esp32c2/esp8464 wifi example connecting AP fails (IDFGH-10456)

[Liming-Wang]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v5.0.1, v5.0.2

Operating System used.

Linux

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

None

Development Kit.

ESP8684-DevKit M-1 v1.1

Power Supply used.

USB

What is the expected behavior?

when I supply the correct SSID and password, the example code should connect to the AP successfully. (I've tested the same AP with a ESP32 DevKit, and it works)

What is the actual behavior?

The device fails to connect to the AP.

Steps to reproduce.

1. Go to idf5.0.1/idf5.0.2 folder
2. . ./export.sh
3. cd examples/wifi/getting_started/station/
4. idf.py set-target esp32c2
5. idf.py menuconfig # configure ssid and password
6. idf.py flash
7. idf.py -b 74800 monitor

Debug Logs.

--- idf_monitor on /dev/ttyUSB1 74800 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
ESP-ROM:esp8684-api2-20220127
Build:Jan 27 2022
rst:0x1 (POWERON),boot:0xc (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd5c80,len:0x1658
load:0x403acb70,len:0x968
load:0x403aeb70,len:0x27d8
entry 0x403acb70
I (21) boot: ESP-IDF v5.0.2 2nd stage bootloader
I (21) boot: compile time 21:04:37
I (21) boot: chip revision: v1.0
I (23) boot.esp32c2: MMU Page Size  : 32K
I (27) boot.esp32c2: SPI Speed      : 60MHz
I (32) boot.esp32c2: SPI Mode       : DIO
I (37) boot.esp32c2: SPI Flash Size : 2MB
I (42) boot: Enabling RNG early entropy source...
I (47) boot: Partition Table:
I (51) boot: ## Label            Usage          Type ST Offset   Length
I (58) boot:  0 nvs              WiFi data        01 02 00009000 00006000
I (66) boot:  1 phy_init         RF data          01 01 0000f000 00001000
I (73) boot:  2 factory          factory app      00 00 00010000 00100000
I (80) boot: End of partition table
I (85) esp_image: segment 0: paddr=00010020 vaddr=3c068020 size=1c938h (117048) map
I (119) esp_image: segment 1: paddr=0002c960 vaddr=3fcab3f0 size=01f94h (  8084) load
I (122) esp_image: segment 2: paddr=0002e8fc vaddr=40380000 size=0171ch (  5916) load
I (127) esp_image: segment 3: paddr=00030020 vaddr=42000020 size=67824h (423972) map
I (228) esp_image: segment 4: paddr=0009784c vaddr=4038171c size=09cd0h ( 40144) load
I (242) boot: Loaded app from partition at offset 0x10000
I (243) boot: Disabling RNG early entropy source...
I (254) cpu_start: Pro cpu up.
I (263) cpu_start: Pro cpu start user code
I (263) cpu_start: cpu freq: 120000000 Hz
I (263) cpu_start: Application information:
I (266) cpu_start: Project name:     wifi_station
I (271) cpu_start: App version:      1
I (276) cpu_start: Compile time:     Jun 19 2023 21:04:35
I (282) cpu_start: ELF file SHA256:  226ac53b61a5d9ad...
I (288) cpu_start: ESP-IDF:          v5.0.2
I (293) cpu_start: Min chip rev:     v1.0
I (297) cpu_start: Max chip rev:     v1.99 
I (302) cpu_start: Chip rev:         v1.0
I (307) heap_init: Initializing. RAM available for dynamic allocation:
I (314) heap_init: At 3FCB0FD0 len 0002BBA0 (174 KiB): D/IRAM
I (321) heap_init: At 3FCDCB70 len 0000294C (10 KiB): STACK/DRAM
I (328) spi_flash: detected chip: gd
I (332) spi_flash: flash io: dio
W (336) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (349) cpu_start: Starting scheduler.
I (363) wifi station: ESP_WIFI_MODE_STA
I (373) pp: pp rom version: de8c800
I (373) net80211: net80211 rom version: de8c800
I (383) wifi:wifi driver task: 3fcb72cc, prio:23, stack:6144, core=0
I (383) system_api: Base MAC address is not set
I (383) system_api: read default base MAC address from EFUSE
I (393) wifi:wifi firmware version: 57982fe
I (393) wifi:wifi certification version: v7.0
I (393) wifi:config NVS flash: enabled
I (403) wifi:config nano formating: enabled
I (403) wifi:Init data frame dynamic rx buffer num: 32
I (413) wifi:Init management frame dynamic rx buffer num: 32
I (413) wifi:Init management short buffer num: 32
I (423) wifi:Init dynamic tx buffer num: 32
I (423) wifi:Init static tx FG buffer num: 2
I (423) wifi:Init static rx buffer size: 1600
I (433) wifi:Init static rx buffer num: 10
I (433) wifi:Init dynamic rx buffer num: 32
I (443) wifi_init: rx ba win: 6
I (443) wifi_init: tcpip mbox: 32
I (443) wifi_init: udp mbox: 6
I (453) wifi_init: tcp mbox: 6
I (453) wifi_init: tcp tx win: 5744
I (463) wifi_init: tcp rx win: 5744
I (463) wifi_init: tcp mss: 1440
I (463) wifi_init: WiFi IRAM OP enabled
I (473) wifi_init: WiFi RX IRAM OP enabled
I (493) phy_init: phy_version 210,e134770,Oct 20 2022,15:26:13
I (523) wifi:mode : sta (08:3a:8d:41:12:ac)
I (523) wifi:enable tsf
I (523) wifi station: wifi_init_sta finished.
I (2933) wifi station: retry to connect to the AP
I (2933) wifi station: connect to the AP fail
I (5343) wifi station: retry to connect to the AP
I (5343) wifi station: connect to the AP fail
I (7753) wifi station: retry to connect to the AP
I (7753) wifi station: connect to the AP fail
I (10163) wifi station: retry to connect to the AP
I (10163) wifi station: connect to the AP fail
I (12563) wifi station: retry to connect to the AP
I (12573) wifi station: connect to the AP fail
I (14973) wifi station: connect to the AP fail
I (14973) wifi station: Failed to connect to SSID:MyAP, password:myAPpassword

More Information.

No response

[igrr]

Please try the suggestion here: #10782 (comment)

Looks like your board is using a 26 MHz XTAL. If you set the XTAL to 26 MHz in menuconfig, then Wi-Fi will work correctly and you also won't need to set the baud rate to 74800 when running idf.py monitor.

[Liming-Wang]

Thanks @igrr , it works following you advice! It would be nice to have it noted in some README file. I guess it is a common issue people may encountered with esp32c2.

[igrr]

I think we have a mention of this in the Getting Started guide for the ESP32-C2: https://docs.espressif.com/projects/esp-idf/en/latest/esp32c2/get-started/linux-macos-setup.html#monitor-the-output. We can also add this to the README of the Wi-Fi station example (examples/wifi/getting_started/station/README.md).

[Liming-Wang]

@igrr Thanks for the reference link. I had once read the getting-started guide for esp32, and I recently switched to esp32c2 developement, so I did not check that document carefully. It does resolve the monitor garbage characters problem, but it does not mention the wifi problem, actually, I just found out without changing the xtal frequency, bluetooth won't work either. So far as I know, this parameter update is needed for wifi or bluetooth to work properly.

Thanks again for the reply!

[catalineacsu]

I had the same issue. Changing the speed to 26MHz solved my problem. UART stayed at 74880 for some apps though.