1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
|
/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-07-23 tyustli first version
* 2020-04-02 hqfang modified for Nuclei
*/
#include <drv_usart.h>
#ifdef RT_USING_SERIAL
#if !defined(BSP_USING_UART0) && !defined(BSP_USING_UART1) && !defined(BSP_USING_UART2) \
&& !defined(BSP_USING_UART3) && !defined(BSP_USING_UART4)
#error "Please define at least one BSP_USING_UARTx"
/* this driver can be disabled at menuconfig -> Hardware Drivers Config -> On-chip Peripheral Drivers -> Enable UART */
#endif
enum
{
#ifdef BSP_USING_UART0
GDUART0_INDEX,
#endif
#ifdef BSP_USING_UART1
GDUART1_INDEX,
#endif
#ifdef BSP_USING_UART2
GDUART2_INDEX,
#endif
#ifdef BSP_USING_UART3
GDUART3_INDEX,
#endif
#ifdef BSP_USING_UART4
GDUART4_INDEX,
#endif
};
static struct gd32_uart_config uart_config[] =
{
#ifdef BSP_USING_UART0
{
"uart0",
USART0,
USART0_IRQn,
},
#endif
#ifdef BSP_USING_UART1
{
"uart1",
USART1,
USART1_IRQn,
},
#endif
#ifdef BSP_USING_UART2
{
"uart2",
USART2,
USART2_IRQn,
},
#endif
#ifdef BSP_USING_UART3
{
"uart3",
UART3,
UART3_IRQn,
},
#endif
#ifdef BSP_USING_UART4
{
"uart4",
UART4,
UART4_IRQn,
},
#endif
};
static struct gd32_uart uart_obj[sizeof(uart_config) / sizeof(uart_config[0])] = {0};
static rt_err_t gd32_configure(struct rt_serial_device *serial,
struct serial_configure *cfg)
{
struct gd32_uart *usart_obj;
struct gd32_uart_config *usart;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
usart_obj = (struct gd32_uart *) serial->parent.user_data;
usart = usart_obj->config;
RT_ASSERT(usart != RT_NULL);
usart_deinit(usart->uart_base);
usart_baudrate_set(usart->uart_base, cfg->baud_rate);
switch (cfg->data_bits)
{
case DATA_BITS_8:
usart_word_length_set(usart->uart_base, USART_WL_8BIT);
break;
case DATA_BITS_9:
usart_word_length_set(usart->uart_base, USART_WL_9BIT);
break;
default:
usart_word_length_set(usart->uart_base, USART_WL_8BIT);
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_1:
usart_stop_bit_set(usart->uart_base, USART_STB_1BIT);
break;
case STOP_BITS_2:
usart_stop_bit_set(usart->uart_base, USART_STB_2BIT);
break;
default:
usart_stop_bit_set(usart->uart_base, USART_STB_1BIT);
break;
}
switch (cfg->parity)
{
case PARITY_NONE:
usart_parity_config(usart->uart_base, USART_PM_NONE);
break;
case PARITY_ODD:
usart_parity_config(usart->uart_base, USART_PM_ODD);
break;
case PARITY_EVEN:
usart_parity_config(usart->uart_base, USART_PM_EVEN);
break;
default:
usart_parity_config(usart->uart_base, USART_PM_NONE);
break;
}
usart_hardware_flow_rts_config(usart->uart_base, USART_RTS_DISABLE);
usart_hardware_flow_cts_config(usart->uart_base, USART_CTS_DISABLE);
usart_receive_config(usart->uart_base, USART_RECEIVE_ENABLE);
usart_transmit_config(usart->uart_base, USART_TRANSMIT_ENABLE);
usart_enable(usart->uart_base);
return RT_EOK;
}
static rt_err_t gd32_control(struct rt_serial_device *serial, int cmd,
void *arg)
{
struct gd32_uart *usart_obj;
struct gd32_uart_config *usart;
RT_ASSERT(serial != RT_NULL);
usart_obj = (struct gd32_uart *) serial->parent.user_data;
usart = usart_obj->config;
RT_ASSERT(usart != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
ECLIC_DisableIRQ(usart->irqn);
usart_interrupt_disable(usart->uart_base, USART_INT_RBNE);
break;
case RT_DEVICE_CTRL_SET_INT:
ECLIC_EnableIRQ(usart->irqn);
/* enable USART0 receive interrupt */
usart_interrupt_enable(usart->uart_base, USART_INT_RBNE);
break;
}
return RT_EOK;
}
static int gd32_putc(struct rt_serial_device *serial, char ch)
{
struct gd32_uart *usart_obj;
struct gd32_uart_config *usart;
