1 /*
2 * @brief LPC15xx RITimer driver
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2013
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "chip.h"
33
34 /*****************************************************************************
35 * Private types/enumerations/variables
36 ****************************************************************************/
37
38 /*****************************************************************************
39 * Public types/enumerations/variables
40 ****************************************************************************/
41
42 /*****************************************************************************
43 * Private functions
44 ****************************************************************************/
45
46 /*****************************************************************************
47 * Public functions
48 ****************************************************************************/
49
50 /* Initialize the RIT */
Chip_RIT_Init(LPC_RITIMER_T * pRITimer)51 void Chip_RIT_Init(LPC_RITIMER_T *pRITimer)
52 {
53 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_RIT);
54 Chip_SYSCTL_PeriphReset(RESET_RIT);
55 pRITimer->CTRL = 0x04;
56 }
57
58 /* DeInitialize the RIT */
Chip_RIT_DeInit(LPC_RITIMER_T * pRITimer)59 void Chip_RIT_DeInit(LPC_RITIMER_T *pRITimer)
60 {
61 pRITimer->CTRL = 0x00;
62 Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_RIT);
63 }
64
65 /* Safely sets CTRL register bits */
Chip_RIT_SetCTRL(LPC_RITIMER_T * pRITimer,uint32_t val)66 void Chip_RIT_SetCTRL(LPC_RITIMER_T *pRITimer, uint32_t val)
67 {
68 uint32_t reg;
69
70 reg = pRITimer->CTRL & 0xF;
71 pRITimer->CTRL = reg | val;
72 }
73
74 /* Safely clears CTRL register bits */
Chip_RIT_ClearCTRL(LPC_RITIMER_T * pRITimer,uint32_t val)75 void Chip_RIT_ClearCTRL(LPC_RITIMER_T *pRITimer, uint32_t val)
76 {
77 uint32_t reg;
78
79 reg = pRITimer->CTRL & 0xF;
80 pRITimer->CTRL = reg & ~val;
81 }
82
83 /* Set a tick value for the interrupt to time out */
Chip_RIT_SetCompareValue(LPC_RITIMER_T * pRITimer,uint64_t val)84 void Chip_RIT_SetCompareValue(LPC_RITIMER_T *pRITimer, uint64_t val)
85 {
86 pRITimer->COMPVAL = (uint32_t) val;
87 pRITimer->COMPVAL_H = (uint32_t) (val >> 32);
88 }
89
90 /* Returns the current timer compare value */
Chip_RIT_GetCompareValue(LPC_RITIMER_T * pRITimer)91 uint64_t Chip_RIT_GetCompareValue(LPC_RITIMER_T *pRITimer)
92 {
93 uint64_t val;
94
95 val = (uint64_t) pRITimer->COMPVAL_H;
96 val = val << 32;
97 val |= (uint64_t) pRITimer->COMPVAL;
98
99 return val;
100 }
101
102 /* Sets a mask value used for bit based compare */
Chip_RIT_SetMaskValue(LPC_RITIMER_T * pRITimer,uint64_t mask)103 void Chip_RIT_SetMaskValue(LPC_RITIMER_T *pRITimer, uint64_t mask)
104 {
105 pRITimer->MASK = (uint32_t) mask;
106 pRITimer->MASK_H = (uint32_t) (mask >> 32);
107 }
108
109 /* Returns the mask value used for bit based compare */
Chip_RIT_GetMaskValue(LPC_RITIMER_T * pRITimer)110 uint64_t Chip_RIT_GetMaskValue(LPC_RITIMER_T *pRITimer)
111 {
112 uint64_t val;
113
114 val = (uint64_t) pRITimer->MASK_H;
115 val = val << 32;
116 val |= (uint64_t) pRITimer->MASK;
117
118 return val;
119 }
120
121 /* Sets the current timer Counter value */
Chip_RIT_SetCounter(LPC_RITIMER_T * pRITimer,uint64_t count)122 void Chip_RIT_SetCounter(LPC_RITIMER_T *pRITimer, uint64_t count)
123 {
124 pRITimer->COUNTER = (uint32_t) count;
125 pRITimer->COUNTER_H = (uint32_t) (count >> 32);
126 }
127
128 /* Returns the current timer Counter value */
Chip_RIT_GetCounter(LPC_RITIMER_T * pRITimer)129 uint64_t Chip_RIT_GetCounter(LPC_RITIMER_T *pRITimer)
130 {
131 uint64_t val;
132
133 val = (uint64_t) pRITimer->COUNTER_H;
134 val = val << 32;
135 val |= (uint64_t) pRITimer->COUNTER;
136
137 return val;
138 }
139
140 /* Set timer interval value in Hz (frequency) */
Chip_RIT_SetTimerIntervalHz(LPC_RITIMER_T * pRITimer,uint32_t freq)141 void Chip_RIT_SetTimerIntervalHz(LPC_RITIMER_T *pRITimer, uint32_t freq)
142 {
143 uint64_t cmp_value;
144
145 /* Determine approximate compare value based on clock rate and passed interval */
146 cmp_value = (uint64_t) Chip_Clock_GetSystemClockRate();
147 cmp_value = cmp_value / (uint64_t) freq;
148
149 /* Set timer compare value and periodic mode */
150 Chip_RIT_SetCompareValue(pRITimer, cmp_value);
151 Chip_RIT_EnableCompClear(pRITimer);
152 }
153