LPCOpen Platform for LPC18XX/43XX microcontrollers: C:/w/lpcopen_docs/software/lpc_core/lpc_chip/chip_18xx_43xx/ritimer_18xx_43xx.c Source File

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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 */
51 void Chip_RIT_Init(LPC_RITIMER_T *pRITimer)
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 */
61 void Chip_RIT_DeInit(LPC_RITIMER_T *pRITimer)
62 {
63 Chip_RIT_Init(pRITimer);
64 Chip_Clock_Disable(CLK_MX_RITIMER);
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 */
80 Chip_RIT_EnableCTRL(pRITimer, RIT_CTRL_ENCLR);
81 }
82
83 /* Check whether interrupt is pending */
84 IntStatus Chip_RIT_GetIntStatus(LPC_RITIMER_T *pRITimer)
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