mirror of
https://github.com/licsber/micropython.git
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04b9147e15
Blanket wide to all .c and .h files. Some files originating from ST are difficult to deal with (license wise) so it was left out of those. Also merged modpyb.h, modos.h, modstm.h and modtime.h in stmhal/.
110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* This file is part of the Micro Python 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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#include <stdlib.h>
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#include <stm32f4xx_hal.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "pendsv.h"
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static void *pendsv_object = NULL;
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void pendsv_init(void) {
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// set PendSV interrupt at lowest priority
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HAL_NVIC_SetPriority(PendSV_IRQn, 0xf, 0xf);
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}
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// call this function to raise a pending exception during an interrupt
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// it will wait until all interrupts are finished then raise the given
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// exception object using nlr_jump in the context of the top-level thread
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void pendsv_nlr_jump(void *o) {
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pendsv_object = o;
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SCB->ICSR = SCB_ICSR_PENDSVSET_Msk;
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}
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// since we play tricks with the stack, the compiler must not generate a
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// prelude for this function
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void pendsv_isr_handler(void) __attribute__((naked));
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void pendsv_isr_handler(void) {
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// re-jig the stack so that when we return from this interrupt handler
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// it returns instead to nlr_jump with argument pendsv_object
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// note that stack has a different layout if DEBUG is enabled
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//
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// on entry to this (naked) function, stack has the following layout:
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//
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// stack layout with DEBUG disabled:
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// sp[6]: pc
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// sp[5]: ?
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// sp[4]: ?
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// sp[3]: ?
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// sp[2]: ?
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// sp[1]: ?
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// sp[0]: r0
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//
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// stack layout with DEBUG enabled:
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// sp[8]: pc
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// sp[7]: lr
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// sp[6]: ?
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// sp[5]: ?
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// sp[4]: ?
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// sp[3]: ?
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// sp[2]: r0
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// sp[1]: 0xfffffff9
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// sp[0]: ?
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__asm volatile (
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"ldr r0, pendsv_object_ptr\n"
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"ldr r0, [r0]\n"
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#if defined(PENDSV_DEBUG)
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"str r0, [sp, #8]\n"
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#else
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"str r0, [sp, #0]\n"
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#endif
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"ldr r0, nlr_jump_ptr\n"
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#if defined(PENDSV_DEBUG)
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"str r0, [sp, #32]\n"
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#else
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"str r0, [sp, #24]\n"
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#endif
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"bx lr\n"
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".align 2\n"
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"pendsv_object_ptr: .word pendsv_object\n"
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"nlr_jump_ptr: .word nlr_jump\n"
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);
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/*
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uint32_t x[2] = {0x424242, 0xdeaddead};
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printf("PendSV: %p\n", x);
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for (uint32_t *p = (uint32_t*)(((uint32_t)x - 15) & 0xfffffff0), i = 64; i > 0; p += 4, i -= 4) {
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printf(" %p: %08x %08x %08x %08x\n", p, (uint)p[0], (uint)p[1], (uint)p[2], (uint)p[3]);
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}
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*/
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}
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