2013-09-12 13:58:33 +07:00
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/**********************************************************************
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* $Id$ lpc43xx_scu.c 2011-06-02
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*//**
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* @file lpc43xx_scu.c
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* @brief Contains all functions support for SCU firmware library on lpc43xx
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* @version 1.0
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* @date 02. June. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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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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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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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<EFBFBD>
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* relevant copyright 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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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup SCU
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "LPC43xx.h" /* lpc43xx definitions */
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#include "lpc_types.h"
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#include "lpc43xx_scu.h"
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2013-09-12 14:26:20 +07:00
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/* Pin modes
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* =========
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* The EPUN and EPD bits in the SFS registers allow the selection of weak on-chip
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* pull-up or pull-down resistors with a typical value of 50 kOhm for each pin or the
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* selection of the repeater mode.
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* The possible on-chip resistor configurations are pull-up enabled, pull-down enabled, or no
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* pull-up/pull-down. The default value is pull-up enabled.
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*
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* The repeater mode enables the pull-up resistor if the pin is at a logic HIGH and enables
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* the pull-down resistor if the pin is at a logic LOW. This causes the pin to retain its last
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* known state if it is configured as an input and is not driven externally. Repeater mode may
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* typically be used to prevent a pin from floating (and potentially using significant power if it
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* floats to an indeterminate state) if it is temporarily not driven.
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* Repeater mode is enabled when both pull-up and pull-down are enabled.
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*
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* To be able to receive a digital signal, the input buffer must be enabled through bit EZI in
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* the pin configuration registers. By default, the input buffer is disabled.
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* For pads that support both a digital and an analog function, the input buffer must be
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* disabled before enabling the analog function.
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*
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* All digital pins support a programmable glitch filter (bit ZIF), which can be switched on or
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* off. By default, the glitch filter is on. The glitch filter should be disabled for
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* clocking signals with frequencies higher than 30 MHz.
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*
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* Normal-drive and high-speed pins support a programmable slew rate (bit EHS) to select
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* between lower noise and low speed or higher noise and high speed . The typical
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* frequencies supported are 50 MHz/80 MHz for normal-drive pins and 75 MHz/180 MHz for
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* high-speed pins.
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*/
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2013-09-12 13:58:33 +07:00
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/*********************************************************************//**
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* @brief Configure pin function
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* @param[in] port Port number, should be: 0..15
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2013-09-12 14:26:20 +07:00
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* @param[in] pin Pin number, should be: 0..31
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2013-09-12 13:58:33 +07:00
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* @param[in] mode Pin mode, should be:
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* - MD_PUP :Pull-up enabled
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* - MD_BUK :Plain input
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* - MD_PLN :Repeater mode
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* - MD_PDN :Pull-down enabled
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2013-09-12 14:26:20 +07:00
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* - MD_EHS :Slew rate
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* - MD_EZI :Input buffer enable
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* - MD_ZI :Glitch filter enabled
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* - MD_EHD0 :High drive 8 mA
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* - MD_EHD1 :High drive 14 mA
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* - MD_EHD2 :High drive 20 mA
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2013-09-12 13:58:33 +07:00
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* @param[in] func Function mode, should be:
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* - FUNC0 :Function 0
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* - FUNC1 :Function 1
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* - FUNC2 :Function 2
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* - FUNC3 :Function 3
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2013-09-12 14:26:20 +07:00
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* - FUNC4 :Function 4
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* - FUNC5 :Function 5
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* - FUNC6 :Function 6
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* - FUNC7 :Function 7
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2013-09-12 13:58:33 +07:00
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* @return None
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**********************************************************************/
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void scu_pinmux(uint8_t port, uint8_t pin, uint8_t mode, uint8_t func)
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{
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uint32_t * scu_base=(uint32_t*)(LPC_SCU_BASE);
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scu_base[(PORT_OFFSET*port+PIN_OFFSET*pin)/4]=mode+func;
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} /* scu_pinmux */
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/**
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* @}
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*/
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