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feat(spi_flash): Add partition driver

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Commit ID: c2b39f4a
This commit is contained in:
Dong Heng
2018-06-05 16:57:23 +08:00
committed by Wu Jian Gang
parent 5358373550
commit 55bad94c43
3 changed files with 692 additions and 0 deletions
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73
components/spi_flash/include/esp_flash_data_types.h Normal file
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// Copyright 2015-2016 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_BIN_TYPES_H__
#define __ESP_BIN_TYPES_H__
#include <stdint.h>
#ifdef __cplusplus
extern "C"
{
#endif
#define ESP_PARTITION_TABLE_ADDR 0x8000
#define ESP_PARTITION_MAGIC 0x50AA
/* OTA selection structure (two copies in the OTA data partition.)
Size of 32 bytes is friendly to flash encryption */
typedef struct {
uint32_t ota_seq;
uint8_t seq_label[24];
uint32_t crc; /* CRC32 of ota_seq field only */
} esp_ota_select_entry_t;
typedef struct {
uint32_t offset;
uint32_t size;
} esp_partition_pos_t;
/* Structure which describes the layout of partition table entry.
* See docs/partition_tables.rst for more information about individual fields.
*/
typedef struct {
uint16_t magic;
uint8_t type;
uint8_t subtype;
esp_partition_pos_t pos;
uint8_t label[16];
uint32_t flags;
} esp_partition_info_t;
#define PART_TYPE_APP 0x00
#define PART_SUBTYPE_FACTORY 0x00
#define PART_SUBTYPE_OTA_FLAG 0x10
#define PART_SUBTYPE_OTA_MASK 0x0f
#define PART_SUBTYPE_TEST 0x20
#define PART_TYPE_DATA 0x01
#define PART_SUBTYPE_DATA_OTA 0x00
#define PART_SUBTYPE_DATA_RF 0x01
#define PART_SUBTYPE_DATA_WIFI 0x02
#define PART_TYPE_END 0xff
#define PART_SUBTYPE_END 0xff
#define PART_FLAG_ENCRYPTED (1<<0)
#ifdef __cplusplus
}
#endif
#endif //__ESP_BIN_TYPES_H__

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// Copyright 2015-2016 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_PARTITION_H__
#define __ESP_PARTITION_H__
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include "esp_err.h"
#include "esp_spi_flash.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @file esp_partition.h
* @brief Partition APIs
*/
/**
* @brief Partition type
* @note Keep this enum in sync with PartitionDefinition class gen_esp32part.py
*/
typedef enum {
ESP_PARTITION_TYPE_APP = 0x00, //!< Application partition type
ESP_PARTITION_TYPE_DATA = 0x01, //!< Data partition type
} esp_partition_type_t;
/**
* @brief Partition subtype
* @note Keep this enum in sync with PartitionDefinition class gen_esp32part.py
*/
typedef enum {
ESP_PARTITION_SUBTYPE_APP_FACTORY = 0x00, //!< Factory application partition
ESP_PARTITION_SUBTYPE_APP_OTA_MIN = 0x10, //!< Base for OTA partition subtypes
ESP_PARTITION_SUBTYPE_APP_OTA_0 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 0, //!< OTA partition 0
ESP_PARTITION_SUBTYPE_APP_OTA_1 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 1, //!< OTA partition 1
ESP_PARTITION_SUBTYPE_APP_OTA_2 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 2, //!< OTA partition 2
ESP_PARTITION_SUBTYPE_APP_OTA_3 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 3, //!< OTA partition 3
ESP_PARTITION_SUBTYPE_APP_OTA_4 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 4, //!< OTA partition 4
ESP_PARTITION_SUBTYPE_APP_OTA_5 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 5, //!< OTA partition 5
ESP_PARTITION_SUBTYPE_APP_OTA_6 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 6, //!< OTA partition 6
ESP_PARTITION_SUBTYPE_APP_OTA_7 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 7, //!< OTA partition 7
ESP_PARTITION_SUBTYPE_APP_OTA_8 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 8, //!< OTA partition 8
