1 /*
2 * Copyright (c) 2015, Freescale Semiconductor, Inc.
3 * Copyright 2016-2017, 2020 NXP
4 * All rights reserved.
5 *
6 * SPDX-License-Identifier: BSD-3-Clause
7 */
8
9 #include "fsl_ewm.h"
10
11 /* Component ID definition, used by tools. */
12 #ifndef FSL_COMPONENT_ID
13 #define FSL_COMPONENT_ID "platform.drivers.ewm"
14 #endif
15
16 /*******************************************************************************
17 * Code
18 ******************************************************************************/
19
20 /*!
21 * brief Initializes the EWM peripheral.
22 *
23 * This function is used to initialize the EWM. After calling, the EWM
24 * runs immediately according to the configuration.
25 * Note that, except for the interrupt enable control bit, other control bits and registers are write once after a
26 * CPU reset. Modifying them more than once generates a bus transfer error.
27 *
28 * This is an example.
29 * code
30 * ewm_config_t config;
31 * EWM_GetDefaultConfig(&config);
32 * config.compareHighValue = 0xAAU;
33 * EWM_Init(ewm_base,&config);
34 * endcode
35 *
36 * param base EWM peripheral base address
37 * param config The configuration of the EWM
38 */
EWM_Init(EWM_Type * base,const ewm_config_t * config)39 void EWM_Init(EWM_Type *base, const ewm_config_t *config)
40 {
41 assert(NULL != config);
42
43 uint8_t value = 0U;
44
45 #if !((defined(FSL_FEATURE_SOC_PCC_COUNT) && FSL_FEATURE_SOC_PCC_COUNT) && \
46 (defined(FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE) && FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE))
47 #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
48 CLOCK_EnableClock(kCLOCK_Ewm0);
49 #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
50 #endif
51 value = EWM_CTRL_EWMEN(config->enableEwm) | EWM_CTRL_ASSIN(config->setInputAssertLogic) |
52 EWM_CTRL_INEN(config->enableEwmInput) | EWM_CTRL_INTEN(config->enableInterrupt);
53 #if defined(FSL_FEATURE_EWM_HAS_PRESCALER) && FSL_FEATURE_EWM_HAS_PRESCALER
54 base->CLKPRESCALER = config->prescaler;
55 #endif /* FSL_FEATURE_EWM_HAS_PRESCALER */
56
57 #if defined(FSL_FEATURE_EWM_HAS_CLOCK_SELECT) && FSL_FEATURE_EWM_HAS_CLOCK_SELECT
58 base->CLKCTRL = (uint8_t)config->clockSource;
59 #endif /* FSL_FEATURE_EWM_HAS_CLOCK_SELECT*/
60
61 base->CMPL = config->compareLowValue;
62 base->CMPH = config->compareHighValue;
63 base->CTRL = value;
64 }
65
66 /*!
67 * brief Deinitializes the EWM peripheral.
68 *
69 * This function is used to shut down the EWM.
70 *
71 * param base EWM peripheral base address
72 */
EWM_Deinit(EWM_Type * base)73 void EWM_Deinit(EWM_Type *base)
74 {
75 EWM_DisableInterrupts(base, (uint32_t)kEWM_InterruptEnable);
76 #if !((defined(FSL_FEATURE_SOC_PCC_COUNT) && FSL_FEATURE_SOC_PCC_COUNT) && \
77 (defined(FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE) && FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE))
78 #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
79 CLOCK_DisableClock(kCLOCK_Ewm0);
80 #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
81 #endif /* FSL_FEATURE_PCC_SUPPORT_EWM_CLOCK_REMOVE */
82 }
83
84 /*!
85 * brief Initializes the EWM configuration structure.
86 *
87 * This function initializes the EWM configuration structure to default values. The default
88 * values are as follows.
89 * code
90 * ewmConfig->enableEwm = true;
91 * ewmConfig->enableEwmInput = false;
92 * ewmConfig->setInputAssertLogic = false;
93 * ewmConfig->enableInterrupt = false;
94 * ewmConfig->ewm_lpo_clock_source_t = kEWM_LpoClockSource0;
95 * ewmConfig->prescaler = 0;
96 * ewmConfig->compareLowValue = 0;
97 * ewmConfig->compareHighValue = 0xFEU;
98 * endcode
99 *
100 * param config Pointer to the EWM configuration structure.
101 * see ewm_config_t
102 */
EWM_GetDefaultConfig(ewm_config_t * config)103 void EWM_GetDefaultConfig(ewm_config_t *config)
104 {
105 assert(NULL != config);
106
107 /* Initializes the configure structure to zero. */
108 (void)memset(config, 0, sizeof(*config));
109
110 config->enableEwm = true;
111 config->enableEwmInput = false;
112 config->setInputAssertLogic = false;
113 config->enableInterrupt = false;
114 #if defined(FSL_FEATURE_EWM_HAS_CLOCK_SELECT) && FSL_FEATURE_EWM_HAS_CLOCK_SELECT
115 config->clockSource = kEWM_LpoClockSource0;
116 #endif /* FSL_FEATURE_EWM_HAS_CLOCK_SELECT*/
117 #if defined(FSL_FEATURE_EWM_HAS_PRESCALER) && FSL_FEATURE_EWM_HAS_PRESCALER
118 config->prescaler = 0U;
119 #endif /* FSL_FEATURE_EWM_HAS_PRESCALER */
120 config->compareLowValue = 0U;
121 config->compareHighValue = 0xFEU;
122 }
123
124 /*!
125 * brief Services the EWM.
126 *
127 * This function resets the EWM counter to zero.
128 *
129 * param base EWM peripheral base address
130 */
EWM_Refresh(EWM_Type * base)131 void EWM_Refresh(EWM_Type *base)
132 {
133 uint32_t primaskValue = 0U;
134
135 /* Disable the global interrupt to protect refresh sequence */
136 primaskValue = DisableGlobalIRQ();
137 base->SERV = (uint8_t)0xB4U;
138 base->SERV = (uint8_t)0x2CU;
139 EnableGlobalIRQ(primaskValue);
140 }
141
