1 /*
2 * Copyright (c) 2014 - 2023, Nordic Semiconductor ASA
3 * All rights reserved.
4 *
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice, this
11 * list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the copyright holder nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #ifndef NRF_ADC_H_
35 #define NRF_ADC_H_
36
37 #include <nrfx.h>
38
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 /**
44 * @defgroup nrf_adc_hal ADC HAL
45 * @{
46 * @ingroup nrf_adc
47 * @brief Hardware access layer for managing the Analog-to-Digital Converter (ADC)
48 * peripheral.
49 */
50
51 /** @brief ADC interrupts. */
52 typedef enum
53 {
54 NRF_ADC_INT_END_MASK = ADC_INTENSET_END_Msk, /**< ADC interrupt on END event. */
55 } nrf_adc_int_mask_t;
56
57 /** @brief Resolution of the analog-to-digital converter. */
58 typedef enum
59 {
60 NRF_ADC_CONFIG_RES_8BIT = ADC_CONFIG_RES_8bit, /**< 8-bit resolution. */
61 NRF_ADC_CONFIG_RES_9BIT = ADC_CONFIG_RES_9bit, /**< 9-bit resolution. */
62 NRF_ADC_CONFIG_RES_10BIT = ADC_CONFIG_RES_10bit, /**< 10-bit resolution. */
63 } nrf_adc_config_resolution_t;
64
65
66 /** @brief Scaling factor of the analog-to-digital conversion. */
67 typedef enum
68 {
69 NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE = ADC_CONFIG_INPSEL_AnalogInputNoPrescaling, /**< Full scale input. */
70 NRF_ADC_CONFIG_SCALING_INPUT_TWO_THIRDS = ADC_CONFIG_INPSEL_AnalogInputTwoThirdsPrescaling, /**< 2/3 scale input. */
71 NRF_ADC_CONFIG_SCALING_INPUT_ONE_THIRD = ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling, /**< 1/3 scale input. */
72 NRF_ADC_CONFIG_SCALING_SUPPLY_TWO_THIRDS = ADC_CONFIG_INPSEL_SupplyTwoThirdsPrescaling, /**< 2/3 of supply. */
73 NRF_ADC_CONFIG_SCALING_SUPPLY_ONE_THIRD = ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling /**< 1/3 of supply. */
74 } nrf_adc_config_scaling_t;
75
76
77 /** @brief External reference selection of the analog-to-digital converter. */
78 typedef enum
79 {
80 NRF_ADC_CONFIG_EXTREFSEL_NONE = ADC_CONFIG_EXTREFSEL_None, /**< Analog reference inputs disabled. */
81 NRF_ADC_CONFIG_EXTREFSEL_AREF0 = ADC_CONFIG_EXTREFSEL_AnalogReference0, /**< AREF0 as analog reference. */
82 NRF_ADC_CONFIG_EXTREFSEL_AREF1 = ADC_CONFIG_EXTREFSEL_AnalogReference1 /**< AREF1 as analog reference. */
83 } nrf_adc_config_extref_t;
84
85 /** @brief Reference selection of the analog-to-digital converter. */
86 typedef enum
87 {
88 NRF_ADC_CONFIG_REF_VBG = ADC_CONFIG_REFSEL_VBG, /**< 1.2 V reference. */
89 NRF_ADC_CONFIG_REF_SUPPLY_ONE_HALF = ADC_CONFIG_REFSEL_SupplyOneHalfPrescaling, /**< 1/2 of power supply. */
90 NRF_ADC_CONFIG_REF_SUPPLY_ONE_THIRD = ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling, /**< 1/3 of power supply. */
91 NRF_ADC_CONFIG_REF_EXT = ADC_CONFIG_REFSEL_External /**< External reference. See @ref nrf_adc_config_extref_t for further configuration. */
92 } nrf_adc_config_reference_t;
93
94 /** @brief Input selection of the analog-to-digital converter. */
95 typedef enum
96 {
97 NRF_ADC_CONFIG_INPUT_DISABLED = ADC_CONFIG_PSEL_Disabled, /**< No input selected. */
98 NRF_ADC_CONFIG_INPUT_0 = ADC_CONFIG_PSEL_AnalogInput0, /**< Input 0. */
99 NRF_ADC_CONFIG_INPUT_1 = ADC_CONFIG_PSEL_AnalogInput1, /**< Input 1. */
100 NRF_ADC_CONFIG_INPUT_2 = ADC_CONFIG_PSEL_AnalogInput2, /**< Input 2. */