ESP_PARTITION_SUBTYPE_APP_OTA_9 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 9, //!< OTA partition 9
ESP_PARTITION_SUBTYPE_APP_OTA_10 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 10,//!< OTA partition 10
ESP_PARTITION_SUBTYPE_APP_OTA_11 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 11,//!< OTA partition 11
ESP_PARTITION_SUBTYPE_APP_OTA_12 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 12,//!< OTA partition 12
ESP_PARTITION_SUBTYPE_APP_OTA_13 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 13,//!< OTA partition 13
ESP_PARTITION_SUBTYPE_APP_OTA_14 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 14,//!< OTA partition 14
ESP_PARTITION_SUBTYPE_APP_OTA_15 = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 15,//!< OTA partition 15
ESP_PARTITION_SUBTYPE_APP_OTA_MAX = ESP_PARTITION_SUBTYPE_APP_OTA_MIN + 16,//!< Max subtype of OTA partition
ESP_PARTITION_SUBTYPE_APP_TEST = 0x20, //!< Test application partition
ESP_PARTITION_SUBTYPE_DATA_OTA = 0x00, //!< OTA selection partition
ESP_PARTITION_SUBTYPE_DATA_PHY = 0x01, //!< PHY init data partition
ESP_PARTITION_SUBTYPE_DATA_NVS = 0x02, //!< NVS partition
ESP_PARTITION_SUBTYPE_DATA_COREDUMP = 0x03, //!< COREDUMP partition
ESP_PARTITION_SUBTYPE_DATA_ESPHTTPD = 0x80, //!< ESPHTTPD partition
ESP_PARTITION_SUBTYPE_DATA_FAT = 0x81, //!< FAT partition
ESP_PARTITION_SUBTYPE_DATA_SPIFFS = 0x82, //!< SPIFFS partition
ESP_PARTITION_SUBTYPE_ANY = 0xff, //!< Used to search for partitions with any subtype
} esp_partition_subtype_t;
/**
* @brief Convenience macro to get esp_partition_subtype_t value for the i-th OTA partition
*/
#define ESP_PARTITION_SUBTYPE_OTA(i) ((esp_partition_subtype_t)(ESP_PARTITION_SUBTYPE_APP_OTA_MIN + ((i) & 0xf)))
/**
* @brief Opaque partition iterator type
*/
typedef struct esp_partition_iterator_opaque_* esp_partition_iterator_t;
/**
* @brief partition information structure
*
* This is not the format in flash, that format is esp_partition_info_t.
*
* However, this is the format used by this API.
*/
typedef struct {
esp_partition_type_t type; /*!< partition type (app/data) */
esp_partition_subtype_t subtype; /*!< partition subtype */
uint32_t address; /*!< starting address of the partition in flash */
uint32_t size; /*!< size of the partition, in bytes */
char label[17]; /*!< partition label, zero-terminated ASCII string */
bool encrypted; /*!< flag is set to true if partition is encrypted */
} esp_partition_t;
/**
* @brief Find partition based on one or more parameters
*
* @param type Partition type, one of esp_partition_type_t values
* @param subtype Partition subtype, one of esp_partition_subtype_t values.
* To find all partitions of given type, use
* ESP_PARTITION_SUBTYPE_ANY.
* @param label (optional) Partition label. Set this value if looking
* for partition with a specific name. Pass NULL otherwise.
*
* @return iterator which can be used to enumerate all the partitions found,
* or NULL if no partitions were found.
* Iterator obtained through this function has to be released
* using esp_partition_iterator_release when not used any more.
*/
esp_partition_iterator_t esp_partition_find(esp_partition_type_t type, esp_partition_subtype_t subtype, const char* label);
/**
* @brief Find first partition based on one or more parameters
*
* @param type Partition type, one of esp_partition_type_t values
* @param subtype Partition subtype, one of esp_partition_subtype_t values.
* To find all partitions of given type, use
* ESP_PARTITION_SUBTYPE_ANY.
* @param label (optional) Partition label. Set this value if looking
* for partition with a specific name. Pass NULL otherwise.
*
* @return pointer to esp_partition_t structure, or NULL if no partition is found.
* This pointer is valid for the lifetime of the application.
