1 /*
2 * Copyright (c) 2019 - 2020, 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_TEMP_ENABLED)
35
36 #include <nrfx_temp.h>
37
38 #if !defined(USE_WORKAROUND_FOR_TEMP_OFFSET_ANOMALY) && defined(NRF51)
39 // Enable workaround for nRF51 series anomaly 28
40 // (TEMP: Temperature offset value has to be manually loaded to the TEMP module).
41 #define USE_WORKAROUND_FOR_TEMP_OFFSET_ANOMALY 1
42 #endif
43
44 /** @brief Time of one check attempt.*/
45 #define NRFX_TEMP_TIME_US 4
46
47 /** @brief Maximum attempts to check whether conversion passed.*/
48 #define NRFX_TEMP_ATTEMPTS 10
49
50 /** @brief Internal state of TEMP driver. */
51 static nrfx_drv_state_t m_temp_state;
52
53 /** @brief Pointer to handler to be called from interrupt routine. */
54 static nrfx_temp_data_handler_t m_data_handler;
55
nrfx_temp_init(nrfx_temp_config_t const * p_config,nrfx_temp_data_handler_t handler)56 nrfx_err_t nrfx_temp_init(nrfx_temp_config_t const * p_config, nrfx_temp_data_handler_t handler)
57 {
58 NRFX_ASSERT(p_config);
59
60 if (m_temp_state != NRFX_DRV_STATE_UNINITIALIZED)
61 {
62 return NRFX_ERROR_ALREADY_INITIALIZED;
63 }
64
65 #if NRFX_CHECK(USE_WORKAROUND_FOR_TEMP_OFFSET_ANOMALY)
66 *(uint32_t volatile *)0x4000C504 = 0;
67 #endif
68
69 m_data_handler = handler;
70
71 if (m_data_handler)
72 {
73 nrf_temp_int_enable(NRF_TEMP, NRF_TEMP_INT_DATARDY_MASK);
74 NRFX_IRQ_PRIORITY_SET(TEMP_IRQn, p_config->interrupt_priority);
75 NRFX_IRQ_ENABLE(TEMP_IRQn);
76 }
77
78 m_temp_state = NRFX_DRV_STATE_INITIALIZED;
79 return NRFX_SUCCESS;
80 }
81
nrfx_temp_uninit(void)82 void nrfx_temp_uninit(void)
83 {
84 NRFX_ASSERT(m_temp_state == NRFX_DRV_STATE_INITIALIZED);
85 nrf_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_STOP);
86
87 if (m_data_handler)
88 {
89 nrf_temp_int_disable(NRF_TEMP, NRF_TEMP_INT_DATARDY_MASK);
90 NRFX_IRQ_DISABLE(TEMP_IRQn);
91 }
92
93 m_temp_state = NRFX_DRV_STATE_UNINITIALIZED;
94 }
95
nrfx_temp_calculate(int32_t raw_measurement)96 int32_t nrfx_temp_calculate(int32_t raw_measurement)
97 {
98 /* Raw temperature is a 2's complement signed value. Moreover, it is represented
99 * by 0.25[C] intervals, so division by 4 is needed. To preserve
100 * fractional part, raw value is multiplied by 100 before division.*/
101
102 return (raw_measurement * 100) / 4;
103 }
104
nrfx_temp_measure(void)105 nrfx_err_t nrfx_temp_measure(void)
106 {
107 NRFX_ASSERT(m_temp_state == NRFX_DRV_STATE_INITIALIZED);
108
109 nrfx_err_t result = NRFX_SUCCESS;
110 nrf_temp_event_clear(NRF_TEMP, NRF_TEMP_EVENT_DATARDY);
111 nrf_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_START);
112
113 if (!m_data_handler)
114 {
115 bool ev_result;
116 NRFX_WAIT_FOR(nrf_temp_event_check(NRF_TEMP, NRF_TEMP_EVENT_DATARDY),
117 NRFX_TEMP_ATTEMPTS,
118 NRFX_TEMP_TIME_US,
119 ev_result);
120 if (!ev_result)
121 {
122 result = NRFX_ERROR_INTERNAL;
123 }
124 else
125 {
126 nrf_temp_event_clear(NRF_TEMP, NRF_TEMP_EVENT_DATARDY);
127 }
128 nrf_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_STOP);
129 }
130
131 return result;
132 }
133
nrfx_temp_irq_handler(void)134 void nrfx_temp_irq_handler(void)
135 {
136 NRFX_ASSERT(m_data_handler);
137
138 nrf_temp_task_trigger(NRF_TEMP, NRF_TEMP_TASK_STOP);
139 nrf_temp_event_clear(NRF_TEMP, NRF_TEMP_EVENT_DATARDY);
140
141 uint32_t raw_temp = nrfx_temp_result_get();
142
143 m_data_handler(raw_temp);
144 }
145
146 #endif // NRFX_CHECK(NRFX_TEMP_ENABLED)
147