFFER_SIZE) serial_rx.read_index = 0; } else { /* set error code */ err_code = -RT_EEMPTY; /* enable interrupt */ rt_hw_interrupt_enable(level); break; } /* enable interrupt */ rt_hw_interrupt_enable(level); } } /* 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) { #if _DEBUG_SERIAL==1 printf("in rt_serial_write()\n"); #endif printf("%s",(char*)buffer); return size; } 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 */ static rt_err_t rt_hw_serial_register(rt_device_t device, const char* name, rt_uint32_t flag) { RT_ASSERT(device != RT_NULL); #if _DEBUG_SERIAL==1 printf("in rt_serial_register()\n"); #endif 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 = RT_NULL; /* register a character device */ return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag); } rt_err_t rt_hw_serial_init(void) { return rt_hw_serial_register(&serial_device,"sci0", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM); }