*/
const esp_partition_t* esp_partition_find_first(esp_partition_type_t type, esp_partition_subtype_t subtype, const char* label);
/**
* @brief Get esp_partition_t structure for given partition
*
* @param iterator Iterator obtained using esp_partition_find. Must be non-NULL.
*
* @return pointer to esp_partition_t structure. This pointer is valid for the lifetime
* of the application.
*/
const esp_partition_t* esp_partition_get(esp_partition_iterator_t iterator);
/**
* @brief Move partition iterator to the next partition found
*
* Any copies of the iterator will be invalid after this call.
*
* @param iterator Iterator obtained using esp_partition_find. Must be non-NULL.
*
* @return NULL if no partition was found, valid esp_partition_iterator_t otherwise.
*/
esp_partition_iterator_t esp_partition_next(esp_partition_iterator_t iterator);
/**
* @brief Release partition iterator
*
* @param iterator Iterator obtained using esp_partition_find. Must be non-NULL.
*
*/
void esp_partition_iterator_release(esp_partition_iterator_t iterator);
/**
* @brief Verify partition data
*
* Given a pointer to partition data, verify this partition exists in the partition table (all fields match.)
*
* This function is also useful to take partition data which may be in a RAM buffer and convert it to a pointer to the
* permanent partition data stored in flash.
*
* Pointers returned from this function can be compared directly to the address of any pointer returned from
* esp_partition_get(), as a test for equality.
*
* @param partition Pointer to partition data to verify. Must be non-NULL. All fields of this structure must match the
* partition table entry in flash for this function to return a successful match.
*
* @return
* - If partition not found, returns NULL.
* - If found, returns a pointer to the esp_partition_t structure in flash. This pointer is always valid for the lifetime of the application.
*/
const esp_partition_t *esp_partition_verify(const esp_partition_t *partition);
/**
* @brief Read data from the partition
*
* @param partition Pointer to partition structure obtained using
* esp_partition_find_first or esp_partition_get.
* Must be non-NULL.
* @param dst Pointer to the buffer where data should be stored.
* Pointer must be non-NULL and buffer must be at least 'size' bytes long.
* @param src_offset Address of the data to be read, relative to the
* beginning of the partition.
* @param size Size of data to be read, in bytes.
*
* @return ESP_OK, if data was read successfully;
* ESP_ERR_INVALID_ARG, if src_offset exceeds partition size;
* ESP_ERR_INVALID_SIZE, if read would go out of bounds of the partition;
* or one of error codes from lower-level flash driver.
*/
esp_err_t esp_partition_read(const esp_partition_t* partition,
size_t src_offset, void* dst, size_t size);
/**
* @brief Write data to the partition
*
* Before writing data to flash, corresponding region of flash needs to be erased.
* This can be done using esp_partition_erase_range function.
*
* Partitions marked with an encryption flag will automatically be
* written via the spi_flash_write_encrypted() function. If writing to
* an encrypted partition, all write offsets and lengths must be
* multiples of 16 bytes. See the spi_flash_write_encrypted() function
* for more details. Unencrypted partitions do not have this
* restriction.
*
* @param partition Pointer to partition structure obtained using
* esp_partition_find_first or esp_partition_get.
* Must be non-NULL.
* @param dst_offset Address where the data should be written, relative to the
* beginning of the partition.
* @param src Pointer to the source buffer. Pointer must be non-NULL and
* buffer must be at least 'size' bytes long.
* @param size Size of data to be written, in bytes.
*
* @note Prior to writing to flash memory, make sure it has been erased with
* esp_partition_erase_range call.
*
* @return ESP_OK, if data was written successfully;
* ESP_ERR_INVALID_ARG, if dst_offset exceeds partition size;
* ESP_ERR_INVALID_SIZE, if write would go out of bounds of the partition;
* or one of error codes from lower-level flash driver.
*/
esp_err_t esp_partition_write(const esp_partition_t* partition,
size_t dst_offset, const void* src, size_t size);
/**
* @brief Erase part of the partition
*
* @param partition Pointer to partition structure obtained using
* esp_partition_find_first or esp_partition_get.
* Must be non-NULL.
