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https://github.com/esp8266/Arduino.git
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c312a2eaf1
esp_yield() now also calls esp_schedule(), original esp_yield() function renamed to esp_suspend(). Don't use delay(0) in the Core internals, libraries and examples. Use yield() when the code is supposed to be called from CONT, use esp_yield() when the code can be called from either CONT or SYS. Clean-up esp_yield() and esp_schedule() declarations across the code and use coredecls.h instead. Implement helper functions for libraries that were previously using esp_yield(), esp_schedule() and esp_delay() directly to wait for certain SYS context tasks to complete. Correctly use esp_delay() for timeouts, make sure scheduled functions have a chance to run (e.g. LwIP_Ethernet uses recurrent) Related issues: - #6107 - discussion about the esp_yield() and esp_delay() usage in ClientContext - #6212 - discussion about replacing delay() with a blocking loop - #6680 - pull request introducing LwIP-based Ethernet - #7146 - discussion that originated UART code changes - #7969 - proposal to remove delay(0) from the example code - #8291 - discussion related to the run_scheduled_recurrent_functions() usage in LwIP Ethernet - #8317 - yieldUntil() implementation, similar to the esp_delay() overload with a timeout and a 0 interval
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
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cont_util.s - continuations support for Xtensa call0 ABI
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Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "cont.h"
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#include <stddef.h>
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#include <string.h>
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#include "ets_sys.h"
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extern "C" {
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#define CONT_STACKGUARD 0xfeefeffe
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void cont_init(cont_t* cont) {
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memset(cont, 0, sizeof(cont_t));
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cont->stack_guard1 = CONT_STACKGUARD;
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cont->stack_guard2 = CONT_STACKGUARD;
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cont->stack_end = cont->stack + (sizeof(cont->stack) / 4);
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cont->struct_start = (unsigned*) cont;
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// fill stack with magic values to check high water mark
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for(int pos = 0; pos < (int)(sizeof(cont->stack) / 4); pos++)
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{
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cont->stack[pos] = CONT_STACKGUARD;
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}
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}
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int IRAM_ATTR cont_check(cont_t* cont) {
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if(cont->stack_guard1 != CONT_STACKGUARD || cont->stack_guard2 != CONT_STACKGUARD) return 1;
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return 0;
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}
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// No need for this to be in IRAM, not expected to be IRQ called
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int cont_get_free_stack(cont_t* cont) {
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uint32_t *head = cont->stack;
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int freeWords = 0;
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while(*head == CONT_STACKGUARD)
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{
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head++;
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freeWords++;
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}
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return freeWords * 4;
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}
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bool IRAM_ATTR cont_can_suspend(cont_t* cont) {
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return !ETS_INTR_WITHINISR() &&
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cont->pc_ret != 0 && cont->pc_suspend == 0;
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}
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// No need for this to be in IRAM, not expected to be IRQ called
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void cont_repaint_stack(cont_t *cont)
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{
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register uint32_t *sp asm("a1");
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// Ensure 64 bytes adjacent to the current SP don't get touched to endure
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// we don't accidentally trounce over locals or IRQ temps.
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// Fill stack with magic values
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for ( uint32_t *pos = sp - 16; pos >= &cont->stack[0]; pos-- )
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{
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*pos = CONT_STACKGUARD;
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}
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}
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};
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