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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM32/pal_lld.c
* @brief STM32 GPIO low level driver code.
*
* @addtogroup STM32_PAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_PAL || defined(__DOXYGEN__)
#if defined(STM32F10X_LD)
#define APB2_RST_MASK (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST | \
RCC_APB2RSTR_IOPCRST | RCC_APB2RSTR_IOPDRST | \
RCC_APB2RSTR_AFIORST)
#define APB2_EN_MASK (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | \
RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN | \
RCC_APB2ENR_AFIOEN)
#elif defined(STM32F10X_HD)
#define APB2_RST_MASK (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST | \
RCC_APB2RSTR_IOPCRST | RCC_APB2RSTR_IOPDRST | \
RCC_APB2RSTR_IOPERST | RCC_APB2RSTR_IOPFRST | \
RCC_APB2RSTR_IOPGRST | RCC_APB2RSTR_AFIORST);
#define APB2_EN_MASK (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | \
RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN | \
RCC_APB2ENR_IOPEEN | RCC_APB2ENR_IOPFEN | \
RCC_APB2ENR_IOPGEN | RCC_APB2ENR_AFIOEN)
#else
/* Defaults on Medium Density and Connection Line devices.*/
#define APB2_RST_MASK (RCC_APB2RSTR_IOPARST | RCC_APB2RSTR_IOPBRST | \
RCC_APB2RSTR_IOPCRST | RCC_APB2RSTR_IOPDRST | \
RCC_APB2RSTR_IOPERST | RCC_APB2RSTR_AFIORST);
#define APB2_EN_MASK (RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | \
RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN | \
RCC_APB2ENR_IOPEEN | RCC_APB2ENR_AFIOEN)
#endif
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief STM32 I/O ports configuration.
* @details Ports A-D(E, F, G) clocks enabled, AFIO clock enabled.
*
* @param[in] config the STM32 ports configuration
*/
void _pal_lld_init(const PALConfig *config) {
/*
* Enables the GPIO related clocks.
*/
RCC->APB2ENR |= APB2_EN_MASK;
/*
* Resets the GPIO ports and AFIO.
*/
RCC->APB2RSTR = APB2_RST_MASK;
RCC->APB2RSTR = 0;
IOPORT1->ODR = config->PAData.odr;
IOPORT1->CRH = config->PAData.crh;
IOPORT1->CRL = config->PAData.crl;
IOPORT2->ODR = config->PBData.odr;
IOPORT2->CRH = config->PBData.crh;
IOPORT2->CRL = config->PBData.crl;
IOPORT3->ODR = config->PCData.odr;
IOPORT3->CRH = config->PCData.crh;
IOPORT3->CRL = config->PCData.crl;
IOPORT4->ODR = config->PDData.odr;
IOPORT4->CRH = config->PDData.crh;
IOPORT4->CRL = config->PDData.crl;
#if !defined(STM32F10X_LD) || defined(__DOXYGEN__)
IOPORT5->ODR = config->PEData.odr;
IOPORT5->CRH = config->PEData.crh;
IOPORT5->CRL = config->PEData.crl;
#endif
#if defined(STM32F10X_HD) || defined(__DOXYGEN__)
IOPORT6->ODR = config->PFData.odr;
IOPORT6->CRH = config->PFData.crh;
IOPORT6->CRL = config->PFData.crl;
IOPORT7->ODR = config->PGData.odr;
IOPORT7->CRH = config->PGData.crh;
IOPORT7->CRL = config->PGData.crl;
#endif
}
/**
* @brief Pads mode setup.
* @details This function programs a pads group belonging to the same port
* with the specified mode.
* @note This function is not meant to be invoked directly by the
* application code.
* @note @p PAL_MODE_UNCONNECTED is implemented as push pull output at 2MHz.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] mode the mode
*/
void _pal_lld_setgroupmode(ioportid_t port,
ioportmask_t mask,
uint_fast8_t mode) {
static const uint8_t cfgtab[] = {
4, /* PAL_MODE_RESET, implemented as input.*/
2, /* PAL_MODE_UNCONNECTED, implemented as push pull output 2MHz.*/
4, /* PAL_MODE_INPUT */
8, /* PAL_MODE_INPUT_PULLUP */
8, /* PAL_MODE_INPUT_PULLDOWN */
0, /* PAL_MODE_INPUT_ANALOG */
3, /* PAL_MODE_OUTPUT_PUSHPULL, 50MHz.*/
7, /* PAL_MODE_OUTPUT_OPENDRAIN, 50MHz.*/
8, /* Reserved.*/
8, /* Reserved.*/
8, /* Reserved.*/
8, /* Reserved.*/
8, /* Reserved.*/
8, /* Reserved.*/
8, /* Reserved.*/
8, /* Reserved.*/
0xB, /* PAL_MODE_STM32_ALTERNATE_PUSHPULL, 50MHz.*/
0xF, /* PAL_MODE_STM32_ALTERNATE_OPENDRAIN, 50MHz.*/
};
uint32_t mh, ml, crh, crl, cfg;
unsigned i;
if (mode == PAL_MODE_INPUT_PULLUP)
port->BSRR = mask;
else if (mode == PAL_MODE_INPUT_PULLDOWN)
port->BRR = mask;
cfg = cfgtab[mode];
mh = ml = crh = crl = 0;
for (i = 0; i < 8; i++) {
ml <<= 4;
mh <<= 4;
crl <<= 4;
crh <<= 4;
if ((mask & 0x0080) == 0)
ml |= 0xf;
else
crl |= cfg;
if ((mask & 0x8000) == 0)
mh |= 0xf;
else
crh |= cfg;
mask <<= 1;
}
port->CRH = (port->CRH & mh) | crh;
port->CRL = (port->CRL & ml) | crl;
}
#endif /* CH_HAL_USE_PAL */
/** @} */
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