* @param start_addr Address where erase operation should start. Must be aligned
* to 4 kilobytes.
* @param size Size of the range which should be erased, in bytes.
* Must be divisible by 4 kilobytes.
*
* @return ESP_OK, if the range was erased successfully;
* ESP_ERR_INVALID_ARG, if iterator or dst are NULL;
* ESP_ERR_INVALID_SIZE, if erase would go out of bounds of the partition;
* or one of error codes from lower-level flash driver.
*/
esp_err_t esp_partition_erase_range(const esp_partition_t* partition,
uint32_t start_addr, uint32_t size);
/**
* @brief Configure MMU to map partition into data memory
*
* Unlike spi_flash_mmap function, which requires a 64kB aligned base address,
* this function doesn't impose such a requirement.
* If offset results in a flash address which is not aligned to 64kB boundary,
* address will be rounded to the lower 64kB boundary, so that mapped region
* includes requested range.
* Pointer returned via out_ptr argument will be adjusted to point to the
* requested offset (not necessarily to the beginning of mmap-ed region).
*
* To release mapped memory, pass handle returned via out_handle argument to
* spi_flash_munmap function.
*
* @param partition Pointer to partition structure obtained using
* esp_partition_find_first or esp_partition_get.
* Must be non-NULL.
* @param offset Offset from the beginning of partition where mapping should start.
* @param size Size of the area to be mapped.
* @param memory Memory space where the region should be mapped
* @param out_ptr Output, pointer to the mapped memory region
* @param out_handle Output, handle which should be used for spi_flash_munmap call
*
* @return ESP_OK, if successful
*/
esp_err_t esp_partition_mmap(const esp_partition_t* partition, uint32_t offset, uint32_t size,
spi_flash_mmap_memory_t memory,
const void** out_ptr, spi_flash_mmap_handle_t* out_handle);
#ifdef __cplusplus
}
#endif
#endif /* __ESP_PARTITION_H__ */

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// Copyright 2015-2016 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.
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <sys/lock.h>
#include "esp_attr.h"
#include "esp_flash_data_types.h"
#include "esp_spi_flash.h"
#include "esp_partition.h"
#include "esp_flash_encrypt.h"
#include "esp_log.h"
#ifndef NDEBUG
// Enable built-in checks in queue.h in debug builds
#define INVARIANTS
#endif
#include "rom/queue.h"
typedef struct partition_list_item_ {
esp_partition_t info;
SLIST_ENTRY(partition_list_item_) next;
} partition_list_item_t;
typedef struct esp_partition_iterator_opaque_ {
esp_partition_type_t type; // requested type
esp_partition_subtype_t subtype; // requested subtype
const char* label; // requested label (can be NULL)
partition_list_item_t* next_item; // next item to iterate to
esp_partition_t* info; // pointer to info (it is redundant, but makes code more readable)
} esp_partition_iterator_opaque_t;
static esp_partition_iterator_opaque_t* iterator_create(esp_partition_type_t type, esp_partition_subtype_t subtype, const char* label);
static esp_err_t load_partitions();
static SLIST_HEAD(partition_list_head_, partition_list_item_) s_partition_list =
SLIST_HEAD_INITIALIZER(s_partition_list);
static _lock_t s_partition_list_lock;
esp_partition_iterator_t esp_partition_find(esp_partition_type_t type,
esp_partition_subtype_t subtype, const char* label)
{
if (SLIST_EMPTY(&s_partition_list)) {
// only lock if list is empty (and check again after acquiring lock)
_lock_acquire(&s_partition_list_lock);
esp_err_t err = ESP_OK;
if (SLIST_EMPTY(&s_partition_list)) {
err = load_partitions();
}
_lock_release(&s_partition_list_lock);
if (err != ESP_OK) {
return NULL;
}
}
// create an iterator pointing to the start of the list
// (next item will be the first one)
esp_partition_iterator_t it = iterator_create(type, subtype, label);
// advance iterator to the next item which matches constraints
it = esp_partition_next(it);
// if nothing found, it == NULL and iterator has been released
return it;
}
esp_partition_iterator_t esp_partition_next(esp_partition_iterator_t it)
{
assert(it);
// iterator reached the end of linked list?
