本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。
# 在 Espressif 上安装固件的初始版本 ESP32
**重要**
该参考集成托管在已弃用的 Amazon-FreeRTOS 存储库中。当您创建新项目时，我们建议[从此处开始](freertos-getting-started-modular.md)。如果您已经有一个基于现已弃用的 Amazon-FreeRTOS 存储库的 FreeRTOS 项目，请参阅 [Amazon-FreeRTOS Github 存储库迁移指南](github-repo-migration.md)。
[本指南假设您已经执行了 [Espressif ESP32-DevKit C 入门中的步骤，以及更新先决 ESP-WROVER-KIT](https://docs.aws.amazon.com/freertos/latest/userguide/getting_started_espressif.html)条件。Over-the-Air ](https://docs.aws.amazon.com/freertos/latest/userguide/ota-prereqs.html)在尝试 OTA 更新之前，可能需要运行 [FreeRTOS 入门](https://docs.aws.amazon.com/freertos/latest/userguide/freertos-getting-started.html)中所述的 MQTT 演示项目，以确保主板和工具链设置正确。
**将初始出厂映像刷写到主板**
1. 打开 `{{freertos}}/vendors/{{vendor}}/boards/{{board}}/aws_demos/config_files/aws_demo_config.h`，注释掉 `#define CONFIG_CORE_MQTT_MUTUAL_AUTH_DEMO_ENABLED` 并定义 `CONFIG_OTA_MQTT_UPDATE_DEMO_ENABLED` 或 `CONFIG_OTA_HTTP_UPDATE_DEMO_ENABLED`。
1. 将 [OTA 更新先决条件](ota-prereqs.md) 中生成的 SHA-256/ECDSA PEM 格式的代码签名证书复制到 `vendors/{{vendor}}/boards/{{board}}/aws_demos/config_files/ota_demo_config.h`。应按以下方式为其设置格式。
```
#define otapalconfigCODE_SIGNING_CERTIFICATE \
"-----BEGIN CERTIFICATE-----\n" \
"...base64 data...\n" \
"-----END CERTIFICATE-----\n";
```
1. 选择 OTA Update 演示后，按照[入门中概述的 ESP32](https://docs.aws.amazon.com/freertos/latest/userguide/getting_started_espressif.html)相同步骤构建和刷新映像。如果之前已构建并刷写了项目，则可能需要先运行 `make clean`。在运行 `make flash monitor` 后，将会看到类似于以下内容的输出。某些消息的顺序可能会有所不同，因为演示应用程序同时运行多个任务。
```
I (28) boot: ESP-IDF v3.1-dev-322-gf307f41-dirty 2nd stage bootloader
I (28) boot: compile time 16:32:33
I (29) boot: Enabling RNG early entropy source...
I (34) boot: SPI Speed : 40MHz
I (38) boot: SPI Mode : DIO
I (42) boot: SPI Flash Size : 4MB
I (46) boot: Partition Table:
I (50) boot: ## Label Usage Type ST Offset Length
I (57) boot: 0 nvs WiFi data 01 02 00010000 00006000
I (64) boot: 1 otadata OTA data 01 00 00016000 00002000
I (72) boot: 2 phy_init RF data 01 01 00018000 00001000
I (79) boot: 3 ota_0 OTA app 00 10 00020000 00100000
I (87) boot: 4 ota_1 OTA app 00 11 00120000 00100000
I (94) boot: 5 storage Unknown data 01 82 00220000 00010000
I (102) boot: End of partition table
I (106) esp_image: segment 0: paddr=0x00020020 vaddr=0x3f400020 size=0x14784 ( 83844) map
I (144) esp_image: segment 1: paddr=0x000347ac vaddr=0x3ffb0000 size=0x023ec ( 9196) load
I (148) esp_image: segment 2: paddr=0x00036ba0 vaddr=0x40080000 size=0x00400 ( 1024) load
I (151) esp_image: segment 3: paddr=0x00036fa8 vaddr=0x40080400 size=0x09068 ( 36968) load
I (175) esp_image: segment 4: paddr=0x00040018 vaddr=0x400d0018 size=0x719b8 (465336) map
I (337) esp_image: segment 5: paddr=0x000b19d8 vaddr=0x40089468 size=0x04934 ( 18740) load
I (345) esp_image: segment 6: paddr=0x000b6314 vaddr=0x400c0000 size=0x00000 ( 0) load
I (353) boot: Loaded app from partition at offset 0x20000
I (353) boot: ota rollback check done
I (354) boot: Disabling RNG early entropy source...
I (360) cpu_start: Pro cpu up.
