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/*
ChibiOS/RT - Copyright (C) 2006-2007 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 STM32F103/pal_lld.c
* @brief STM32 GPIO low level driver code
* @addtogroup STM32F103_PAL
* @{
*/
#include <ch.h>
#include <pal.h>
#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 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
/**
* @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 STM32GPIOConfig *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;
IOPORT_A->ODR = config->PAData.odr;
IOPORT_A->CRH = config->PAData.crh;
IOPORT_A->CRL = config->PAData.crl;
IOPORT_B->ODR = config->PBData.odr;
IOPORT_B->CRH = config->PBData.crh;
IOPORT_B->CRL = config->PBData.crl;
IOPORT_C->ODR = config->PCData.odr;
IOPORT_C->CRH = config->PCData.crh;
IOPORT_C->CRL = config->PCData.crl;
IOPORT_D->ODR = config->PDData.odr;
IOPORT_D->CRH = config->PDData.crh;
IOPORT_D->CRL = config->PDData.crl;
#if !defined(STM32F10X_LD) || defined(__DOXYGEN__)
IOPORT_E->ODR = config->PEData.odr;
IOPORT_E->CRH = config->PEData.crh;
IOPORT_E->CRL = config->PEData.crl;
#endif
#if defined(STM32F10X_HD) || defined(__DOXYGEN__)
IOPORT_F->ODR = config->PFData.odr;
IOPORT_F->CRH = config->PFData.crh;
IOPORT_F->CRL = config->PFData.crl;
IOPORT_G->ODR = config->PGData.odr;
IOPORT_G->CRH = config->PGData.crh;
IOPORT_G->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.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] mode the 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.
*/
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 */
3, /* PAL_MODE_OUTPUT_PUSHPULL, 50MHz.*/
7, /* PAL_MODE_OUTPUT_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 & 1) == 0)
ml |= 0xf;
else
crl |= cfg;
if ((mask & 0x10000) == 0)
mh |= 0xf;
else
crh |= cfg;
mask >>= 1;
}
port->CRH = (port->CRH & mh) | crh;
port->CRL = (port->CRL & ml) | crl;
}
/** @} */
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