LPCOpen Platform for LPC112X microcontrollers  112X
LPCOpen Platform for the NXP LPC112X family of Microcontrollers
timer_112x.c
Go to the documentation of this file.
1 /*
2  * @brief 16/32-bit Timer/PWM control functions
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 /* Returns clock index for a specific timer referenced by IP block address */
48 {
49  CHIP_SYSCON_CLOCK_T tmrClk;
50  if (pTMR == LPC_TIMER32_1) {
51  tmrClk = SYSCON_CLOCK_CT32B1;
52  }
53  else if (pTMR == LPC_TIMER16_0) {
54  tmrClk = SYSCON_CLOCK_CT16B0;
55  }
56  else if (pTMR == LPC_TIMER16_1) {
57  tmrClk = SYSCON_CLOCK_CT16B1;
58  }
59  else {
60  tmrClk = SYSCON_CLOCK_CT32B0;
61  }
62 
63  return tmrClk;
64 }
65 
66 /*****************************************************************************
67  * Public functions
68  ****************************************************************************/
69 
70 /* Initialize a timer */
72 {
74 }
75 
76 /* Shutdown a timer */
78 {
80 }
81 
82 /* Resets the timer terminal and prescale counts to 0 */
84 {
85  uint32_t reg;
86 
87  /* Disable timer, set terminal count to non-0 */
88  reg = pTMR->TCR;
89  pTMR->TCR = 0;
90  pTMR->TC = 1;
91 
92  /* Reset timer counter */
93  pTMR->TCR = TIMER_RESET;
94 
95  /* Wait for terminal count to clear */
96  while (pTMR->TC != 0) {}
97 
98  /* Restore timer state */
99  pTMR->TCR = reg;
100 }
101 
102 /* Sets external match control (MATn.matchnum) pin control */
103 void Chip_TIMER_ExtMatchControlSet(LPC_TIMER_T *pTMR, int8_t initial_state,
104  TIMER_PIN_MATCH_STATE_T matchState, int8_t matchnum)
105 {
106  uint32_t mask, reg;
107 
108  /* Clear bits corresponding to selected match register */
109  mask = (1 << matchnum) | (0x03 << (4 + (matchnum * 2)));
110  reg = pTMR->EMR &= ~mask;
111 
112  /* Set new configuration for selected match register */
113  pTMR->EMR = reg | (((uint32_t) initial_state) << matchnum) |
114  (((uint32_t) matchState) << (4 + (matchnum * 2)));
115 }