blob: 8b1b3ffcc718a17d9fa2fffcfec794369f979651 (
plain)
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
|
/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
LPC43xx DAC driver - Copyright (C) 2013 Marcin Jokel
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file LPC43xx/dac_lld.h
* @brief LPC43xx DAC subsystem low level driver header.
*
* @addtogroup DAC
* @{
*/
#ifndef _DAC_LLD_H_
#define _DAC_LLD_H_
#if HAL_USE_DAC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
#define DACR_BIAS (1UL << 16)
#define DACCTRL_INT_DMA_REQ (1UL << 0)
#define DACCTRL_DBLBUF_ENA (1UL << 1)
#define DACCTRL_CNT_ENA (1UL << 2)
#define DACCTRL_DMA_ENA (1UL << 3)
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name Configuration options
* @{
*/
/**
* @brief DMA stream used for DAC CHN1 TX operations.
* @note This option is only available on platforms with enhanced DMA.
*/
#if !defined(LPC_DAC_DMA_CHANNEL) || defined(__DOXYGEN__)
#define LPC_DAC_DMA_CHANNEL DMA_CHANNEL5
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if !defined(LPC_DMA_REQUIRED)
#define LPC_DMA_REQUIRED
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Type of a structure representing an DAC driver.
*/
typedef struct DACDriver DACDriver;
/**
* @brief Type representing a DAC sample.
*/
typedef uint32_t dacsample_t;
/**
* @brief DAC notification callback type.
*
* @param[in] dacp pointer to the @p DACDriver object triggering the
* callback
*/
typedef void (*dacendcallback_t)(DACDriver *dacp, const dacsample_t * samples, size_t pos);
/**
* @brief DAC notification callback type.
*
* @param[in] dacp pointer to the @p DACDriver object triggering the
* callback
*/
typedef void (*dacerrcallback_t)(DACDriver *dacp, uint32_t flags);
/**
* @brief DAC Conversion group structure.
*/
typedef struct {
/**
* @brief Number of DAC channels.
*/
uint16_t num_channels;
/**
* @brief Operation complete callback or @p NULL.
*/
dacendcallback_t end_cb;
/**
* @brief Error handling callback or @p NULL.
*/
dacerrcallback_t error_cb;
/**
* @brief Error handling callback or @p NULL.
*/
bool circular;
} DACConversionGroup;
/**
* @brief Driver configuration structure.
*/
typedef struct {
/**
* @brief Timer frequency in Hz.
*/
uint32_t frequency;
/* End of the mandatory fields.*/
} DACConfig;
/**
* @brief Structure representing a DAC driver.
*/
struct DACDriver {
/**
* @brief Driver state.
*/
dacstate_t state;
/**
* @brief Conversion group.
*/
const DACConversionGroup *grpp;
/**
* @brief Samples buffer pointer.
*/
const dacsample_t *samples;
/**
* @brief Samples buffer size.
*/
uint16_t depth;
/**
* @brief Current configuration data.
*/
const DACConfig *config;
#if DAC_USE_WAIT || defined(__DOXYGEN__)
/**
* @brief Waiting thread.
*/
Thread *thread;
#endif /* DAC_USE_WAIT */
#if DAC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the bus.
*/
Mutex mutex;
#elif CH_USE_SEMAPHORES
Semaphore semaphore;
#endif
#endif /* DAC_USE_MUTUAL_EXCLUSION */
#if defined(DAC_DRIVER_EXT_FIELDS)
DAC_DRIVER_EXT_FIELDS
#endif
/* End of the mandatory fields.*/
/**
* @brief Half buffer indicator.
*/
bool_t half_buffer;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
extern DACDriver DACD1;
#ifdef __cplusplus
extern "C" {
#endif
void dac_lld_init(void);
void dac_lld_start(DACDriver *dacp);
void dac_lld_stop(DACDriver *dacp);
void dac_lld_start_conversion(DACDriver *dacp);
void dac_lld_stop_conversion(DACDriver *dacp);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_DAC */
#endif /* _DAC_LLD_H_ */
/** @} */
|
