55 lines
937 B
C
55 lines
937 B
C
/*
|
|
* stm32f4xx_isr.c
|
|
*
|
|
* Created on: Nov 1, 2015
|
|
* Author: tkl
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "stm32f4xx.h"
|
|
#include "stm32f4xx_low_power.h"
|
|
#include "stm32f4xx_isr.h"
|
|
|
|
#define MAX_SYSCALL_INTERRUPT_PRIORITY (5 << (8 - __NVIC_PRIO_BITS))
|
|
|
|
__attribute__((naked)) uint32_t set_interrupt_mask(void)
|
|
{
|
|
__asm volatile \
|
|
( \
|
|
" mrs r0, basepri \n" \
|
|
" mov r1, %0 \n" \
|
|
" msr basepri, r1 \n" \
|
|
" bx lr \n" \
|
|
:: "i" (MAX_SYSCALL_INTERRUPT_PRIORITY) : "r0", "r1" \
|
|
);
|
|
|
|
return 0;
|
|
}
|
|
|
|
__attribute__((naked)) void clear_interrupt_mask(uint32_t new_mask_value)
|
|
{
|
|
__asm volatile \
|
|
( \
|
|
" msr basepri, r0 \n" \
|
|
" bx lr \n" \
|
|
:::"r0" \
|
|
);
|
|
|
|
(void) new_mask_value;
|
|
}
|
|
|
|
|
|
void enter_isr(void)
|
|
{
|
|
exit_low_power();
|
|
set_interrupt_mask();
|
|
}
|
|
|
|
void exit_isr(void)
|
|
{
|
|
*((volatile unsigned long *) 0xe000ed04) = 0x10000000;
|
|
clear_interrupt_mask(0);
|
|
}
|
|
|