pal_lld.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file AT91SAM7/pal_lld.c
* @brief AT91SAM7 PIO low level driver code.
*
* @addtogroup PAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_PAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief AT91SAM7 I/O ports configuration.
* @details PIO registers initialization.
*
* @param[in] config the AT91SAM7 ports configuration
*
* @notapi
*/
void _pal_lld_init(const PALConfig *config) {
uint32_t ports = (1 << AT91C_ID_PIOA);
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
ports |= (1 << AT91C_ID_PIOB);
#endif
AT91C_BASE_PMC->PMC_PCER = ports;
/*
* PIOA setup.
*/
AT91C_BASE_PIOA->PIO_PPUER = config->P0Data.pusr; /* Pull-up as spec.*/
AT91C_BASE_PIOA->PIO_PPUDR = ~config->P0Data.pusr;
AT91C_BASE_PIOA->PIO_PER = 0xFFFFFFFF; /* PIO enabled.*/
AT91C_BASE_PIOA->PIO_ODSR = config->P0Data.odsr; /* Data as specified.*/
AT91C_BASE_PIOA->PIO_OER = config->P0Data.osr; /* Dir. as specified.*/
AT91C_BASE_PIOA->PIO_ODR = ~config->P0Data.osr;
AT91C_BASE_PIOA->PIO_IFDR = 0xFFFFFFFF; /* Filter disabled.*/
AT91C_BASE_PIOA->PIO_IDR = 0xFFFFFFFF; /* Int. disabled.*/
AT91C_BASE_PIOA->PIO_MDDR = 0xFFFFFFFF; /* Push Pull drive.*/
AT91C_BASE_PIOA->PIO_ASR = 0xFFFFFFFF; /* Peripheral A.*/
AT91C_BASE_PIOA->PIO_OWER = 0xFFFFFFFF; /* Write enabled.*/
/*
* PIOB setup.
*/
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
AT91C_BASE_PIOB->PIO_PPUER = config->P1Data.pusr; /* Pull-up as spec.*/
AT91C_BASE_PIOB->PIO_PPUDR = ~config->P1Data.pusr;
AT91C_BASE_PIOB->PIO_PER = 0xFFFFFFFF; /* PIO enabled.*/
AT91C_BASE_PIOB->PIO_ODSR = config->P1Data.odsr; /* Data as specified.*/
AT91C_BASE_PIOB->PIO_OER = config->P1Data.osr; /* Dir. as specified.*/
AT91C_BASE_PIOB->PIO_ODR = ~config->P1Data.osr;
AT91C_BASE_PIOB->PIO_IFDR = 0xFFFFFFFF; /* Filter disabled.*/
AT91C_BASE_PIOB->PIO_IDR = 0xFFFFFFFF; /* Int. disabled.*/
AT91C_BASE_PIOB->PIO_MDDR = 0xFFFFFFFF; /* Push Pull drive.*/
AT91C_BASE_PIOB->PIO_ASR = 0xFFFFFFFF; /* Peripheral A.*/
AT91C_BASE_PIOB->PIO_OWER = 0xFFFFFFFF; /* Write enabled.*/
#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 from the
* application code.
* @note @p PAL_MODE_RESET is implemented as input with pull-up.
* @note @p PAL_MODE_UNCONNECTED is implemented as push pull output with
* high state.
* @note @p PAL_MODE_OUTPUT_OPENDRAIN also enables the pull-up resistor.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] mode the mode
*
* @notapi
*/
void _pal_lld_setgroupmode(ioportid_t port,
ioportmask_t mask,
iomode_t mode) {
switch (mode) {
case PAL_MODE_RESET:
case PAL_MODE_INPUT_PULLUP:
port->PIO_PPUER = mask;
port->PIO_ODR = mask;
break;
case PAL_MODE_INPUT:
case PAL_MODE_INPUT_ANALOG:
port->PIO_PPUDR = mask;
port->PIO_ODR = mask;
break;
case PAL_MODE_UNCONNECTED:
port->PIO_SODR = mask;
/* Falls in */
case PAL_MODE_OUTPUT_PUSHPULL:
port->PIO_PPUDR = mask;
port->PIO_OER = mask;
port->PIO_MDDR = mask;
break;
case PAL_MODE_OUTPUT_OPENDRAIN:
port->PIO_PPUER = mask;
port->PIO_OER = mask;
port->PIO_MDER = mask;
}
}
#endif /* HAL_USE_PAL */
/** @} */