blackmagic/lib/stm32/nvic.c

/** @file

@ingroup STM32F

@brief <b>libopencm3 STM32F Nested Vectored Interrupt Controller</b>

@version 1.0.0

@author @htmlonly &copy; @endhtmlonly 2010 Thomas Otto <tommi@viadmin.org>
@author @htmlonly &copy; @endhtmlonly 2012 Fergus Noble <fergusnoble@gmail.com>

@date 7 July 2012

The STM32F series provides up to 68 maskable user interrupts for the STM32F10x
series, and 87 for the STM32F2xx and STM32F4xx series.

The NVIC registers are defined by the ARM standards
@see Cortex-M3 Devices Generic User Guide


LGPL License Terms @ref lgpl_license
*/
/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
 * Copyright (C) 2012 Fergus Noble <fergusnoble@gmail.com>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <libopencm3/stm32/nvic.h>

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Enable Interrupt

Enables a user interrupt.

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
*/

void nvic_enable_irq(u8 irqn)
{
	NVIC_ISER(irqn / 32) = (1 << (irqn % 32));
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Disable Interrupt

Disables a user interrupt.

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
*/

void nvic_disable_irq(u8 irqn)
{
	NVIC_ICER(irqn / 32) = (1 << (irqn % 32));
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Return Pending Interrupt

True if the interrupt has occurred and is waiting for service.

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
@return Boolean. Interrupt pending.
*/

u8 nvic_get_pending_irq(u8 irqn)
{
	return NVIC_ISPR(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0;
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Set Pending Interrupt

Force a user interrupt to a pending state. No effect if the interrupt is already
pending.

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
*/

void nvic_set_pending_irq(u8 irqn)
{
	NVIC_ISPR(irqn / 32) = (1 << (irqn % 32));
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Clear Pending Interrupt

Force remove a user interrupt from a pending state. No effect if the interrupt is
actively being serviced.

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
*/

void nvic_clear_pending_irq(u8 irqn)
{
	NVIC_ICPR(irqn / 32) = (1 << (irqn % 32));
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Return Active Interrupt

Interrupt has occurred and is currently being serviced.

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
@return Boolean. Interrupt active.
*/

u8 nvic_get_active_irq(u8 irqn)
{
	return NVIC_IABR(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0;
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Return Enabled Interrupt

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
@return Boolean. Interrupt enabled.
*/

u8 nvic_get_irq_enabled(u8 irqn)
{
	return NVIC_ISER(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0;
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Set Interrupt Priority

@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint
@param[in] priority Unsigned int8. Interrupt priority (0 ... 255)
*/

void nvic_set_priority(u8 irqn, u8 priority)
{
	NVIC_IPR(irqn / 4) = ((priority << ((irqn % 4) * 8));
}

/*-----------------------------------------------------------------------------*/
/** @brief NVIC Software Trigger Interrupt

Generate an interrupt from software. This has no effect for unprivileged access
unless the privilege level has been elevated through the System Control Registers.

@param[in] sgin Unsigned int16. Interrupt number (0 ... 239)
*/

void nvic_generate_software_interrupt(u16 irqn)
{
	if (irqn <= 239)
		NVIC_STIR |= irqn;
}