LPCOpen Platform for LPC18XX/43XX microcontrollers  18XX43XX
LPCOpen Platform for the NXP LPC18XX/43XX family of Microcontrollers
timer_18xx_43xx.c
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1 /*
2  * @brief LPC18xx/43xx 16/32-bit Timer/PWM 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 /* Returns clock index for the peripheral block */
48 {
49  CHIP_CCU_CLK_T clkTMR;
50 
51  if (pTMR == LPC_TIMER3) {
52  clkTMR = CLK_MX_TIMER3;
53  }
54  else if (pTMR == LPC_TIMER2) {
55  clkTMR = CLK_MX_TIMER2;
56  }
57  else if (pTMR == LPC_TIMER1) {
58  clkTMR = CLK_MX_TIMER1;
59  }
60  else {
61  clkTMR = CLK_MX_TIMER0;
62  }
63 
64  return clkTMR;
65 }
66 
67 /*****************************************************************************
68  * Public functions
69  ****************************************************************************/
70 
71 /* Initialize a timer */
73 {
75 }
76 
77 /* Shutdown a timer */
79 {
81 }
82 
83 /* Resets the timer terminal and prescale counts to 0 */
85 {
86  uint32_t reg;
87 
88  /* Disable timer, set terminal count to non-0 */
89  reg = pTMR->TCR;
90  pTMR->TCR = 0;
91  pTMR->TC = 1;
92 
93  /* Reset timer counter */
94  pTMR->TCR = TIMER_RESET;
95 
96  /* Wait for terminal count to clear */
97  while (pTMR->TC != 0) {}
98 
99  /* Restore timer state */
100  pTMR->TCR = reg;
101 }
102 
103 /* Sets external match control (MATn.matchnum) pin control */
104 void Chip_TIMER_ExtMatchControlSet(LPC_TIMER_T *pTMR, int8_t initial_state,
105  TIMER_PIN_MATCH_STATE_T matchState, int8_t matchnum)
106 {
107  uint32_t mask, reg;
108 
109  /* Clear bits corresponding to selected match register */
110  mask = (1 << matchnum) | (0x03 << (4 + (matchnum * 2)));
111  reg = pTMR->EMR &= ~mask;
112 
113  /* Set new configuration for selected match register */
114  pTMR->EMR = reg | (((uint32_t) initial_state) << matchnum) |
115  (((uint32_t) matchState) << (4 + (matchnum * 2)));
116 }
117