2  * Copyright (c) 2006-2018, RT-Thread Development Team
4  * SPDX-License-Identifier: Apache-2.0
8  * 2006-03-13     Bernard      first version
9  * 2009-04-20     yi.qiu      modified according bernard's stm32 version
10  * 2010-10-6      wangmeng    added sep4020 surpport     	  	
21 /* RT-Thread Device Interface */
25 static rt_err_t rt_serial_init (rt_device_t dev)  in rt_serial_init()  argument
27 	struct serial_device* uart = (struct serial_device*) dev->user_data;  in rt_serial_init()
29 	if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))  in rt_serial_init()
32 		if (dev->flag & RT_DEVICE_FLAG_INT_RX)  in rt_serial_init()
34 			rt_memset(uart->int_rx->rx_buffer, 0,   in rt_serial_init()
35 				sizeof(uart->int_rx->rx_buffer));  in rt_serial_init()
36 			uart->int_rx->read_index = uart->int_rx->save_index = 0;  in rt_serial_init()
39 		if (dev->flag & RT_DEVICE_FLAG_INT_TX)  in rt_serial_init()
41 			rt_memset(uart->int_tx->tx_buffer, 0,   in rt_serial_init()
42 				sizeof(uart->int_tx->tx_buffer));  in rt_serial_init()
43 			uart->int_tx->write_index = uart->int_tx->save_index = 0;  in rt_serial_init()
46 		dev->flag |= RT_DEVICE_FLAG_ACTIVATED;  in rt_serial_init()
60 	uart->int_rx->rx_buffer[uart->int_rx->save_index] = ch;  in rt_serial_savechar()
61 	uart->int_rx->save_index ++;  in rt_serial_savechar()
62 	if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)  in rt_serial_savechar()
63 		uart->int_rx->save_index = 0;  in rt_serial_savechar()
66 	if (uart->int_rx->save_index == uart->int_rx->read_index)  in rt_serial_savechar()
68 		uart->int_rx->read_index ++;  in rt_serial_savechar()
69 		if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)  in rt_serial_savechar()
70 			uart->int_rx->read_index = 0;  in rt_serial_savechar()
77 static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)  in rt_serial_open()  argument
79 	RT_ASSERT(dev != RT_NULL);	  in rt_serial_open()
83 static rt_err_t rt_serial_close(rt_device_t dev)  in rt_serial_close()  argument
85 	RT_ASSERT(dev != RT_NULL);	  in rt_serial_close()
89 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
97 	uart = (struct serial_device*)dev->user_data;  in rt_serial_read()
99 	if (dev->flag & RT_DEVICE_FLAG_INT_RX)  in rt_serial_read()
106 			if (uart->int_rx->read_index != uart->int_rx->save_index)  in rt_serial_read()
108 				*ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];  in rt_serial_read()
109 				size --;  in rt_serial_read()
114 				uart->int_rx->read_index ++;  in rt_serial_read()
115 				if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)  in rt_serial_read()
116 					uart->int_rx->read_index = 0;  in rt_serial_read()
124 				err_code = -RT_EEMPTY;  in rt_serial_read()
132 		while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)  in rt_serial_read()
134 			while (uart->uart_device->lsr & USTAT_RCV_READY)  in rt_serial_read()
136 				*ptr = uart->uart_device->dlbl_fifo.txfifo & 0xff;  in rt_serial_read()
144 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;	  in rt_serial_read()
147 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
155 	uart = (struct serial_device*)dev->user_data;  in rt_serial_write()
157 	if (dev->flag & RT_DEVICE_FLAG_INT_TX)  in rt_serial_write()
160 		while (uart->int_tx->save_index != uart->int_tx->write_index)  in rt_serial_write()
163 			uart->int_tx->tx_buffer[uart->int_tx->save_index] = *ptr++;  in rt_serial_write()
165 			-- size;  in rt_serial_write()
168 			uart->int_tx->save_index ++;  in rt_serial_write()
171 			if (uart->int_tx->save_index >= UART_TX_BUFFER_SIZE)  in rt_serial_write()
172 				uart->int_tx->save_index = 0;  in rt_serial_write()
176 		if (size > 0)  in rt_serial_write()
177 			err_code = -RT_EFULL;  in rt_serial_write()
188 			if (*ptr == '\n' && (dev->flag & RT_DEVICE_FLAG_STREAM))  in rt_serial_write()
190 				while (!(uart->uart_device->lsr & USTAT_TXB_EMPTY));  in rt_serial_write()
191 				uart->uart_device->dlbl_fifo.txfifo = '\r';  in rt_serial_write()
194 			while (!(uart->uart_device->lsr & USTAT_TXB_EMPTY));  in rt_serial_write()
195 			uart->uart_device->dlbl_fifo.txfifo = (*ptr & 0x1FF);  in rt_serial_write()
197 			++ptr; --size;  in rt_serial_write()
204 	return (rt_uint32_t)ptr - (rt_uint32_t)buffer;  in rt_serial_write()
207 static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)  in rt_serial_control()  argument
209 	RT_ASSERT(dev != RT_NULL);  in rt_serial_control()
215 		dev->flag |= RT_DEVICE_FLAG_SUSPENDED;  in rt_serial_control()
220 		dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;  in rt_serial_control()
234 	device->type 		= RT_Device_Class_Char;  in rt_hw_serial_register()
235 	device->rx_indicate = RT_NULL;  in rt_hw_serial_register()
236 	device->tx_complete = RT_NULL;  in rt_hw_serial_register()
237 	device->init 		= rt_serial_init;  in rt_hw_serial_register()
238 	device->open		= rt_serial_open;  in rt_hw_serial_register()
239 	device->close		= rt_serial_close;  in rt_hw_serial_register()
240 	device->read 		= rt_serial_read;  in rt_hw_serial_register()
241 	device->write 		= rt_serial_write;  in rt_hw_serial_register()
242 	device->control 	= rt_serial_control;  in rt_hw_serial_register()
243 	device->user_data   = serial;  in rt_hw_serial_register()
252 	struct serial_device* uart = (struct serial_device*) device->user_data;  in rt_hw_serial_isr()
255 	RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);  in rt_hw_serial_isr()
258 	while (uart->uart_device->lsr & USTAT_RCV_READY)  in rt_hw_serial_isr()
260 		rt_serial_savechar(uart, uart->uart_device->dlbl_fifo.rxfifo & 0xff);  in rt_hw_serial_isr()
264 	if (device->rx_indicate != RT_NULL)  in rt_hw_serial_isr()
269 		rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?  in rt_hw_serial_isr()
270 			UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :  in rt_hw_serial_isr()
271 			uart->int_rx->save_index - uart->int_rx->read_index;  in rt_hw_serial_isr()
273 		device->rx_indicate(device, rx_length);  in rt_hw_serial_isr()