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
|
/**************************************************************************
* arch/arm/src/sam3u/sam3u_lowputc.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************/
/**************************************************************************
* Included Files
**************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <arch/irq.h>
#include <arch/board/board.h>
#include "up_internal.h"
#include "up_arch.h"
#include "sam3u_internal.h"
#include "sam3u_pmc.h"
#include "sam3u_uart.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/* Configuration **********************************************************/
/* If the USART is not being used as a UART, then it really isn't enabled
* for our purposes.
*/
#ifndef CONFIG_USART0_ISUART
# undef CONFIG_SAM3U_USART0
#endif
#ifndef CONFIG_USART1_ISUART
# undef CONFIG_SAM3U_USART1
#endif
#ifndef CONFIG_USART2_ISUART
# undef CONFIG_SAM3U_USART2
#endif
#ifndef CONFIG_USART3_ISUART
# undef CONFIG_SAM3U_USART3
#endif
/* Is there a serial console? It could be on the UART, or USARTn */
#if defined(CONFIG_UART_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_UART)
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART0_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART0)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART1_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART1)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART2)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART3)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#else
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# undef HAVE_CONSOLE
#endif
/* Select USART parameters for the selected console */
#if defined(CONFIG_UART_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_UART_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_UART_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_UART_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_UART_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_UART_2STOP
# define GPIO_CONSOLE_RXD GPIO_UART_RXD
# define GPIO_CONSOLE_TXD GPIO_UART_TXD
# undef GPIO_CONSOLE_CTS
# undef GPIO_CONSOLE_RTS
#elif defined(CONFIG_USART0_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART0_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART0_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART0_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART0_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART0_2STOP
# define GPIO_CONSOLE_RXD GPIO_USART0_RXD
# define GPIO_CONSOLE_TXD GPIO_USART0_TXD
# define GPIO_CONSOLE_CTS GPIO_USART0_CTS
# define GPIO_CONSOLE_RTS GPIO_USART0_RTS
#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART1_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART1_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART1_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART1_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART1_2STOP
# define GPIO_CONSOLE_RXD GPIO_USART1_RXD
# define GPIO_CONSOLE_TXD GPIO_USART1_TXD
# define GPIO_CONSOLE_CTS GPIO_USART1_CTS
# define GPIO_CONSOLE_RTS GPIO_USART1_RTS
#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART2_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART2_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART2_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART2_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART2_2STOP
# define GPIO_CONSOLE_RXD GPIO_USART2_RXD
# define GPIO_CONSOLE_TXD GPIO_USART2_TXD
# define GPIO_CONSOLE_CTS GPIO_USART2_CTS
# define GPIO_CONSOLE_RTS GPIO_USART2_RTS
#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART3_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART3_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART3_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART3_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART3_2STOP
