a03e6c1e05
For a given IRQn (eg UART) there's no need to carry around both a PRI and SUBPRI value (eg IRQ_PRI_UART, IRQ_SUBPRI_UART). Instead, the IRQ_PRI_UART value has been changed in this patch to be the encoded hardware value, using NVIC_EncodePriority. This way the NVIC_SetPriority function can be used directly, instead of going through HAL_NVIC_SetPriority which must do extra processing to encode the PRI+SUBPRI. For a priority grouping of 4 (4 bits for preempt priority, 0 bits for the sub-priority), which is used in the stm32 port, the IRQ_PRI_xxx constants remain unchanged in their value. This patch also "fixes" the use of raise_irq_pri() which should be passed the encoded value (but as mentioned above the unencoded value is the same as the encoded value for priority grouping 4, so there was no bug from this error).
139 lines
5.8 KiB
C
139 lines
5.8 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_STM32_IRQ_H
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#define MICROPY_INCLUDED_STM32_IRQ_H
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// Use this macro together with NVIC_SetPriority to indicate that an IRQn is non-negative,
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// which helps the compiler optimise the resulting inline function.
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#define IRQn_NONNEG(pri) ((pri) & 0x7f)
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// these states correspond to values from query_irq, enable_irq and disable_irq
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#define IRQ_STATE_DISABLED (0x00000001)
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#define IRQ_STATE_ENABLED (0x00000000)
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// Enable this to get a count for the number of times each irq handler is called,
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// accessible via pyb.irq_stats().
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#define IRQ_ENABLE_STATS (0)
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#if IRQ_ENABLE_STATS
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extern uint32_t irq_stats[FPU_IRQn + 1];
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#define IRQ_ENTER(irq) ++irq_stats[irq]
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#define IRQ_EXIT(irq)
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#else
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#define IRQ_ENTER(irq)
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#define IRQ_EXIT(irq)
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#endif
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static inline mp_uint_t query_irq(void) {
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return __get_PRIMASK();
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}
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// enable_irq and disable_irq are defined inline in mpconfigport.h
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#if __CORTEX_M >= 0x03
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// irqs with a priority value greater or equal to "pri" will be disabled
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// "pri" should be between 1 and 15 inclusive
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static inline uint32_t raise_irq_pri(uint32_t pri) {
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uint32_t basepri = __get_BASEPRI();
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// If non-zero, the processor does not process any exception with a
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// priority value greater than or equal to BASEPRI.
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// When writing to BASEPRI_MAX the write goes to BASEPRI only if either:
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// - Rn is non-zero and the current BASEPRI value is 0
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// - Rn is non-zero and less than the current BASEPRI value
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pri <<= (8 - __NVIC_PRIO_BITS);
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__ASM volatile ("msr basepri_max, %0" : : "r" (pri) : "memory");
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return basepri;
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}
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// "basepri" should be the value returned from raise_irq_pri
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static inline void restore_irq_pri(uint32_t basepri) {
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__set_BASEPRI(basepri);
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}
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#endif
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MP_DECLARE_CONST_FUN_OBJ_0(pyb_wfi_obj);
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MP_DECLARE_CONST_FUN_OBJ_0(pyb_disable_irq_obj);
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MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_enable_irq_obj);
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MP_DECLARE_CONST_FUN_OBJ_0(pyb_irq_stats_obj);
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// IRQ priority definitions.
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//
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// Lower number implies higher interrupt priority.
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//
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// The default priority grouping is set to NVIC_PRIORITYGROUP_4 in the
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// HAL_Init function. This corresponds to 4 bits for the priority field
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// and 0 bits for the sub-priority field (which means that for all intensive
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// purposes that the sub-priorities below are ignored).
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//
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// While a given interrupt is being processed, only higher priority (lower number)
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// interrupts will preempt a given interrupt. If sub-priorities are active
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// then the sub-priority determines the order that pending interrupts of
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// a given priority are executed. This is only meaningful if 2 or more
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// interrupts of the same priority are pending at the same time.
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//
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// The priority of the SysTick timer is determined from the TICK_INT_PRIORITY
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// value which is normally set to 0 in the stm32f4xx_hal_conf.h file.
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//
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// The following interrupts are arranged from highest priority to lowest
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// priority to make it a bit easier to figure out.
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//#def IRQ_PRI_SYSTICK NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 0, 0)
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// The UARTs have no FIFOs, so if they don't get serviced quickly then characters
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// get dropped. The handling for each character only consumes about 0.5 usec
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#define IRQ_PRI_UART NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 1, 0)
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// Flash IRQ must be higher priority than interrupts of all those components
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// that rely on the flash storage.
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#define IRQ_PRI_FLASH NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 2, 0)
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// SDIO must be higher priority than DMA for SDIO DMA transfers to work.
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#define IRQ_PRI_SDIO NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 4, 0)
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// DMA should be higher priority than USB, since USB Mass Storage calls
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// into the sdcard driver which waits for the DMA to complete.
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#define IRQ_PRI_DMA NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 5, 0)
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#define IRQ_PRI_OTG_FS NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
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#define IRQ_PRI_OTG_HS NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
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#define IRQ_PRI_TIM5 NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 6, 0)
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#define IRQ_PRI_CAN NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 7, 0)
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// Interrupt priority for non-special timers.
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#define IRQ_PRI_TIMX NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 13, 0)
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#define IRQ_PRI_EXTINT NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 14, 0)
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// PENDSV should be at the lowst priority so that other interrupts complete
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// before exception is raised.
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#define IRQ_PRI_PENDSV NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
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#define IRQ_PRI_RTC_WKUP NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
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#endif // MICROPY_INCLUDED_STM32_IRQ_H
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