172 lines
5.3 KiB
C
172 lines
5.3 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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This file has been contributed by:
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Marcin Jokel.
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*/
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/**
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* @file LPC43xx/pal_lld.c
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* @brief LPC43xx GPIO low level driver code.
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*
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* @addtogroup PAL
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_PAL || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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static void initgpio(ioportid_t port, const lpc_gpio_setup_t *config) {
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LPC_GPIO_PORT->DIR[port] = config->dir;
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LPC_GPIO_PORT->MASK[port] = 0;
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LPC_GPIO_PORT->PIN[port] = config->data;
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief LPC43xx I/O ports configuration.
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* @details GPIO unit registers initialization.
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*
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* @param[in] config the LPC43xx ports configuration
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*
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* @notapi
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*/
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void _pal_lld_init(const PALConfig *config) {
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initgpio(GPIO0, &config->P0);
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initgpio(GPIO1, &config->P1);
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initgpio(GPIO2, &config->P2);
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initgpio(GPIO3, &config->P3);
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#if LPC_HAS_GPIO4
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initgpio(GPIO4, &config->P4);
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#endif
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initgpio(GPIO5, &config->P5);
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#if LPC_HAS_GPIO6
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initgpio(GPIO6, &config->P6);
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#endif
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#if LPC_HAS_GPIO7
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initgpio(GPIO7, &config->P7);
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#endif
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}
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/**
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* @brief Reads a group of bits.
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* @note The @ref PAL provides a default software implementation of this
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* functionality, implement this function if can optimize it by using
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* special hardware functionalities or special coding.
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*
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* @param[in] port port identifier
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* @param[in] mask group mask
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* @param[in] offset group bit offset within the port
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* @return The group logical states.
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*
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* @notapi
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*/
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uint32_t _pal_lld_readgroup(ioportid_t port,
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ioportmask_t mask,
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uint32_t offset) {
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uint32_t p;
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LPC_GPIO_PORT->MASK[port] = ~((mask) << offset);
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p = LPC_GPIO_PORT->MPIN[port];
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LPC_GPIO_PORT->MASK[port] = 0;
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return p;
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}
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/**
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* @brief Writes a group of bits.
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* @note The @ref PAL provides a default software implementation of this
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* functionality, implement this function if can optimize it by using
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* special hardware functionalities or special coding.
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*
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* @param[in] port port identifier
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* @param[in] mask group mask
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* @param[in] offset group bit offset within the port
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* @param[in] bits bits to be written. Values exceeding the group width
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* are masked.
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*
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* @notapi
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*/
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void _pal_lld_writegroup(ioportid_t port,
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ioportmask_t mask,
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uint32_t offset,
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uint32_t bits) {
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LPC_GPIO_PORT->MASK[port] = ~((mask) << offset);
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LPC_GPIO_PORT->MPIN[port] = bits;
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LPC_GPIO_PORT->MASK[port] = 0;
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}
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/**
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* @brief Pads mode setup.
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* @details This function programs a pads group belonging to the same port
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* with the specified mode.
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* @note @p PAL_MODE_UNCONNECTED is implemented as push pull output with
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* high state.
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* @note This function does not alter the @p PINSELx registers. Alternate
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* functions setup must be handled by device-specific code.
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*
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* @param[in] port the port identifier
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* @param[in] mask the group mask
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* @param[in] mode the mode
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*
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* @notapi
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*/
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void _pal_lld_setgroupmode(ioportid_t port,
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ioportmask_t mask,
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iomode_t mode) {
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switch (mode) {
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case PAL_MODE_RESET:
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case PAL_MODE_INPUT:
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LPC_GPIO_PORT->DIR[port] &= ~mask;
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break;
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case PAL_MODE_UNCONNECTED:
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palSetPort(port, PAL_WHOLE_PORT);
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case PAL_MODE_OUTPUT_PUSHPULL:
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LPC_GPIO_PORT->DIR[port] |= mask;
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break;
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}
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}
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#endif /* HAL_USE_PAL */
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/** @} */
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