101 NRF_ADC_CONFIG_INPUT_3 = ADC_CONFIG_PSEL_AnalogInput3, /**< Input 3. */
102 NRF_ADC_CONFIG_INPUT_4 = ADC_CONFIG_PSEL_AnalogInput4, /**< Input 4. */
103 NRF_ADC_CONFIG_INPUT_5 = ADC_CONFIG_PSEL_AnalogInput5, /**< Input 5. */
104 NRF_ADC_CONFIG_INPUT_6 = ADC_CONFIG_PSEL_AnalogInput6, /**< Input 6. */
105 NRF_ADC_CONFIG_INPUT_7 = ADC_CONFIG_PSEL_AnalogInput7, /**< Input 7. */
106 } nrf_adc_config_input_t;
107
108 /** @brief Analog-to-digital converter tasks. */
109 typedef enum
110 {
111 NRF_ADC_TASK_START = offsetof(NRF_ADC_Type, TASKS_START), /**< ADC start sampling task. */
112 NRF_ADC_TASK_STOP = offsetof(NRF_ADC_Type, TASKS_STOP) /**< ADC stop sampling task. */
113 } nrf_adc_task_t;
114
115 /** @brief Analog-to-digital converter events. */
116 typedef enum
117 {
118 NRF_ADC_EVENT_END = offsetof(NRF_ADC_Type, EVENTS_END) /**< End of a conversion event. */
119 } nrf_adc_event_t;
120
121 /** @brief Analog-to-digital converter configuration. */
122 typedef struct
123 {
124 nrf_adc_config_resolution_t resolution; /**< ADC resolution. */
125 nrf_adc_config_scaling_t scaling; /**< ADC scaling factor. */
126 nrf_adc_config_reference_t reference; /**< ADC reference. */
127 nrf_adc_config_input_t input; /**< ADC input selection. */
128 nrf_adc_config_extref_t extref; /**< ADC external reference selection. */
129 } nrf_adc_config_t;
130
131 /** @brief Analog-to-digital value type. */
132 typedef uint16_t nrf_adc_value_t;
133
134
135 /**
136 * @brief Function for activating the specified ADC task.
137 *
138 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
139 * @param[in] task Task to be activated.
140 */
141 NRF_STATIC_INLINE void nrf_adc_task_trigger(NRF_ADC_Type * p_reg, nrf_adc_task_t task);
142
143 /**
144 * @brief Function for getting the address of an ADC task register.
145 *
146 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
147 * @param[in] task ADC task.
148 *
149 * @return Address of the specified ADC task.
150 */
151 NRF_STATIC_INLINE uint32_t nrf_adc_task_address_get(NRF_ADC_Type const * p_reg,
152 nrf_adc_task_t task);
153
154 /**
155 * @brief Function for retrieving the state of an ADC event.
156 *
157 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
158 * @param[in] event Event to be checked.
159 *
160 * @retval true The event has been generated.
161 * @retval false The event has not been generated.
162 */
163 NRF_STATIC_INLINE bool nrf_adc_event_check(NRF_ADC_Type const * p_reg, nrf_adc_event_t event);
164
165 /**
166 * @brief Function for clearing an ADC event.
167 *
168 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
169 * @param[in] event Event to clear.
170 */
171 NRF_STATIC_INLINE void nrf_adc_event_clear(NRF_ADC_Type * p_reg, nrf_adc_event_t event);
172
173 /**
174 * @brief Function for getting the address of the specified ADC event register.
175 *
176 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
177 * @param[in] event ADC event.
178 *
179 * @return Address of the specified ADC event.
180 */
181 NRF_STATIC_INLINE uint32_t nrf_adc_event_address_get(NRF_ADC_Type const * p_reg,
182 nrf_adc_event_t event);
183
184 /**
185 * @brief Function for enabling the specified interrupts.
186 *
187 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
188 * @param[in] mask Mask of interrupts to be enabled.
189 * Use @ref nrf_adc_int_mask_t values for bit masking.
