OVMS3-idf/components/esp32/include/esp_spiram.h
Wangjialin 6e9c59bfc3 feature(psram): add support for 64MBit psram of 1.8v and 3.3v.
1. Add reading psram EID.
2. Configure different clock mode for different EID.
3. add API to get psram size and voltage.
4. Remove unnecessary VSPI claim.

For 32MBit@1.8V and 64MBit@3.3V psram, there should be 2 extra clock cycles after CS get high level.
For 64MBit@1.8 psram, we can just use standard SPI protocol to drive the psram. We also need to increase the HOLD time for CS in this case.

EID for psram:
32MBit 1.8v: 0x20
64MBit 1.8v: 0x26
64MBit 3.3v: 0x46
2018-07-10 14:24:59 +08:00

119 lines
3.4 KiB
C

// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __ESP_SPIRAM_H
#define __ESP_SPIRAM_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "esp_err.h"
typedef enum {
ESP_SPIRAM_VOLT_3V3 = 0, /*!< SPI RAM voltage is 3.3v */
ESP_SPIRAM_VOLT_1V8 = 1, /*!< SPI RAM voltage is 1.8v */
ESP_SPIRAM_VOLT_INVALID, /*!< SPI RAM voltage is invalid*/
} esp_spiram_volt_t;
typedef enum {
ESP_SPIRAM_SIZE_32MBITS = 0, /*!< SPI RAM size is 32 MBits */
ESP_SPIRAM_SIZE_64MBITS = 1, /*!< SPI RAM size is 64 MBits */
ESP_SPIRAM_SIZE_INVALID, /*!< SPI RAM size is invalid */
} esp_spiram_size_t;
/**
* @brief get SPI RAM voltage
* @return
* - ESP_SPIRAM_VOLT_INVALID if SPI RAM not enabled or not valid.
* - SPI RAM voltage
*/
esp_spiram_volt_t esp_spiram_get_chip_volt();
/**
* @brief get SPI RAM size
* @return
* - ESP_SPIRAM_SIZE_INVALID if SPI RAM not enabled or not valid
* - SPI RAM size
*/
esp_spiram_size_t esp_spiram_get_chip_size();
/**
* @brief Initialize spiram interface/hardware. Normally called from cpu_start.c.
*
* @return ESP_OK on success
*/
esp_err_t esp_spiram_init();
/**
* @brief Configure Cache/MMU for access to external SPI RAM.
*
* Normally this function is called from cpu_start, if CONFIG_SPIRAM_BOOT_INIT
* option is enabled. Applications which need to enable SPI RAM at run time
* can disable CONFIG_SPIRAM_BOOT_INIT, and call this function later.
*
* @attention this function must be called with flash cache disabled.
*/
void esp_spiram_init_cache();
/**
* @brief Memory test for SPI RAM. Should be called after SPI RAM is initialized and
* (in case of a dual-core system) the app CPU is online. This test overwrites the
* memory with crap, so do not call after e.g. the heap allocator has stored important
* stuff in SPI RAM.
*
* @return true on success, false on failed memory test
*/
bool esp_spiram_test();
/**
* @brief Add the initialized SPI RAM to the heap allocator.
*/
esp_err_t esp_spiram_add_to_heapalloc();
/**
* @brief Get the size of the attached SPI RAM chip selected in menuconfig
*
* @return Size in bytes, or 0 if no external RAM chip support compiled in.
*/
size_t esp_spiram_get_size();
/**
* @brief Force a writeback of the data in the SPI RAM cache. This is to be called whenever
* cache is disabled, because disabling cache on the ESP32 discards the data in the SPI
* RAM cache.
*
* This is meant for use from within the SPI flash code.
*/
void esp_spiram_writeback_cache();
/**
* @brief Reserve a pool of internal memory for specific DMA/internal allocations
*
* @param size Size of reserved pool in bytes
*
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM when no memory available for pool
*/
esp_err_t esp_spiram_reserve_dma_pool(size_t size);
#endif