143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
/****************************************************************************
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* arch/arm/src/lpc43xx/lpc43_pinconfig.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <arch/board/board.h>
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include <errno.h>
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#include "arm_internal.h"
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#include "lpc43_pinconfig.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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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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/****************************************************************************
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* Name: lpc43_pin_config
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*
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* Description:
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* Configure a pin based on bit-encoded description of the pin.
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*
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* Input Parameters:
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* 20-bit encoded value describing the pin.
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*
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* Returned Value:
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* OK on success; A negated errno value on failure.
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*
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****************************************************************************/
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int lpc43_pin_config(uint32_t pinconf)
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{
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unsigned int pinset = ((pinconf & PINCONF_PINS_MASK) >>
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PINCONF_PINS_SHIFT);
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unsigned int pin = ((pinconf & PINCONF_PIN_MASK) >>
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PINCONF_PIN_SHIFT);
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unsigned int func = ((pinconf & PINCONF_FUNC_MASK) >>
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PINCONF_FUNC_SHIFT);
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uintptr_t regaddr;
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uint32_t regval;
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/* Set up common pin configurations */
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regval = (func << SCU_PIN_MODE_SHIFT);
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/* Enable/disable pull-down resistor */
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if (PINCONF_IS_PULLDOWN(pinconf))
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{
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regval |= SCU_PIN_EPD; /* Set bit to enable */
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}
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if (!PINCONF_IS_PULLUP(pinconf))
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{
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regval |= SCU_PIN_EPUN; /* Set bit to disable */
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}
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/* Enable/disable input buffering */
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if (PINCONF_INBUFFER_ENABLED(pinconf))
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{
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regval |= SCU_PIN_EZI; /* Set bit to enable */
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}
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/* Enable/disable glitch filtering */
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if (!PINCONF_GLITCH_ENABLE(pinconf))
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{
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regval |= SCU_PIN_ZIF; /* Set bit to disable */
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}
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/* Only normal and high speed pins support the slew rate setting */
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if (PINCONF_IS_SLEW_FAST(pinconf))
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{
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regval |= SCU_NDPIN_EHS; /* 0=slow; 1=fast */
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}
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/* Only high drive pins suppose drive strength */
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switch (pinconf & PINCONF_DRIVE_MASK)
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{
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default:
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case PINCONF_DRIVE_NORMAL: /* Normal-drive: 4 mA drive strength (or not high drive pin) */
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regval |= SCU_HDPIN_EHD_NORMAL;
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break;
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case PINCONF_DRIVE_MEDIUM: /* Medium-drive: 8 mA drive strength */
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regval |= SCU_HDPIN_EHD_MEDIUM;
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break;
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case PINCONF_DRIVE_HIGH: /* High-drive: 14 mA drive strength */
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regval |= SCU_HDPIN_EHD_HIGH;
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break;
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case PINCONF_DRIVE_ULTRA: /* Ultra high-drive: 20 mA drive strength */
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regval |= SCU_HDPIN_EHD_ULTRA;
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break;
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}
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/* Get the address of the pin configuration register and save the new
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* pin configuration.
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*/
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regaddr = LPC43_SCU_SFSP(pinset, pin);
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putreg32(regval, regaddr);
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return OK;
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}
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