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/**
* @file
*
* @ingroup RTEMSBSPsARMLPC176X
*
* @brief Watchdog controller for the mbed lpc176x family boards.
*/
/*
* Copyright (c) 2014 Taller Technologies.
*
* @author Boretto Martin (martin.boretto@tallertechnologies.com)
* @author Diaz Marcos (marcos.diaz@tallertechnologies.com)
* @author Lenarduzzi Federico (federico.lenarduzzi@tallertechnologies.com)
* @author Daniel Chicco (daniel.chicco@tallertechnologies.com)
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <assert.h>
#include <rtems/status-checks.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/watchdog.h>
#include <bsp/io.h>
inline bool lpc176x_been_reset_by_watchdog( void )
{
return ( ( LPC176X_WDMOD & LPC176X_WWDT_MOD_WDTOF ) ==
LPC176X_WWDT_MOD_WDTOF );
}
inline void lpc176x_watchdog_reset( void )
{
LPC176X_WDFEED = LPC176X_WDFEED_CON;
LPC176X_WDFEED = LPC176X_WDFEED_CFG;
}
/**
* @brief Enables the watchdog module, sets wd clock and wd timer.
*
* @param tcount Timer's out value.
* @return RTEMS_SUCCESSFUL if the configuration was done successfully.
*/
static inline rtems_status_code enable_module_and_set_clocksel(
const lpc176x_microseconds tcount )
{
rtems_status_code status_code;
/* Sets clock. */
LPC176X_WDCLKSEL = LPC176X_WWDT_CLKSEL_WDSEL_PCLK;
/* Enables the watchdog module. */
status_code = lpc176x_module_enable( LPC176X_MODULE_WD,
LPC176X_MODULE_PCLK_DEFAULT );
RTEMS_CHECK_SC( status_code, "Enabling the watchdog module." );
/* Set the watchdog timer constant value. */
LPC176X_WDTC = ( LPC176X_CCLK / LPC176X_WD_PRESCALER_DIVISOR ) * tcount;
return status_code;
}
rtems_status_code lpc176x_watchdog_config( const lpc176x_microseconds tcount )
{
rtems_status_code status_code = enable_module_and_set_clocksel( tcount );
/* Setup the Watchdog timer operating mode in WDMOD register. */
LPC176X_WDMOD = LPC176X_WWDT_MOD_WDEN | LPC176X_WWDT_MOD_WDRESET;
/* Enable the Watchdog by writing 0xAA followed by 0x55 to the
WDFEED register. */
lpc176x_watchdog_reset();
return status_code;
}
rtems_status_code lpc176x_watchdog_config_with_interrupt(
const lpc176x_wd_isr_funct interrupt,
const lpc176x_microseconds tcount
)
{
rtems_status_code status_code = enable_module_and_set_clocksel( tcount );
/* Setup the Watchdog timer operating mode in WDMOD register. */
LPC176X_WDMOD = LPC176X_WWDT_MOD_WDEN | LPC176X_WWDT_MOD_WDINT;
status_code = rtems_interrupt_handler_install(
LPC176X_WD_INTERRUPT_VECTOR_NUMBER,
"watchdog_interrupt",
RTEMS_INTERRUPT_UNIQUE,
interrupt,
NULL );
/* Enable the Watchdog by writing 0xAA followed by 0x55 to the
WDFEED register. */
lpc176x_watchdog_reset();
return status_code;
}
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