Commit 9f5486c7 authored by Dave Hylands's avatar Dave Hylands Committed by Damien George
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stmhal: Put IRQs into priority order.

- added some comments to explain the priority/sub-priority.
- adds an entry for SDIO (to be used in a later patch)
- increases DMA priority above USB so that DMA can be used
  for sdcard I/O when using USB Mass Storage.
parent 056abbcf
...@@ -39,46 +39,75 @@ MP_DECLARE_CONST_FUN_OBJ(pyb_disable_irq_obj); ...@@ -39,46 +39,75 @@ MP_DECLARE_CONST_FUN_OBJ(pyb_disable_irq_obj);
MP_DECLARE_CONST_FUN_OBJ(pyb_enable_irq_obj); MP_DECLARE_CONST_FUN_OBJ(pyb_enable_irq_obj);
// IRQ priority definitions. // IRQ priority definitions.
//
// Lower number implies higher interrupt priority. // Lower number implies higher interrupt priority.
//
#define IRQ_PRI_CAN 0x7 // The default priority grouping is set to NVIC_PRIORITYGROUP_4 in the
#define IRQ_SUBPRI_CAN 0x0 // 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
#define IRQ_PRI_DMA 0x6 // purposes that the sub-priorities below are ignored).
#define IRQ_SUBPRI_DMA 0x0 //
// While a given interrupt is being processed, only higher priority (lower number)
#define IRQ_PRI_EXTINT 0xf // interrupts will preempt a given interrupt. If sub-priorities are active
#define IRQ_SUBPRI_EXTINT 0xf // 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.
// Priority Sub-Priority
// -------- ------------
//#def IRQ_PRI_SYSTICK 0
//#def IRQ_SUBPRI_SYSTICK 0
// Flash IRQ must be higher priority than interrupts of all those components // Flash IRQ must be higher priority than interrupts of all those components
// that rely on the flash storage. // that rely on the flash storage.
#define IRQ_PRI_FLASH 0x1 #define IRQ_PRI_FLASH 1
#define IRQ_SUBPRI_FLASH 0x1 #define IRQ_SUBPRI_FLASH 1
#define IRQ_PRI_OTG_FS 0x6 #define IRQ_PRI_SDIO 4
#define IRQ_SUBPRI_OTG_FS 0x0 #define IRQ_SUBPRI_SDIO 0
#define IRQ_PRI_OTG_HS 0x6 // DMA should be higher priority than USB, since USB Mass Storage calls
#define IRQ_SUBPRI_OTG_HS 0x0 // into the sdcard driver which waits for the DMA to complete.
#define IRQ_PRI_DMA 5
#define IRQ_SUBPRI_DMA 0
// PENDSV should be at the lowst priority so that other interrupts complete #define IRQ_PRI_OTG_FS 6
// before exception is raised. #define IRQ_SUBPRI_OTG_FS 0
#define IRQ_PRI_PENDSV 0xf
#define IRQ_SUBPRI_PENDSV 0xf #define IRQ_PRI_OTG_HS 6
#define IRQ_SUBPRI_OTG_HS 0
#define IRQ_PRI_RTC_WKUP 0xf #define IRQ_PRI_TIM3 6
#define IRQ_SUBPRI_RTC_WKUP 0xf #define IRQ_SUBPRI_TIM3 0
#define IRQ_PRI_TIM3 0x6 #define IRQ_PRI_TIM5 6
#define IRQ_SUBPRI_TIM3 0x0 #define IRQ_SUBPRI_TIM5 0
#define IRQ_PRI_TIM5 0x6 #define IRQ_PRI_CAN 7
#define IRQ_SUBPRI_TIM5 0x0 #define IRQ_SUBPRI_CAN 0
#define IRQ_PRI_UART 13
#define IRQ_SUBPRI_UART 13
// Interrupt priority for non-special timers. // Interrupt priority for non-special timers.
#define IRQ_PRI_TIMX 0xe #define IRQ_PRI_TIMX 14
#define IRQ_SUBPRI_TIMX 0xe #define IRQ_SUBPRI_TIMX 14
#define IRQ_PRI_EXTINT 15
#define IRQ_SUBPRI_EXTINT 15
// 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 15
#define IRQ_PRI_RTC_WKUP 15
#define IRQ_SUBPRI_RTC_WKUP 15
#define IRQ_PRI_UART 0xd
#define IRQ_SUBPRI_UART 0xd
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