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stm32/irq: Define IRQ priorities directly as encoded hardware values.

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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).
This commit is contained in:
Damien George
2018-05-02 14:41:02 +10:00
parent 266446624f
commit a03e6c1e05
12 changed files with 35 additions and 49 deletions
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48
ports/stm32/irq.h
View File

@@ -26,6 +26,10 @@
#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)
@@ -98,55 +102,37 @@ MP_DECLARE_CONST_FUN_OBJ_0(pyb_irq_stats_obj);
// The following interrupts are arranged from highest priority to lowest
// priority to make it a bit easier to figure out.
// Priority Sub-Priority
// -------- ------------
//#def IRQ_PRI_SYSTICK 0
//#def IRQ_SUBPRI_SYSTICK 0
//#def 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 1
#define IRQ_SUBPRI_UART 0
#define IRQ_PRI_UART NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 1, 0)
// Flash IRQ must be higher priority than interrupts of all those components
// that rely on the flash storage.
#define IRQ_PRI_FLASH 2
#define IRQ_SUBPRI_FLASH 0
#define IRQ_PRI_FLASH NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 2, 0)
// SDIO must be higher priority than DMA for SDIO DMA transfers to work.
#define IRQ_PRI_SDIO 4
#define IRQ_SUBPRI_SDIO 0
#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 5
#define IRQ_SUBPRI_DMA 0
#define IRQ_PRI_DMA NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 5, 0)
#define IRQ_PRI_OTG_FS 6
#define IRQ_SUBPRI_OTG_FS 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_OTG_HS 6
#define IRQ_SUBPRI_OTG_HS 0
#define IRQ_PRI_TIM5 6
#define IRQ_SUBPRI_TIM5 0
#define IRQ_PRI_CAN 7
#define IRQ_SUBPRI_CAN 0
#define IRQ_PRI_CAN NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 7, 0)
// Interrupt priority for non-special timers.
#define IRQ_PRI_TIMX 13
#define IRQ_SUBPRI_TIMX 0
#define IRQ_PRI_TIMX NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 13, 0)
#define IRQ_PRI_EXTINT 14
#define IRQ_SUBPRI_EXTINT 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 15
#define IRQ_SUBPRI_PENDSV 0
#define IRQ_PRI_RTC_WKUP 15
#define IRQ_SUBPRI_RTC_WKUP 0
#define IRQ_PRI_PENDSV NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
#define IRQ_PRI_RTC_WKUP NVIC_EncodePriority(NVIC_PRIORITYGROUP_4, 15, 0)
#endif // MICROPY_INCLUDED_STM32_IRQ_H