LPCOpen Platform for LPC18XX/43XX microcontrollers  18XX43XX
LPCOpen Platform for the NXP LPC18XX/43XX family of Microcontrollers
sct_pwm_18xx_43xx.c
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1 /*
2  * @brief LPC18xx_43xx State Configurable Timer PWM driver
3  *
4  * @note
5  * Copyright(C) NXP Semiconductors, 2013
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 /* Setup the OUTPUT pin corresponding to the PWM index */
51 void Chip_SCTPWM_SetOutPin(LPC_SCT_T *pSCT, uint8_t index, uint8_t pin)
52 {
53  int ix = (int) index;
54  pSCT->EVENT[ix].CTRL = index | (1 << 12);
55  pSCT->EVENT[ix].STATE = 1;
56  pSCT->OUT[pin].SET = 1;
57  pSCT->OUT[pin].CLR = 1 << ix;
58 
59  /* Clear the output in-case of conflict */
60  pSCT->RES = (pSCT->RES & ~(3 << (pin << 1))) | (0x01 << (pin << 1));
61 
62  /* Set and Clear do not depend on direction */
63  pSCT->OUTPUTDIRCTRL = (pSCT->OUTPUTDIRCTRL & ~(3 << (pin << 1)));
64 }
65 
66 /* Set the PWM frequency */
67 void Chip_SCTPWM_SetRate(LPC_SCT_T *pSCT, uint32_t freq)
68 {
69  uint32_t rate;
70 
71  rate = Chip_Clock_GetRate(CLK_MX_SCT) / freq;;
72 
73  /* Stop the SCT before configuration */
74  Chip_SCTPWM_Stop(pSCT);
75 
76  /* Set MATCH0 for max limit */
77  pSCT->REGMODE_L = 0;
78  pSCT->REGMODE_H = 0;
81  pSCT->EVENT[0].CTRL = 1 << 12;
82  pSCT->EVENT[0].STATE = 1;
83  pSCT->LIMIT_L = 1;
84 
85  /* Set SCT Counter to count 32-bits and reset to 0 after reaching MATCH0 */
87 }