mirror of
https://github.com/esp8266/Arduino.git
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67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
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/*
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core_esp8266_features.cpp
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Copyright (c) 2019 Mike Nix. 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 <eagle_soc.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* precache()
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* pre-loads flash data into the flash cache
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* if f==0, preloads instructions starting at the address we were called from.
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* otherwise preloads flash at the given address.
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* All preloads are word aligned.
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*/
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void precache(void *f, uint32_t bytes) {
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// Size of a cache page in bytes. We only need to read one word per
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// page (ie 1 word in 8) for this to work.
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#define CACHE_PAGE_SIZE 32
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uint32_t a0;
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__asm__("mov.n %0, a0" : "=r"(a0));
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uint32_t lines = (bytes/CACHE_PAGE_SIZE)+2;
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volatile uint32_t *p = (uint32_t*)((f ? (uint32_t)f : a0) & ~0x03);
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uint32_t x;
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for (uint32_t i=0; i<lines; i++, p+=CACHE_PAGE_SIZE/sizeof(uint32_t)) x=*p;
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(void)x;
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}
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/** based on efuse data, we could determine what type of chip this is
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* - https://github.com/espressif/esptool/blob/f04d34bcab29ace798d2d3800ba87020cccbbfdd/esptool.py#L1060-L1070
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* - https://github.com/espressif/ESP8266_RTOS_SDK/blob/3c055779e9793e5f082afff63a011d6615e73639/components/esp8266/include/esp8266/efuse_register.h#L20-L21
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*/
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bool esp_is_8285() {
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const uint32_t data[] {
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READ_PERI_REG(0x3ff00050), // aka MAC0
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READ_PERI_REG(0x3ff00058), // aka CHIPID
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};
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return ((data[0] & (1 << 4)) > 0)
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|| ((data[1] & (1 << 16)) > 0);
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}
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#ifdef __cplusplus
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}
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#endif
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