1 /*
2 * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <nrfx.h>
33
34 #if NRFX_CHECK(NRFX_LPCOMP_ENABLED)
35
36 #include <nrfx_lpcomp.h>
37 #include "prs/nrfx_prs.h"
38
39 #define NRFX_LOG_MODULE LPCOMP
40 #include <nrfx_log.h>
41
42 #define EVT_TO_STR(event) \
43 (event == NRF_LPCOMP_EVENT_READY ? "NRF_LPCOMP_EVENT_READY" : \
44 (event == NRF_LPCOMP_EVENT_DOWN ? "NRF_LPCOMP_EVENT_DOWN" : \
45 (event == NRF_LPCOMP_EVENT_UP ? "NRF_LPCOMP_EVENT_UP" : \
46 (event == NRF_LPCOMP_EVENT_CROSS ? "NRF_LPCOMP_EVENT_CROSS" : \
47 "UNKNOWN EVENT"))))
48
49
50 static nrfx_lpcomp_event_handler_t m_lpcomp_event_handler = NULL;
51 static nrfx_drv_state_t m_state = NRFX_DRV_STATE_UNINITIALIZED;
52
lpcomp_execute_handler(nrf_lpcomp_event_t event,uint32_t event_mask)53 static void lpcomp_execute_handler(nrf_lpcomp_event_t event, uint32_t event_mask)
54 {
55 if (nrf_lpcomp_event_check(event) && nrf_lpcomp_int_enable_check(event_mask))
56 {
57 nrf_lpcomp_event_clear(event);
58 NRFX_LOG_DEBUG("Event: %s.", EVT_TO_STR(event));
59
60 m_lpcomp_event_handler(event);
61 }
62 }
63
nrfx_lpcomp_irq_handler(void)64 void nrfx_lpcomp_irq_handler(void)
65 {
66 lpcomp_execute_handler(NRF_LPCOMP_EVENT_READY, LPCOMP_INTENSET_READY_Msk);
67 lpcomp_execute_handler(NRF_LPCOMP_EVENT_DOWN, LPCOMP_INTENSET_DOWN_Msk);
68 lpcomp_execute_handler(NRF_LPCOMP_EVENT_UP, LPCOMP_INTENSET_UP_Msk);
69 lpcomp_execute_handler(NRF_LPCOMP_EVENT_CROSS, LPCOMP_INTENSET_CROSS_Msk);
70 }
71
nrfx_lpcomp_init(nrfx_lpcomp_config_t const * p_config,nrfx_lpcomp_event_handler_t event_handler)72 nrfx_err_t nrfx_lpcomp_init(nrfx_lpcomp_config_t const * p_config,
73 nrfx_lpcomp_event_handler_t event_handler)
74 {
75 NRFX_ASSERT(p_config);
76 NRFX_ASSERT(event_handler);
77 nrfx_err_t err_code;
78
79 if (m_state != NRFX_DRV_STATE_UNINITIALIZED)
80 { // LPCOMP driver is already initialized
81 err_code = NRFX_ERROR_INVALID_STATE;
82 NRFX_LOG_WARNING("Function: %s, error code: %s.",
83 __func__,
84 NRFX_LOG_ERROR_STRING_GET(err_code));
85 return err_code;
86 }
87
88 m_lpcomp_event_handler = event_handler;
89
90 #if NRFX_CHECK(NRFX_PRS_ENABLED)
91 if (nrfx_prs_acquire(NRF_LPCOMP, nrfx_lpcomp_irq_handler) != NRFX_SUCCESS)
92 {
93 err_code = NRFX_ERROR_BUSY;
94 NRFX_LOG_WARNING("Function: %s, error code: %s.",
95 __func__,
96 NRFX_LOG_ERROR_STRING_GET(err_code));
97 return err_code;
98 }
99 #endif
100
101 nrf_lpcomp_configure(&(p_config->hal));
102
103 nrf_lpcomp_input_select(p_config->input);
104
105 switch (p_config->hal.detection)
106 {
107 case NRF_LPCOMP_DETECT_UP:
108 nrf_lpcomp_int_enable(LPCOMP_INTENSET_UP_Msk);
109 break;
110
111 case NRF_LPCOMP_DETECT_DOWN:
112 nrf_lpcomp_int_enable(LPCOMP_INTENSET_DOWN_Msk);
113 break;
114
115 case NRF_LPCOMP_DETECT_CROSS:
116 nrf_lpcomp_int_enable(LPCOMP_INTENSET_CROSS_Msk);
117 break;
118
119 default:
120 break;
121 }
122 nrf_lpcomp_shorts_enable(NRF_LPCOMP_SHORT_READY_SAMPLE_MASK);
123
124 NRFX_IRQ_PRIORITY_SET(LPCOMP_IRQn, p_config->interrupt_priority);
125 NRFX_IRQ_ENABLE(LPCOMP_IRQn);
126
127 m_state = NRFX_DRV_STATE_INITIALIZED;
128
129 err_code = NRFX_SUCCESS;
130 NRFX_LOG_INFO("Function: %s, error code: %s.", __func__, NRFX_LOG_ERROR_STRING_GET(err_code));
131 return err_code;
132 }
133
nrfx_lpcomp_uninit(void)134 void nrfx_lpcomp_uninit(void)
135 {
136 NRFX_ASSERT(m_state != NRFX_DRV_STATE_UNINITIALIZED);
137 NRFX_IRQ_DISABLE(LPCOMP_IRQn);
138 nrfx_lpcomp_disable();
139 #if NRFX_CHECK(NRFX_PRS_ENABLED)
140 nrfx_prs_release(NRF_LPCOMP);
141 #endif
142 m_state = NRFX_DRV_STATE_UNINITIALIZED;
143 m_lpcomp_event_handler = NULL;
144 NRFX_LOG_INFO("Uninitialized.");
145 }
146
nrfx_lpcomp_enable(void)147 void nrfx_lpcomp_enable(void)
148 {
149 NRFX_ASSERT(m_state == NRFX_DRV_STATE_INITIALIZED);
150 nrf_lpcomp_enable();
151 nrf_lpcomp_task_trigger(NRF_LPCOMP_TASK_START);
152 m_state = NRFX_DRV_STATE_POWERED_ON;
153 NRFX_LOG_INFO("Enabled.");
154 }
155
nrfx_lpcomp_disable(void)156 void nrfx_lpcomp_disable(void)
157 {
158 NRFX_ASSERT(m_state == NRFX_DRV_STATE_POWERED_ON);
159 nrf_lpcomp_disable();
160 nrf_lpcomp_task_trigger(NRF_LPCOMP_TASK_STOP);
161 m_state = NRFX_DRV_STATE_INITIALIZED;
162 NRFX_LOG_INFO("Disabled.");
163 }
164
165 #endif // NRFX_CHECK(NRFX_LPCOMP_ENABLED)
166