ESP32 ESP-IDF 开发常用jira--持续更新
1. ESP-IDF v2.x 升级到 v3.x的一些有趣现象
1.1 AP模式下，在v3.x后，.ssid_len参数必须严格按照AP_SSID字符个数给出，不然会出现实际运行时SSID和软件配置不匹配情况，而在v2.x版本下，.ssid_len设置为0也运行正常。
wifi_config_t ap_config = {
.ap = {
.ssid = EXAMPLE_DEFAULT_AP_SSID,
.password = EXAMPLE_DEFAULT_AP_PWD,
.ssid_len = 7,
.max_connection = 1,
.authmode = WIFI_AUTH_WPA_WPA2_PSK
}
};1.2 STA模式下，在v2.x版本时，当软件STA配置时设置了密码，而外界WIFI路由器在不设置密码情况下，ESP32依然可以连上外界WIFI，但是在v3.x版本时，这种情况不会出现，软件STA配置必须和外部WIFI路由器配置一致时，才可以连上。
2. 串口乱码问题
ESP32的信息打印串口需要接三条信号TXD、RXD、GND，现在大部分都是用USB转TTL接调试，若GND信号线没有可靠的连接到ESP32板子上，电脑上串口接收软件在某些情况下可能会出现接收到乱码情况，给问题排查带来不便。当然，不接GND信号大部分情况下电脑串口软件是接收不到任何信息的。
附上ESP32开机打印信息摘要如下：
ets Jun 8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun 8 2016 00:22:57
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:6348
load:0x40078000,len:11308
ho 0 tail 12 room 4
load:0x40080400,len:6272
entry 0x4008073c
[0;32mI (31) boot: ESP-IDF v3.3-beta3-dirty 2nd stage bootloader[0m
[0;32mI (31) boot: compile time 11:57:58[0m
[0;32mI (31) boot: Enabling RNG early entropy source...[0m
[0;32mI (36) boot: SPI Speed : 40MHz[0m
[0;32mI (40) boot: SPI Mode : DIO[0m
[0;32mI (44) boot: SPI Flash Size : 4MB[0m
[0;32mI (48) boot: Partition Table:[0m
[0;32mI (52) boot: ## Label Usage Type ST Offset Length[0m
[0;32mI (59) boot: 0 nvs WiFi data 01 02 00009000 00004000[0m
[0;32mI (67) boot: 1 otadata OTA data 01 00 0000d000 00002000[0m
[0;32mI (74) boot: 2 phy_init RF data 01 01 0000f000 00001000[0m
[0;32mI (82) boot: 3 factory factory app 00 00 00010000 00100000[0m
[0;32mI (89) boot: 4 ota_0 OTA app 00 10 00110000 00100000[0m
[0;32mI (97) boot: 5 ota_1 OTA app 00 11 00210000 00100000[0m
[0;32mI (104) boot: End of partition table[0m
[0;32mI (108) esp_image: segment 0: paddr=0x00110020 vaddr=0x3f400020 size=0x1bca0 (113824) map[0m
[0;32mI (157) esp_image: segment 1: paddr=0x0012bcc8 vaddr=0x3ffb0000 size=0x03014 ( 12308) load[0m
[0;32mI (162) esp_image: segment 2: paddr=0x0012ece4 vaddr=0x40080000 size=0x00400 ( 1024) load[0m
[0;32mI (164) esp_image: segment 3: paddr=0x0012f0ec vaddr=0x40080400 size=0x00f24 ( 3876) load[0m
[0;32mI (174) esp_image: segment 4: paddr=0x00130018 vaddr=0x400d0018 size=0x6d88c (448652) map[0m
[0;32mI (339) esp_image: segment 5: paddr=0x0019d8ac vaddr=0x40081324 size=0x0ee2c ( 60972) load[0m
[0;32mI (374) boot: Loaded app from partition at offset 0x110000[0m
[0;32mI (374) boot: Disabling RNG early entropy source...[0m
[0;32mI (375) cpu_start: Pro cpu up.[0m
[0;32mI (378) cpu_start: Application information:[0m
[0;32mI (383) cpu_start: Project name: waw[0m
[0;32mI (388) cpu_start: App version: 1[0m
[0;32mI (392) cpu_start: Compile time: Jun 13 2019 11:58:12[0m
[0;32mI (398) cpu_start: ELF file SHA256: 47a4891939ad6350...[0m
[0;32mI (404) cpu_start: ESP-IDF: v3.3-beta3-dirty[0m
[0;32mI (410) cpu_start: Starting app cpu, entry point is 0x400810c8[0m
[0;32mI (0) cpu_start: App cpu up.[0m
[0;32mI (420) heap_init: Initializing. RAM available for dynamic allocation:[0m
[0;32mI (427) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM[0m
[0;32mI (433) heap_init: At 3FFB9DC0 len 00026240 (152 KiB): DRAM[0m
[0;32mI (439) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM[0m
[0;32mI (446) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM[0m
[0;32mI (452) heap_init: At 40090150 len 0000FEB0 (63 KiB): IRAM[0m
[0;32mI (458) cpu_start: Pro cpu start user code[0m
[0;32mI (141) cpu_start: Starting scheduler on PRO CPU.[0m
[0;32mI (0) cpu_start: Starting scheduler on APP CPU.[0m
[0;32mI (204) NVS_Storage:: test sys ota config Succeed Read nUpdateAckCount= 22 nOTAStatus = 0[0m
I (214) wifi: wifi driver task: 3ffc15b0, prio:23, stack:3584, core=0
I (214) wifi: wifi firmware version: 7240fb7
I (214) wifi: config NVS flash: enabled
I (214) wifi: config nano formating: disabled
[0;32mI (224) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE[0m
[0;32mI (234) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE[0m
I (264) wifi: Init dynamic tx buffer num: 32
I (264) wifi: Init data frame dynamic rx buffer num: 32
I (264) wifi: Init management frame dynamic rx buffer num: 32
I (264) wifi: Init management short buffer num: 32
I (264) wifi: Init static rx buffer size: 1600
I (274) wifi: Init static rx buffer num: 10
I (274) wifi: Init dynamic rx buffer num: 32
[0;32mI (1354) phy: phy_version: 4100, 2a5dd04, Jan 23 2019, 21:00:07, 0, 0[0m
I (1354) wifi: mode : sta (30:ae:a4:00:1f:4c) + softAP (30:ae:a4:00:1f:4d)
I (1364) wifi: Total power save buffer number: 16
I (1364) wifi: Init max length of beacon: 752/752
I (1364) wifi: Init max length of beacon: 752/752
[0;32mI (1374) udp_server:: task udp_conn start.[0m
[0;32mI (1374) wifi_init:: event_handler:SYSTEM_EVENT_STA_START