I (363) cpu_start: Single core mode
I (368) heap_init: Initializing. RAM available for dynamic allocation:
I (375) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (381) heap_init: At 3FFC0748 len 0001F8B8 (126 KiB): DRAM
I (387) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (393) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (400) heap_init: At 4008DD9C len 00012264 (72 KiB): IRAM
I (406) cpu_start: Pro cpu start user code
I (88) cpu_start: Starting scheduler on PRO CPU.
I (113) wifi: wifi firmware version: f79168c
I (113) wifi: config NVS flash: enabled
I (113) wifi: config nano formating: disabled
I (113) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (123) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (133) wifi: Init dynamic tx buffer num: 32
I (143) wifi: Init data frame dynamic rx buffer num: 32
I (143) wifi: Init management frame dynamic rx buffer num: 32
I (143) wifi: wifi driver task: 3ffc73ec, prio:23, stack:4096
I (153) wifi: Init static rx buffer num: 10
I (153) wifi: Init dynamic rx buffer num: 32
I (163) wifi: wifi power manager task: 0x3ffcc028 prio: 21 stack: 2560
0 6 [main] WiFi module initialized. Connecting to AP ...
I (233) phy: phy_version: 383.0, 79a622c, Jan 30 2018, 15:38:06, 0, 0
I (233) wifi: mode : sta (30:ae:a4:80:0a:04)
I (233) WIFI: SYSTEM_EVENT_STA_START
I (363) wifi: n:1 0, o:1 0, ap:255 255, sta:1 0, prof:1
I (1343) wifi: state: init -> auth (b0)
I (1343) wifi: state: auth -> assoc (0)
I (1353) wifi: state: assoc -> run (10)
I (1373) wifi: connected with , channel 1
I (1373) WIFI: SYSTEM_EVENT_STA_CONNECTED
1 302 [IP-task] vDHCPProcess: offer c0a86c13ip
I (3123) event: sta ip: 192.168.108.19, mask: 255.255.224.0, gw: 192.168.96.1
I (3123) WIFI: SYSTEM_EVENT_STA_GOT_IP
2 302 [IP-task] vDHCPProcess: offer c0a86c13ip
3 303 [main] WiFi Connected to AP. Creating tasks which use network...
4 304 [OTA] OTA demo version 0.9.6
5 304 [OTA] Creating MQTT Client...
6 304 [OTA] Connecting to broker...
I (4353) wifi: pm start, type:0
I (8173) PKCS11: Initializing SPIFFS
I (8183) PKCS11: Partition size: total: 52961, used: 0
7 1277 [OTA] Connected to broker.
8 1280 [OTA Task] [prvSubscribeToJobNotificationTopics] OK: $aws/things//jobs/$next/get/accepted
I (12963) ota_pal: prvPAL_GetPlatformImageState
I (12963) esp_ota_ops: [0] aflags/seq:0x2/0x1, pflags/seq:0xffffffff/0x0
9 1285 [OTA Task] [prvSubscribeToJobNotificationTopics] OK: $aws/things//jobs/notify-next
10 1286 [OTA Task] [OTA_CheckForUpdate] Request #0
11 1289 [OTA Task] [prvParseJSONbyModel] Extracted parameter [ clientToken: 0: ]
12 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: execution
13 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: jobId
14 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: jobDocument
15 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: afr_ota
16 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: streamname
17 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: files
18 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: filepath
19 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: filesize
20 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: fileid
21 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: certfile
22 1289 [OTA Task] [prvParseJSONbyModel] parameter not present: sig-sha256-ecdsa
23 1289 [OTA Task] [prvParseJobDoc] Ignoring job without ID.
24 1289 [OTA Task] [prvOTA_Close] Context->0x3ffbb4a8
25 1290 [OTA] [OTA_AgentInit] Ready.
26 1390 [OTA] State: Ready Received: 1 Queued: 1 Processed: 1 Dropped: 0
27 1490 [OTA] State: Ready Received: 1 Queued: 1 Processed: 1 Dropped: 0
28 1590 [OTA] State: Ready Received: 1 Queued: 1 Processed: 1 Dropped: 0
29 1690 [OTA] State: Ready Received: 1 Queued: 1 Processed: 1 Dropped: 0
[ ... ]
```
1. ESP32 董事会现在正在监听 OTA 更新。ESP-IDF 监视器通过 `make flash monitor` 命令启动。您可以按 **Ctrl\+]** 以退出。您也可以使用最中意的 TTY 终端程序（例如，PuTTY、Tera Term 或 GNU Screen）来侦听主板的串行输出。请注意，连接到主板的串行端口可能会导致主板重新启动。