1 /*
2 * Copyright (c) 2006-2021, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2020-12-10 thread-liu first version
9 */
10
11 #include <board.h>
12
13 #if defined(BSP_UART3_RX_USING_DMA) || defined(BSP_USING_UART3)
14
15 #include <rtthread.h>
16
17 #define SAMPLE_UART_NAME "uart3" /* serial device name */
18
19 struct rx_msg
20 {
21 rt_device_t dev;
22 rt_size_t size;
23 };
24 static rt_device_t serial;
25 static struct rt_messagequeue rx_mq;
26
uart_input(rt_device_t dev,rt_size_t size)27 static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
28 {
29 struct rx_msg msg;
30 rt_err_t result;
31 msg.dev = dev;
32 msg.size = size;
33
34 result = rt_mq_send(&rx_mq, &msg, sizeof(msg));
35 if ( result == -RT_EFULL)
36 {
37 rt_kprintf("message queue full!\n");
38 }
39 return result;
40 }
41
serial_thread_entry(void * parameter)42 static void serial_thread_entry(void *parameter)
43 {
44 struct rx_msg msg;
45 rt_err_t result;
46 rt_uint32_t rx_length;
47 static char rx_buffer[RT_SERIAL_RB_BUFSZ + 1];
48
49 while (1)
50 {
51 rt_memset(&msg, 0, sizeof(msg));
52 result = rt_mq_recv(&rx_mq, &msg, sizeof(msg), RT_WAITING_FOREVER);
53 if (result >= 0)
54 {
55 rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);
56 rx_buffer[rx_length] = '\0';
57 rt_device_write(serial, 0, rx_buffer, rx_length);
58 }
59 }
60 }
61
uart_dma_sample(int argc,char * argv[])62 static int uart_dma_sample(int argc, char *argv[])
63 {
64 rt_err_t ret = RT_EOK;
65 char uart_name[RT_NAME_MAX];
66 static char msg_pool[256];
67 char str[] = "hello RT-Thread!\r\n";
68
69 if (argc == 2)
70 {
71 rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
72 }
73 else
74 {
75 rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX);
76 }
77
78 serial = rt_device_find(uart_name);
79 if (!serial)
80 {
81 rt_kprintf("find %s failed!\n", uart_name);
82 return -RT_ERROR;
83 }
84
85 rt_mq_init(&rx_mq, "rx_mq",
86 msg_pool,
87 sizeof(struct rx_msg),
88 sizeof(msg_pool),
89 RT_IPC_FLAG_FIFO);
90
91 ret = rt_device_open(serial, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_DMA_RX);
92 if (ret != RT_EOK)
93 {
94 rt_kprintf("serial device open fail!.\n");
95 return -RT_ERROR;
96 }
97
98 ret = rt_device_set_rx_indicate(serial, uart_input);
99 if (ret != RT_EOK)
100 {
101 rt_kprintf("set rx indicate fail!.\n");
102 return -RT_ERROR;
103 }
104
105 rt_device_write(serial, 0, str, (sizeof(str) - 1));
106
107 rt_thread_t thread = rt_thread_create("serial", serial_thread_entry, RT_NULL, 1024, 25, 10);
108 if (thread != RT_NULL)
109 {
110 rt_thread_startup(thread);
111 }
112 else
113 {
114 ret = -RT_ERROR;
115 }
116
117 return ret;
118 }
119 MSH_CMD_EXPORT(uart_dma_sample, uart device dma sample);
120
121 #endif /* BSP_USING_DMA */
122