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NVIC_Set_Interrupt_Priority: change to use 4-bit fields.

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(viz STM32F10xxx Cortex-M3 programming manual PM0056 and
Cortex-M3-Generic-User-Guide.pdf)

Doxygen commentary added
This commit is contained in:
Ken Sarkies
2012-07-09 16:54:01 +09:30
parent 83d62e9bfc
commit cba9561e89
3 changed files with 135 additions and 4 deletions
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101
lib/stm32/nvic.c
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@@ -1,3 +1,25 @@
/** @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.
*
@@ -20,47 +42,122 @@
#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) = priority;
NVIC_IPR(irqn / 4) = ((priority << ((irqn % 4) * 8));
}
void nvic_generate_software_interrupt(u8 irqn)
/*-----------------------------------------------------------------------------*/
/** @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;