1 /*
2 * Copyright (c) 2019 - 2025, 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 #include <nrfx.h>
35
36 #if NRFX_CHECK(NRFX_TEMP_ENABLED)
37
38 #include <nrfx_temp.h>
39
40 #if !defined(USE_WORKAROUND_FOR_TEMP_OFFSET_ANOMALY) && defined(NRF51)
41 // Enable workaround for nRF51 series anomaly 28
42 // (TEMP: Temperature offset value has to be manually loaded to the TEMP module).
43 #define USE_WORKAROUND_FOR_TEMP_OFFSET_ANOMALY 1
44 #endif
45
46 /** @brief Time of one check attempt.*/
47 #define NRFX_TEMP_TIME_US 4
48
49 /** @brief Maximum attempts to check whether conversion passed.*/
50 #define NRFX_TEMP_ATTEMPTS 100
51
52 /** @brief Internal state of TEMP driver. */
53 static nrfx_drv_state_t m_temp_state = NRFX_DRV_STATE_UNINITIALIZED;
54
55 /** @brief Pointer to handler to be called from interrupt routine. */
56 static nrfx_temp_data_handler_t m_data_handler;
57
nrfx_temp_init(nrfx_temp_config_t const * p_config,nrfx_temp_data_handler_t handler)58 nrfx_err_t nrfx_temp_init(nrfx_temp_config_t const * p_config, nrfx_temp_data_handler_t handler)
59 {
60 NRFX_ASSERT(p_config);
61
62 if (m_temp_state != NRFX_DRV_STATE_UNINITIALIZED)
63 {
64 return NRFX_ERROR_ALREADY;
65 }
66
67 #if NRFX_CHECK(USE_WORKAROUND_FOR_TEMP_OFFSET_ANOMALY)
68 *(uint32_t volatile *)0x4000C504 = 0;
69 #endif
70
71 #if NRFY_TEMP_HAS_CALIBRATION && defined(FICR_TRIM_GLOBAL_TEMP_CALIB_VALUE_Msk)
72 nrfy_temp_calibration_coeff_set(NRF_TEMP, NRF_FICR->TRIM.GLOBAL.TEMP.CALIB);
73 #endif
74
75 m_data_handler = handler;
76
77 if (m_data_handler)
78 {
79 nrfy_temp_int_init(NRF_TEMP, 0, p_config->interrupt_priority, true);
80 }
81
82 m_temp_state = NRFX_DRV_STATE_INITIALIZED;
83 return NRFX_SUCCESS;
84 }
85
nrfx_temp_uninit(void)86 void nrfx_temp_uninit(void)
87 {
88 NRFX_ASSERT(m_temp_state == NRFX_DRV_STATE_INITIALIZED);
89
90 nrfy_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_STOP);
91 if (m_data_handler)
92 {
93 nrfy_temp_int_disable(NRF_TEMP, NRF_TEMP_INT_DATARDY_MASK);
94 nrfy_temp_int_uninit(NRF_TEMP);
95 }
96
97 m_temp_state = NRFX_DRV_STATE_UNINITIALIZED;
98 }
99
nrfx_temp_init_check(void)100 bool nrfx_temp_init_check(void)
101 {
102 return (m_temp_state != NRFX_DRV_STATE_UNINITIALIZED);
103 }
104
nrfx_temp_calculate(int32_t raw_measurement)105 int32_t nrfx_temp_calculate(int32_t raw_measurement)
106 {
107 /* Raw temperature is a 2's complement signed value. Moreover, it is represented
108 * by 0.25[C] intervals, so division by 4 is needed. To preserve
109 * fractional part, raw value is multiplied by 100 before division.*/
110
111 return (raw_measurement * 100) / 4;
112 }
113
nrfx_temp_measure(void)114 nrfx_err_t nrfx_temp_measure(void)
115 {
116 NRFX_ASSERT(m_temp_state == NRFX_DRV_STATE_INITIALIZED);
117
118 nrfx_err_t result = NRFX_SUCCESS;
119
120 nrfy_temp_event_clear(NRF_TEMP, NRF_TEMP_EVENT_DATARDY);
121 nrfy_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_START);
122
123 if (!m_data_handler)
124 {
125 bool ev_result;
126 NRFX_WAIT_FOR(nrfy_temp_event_check(NRF_TEMP, NRF_TEMP_EVENT_DATARDY),
127 NRFX_TEMP_ATTEMPTS,
128 NRFX_TEMP_TIME_US,
129 ev_result);
130 if (!ev_result)
131 {
132 result = NRFX_ERROR_INTERNAL;
133 }
134 else
135 {
136 nrfy_temp_event_clear(NRF_TEMP, NRF_TEMP_EVENT_DATARDY);
137 }
138 nrfy_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_STOP);
139 }
140
141 return result;
142 }
143
nrfx_temp_irq_handler(void)144 void nrfx_temp_irq_handler(void)
145 {
146 NRFX_ASSERT(m_data_handler);
147
148 nrf_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_STOP);
149 nrf_temp_event_clear(NRF_TEMP, NRF_TEMP_EVENT_DATARDY);
150
151 int32_t raw_temp = nrfx_temp_result_get();
152 m_data_handler(raw_temp);
153 }
154
155 #endif // NRFX_CHECK(NRFX_TEMP_ENABLED)
156
