98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "esp_spi_flash.h"
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#include "spi_flash_emulation.h"
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static SpiFlashEmulator* s_emulator = nullptr;
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void spi_flash_emulator_set(SpiFlashEmulator* e)
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{
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s_emulator = e;
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}
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esp_err_t spi_flash_erase_sector(size_t sec)
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{
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if (!s_emulator) {
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return ESP_ERR_FLASH_OP_TIMEOUT;
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}
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if (!s_emulator->erase(sec)) {
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return ESP_ERR_FLASH_OP_FAIL;
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}
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return ESP_OK;
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}
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esp_err_t spi_flash_write(size_t des_addr, const void *src_addr, size_t size)
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{
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if (!s_emulator) {
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return ESP_ERR_FLASH_OP_TIMEOUT;
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}
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if (!s_emulator->write(des_addr, reinterpret_cast<const uint32_t*>(src_addr), size)) {
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return ESP_ERR_FLASH_OP_FAIL;
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}
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return ESP_OK;
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}
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esp_err_t spi_flash_read(size_t src_addr, void *des_addr, size_t size)
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{
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if (!s_emulator) {
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return ESP_ERR_FLASH_OP_TIMEOUT;
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}
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if (!s_emulator->read(reinterpret_cast<uint32_t*>(des_addr), src_addr, size)) {
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return ESP_ERR_FLASH_OP_FAIL;
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}
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return ESP_OK;
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}
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// timing data for ESP8266, 160MHz CPU frequency, 80MHz flash requency
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// all values in microseconds
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// values are for block sizes starting at 4 bytes and going up to 4096 bytes
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static size_t readTimes[] = {7, 5, 6, 7, 11, 18, 32, 60, 118, 231, 459};
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static size_t writeTimes[] = {19, 23, 35, 57, 106, 205, 417, 814, 1622, 3200, 6367};
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static size_t blockEraseTime = 37142;
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static size_t timeInterp(uint32_t bytes, size_t* lut)
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{
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int lz = __builtin_clz(bytes / 4);
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int log_size = 32 - lz;
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size_t x2 = 1 << (log_size + 2);
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size_t y2 = lut[log_size];
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size_t x1 = 1 << (log_size + 1);
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size_t y1 = lut[log_size - 1];
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return (bytes - x1) * (y2 - y1) / (x2 - x1) + y1;
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}
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size_t SpiFlashEmulator::getReadOpTime(uint32_t bytes)
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{
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return timeInterp(bytes, readTimes);
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}
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size_t SpiFlashEmulator::getWriteOpTime(uint32_t bytes)
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{
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return timeInterp(bytes, writeTimes);
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}
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size_t SpiFlashEmulator::getEraseOpTime()
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{
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return blockEraseTime;
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}
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