LPCOpen Platform for LPC18XX/43XX microcontrollers
18XX43XX
LPCOpen Platform for the NXP LPC18XX/43XX family of Microcontrollers
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chip_18xx_43xx
sct_pwm_18xx_43xx.c
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/*
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* @brief LPC18xx_43xx State Configurable Timer PWM driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2013
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "
chip.h
"
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Setup the OUTPUT pin corresponding to the PWM index */
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void
Chip_SCTPWM_SetOutPin
(
LPC_SCT_T
*pSCT, uint8_t index, uint8_t pin)
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{
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int
ix = (int) index;
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pSCT->
EVENT
[ix].
CTRL
= index | (1 << 12);
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pSCT->
EVENT
[ix].
STATE
= 1;
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pSCT->
OUT
[pin].
SET
= 1;
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pSCT->
OUT
[pin].
CLR
= 1 << ix;
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/* Clear the output in-case of conflict */
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pSCT->
RES
= (pSCT->
RES
& ~(3 << (pin << 1))) | (0x01 << (pin << 1));
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/* Set and Clear do not depend on direction */
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pSCT->
OUTPUTDIRCTRL
= (pSCT->
OUTPUTDIRCTRL
& ~(3 << (pin << 1)));
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}
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/* Set the PWM frequency */
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void
Chip_SCTPWM_SetRate
(
LPC_SCT_T
*pSCT, uint32_t freq)
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{
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uint32_t rate;
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rate =
Chip_Clock_GetRate
(
CLK_MX_SCT
) / freq;;
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/* Stop the SCT before configuration */
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Chip_SCTPWM_Stop
(pSCT);
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/* Set MATCH0 for max limit */
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pSCT->
REGMODE_L
= 0;
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pSCT->
REGMODE_H
= 0;
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Chip_SCT_SetMatchCount
(pSCT,
SCT_MATCH_0
, 0);
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Chip_SCT_SetMatchReload
(pSCT,
SCT_MATCH_0
, rate);
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pSCT->
EVENT
[0].
CTRL
= 1 << 12;
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pSCT->
EVENT
[0].
STATE
= 1;
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pSCT->
LIMIT_L
= 1;
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/* Set SCT Counter to count 32-bits and reset to 0 after reaching MATCH0 */
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Chip_SCT_Config
(pSCT,
SCT_CONFIG_32BIT_COUNTER
|
SCT_CONFIG_AUTOLIMIT_L
);
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}
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