190 */
191 NRF_STATIC_INLINE void nrf_adc_int_enable(NRF_ADC_Type * p_reg, uint32_t mask);
192
193 /**
194 * @brief Function for disabling the specified interrupts.
195 *
196 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
197 * @param[in] mask Mask of interrupts to be disabled.
198 * Use @ref nrf_adc_int_mask_t values for bit masking.
199 */
200 NRF_STATIC_INLINE void nrf_adc_int_disable(NRF_ADC_Type * p_reg, uint32_t mask);
201
202 /**
203 * @brief Function for checking if the specified interrupts are enabled.
204 *
205 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
206 * @param[in] mask Mask of interrupts to be checked.
207 * Use @ref nrf_adc_int_mask_t values for bit masking.
208 *
209 * @return Mask of enabled interrupts.
210 */
211 NRF_STATIC_INLINE uint32_t nrf_adc_int_enable_check(NRF_ADC_Type const * p_reg, uint32_t mask);
212
213 /**
214 * @brief Function for checking whether the ADC is busy.
215 *
216 * This function checks whether the ADC converter is busy with a conversion.
217 *
218 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
219 *
220 * @retval true The ADC is busy.
221 * @retval false The ADC is not busy.
222 */
223 NRF_STATIC_INLINE bool nrf_adc_busy_check(NRF_ADC_Type const * p_reg);
224
225 /**
226 * @brief Function for enabling the ADC.
227 *
228 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
229 */
230 NRF_STATIC_INLINE void nrf_adc_enable(NRF_ADC_Type * p_reg);
231
232 /**
233 * @brief Function for disabling the ADC.
234 *
235 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
236 */
237 NRF_STATIC_INLINE void nrf_adc_disable(NRF_ADC_Type * p_reg);
238
239 /**
240 * @brief Function for checking if the ADC is enabled.
241 *
242 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
243 *
244 * @retval true The ADC is enabled.
245 * @retval false The ADC is not enabled.
246 */
247 NRF_STATIC_INLINE bool nrf_adc_enable_check(NRF_ADC_Type const * p_reg);
248
249 /**
250 * @brief Function for retrieving the ADC conversion result.
251 *
252 * This function retrieves and returns the last analog-to-digital conversion result.
253 *
254 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
255 *
256 * @return Last conversion result.
257 */
258 NRF_STATIC_INLINE nrf_adc_value_t nrf_adc_result_get(NRF_ADC_Type const * p_reg);
259
260 /**
261 * @brief Function for initializing the ADC.
262 *
263 * This function writes data to ADC's CONFIG register. After the configuration,
264 * the ADC is in DISABLE state and must be enabled before using it.
265 *
266 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
267 * @param[in] p_config Configuration parameters.
268 */
269 NRF_STATIC_INLINE void nrf_adc_init(NRF_ADC_Type * p_reg, nrf_adc_config_t const * p_config);
270
271
272 #ifndef NRF_DECLARE_ONLY
273
nrf_adc_task_trigger(NRF_ADC_Type * p_reg,nrf_adc_task_t task)274 NRF_STATIC_INLINE void nrf_adc_task_trigger(NRF_ADC_Type * p_reg, nrf_adc_task_t task)
275 {
276 *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)task)) = 0x1UL;
277 }
278
nrf_adc_task_address_get(NRF_ADC_Type const * p_reg,nrf_adc_task_t task)279 NRF_STATIC_INLINE uint32_t nrf_adc_task_address_get(NRF_ADC_Type const * p_reg,