# define GPIO_CONSOLE_RXD GPIO_USART3_RXD
# define GPIO_CONSOLE_TXD GPIO_USART3_TXD
# define GPIO_CONSOLE_CTS GPIO_USART3_CTS
# define GPIO_CONSOLE_RTS GPIO_USART3_RTS
#else
# error "No CONFIG_U[S]ARTn_SERIAL_CONSOLE Setting"
#endif
/* Select the settings for the mode register */
#if SAM3U_CONSOLE_BITS == 5
# define MR_CHRL_VALUE USART_MR_CHRL_5BITS /* 5 bits */
#elif SAM3U_CONSOLE_BITS == 6
# define MR_CHRL_VALUE USART_MR_CHRL_6BITS /* 6 bits */
#elif SAM3U_CONSOLE_BITS == 7
# define MR_CHRL_VALUE USART_MR_CHRL_7BITS /* 7 bits */
#elif SAM3U_CONSOLE_BITS == 8
# define MR_CHRL_VALUE USART_MR_CHRL_8BITS /* 8 bits */
#elif SAM3U_CONSOLE_BITS == 9 && !defined(CONFIG_UART_SERIAL_CONSOLE)
# define MR_CHRL_VALUE USART_MR_MODE9
#else
# error "Invlaid number of bits"
#endif
#if SAM3U_CONSOLE_PARITY == 1
# define MR_PAR_VALUE UART_MR_PAR_ODD
#elif SAM3U_CONSOLE_PARITY == 2
# define MR_PAR_VALUE UART_MR_PAR_EVEN
#else
# define MR_PAR_VALUE UART_MR_PAR_NONE
#endif
#if SAM3U_CONSOLE_2STOP != 0
# define MR_NBSTOP_VALUE USART_MR_NBSTOP_2
#else
# define MR_NBSTOP_VALUE USART_MR_NBSTOP_1
#endif
#define MR_VALUE (USART_MR_MODE_NORMAL|USART_MR_USCLKS_MCK|MR_CHRL_VALUE|MR_PAR_VALUE|MR_NBSTOP_VALUE)
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowputc
*
* Description:
* Output one byte on the serial console
*
**************************************************************************/
void up_lowputc(char ch)
{
/* Wait for the transmitter to be available */
while ((getreg32(SAM3U_CONSOLE_BASE+SAM3U_UART_SR_OFFSET) & UART_INT_TXEMPTY) == 0);
/* Send the character */
putreg32((uint32_t)ch, SAM3U_CONSOLE_BASE+SAM3U_UART_THR_OFFSET);
}
/**************************************************************************
* Name: sam3u_lowsetup
*
* Description:
* This performs basic initialization of the USART used for the serial
* console. Its purpose is to get the console output availabe as soon
* as possible.
*
**************************************************************************/
void sam3u_lowsetup(void)
{
uint32_t regval;
/* Enable clocking for the selected UART/USARTs */
regval = getreg32(SAM3U_PMC_PCER);
#ifdef CONFIG_SAM3U_USART
regval |= (1 << SAM3U_PID_UART);
#endif
#ifdef CONFIG_SAM3U_USART0
regval |= (1 << SAM3U_PID_USART0);
#endif
#ifdef CONFIG_SAM3U_USART1
regval |= (1 << SAM3U_PID_USART1);
#endif
#ifdef CONFIG_SAM3U_USART2
regval |= (1 << SAM3U_PID_USART2);
#endif
#ifdef CONFIG_SAM3U_USART3
regval |= (1 << SAM3U_PID_USART3);
#endif
putreg32(regval, SAM3U_PMC_PCER);
/* Configure UART pins */
#ifdef GPIO_CONSOLE_RXD
(void)sam3u_configgpio(GPIO_CONSOLE_RXD);
#endif
#ifdef GPIO_CONSOLE_TXD
(void)sam3u_configgpio(GPIO_CONSOLE_TXD);
#endif
#ifdef GPIO_CONSOLE_CTS
(void)sam3u_configgpio(GPIO_CONSOLE_CTS);
#endif
#ifdef GPIO_CONSOLE_RTS
(void)sam3u_configgpio(GPIO_CONSOLE_RTS);
#endif
/* Configure the console (only) */
#ifdef HAVE_CONSOLE
/* Reset and disable receiver and transmitter */
putreg32((UART_CR_RSTRX|UART_CR_RSTTX|UART_CR_RXDIS|UART_CR_TXDIS),
SAM3U_CONSOLE_BASE+SAM3U_UART_CR_OFFSET);
/* Disable all interrupts */
putreg32(0xffffffff, SAM3U_CONSOLE_BASE+SAM3U_UART_IDR_OFFSET);
/* Set up the mode register */
putreg32(MR_VALUE, AM3U_CONSOLE_BASE+SAM3U_UART_MR_OFFSET);
/* Configure the console baud */
putreg32(((SAM3U_MCK_FREQUENCY + (SAM3U_CONSOLE_BAUD << 3))/(SAM3U_CONSOLE_BAUD << 4)),
SAM3U_CONSOLE_BASE+SAM3U_UART_BRGR_OFFSET);
/* Enable receiver & transmitter */
putreg32((UART_CR_RXEN|UART_CR_TXEN),
SAM3U_CONSOLE_BASE+SAM3U_UART_CR_OFFSET);
#endif
}
|
