86 lines
3.3 KiB
C
86 lines
3.3 KiB
C
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/*
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* @brief LPC8xx State Configurable Timer 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->EV[ix].CTRL = index | (1 << 12);
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pSCT->EV[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))|SCT_OUTPUTDIRCTRL_RESERVED));
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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_GetSystemClockRate() / 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_U = 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->EV[0].CTRL = 1 << 12;
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pSCT->EV[0].STATE = 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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