LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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ritimer_17xx_40xx.c
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1 /*
2  * @brief LPC17xx/40xx RITimer chip driver
3  *
4  * @note
5  * Copyright(C) NXP Semiconductors, 2012
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 #if defined(CHIP_LPC175X_6X)
35 
36 /*****************************************************************************
37  * Private types/enumerations/variables
38  ****************************************************************************/
39 
40 /*****************************************************************************
41  * Public types/enumerations/variables
42  ****************************************************************************/
43 
44 /*****************************************************************************
45  * Private functions
46  ****************************************************************************/
47 
48 /*****************************************************************************
49  * Public functions
50  ****************************************************************************/
51 
52 /* Initialize the RIT */
53 void Chip_RIT_Init(LPC_RITIMER_T *pRITimer)
54 {
55  Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_RIT);
56  IP_RIT_Init(pRITimer);
57 }
58 
59 /* DeInitialize the RIT */
60 void Chip_RIT_DeInit(LPC_RITIMER_T *pRITimer)
61 {
62  IP_RIT_DeInit(pRITimer);
63  Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_RIT);
64 }
65 
66 /* Set timer interval value */
67 void Chip_RIT_SetTimerInterval(LPC_RITIMER_T *pRITimer, uint32_t time_interval)
68 {
69  uint32_t cmp_value;
70 
71  /* Determine aapproximate compare value based on clock rate and passed interval */
72  cmp_value = (Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_RIT) / 1000) * time_interval;
73 
74  /* Set timer compare value */
75  Chip_RIT_SetCOMPVAL(pRITimer, cmp_value);
76 
77  /* Set timer enable clear bit to clear timer to 0 whenever
78  counter value equals the contents of RICOMPVAL */
79  Chip_RIT_EnableCTRL(pRITimer, RIT_CTRL_ENCLR);
80 }
81 
82 #endif /* defined(CHIP_LPC175X_6X) */