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irq.h
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irq.h
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_STM32_IRQ_H
#define MICROPY_INCLUDED_STM32_IRQ_H
// Use this macro together with NVIC_SetPriority to indicate that an IRQn is non-negative,
// which helps the compiler optimise the resulting inline function.
#define IRQn_NONNEG(pri) ((pri) & 0x7f)
// these states correspond to values from query_irq, enable_irq and disable_irq
#define IRQ_STATE_DISABLED (0x00000001)
#define IRQ_STATE_ENABLED (0x00000000)
// Enable this to get a count for the number of times each irq handler is called,
// accessible via pyb.irq_stats().
#define IRQ_ENABLE_STATS (0)
#if IRQ_ENABLE_STATS
#if defined(STM32H7)
#define IRQ_STATS_MAX (256)
#else
#define IRQ_STATS_MAX (128)
#endif
extern uint32_t irq_stats[IRQ_STATS_MAX];
#define IRQ_ENTER(irq) ++irq_stats[irq]
#define IRQ_EXIT(irq)
#else
#define IRQ_ENTER(irq)
#define IRQ_EXIT(irq)
#endif
static inline uint32_t query_irq(void) {
return __get_PRIMASK();
}
// enable_irq and disable_irq are defined inline in mpconfigport.h
#if __CORTEX_M >= 0x03
// irqs with a priority value greater or equal to "pri" will be disabled
// "pri" should be between 1 and 15 inclusive
static inline uint32_t raise_irq_pri(uint32_t pri) {
uint32_t basepri = __get_BASEPRI();
// If non-zero, the processor does not process any exception with a
// priority value greater than or equal to BASEPRI.
// When writing to BASEPRI_MAX the write goes to BASEPRI only if either:
// - Rn is non-zero and the current BASEPRI value is 0
// - Rn is non-zero and less than the current BASEPRI value
pri <<= (8 - __NVIC_PRIO_BITS);
__ASM volatile ("msr basepri_max, %0" : : "r" (pri) : "memory");
return basepri;
}
// "basepri" should be the value returned from raise_irq_pri
static inline void restore_irq_pri(uint32_t basepri) {
__set_BASEPRI(basepri);
}
#else
static inline uint32_t raise_irq_pri(uint32_t pri) {
return disable_irq();
}
// "state" should be the value returned from raise_irq_pri
static inline void restore_irq_pri(uint32_t state) {
enable_irq(state);
}
#endif
// IRQ priority definitions.
//
// Lower number implies higher interrupt priority.
//
// The default priority grouping is set to NVIC_PRIORITYGROUP_4 in the
// HAL_Init function. This corresponds to 4 bits for the priority field
// and 0 bits for the sub-priority field (which means that for all intensive
// purposes that the sub-priorities below are ignored).
//
// While a given interrupt is being processed, only higher priority (lower number)
// interrupts will preempt a given interrupt. If sub-priorities are active
// then the sub-priority determines the order that pending interrupts of
// a given priority are executed. This is only meaningful if 2 or more
// interrupts of the same priority are pending at the same time.
//
// The priority of the SysTick timer is determined from the TICK_INT_PRIORITY
// value which is normally set to 0 in the stm32f4xx_hal_conf.h file.
//
// The following interrupts are arranged from highest priority to lowest
// priority to make it a bit easier to figure out.
#if __CORTEX_M == 0
#define IRQ_PRI_SYSTICK 0
#define IRQ_PRI_UART 1
#define IRQ_PRI_SDIO 1
#define IRQ_PRI_DMA 1
#define IRQ_PRI_FLASH 2
#define IRQ_PRI_OTG_FS 2
#define IRQ_PRI_OTG_HS 2
#define IRQ_PRI_TIM5 2
#define IRQ_PRI_CAN 2
#define IRQ_PRI_TIMX 2
#define IRQ_PRI_EXTINT 2
#define IRQ_PRI_PENDSV 3
#define IRQ_PRI_RTC_WKUP 3
#else
#define IRQ_PRI_SYSTICK NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 0, 0)
// The UARTs have no FIFOs, so if they don't get serviced quickly then characters
// get dropped. The handling for each character only consumes about 0.5 usec
#define IRQ_PRI_UART NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 1, 0)
// SDIO must be higher priority than DMA for SDIO DMA transfers to work.
#define IRQ_PRI_SDIO NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 4, 0)
// DMA should be higher priority than USB, since USB Mass Storage calls
// into the sdcard driver which waits for the DMA to complete.
#define IRQ_PRI_DMA NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 5, 0)
// Flash IRQ (used for flushing storage cache) must be at the same priority as
// the USB IRQs, so that the IRQ priority can be raised to this level to disable
// both the USB and cache flushing, when storage transfers are in progress.
#define IRQ_PRI_FLASH NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
#define IRQ_PRI_OTG_FS NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
#define IRQ_PRI_OTG_HS NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
#define IRQ_PRI_TIM5 NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
#define IRQ_PRI_CAN NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 7, 0)
#define IRQ_PRI_SPI NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 8, 0)
// Interrupt priority for non-special timers.
#define IRQ_PRI_TIMX NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 13, 0)
#define IRQ_PRI_EXTINT NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 14, 0)
// PENDSV should be at the lowst priority so that other interrupts complete
// before exception is raised.
#define IRQ_PRI_PENDSV NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
#define IRQ_PRI_RTC_WKUP NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
#endif
#endif // MICROPY_INCLUDED_STM32_IRQ_H