LPCOpen Platform for LPC18XX/43XX microcontrollers  18XX43XX
LPCOpen Platform for the NXP LPC18XX/43XX family of Microcontrollers
ritimer_18xx_43xx.c
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1 /*
2  * @brief LPC18xx/43xx 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 /*****************************************************************************
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 */
52 {
53  Chip_Clock_EnableOpts(CLK_MX_RITIMER, true, true, 1);
54  pRITimer->COMPVAL = 0xFFFFFFFF;
55  pRITimer->MASK = 0x00000000;
56  pRITimer->CTRL = 0x0C;
57  pRITimer->COUNTER = 0x00000000;
58 }
59 
60 /* DeInitialize the RIT */
62 {
63  Chip_RIT_Init(pRITimer);
65 }
66 
67 /* Set timer interval value */
68 void Chip_RIT_SetTimerInterval(LPC_RITIMER_T *pRITimer, uint32_t time_interval)
69 {
70  uint32_t cmp_value;
71 
72  /* Determine aapproximate compare value based on clock rate and passed interval */
73  cmp_value = (Chip_Clock_GetRate(CLK_MX_RITIMER) / 1000) * time_interval;
74 
75  /* Set timer compare value */
76  Chip_RIT_SetCOMPVAL(pRITimer, cmp_value);
77 
78  /* Set timer enable clear bit to clear timer to 0 whenever
79  counter value equals the contents of RICOMPVAL */
81 }
82 
83 /* Check whether interrupt is pending */
85 {
86  uint8_t result;
87 
88  if ((pRITimer->CTRL & RIT_CTRL_INT) == 1) {
89  result = SET;
90  }
91  else {
92  return RESET;
93  }
94 
95  return (IntStatus) result;
96 }
97