if (it->next_item == NULL) {
esp_partition_iterator_release(it);
return NULL;
}
_lock_acquire(&s_partition_list_lock);
for (; it->next_item != NULL; it->next_item = SLIST_NEXT(it->next_item, next)) {
esp_partition_t* p = &it->next_item->info;
if (it->type != p->type) {
continue;
}
if (it->subtype != 0xff && it->subtype != p->subtype) {
continue;
}
if (it->label != NULL && strcmp(it->label, p->label) != 0) {
continue;
}
// all constraints match, bail out
break;
}
_lock_release(&s_partition_list_lock);
if (it->next_item == NULL) {
esp_partition_iterator_release(it);
return NULL;
}
it->info = &it->next_item->info;
it->next_item = SLIST_NEXT(it->next_item, next);
return it;
}
const esp_partition_t* esp_partition_find_first(esp_partition_type_t type,
esp_partition_subtype_t subtype, const char* label)
{
esp_partition_iterator_t it = esp_partition_find(type, subtype, label);
if (it == NULL) {
return NULL;
}
const esp_partition_t* res = esp_partition_get(it);
esp_partition_iterator_release(it);
return res;
}
static esp_partition_iterator_opaque_t* iterator_create(esp_partition_type_t type,
esp_partition_subtype_t subtype, const char* label)
{
esp_partition_iterator_opaque_t* it =
(esp_partition_iterator_opaque_t*) malloc(sizeof(esp_partition_iterator_opaque_t));
it->type = type;
it->subtype = subtype;
it->label = label;
it->next_item = SLIST_FIRST(&s_partition_list);
it->info = NULL;
return it;
}
// Create linked list of partition_list_item_t structures.
// This function is called only once, with s_partition_list_lock taken.
static esp_err_t load_partitions()
{
const uint32_t* ptr;
spi_flash_mmap_handle_t handle;
// map 64kB block where partition table is located
esp_err_t err = spi_flash_mmap(ESP_PARTITION_TABLE_ADDR & 0xffff0000,
SPI_FLASH_SEC_SIZE, SPI_FLASH_MMAP_DATA, (const void**) &ptr, &handle);
if (err != ESP_OK) {
return err;
}
// calculate partition address within mmap-ed region
const esp_partition_info_t* it = (const esp_partition_info_t*)
(ptr + (ESP_PARTITION_TABLE_ADDR & 0xffff) / sizeof(*ptr));
const esp_partition_info_t* end = it + SPI_FLASH_SEC_SIZE / sizeof(*it);
// tail of the linked list of partitions
partition_list_item_t* last = NULL;
for (; it != end; ++it) {
if (it->magic != ESP_PARTITION_MAGIC) {
break;
}
// allocate new linked list item and populate it with data from partition table
partition_list_item_t* item = (partition_list_item_t*) malloc(sizeof(partition_list_item_t));
item->info.address = it->pos.offset;
item->info.size = it->pos.size;
item->info.type = it->type;
item->info.subtype = it->subtype;
item->info.encrypted = it->flags & PART_FLAG_ENCRYPTED;
if (esp_flash_encryption_enabled() && (
it->type == PART_TYPE_APP
|| (it->type == PART_TYPE_DATA && it->subtype == PART_SUBTYPE_DATA_OTA))) {
/* If encryption is turned on, all app partitions and OTA data
are always encrypted */
item->info.encrypted = true;
}
// it->label may not be zero-terminated
strncpy(item->info.label, (const char*) it->label, sizeof(it->label));
item->info.label[sizeof(it->label)] = 0;
// add it to the list
if (last == NULL) {
SLIST_INSERT_HEAD(&s_partition_list, item, next);
} else {
SLIST_INSERT_AFTER(last, item, next);
}
last = item;
}
spi_flash_munmap(handle);
return ESP_OK;
}
void esp_partition_iterator_release(esp_partition_iterator_t iterator)
{
// iterator == NULL is okay
free(iterator);
}
const esp_partition_t* esp_partition_get(esp_partition_iterator_t iterator)
{
assert(iterator != NULL);
return iterator->info;
}