280 nrf_adc_task_t task)
281 {
282 return nrf_task_event_address_get(p_reg, task);
283 }
284
nrf_adc_event_check(NRF_ADC_Type const * p_reg,nrf_adc_event_t event)285 NRF_STATIC_INLINE bool nrf_adc_event_check(NRF_ADC_Type const * p_reg, nrf_adc_event_t event)
286 {
287 return nrf_event_check(p_reg, event);
288 }
289
nrf_adc_event_clear(NRF_ADC_Type * p_reg,nrf_adc_event_t event)290 NRF_STATIC_INLINE void nrf_adc_event_clear(NRF_ADC_Type * p_reg, nrf_adc_event_t event)
291 {
292 *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event)) = 0x0UL;
293 }
294
nrf_adc_event_address_get(NRF_ADC_Type const * p_reg,nrf_adc_event_t event)295 NRF_STATIC_INLINE uint32_t nrf_adc_event_address_get(NRF_ADC_Type const * p_reg,
296 nrf_adc_event_t event)
297 {
298 return nrf_task_event_address_get(p_reg, event);
299 }
300
nrf_adc_int_enable(NRF_ADC_Type * p_reg,uint32_t mask)301 NRF_STATIC_INLINE void nrf_adc_int_enable(NRF_ADC_Type * p_reg, uint32_t mask)
302 {
303 p_reg->INTENSET = mask;
304 }
305
nrf_adc_int_disable(NRF_ADC_Type * p_reg,uint32_t mask)306 NRF_STATIC_INLINE void nrf_adc_int_disable(NRF_ADC_Type * p_reg, uint32_t mask)
307 {
308 p_reg->INTENCLR = mask;
309 }
310
nrf_adc_int_enable_check(NRF_ADC_Type const * p_reg,uint32_t mask)311 NRF_STATIC_INLINE uint32_t nrf_adc_int_enable_check(NRF_ADC_Type const * p_reg, uint32_t mask)
312 {
313 return p_reg->INTENSET & mask;
314 }
315
nrf_adc_busy_check(NRF_ADC_Type const * p_reg)316 NRF_STATIC_INLINE bool nrf_adc_busy_check(NRF_ADC_Type const * p_reg)
317 {
318 return ((p_reg->BUSY & ADC_BUSY_BUSY_Msk) == (ADC_BUSY_BUSY_Busy << ADC_BUSY_BUSY_Pos));
319 }
320
nrf_adc_enable(NRF_ADC_Type * p_reg)321 NRF_STATIC_INLINE void nrf_adc_enable(NRF_ADC_Type * p_reg)
322 {
323 p_reg->ENABLE = (ADC_ENABLE_ENABLE_Enabled << ADC_ENABLE_ENABLE_Pos);
324 }
325
nrf_adc_disable(NRF_ADC_Type * p_reg)326 NRF_STATIC_INLINE void nrf_adc_disable(NRF_ADC_Type * p_reg)
327 {
328 p_reg->ENABLE = (ADC_ENABLE_ENABLE_Disabled << ADC_ENABLE_ENABLE_Pos);
329 }
330
nrf_adc_enable_check(NRF_ADC_Type const * p_reg)331 NRF_STATIC_INLINE bool nrf_adc_enable_check(NRF_ADC_Type const * p_reg)
332 {
333 return (p_reg->ENABLE == (ADC_ENABLE_ENABLE_Enabled << ADC_ENABLE_ENABLE_Pos));
334 }
335
nrf_adc_result_get(NRF_ADC_Type const * p_reg)336 NRF_STATIC_INLINE nrf_adc_value_t nrf_adc_result_get(NRF_ADC_Type const * p_reg)
337 {
338 return (nrf_adc_value_t)p_reg->RESULT;
339 }
340
nrf_adc_init(NRF_ADC_Type * p_reg,nrf_adc_config_t const * p_config)341 NRF_STATIC_INLINE void nrf_adc_init(NRF_ADC_Type * p_reg, nrf_adc_config_t const * p_config)
342 {
343 p_reg->CONFIG =
344 ((p_config->resolution << ADC_CONFIG_RES_Pos) & ADC_CONFIG_RES_Msk)
345 |((p_config->scaling << ADC_CONFIG_INPSEL_Pos) & ADC_CONFIG_INPSEL_Msk)
346 |((p_config->reference << ADC_CONFIG_REFSEL_Pos) & ADC_CONFIG_REFSEL_Msk)
347 |((p_config->input << ADC_CONFIG_PSEL_Pos) & ADC_CONFIG_PSEL_Msk)
348 |((p_config->extref << ADC_CONFIG_EXTREFSEL_Pos) & ADC_CONFIG_EXTREFSEL_Msk);
349 }
350
351 #endif // NRF_DECLARE_ONLY
352
353 /** @} */
354
355 #ifdef __cplusplus
356 }
357 #endif
358
359 #endif /* NRF_ADC_H_ */
360
