LPCOpen Platform for LPC18XX/43XX microcontrollers: C:/w/lpcopen_docs/software/lpc_core/lpc_chip/chip_18xx_43xx/sct_pwm_18xx_43xx.c Source File

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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;
79 Chip_SCT_SetMatchCount(pSCT, SCT_MATCH_0, 0);
80 Chip_SCT_SetMatchReload(pSCT, SCT_MATCH_0, rate);
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 */
86 Chip_SCT_Config(pSCT, SCT_CONFIG_32BIT_COUNTER | SCT_CONFIG_AUTOLIMIT_L);
87 }