const esp_partition_t *esp_partition_verify(const esp_partition_t *partition)
{
assert(partition != NULL);
const char *label = (strlen(partition->label) > 0) ? partition->label : NULL;
esp_partition_iterator_t it = esp_partition_find(partition->type,
partition->subtype,
label);
while (it != NULL) {
const esp_partition_t *p = esp_partition_get(it);
/* Can't memcmp() whole structure here as padding contents may be different */
if (p->address == partition->address
&& partition->size == p->size
&& partition->encrypted == p->encrypted) {
esp_partition_iterator_release(it);
return p;
}
it = esp_partition_next(it);
}
esp_partition_iterator_release(it);
return NULL;
}
esp_err_t esp_partition_read(const esp_partition_t* partition,
size_t src_offset, void* dst, size_t size)
{
assert(partition != NULL);
if (src_offset > partition->size) {
return ESP_ERR_INVALID_ARG;
}
if (src_offset + size > partition->size) {
return ESP_ERR_INVALID_SIZE;
}
if (!partition->encrypted) {
return spi_flash_read(partition->address + src_offset, dst, size);
} else {
/* Encrypted partitions need to be read via a cache mapping */
const void *buf;
spi_flash_mmap_handle_t handle;
esp_err_t err;
err = esp_partition_mmap(partition, src_offset, size,
SPI_FLASH_MMAP_DATA, &buf, &handle);
if (err != ESP_OK) {
return err;
}
memcpy(dst, buf, size);
spi_flash_munmap(handle);
return ESP_OK;
}
}
esp_err_t esp_partition_write(const esp_partition_t* partition,
size_t dst_offset, const void* src, size_t size)
{
assert(partition != NULL);
if (dst_offset > partition->size) {
return ESP_ERR_INVALID_ARG;
}
if (dst_offset + size > partition->size) {
return ESP_ERR_INVALID_SIZE;
}
dst_offset = partition->address + dst_offset;
if (partition->encrypted) {
return spi_flash_write_encrypted(dst_offset, src, size);
} else {
return spi_flash_write(dst_offset, src, size);
}
}
esp_err_t esp_partition_erase_range(const esp_partition_t* partition,
size_t start_addr, size_t size)
{
assert(partition != NULL);
if (start_addr > partition->size) {
return ESP_ERR_INVALID_ARG;
}
if (start_addr + size > partition->size) {
return ESP_ERR_INVALID_SIZE;
}
if (size % SPI_FLASH_SEC_SIZE != 0) {
return ESP_ERR_INVALID_SIZE;
}
if (start_addr % SPI_FLASH_SEC_SIZE != 0) {
return ESP_ERR_INVALID_ARG;
}
return spi_flash_erase_range(partition->address + start_addr, size);
}
/*
* Note: current implementation ignores the possibility of multiple regions in the same partition being
* mapped. Reference counting and address space re-use is delegated to spi_flash_mmap.
*
* If this becomes a performance issue (i.e. if we need to map multiple regions within the partition),
* we can add esp_partition_mmapv which will accept an array of offsets and sizes, and return array of
* mmaped pointers, and a single handle for all these regions.
*/
esp_err_t esp_partition_mmap(const esp_partition_t* partition, uint32_t offset, uint32_t size,
spi_flash_mmap_memory_t memory,
const void** out_ptr, spi_flash_mmap_handle_t* out_handle)
{
assert(partition != NULL);
if (offset > partition->size) {
return ESP_ERR_INVALID_ARG;
}
if (offset + size > partition->size) {
return ESP_ERR_INVALID_SIZE;
}
size_t phys_addr = partition->address + offset;
// offset within 64kB block
size_t region_offset = phys_addr & 0xffff;
size_t mmap_addr = phys_addr & 0xffff0000;
esp_err_t rc = spi_flash_mmap(mmap_addr, size+region_offset, memory, out_ptr, out_handle);
// adjust returned pointer to point to the correct offset
if (rc == ESP_OK) {
*out_ptr = (void*) (((ptrdiff_t) *out_ptr) + region_offset);
}
return rc;
}