3  * This file is part of RT-Thread RTOS
4  * COPYRIGHT (C) 2010, RT-Thread Development Team
8  * http://www.rt-thread.org/license/LICENSE
12  * 2009-02-05     Bernard      first version
13  * 2009-10-25     Bernard      fix rt_serial_read bug when there is no data
15  * 2010-03-29     Bernard      cleanup code.
16  * 2010-03-30     Kyle         Ported from STM32 to AVR32.
36 /* RT-Thread Device Interface */
37 static rt_err_t rt_serial_init (rt_device_t dev)  in rt_serial_init()  argument
39 	struct avr32_serial_device* uart = (struct avr32_serial_device*) dev->user_data;  in rt_serial_init()
41 	if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))  in rt_serial_init()
43 		if (dev->flag & RT_DEVICE_FLAG_INT_RX)  in rt_serial_init()
45 			rt_memset(uart->int_rx->rx_buffer, 0, sizeof(uart->int_rx->rx_buffer));  in rt_serial_init()
46 			uart->int_rx->read_index = 0;  in rt_serial_init()
47 			uart->int_rx->save_index = 0;  in rt_serial_init()
50 		dev->flag |= RT_DEVICE_FLAG_ACTIVATED;  in rt_serial_init()
56 static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)  in rt_serial_open()  argument
61 static rt_err_t rt_serial_close(rt_device_t dev)  in rt_serial_close()  argument
66 static rt_size_t rt_serial_read (rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)  in rt_serial_read()  argument
74 	uart = (struct avr32_serial_device*)dev->user_data;  in rt_serial_read()
76 	if (dev->flag & RT_DEVICE_FLAG_INT_RX)  in rt_serial_read()
86 			if (uart->int_rx->read_index != uart->int_rx->save_index)  in rt_serial_read()
89 				*ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];  in rt_serial_read()
90 				size--;  in rt_serial_read()
93 				uart->int_rx->read_index ++;  in rt_serial_read()
94 				if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)  in rt_serial_read()
95 					uart->int_rx->read_index = 0;  in rt_serial_read()
100 				err_code = -RT_EEMPTY;  in rt_serial_read()
114 		while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)  in rt_serial_read()
116 			while (usart_test_hit(uart->uart_device))  in rt_serial_read()
118 				*ptr = uart->uart_device->rhr & 0xff;  in rt_serial_read()
126 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;  in rt_serial_read()
129 static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)  in rt_serial_write()  argument
137 	uart = (struct avr32_serial_device*)dev->user_data;  in rt_serial_write()
139 	if (dev->flag & RT_DEVICE_FLAG_INT_TX)  in rt_serial_write()
142 		RT_ASSERT(0);  in rt_serial_write()
147 		if (dev->flag & RT_DEVICE_FLAG_STREAM)  in rt_serial_write()
152 				usart_putchar(uart->uart_device, (int) *ptr);  in rt_serial_write()
154 				++ptr; --size;  in rt_serial_write()
162 				usart_bw_write_char(uart->uart_device, (int) *ptr);  in rt_serial_write()
164 				++ptr; --size;  in rt_serial_write()
172 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;  in rt_serial_write()
175 static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)  in rt_serial_control()  argument
179 	RT_ASSERT(dev != RT_NULL);  in rt_serial_control()
181 	uart = (struct avr32_serial_device*)dev->user_data;  in rt_serial_control()
186 		dev->flag |= RT_DEVICE_FLAG_SUSPENDED;  in rt_serial_control()
191 		dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;  in rt_serial_control()
209 		RT_ASSERT(0);  in rt_hw_serial_register()
212 	device->type 		= RT_Device_Class_Char;  in rt_hw_serial_register()
213 	device->rx_indicate = RT_NULL;  in rt_hw_serial_register()
214 	device->tx_complete = RT_NULL;  in rt_hw_serial_register()
215 	device->init 		= rt_serial_init;  in rt_hw_serial_register()
216 	device->open		= rt_serial_open;  in rt_hw_serial_register()
217 	device->close		= rt_serial_close;  in rt_hw_serial_register()
218 	device->read 		= rt_serial_read;  in rt_hw_serial_register()
219 	device->write 		= rt_serial_write;  in rt_hw_serial_register()
220 	device->control 	= rt_serial_control;  in rt_hw_serial_register()
221 	device->user_data	= serial;  in rt_hw_serial_register()
233 	if (usart_test_hit(uart->uart_device))  in rt_hw_serial_isr()
236 		RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);  in rt_hw_serial_isr()
242 		uart->int_rx->rx_buffer[uart->int_rx->save_index] = uart->uart_device->rhr & 0xff;  in rt_hw_serial_isr()
243 		uart->int_rx->save_index ++;  in rt_hw_serial_isr()
244 		if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)  in rt_hw_serial_isr()
245 			uart->int_rx->save_index = 0;  in rt_hw_serial_isr()
248 		if (uart->int_rx->save_index == uart->int_rx->read_index)  in rt_hw_serial_isr()
250 			uart->int_rx->read_index ++;  in rt_hw_serial_isr()
251 			if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)  in rt_hw_serial_isr()
252 				uart->int_rx->read_index = 0;  in rt_hw_serial_isr()
264 			rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?  in rt_hw_serial_isr()
265 				UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :  in rt_hw_serial_isr()
266 				uart->int_rx->save_index - uart->int_rx->read_index;  in rt_hw_serial_isr()
273 		usart_reset_status(uart->uart_device);  in rt_hw_serial_isr()