194 lines
6.7 KiB
C
194 lines
6.7 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file STM32/pal_lld.c
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* @brief STM32 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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#if STM32_HAS_GPIOG
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#define APB2_EN_MASK (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | \
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RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN | \
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RCC_APB2ENR_IOPEEN | RCC_APB2ENR_IOPFEN | \
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RCC_APB2ENR_IOPGEN | RCC_APB2ENR_AFIOEN)
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#elif STM32_HAS_GPIOE
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#define APB2_EN_MASK (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | \
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RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN | \
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RCC_APB2ENR_IOPEEN | RCC_APB2ENR_AFIOEN)
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#else
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#define APB2_EN_MASK (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | \
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RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN | \
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RCC_APB2ENR_AFIOEN)
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#endif
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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. */
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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(GPIO_TypeDef *gpiop, const stm32_gpio_setup_t *config) {
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gpiop->MODER = config->moder;
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gpiop->OTYPER = config->otyper;
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gpiop->OSPEEDR = config->ospeedr;
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gpiop->PUPDR = config->pupdr;
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gpiop->ODR = config->odr;
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gpiop->AFRL = 0;
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gpiop->AFRH = 0;
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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 STM32 I/O ports configuration.
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* @details Ports A-D(E, F, G) clocks enabled, AFIO clock enabled.
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*
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* @param[in] config the STM32 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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/*
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* Enables the GPIO related clocks.
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*/
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN |
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RCC_AHBENR_GPIOCEN | RCC_AHBENR_GPIODEN |
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RCC_AHBENR_GPIOEEN | RCC_AHBENR_GPIOHEN;
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RCC->AHBLPENR |= RCC_AHBLPENR_GPIOALPEN | RCC_AHBLPENR_GPIOBLPEN |
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RCC_AHBLPENR_GPIOCLPEN | RCC_AHBLPENR_GPIODLPEN |
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RCC_AHBLPENR_GPIOELPEN | RCC_AHBLPENR_GPIOHLPEN;
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/*
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* Initial GPIO setup.
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*/
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initgpio(GPIOA, &config->PAData);
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initgpio(GPIOB, &config->PBData);
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initgpio(GPIOC, &config->PCData);
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initgpio(GPIOD, &config->PDData);
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#if STM32_HAS_GPIOE
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initgpio(GPIOE, &config->PEData);
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#endif
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#if STM32_HAS_GPIOF
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initgpio(GPIOF, &config->PFData);
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#endif
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#if STM32_HAS_GPIOG
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initgpio(GPIOG, &config->PGData);
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#endif
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#if STM32_HAS_GPIOH
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initgpio(GPIOH, &config->PHData);
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#endif
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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 This function is not meant to be invoked directly by the
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* application code.
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* @note @p PAL_MODE_UNCONNECTED is implemented as push pull output at 2MHz.
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* @note Writing on pads programmed as pull-up or pull-down has the side
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* effect to modify the resistor setting because the output latched
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* data is used for the resistor selection.
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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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uint_fast8_t mode) {
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#if 0
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static const uint8_t cfgtab[] = {
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4, /* PAL_MODE_RESET, implemented as input.*/
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2, /* PAL_MODE_UNCONNECTED, implemented as push pull output 2MHz.*/
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4, /* PAL_MODE_INPUT */
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8, /* PAL_MODE_INPUT_PULLUP */
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8, /* PAL_MODE_INPUT_PULLDOWN */
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0, /* PAL_MODE_INPUT_ANALOG */
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3, /* PAL_MODE_OUTPUT_PUSHPULL, 50MHz.*/
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7, /* PAL_MODE_OUTPUT_OPENDRAIN, 50MHz.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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8, /* Reserved.*/
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0xB, /* PAL_MODE_STM32_ALTERNATE_PUSHPULL, 50MHz.*/
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0xF, /* PAL_MODE_STM32_ALTERNATE_OPENDRAIN, 50MHz.*/
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};
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uint32_t mh, ml, crh, crl, cfg;
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unsigned i;
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if (mode == PAL_MODE_INPUT_PULLUP)
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port->BSRR = mask;
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else if (mode == PAL_MODE_INPUT_PULLDOWN)
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port->BRR = mask;
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cfg = cfgtab[mode];
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mh = ml = crh = crl = 0;
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for (i = 0; i < 8; i++) {
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ml <<= 4;
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mh <<= 4;
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crl <<= 4;
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crh <<= 4;
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if ((mask & 0x0080) == 0)
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ml |= 0xf;
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else
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crl |= cfg;
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if ((mask & 0x8000) == 0)
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mh |= 0xf;
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else
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crh |= cfg;
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mask <<= 1;
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}
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port->CRH = (port->CRH & mh) | crh;
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port->CRL = (port->CRL & ml) | crl;
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#endif
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}
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#endif /* HAL_USE_PAL */
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/** @} */
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