RT_ASSERT(serial != RT_NULL);
usart_obj = (struct gd32_uart *) serial->parent.user_data;
usart = usart_obj->config;
RT_ASSERT(usart != RT_NULL);
usart_data_transmit(usart->uart_base, (uint8_t) ch);
while (usart_flag_get(usart->uart_base, USART_FLAG_TBE) == RESET);
return 1;
}
static int gd32_getc(struct rt_serial_device *serial)
{
int ch;
struct gd32_uart *usart_obj;
struct gd32_uart_config *usart;
RT_ASSERT(serial != RT_NULL);
usart_obj = (struct gd32_uart *) serial->parent.user_data;
usart = usart_obj->config;
RT_ASSERT(usart != RT_NULL);
ch = -1;
if (RESET != usart_flag_get(usart->uart_base, USART_FLAG_RBNE))
{
ch = usart_data_receive(usart->uart_base) & 0xff;
}
return ch;
}
static const struct rt_uart_ops gd32_uart_ops = { gd32_configure, gd32_control,
gd32_putc, gd32_getc,
RT_NULL
};
static void usart_isr(struct rt_serial_device *serial)
{
struct gd32_uart *usart_obj;
struct gd32_uart_config *usart;
RT_ASSERT(serial != RT_NULL);
usart_obj = (struct gd32_uart *) serial->parent.user_data;
usart = usart_obj->config;
RT_ASSERT(usart != RT_NULL);
if ((usart_interrupt_flag_get(usart->uart_base, USART_INT_FLAG_RBNE)
!= RESET)
&& (RESET != usart_flag_get(usart->uart_base, USART_FLAG_RBNE)))
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
usart_interrupt_flag_clear(usart->uart_base, USART_INT_FLAG_RBNE);
usart_flag_clear(usart->uart_base, USART_FLAG_RBNE);
}
else
{
if (usart_flag_get(usart->uart_base, USART_FLAG_CTSF) != RESET)
{
usart_flag_clear(usart->uart_base, USART_FLAG_CTSF);
}
if (usart_flag_get(usart->uart_base, USART_FLAG_LBDF) != RESET)
{
usart_flag_clear(usart->uart_base, USART_FLAG_LBDF);
}
if (usart_flag_get(usart->uart_base, USART_FLAG_TC) != RESET)
{
usart_flag_clear(usart->uart_base, USART_FLAG_TC);
}
}
}
#ifdef BSP_USING_UART0
void USART0_IRQHandler(void)
{
rt_interrupt_enter();
usart_isr(&uart_obj[GDUART0_INDEX].serial);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART1
void USART1_IRQHandler(void)
{
rt_interrupt_enter();
usart_isr(&uart_obj[GDUART1_INDEX].serial);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART2
void USART2_IRQHandler(void)
{
rt_interrupt_enter();
usart_isr(&uart_obj[GDUART2_INDEX].serial);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART3
void UART3_IRQHandler(void)
{
rt_interrupt_enter();
usart_isr(&uart_obj[GDUART3_INDEX].serial);
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART4
void UART4_IRQHandler(void)
{
rt_interrupt_enter();
usart_isr(&uart_obj[GDUART4_INDEX].serial);
rt_interrupt_leave();
}
#endif
int rt_hw_usart_init(void)
{
rt_size_t obj_num;
int index;
#ifdef BSP_USING_UART0
rcu_periph_clock_enable(RCU_USART0);
#endif
#ifdef BSP_USING_UART1
rcu_periph_clock_enable(RCU_USART1);
#endif
#ifdef BSP_USING_UART2
rcu_periph_clock_enable(RCU_USART2);
#endif
#ifdef BSP_USING_UART3
rcu_periph_clock_enable(RCU_UART3);
#endif
#ifdef BSP_USING_UART4
rcu_periph_clock_enable(RCU_UART4);
#endif
obj_num = sizeof(uart_obj) / sizeof(struct gd32_uart);
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
rt_err_t result = 0;
for (index = 0; index < obj_num; index++)
{
/* init UART object */
uart_obj[index].config = &uart_config[index];
uart_obj[index].serial.ops = &gd32_uart_ops;
uart_obj[index].serial.config = config;
/* register UART device */
result = rt_hw_serial_register(&uart_obj[index].serial,
uart_obj[index].config->name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX
| RT_DEVICE_FLAG_INT_TX, &uart_obj[index]);
RT_ASSERT(result == RT_EOK);
}
return result;
}
#endif /* RT_USING_SERIAL */
/******************** end of file *******************/
|
