1 /*
2 * Copyright (c) 2015, Freescale Semiconductor, Inc.
3 * Copyright 2016-2017 NXP
4 * All rights reserved.
5 *
6 * SPDX-License-Identifier: BSD-3-Clause
7 */
8
9 #include "fsl_lpit.h"
10
11 /*******************************************************************************
12 * Variables
13 ******************************************************************************/
14
15 /*! @brief Array to map LPIT instance number to base pointer. */
16 static LPIT_Type* const s_lpitBases[] = LPIT_BASE_PTRS;
17
18 #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
19 /*! @brief Clock array name */
20 static const clock_ip_name_t s_lpitClock[] = LPIT_CLOCKS;
21
22 #if defined(LPIT_PERIPH_CLOCKS)
23 /* Array of LPIT functional clock name. */
24 static const clock_ip_name_t s_lpitPeriphClocks[] = LPIT_PERIPH_CLOCKS;
25 #endif
26
27 #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
28
29 /*******************************************************************************
30 * Prototypes
31 ******************************************************************************/
32
33 /*!
34 * @brief Get the instance for LPIT module.
35 *
36 * @param base LPIT base address
37 */
38 uint32_t LPIT_GetInstance(LPIT_Type* base);
39
40 /*******************************************************************************
41 * Code
42 ******************************************************************************/
43
LPIT_GetInstance(LPIT_Type * base)44 uint32_t LPIT_GetInstance(LPIT_Type* base)
45 {
46 uint32_t instance;
47
48 /* Find the instance index from base address mappings. */
49 for (instance = 0; instance < ARRAY_SIZE(s_lpitBases); instance++)
50 {
51 if (s_lpitBases[instance] == base)
52 {
53 break;
54 }
55 }
56
57 assert(instance < ARRAY_SIZE(s_lpitBases));
58
59 return instance;
60 }
61
LPIT_Init(LPIT_Type * base,const lpit_config_t * config)62 void LPIT_Init(LPIT_Type* base, const lpit_config_t* config)
63 {
64 assert(config);
65
66 #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
67
68 uint32_t instance = LPIT_GetInstance(base);
69
70 /* Enable the clock */
71 CLOCK_EnableClock(s_lpitClock[instance]);
72 #if defined(LPIT_PERIPH_CLOCKS)
73 CLOCK_EnableClock(s_lpitPeriphClocks[instance]);
74 #endif
75
76 #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
77
78 /* Reset the timer channels and registers except the MCR register */
79 LPIT_Reset(base);
80
81 /* Setup timer operation in debug and doze modes and enable the module */
82 base->MCR =
83 (LPIT_MCR_DBG_EN(config->enableRunInDebug) | LPIT_MCR_DOZE_EN(config->enableRunInDoze) | LPIT_MCR_M_CEN_MASK);
84 }
85
LPIT_Deinit(LPIT_Type * base)86 void LPIT_Deinit(LPIT_Type* base)
87 {
88 /* Disable the module */
89 base->MCR &= ~LPIT_MCR_M_CEN_MASK;
90 #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
91
92 uint32_t instance = LPIT_GetInstance(base);
93
94 /* Disable the clock */
95 CLOCK_DisableClock(s_lpitClock[instance]);
96 #if defined(LPIT_PERIPH_CLOCKS)
97 CLOCK_DisableClock(s_lpitPeriphClocks[instance]);
98 #endif
99
100 #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
101 }
102
LPIT_GetDefaultConfig(lpit_config_t * config)103 void LPIT_GetDefaultConfig(lpit_config_t* config)
104 {
105 assert(config);
106
107 /* Timers are stopped in debug mode */
108 config->enableRunInDebug = false;
109 /* Timers are stopped in doze mode */
110 config->enableRunInDoze = false;
111 }
112
LPIT_SetupChannel(LPIT_Type * base,lpit_chnl_t channel,const lpit_chnl_params_t * chnlSetup)113 status_t LPIT_SetupChannel(LPIT_Type* base, lpit_chnl_t channel, const lpit_chnl_params_t* chnlSetup)
114 {
115 assert(chnlSetup);
116
117 uint32_t reg = 0;
118
119 /* Cannot assert the chain bit for channel 0 */
120 if ((channel == kLPIT_Chnl_0) && (chnlSetup->chainChannel == true))
121 {
122 return kStatus_Fail;
123 }
124
125 /* Setup the channel counters operation mode, trigger operation, chain mode */
126 reg = (LPIT_TCTRL_MODE(chnlSetup->timerMode) | LPIT_TCTRL_TRG_SRC(chnlSetup->triggerSource) |
127 LPIT_TCTRL_TRG_SEL(chnlSetup->triggerSelect) | LPIT_TCTRL_TROT(chnlSetup->enableReloadOnTrigger) |
128 LPIT_TCTRL_TSOI(chnlSetup->enableStopOnTimeout) | LPIT_TCTRL_TSOT(chnlSetup->enableStartOnTrigger) |
129 LPIT_TCTRL_CHAIN(chnlSetup->chainChannel));
130
131 base->CHANNEL[channel].TCTRL = reg;
132
133 return kStatus_Success;
134 }
135
