ESP32 Forum

Posted: **Tue Jun 13, 2017 12:51 pm**

Example of using YModem protocol on ESP32
https://github.com/loboris/ESP32_ymodem_example

Features

Enables YModem protocol file transfer over UART
Send and receive functions included
Used terminal application must support ymodem file transfer. Tested with **minicom**

How to build

Configure your esp32 build environment as for esp-idf examples

Clone the repository

git clone https://github.com/loboris/ESP32_ymodem_example.git

Execute menuconfig and configure your Serial flash config and other settings. Included sdkconfig.defaults sets some defaults to be used.

Navigate to Ymodem example and set SPIFFS options.

Select if you want to use wifi (recommended) to get the time from NTP server and set your WiFi SSID and password.

Code: Select all

make menuconfig

Make and flash the example.

Code: Select all

make all && make flash

Prepare SPIFFS image

The example uses spiffs file system to receive and send files

The file system will be formated on first start, unless you flashed prepared spiffs image before the first start.

You can prepare SFPIFFS image and flash it to ESP32.

Files to be included on spiffs must be placed in components/spiffs_image/image/ directory. You can add or remove the files you want to include.

To create spiffs image in build directory without flashing to ESP32 execute:

Code: Select all

make makefs

Or, to create spiffs image in build directory and flash it to ESP32 execute:

Code: Select all

make flashfs

Or, to flash already prepared image components/spiffs_image/spiffs_image.img execute:

Code: Select all

make copyfs

Example output:

Code: Select all

I (1079) cpu_start: Pro cpu up.
I (1091) cpu_start: Starting app cpu, entry point is 0x40080f18
I (0) cpu_start: App cpu up.
I (1124) heap_alloc_caps: Initializing. RAM available for dynamic allocation:
I (1146) heap_alloc_caps: At 3FFAE2A0 len 00001D60 (7 KiB): DRAM
I (1167) heap_alloc_caps: At 3FFB7AD8 len 00028528 (161 KiB): DRAM
I (1188) heap_alloc_caps: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (1209) heap_alloc_caps: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (1231) heap_alloc_caps: At 40094980 len 0000B680 (45 KiB): IRAM
I (1252) cpu_start: Pro cpu start user code
I (1306) cpu_start: Starting scheduler on PRO CPU.
I (197) cpu_start: Starting scheduler on APP CPU.
I (197) uart: queue free spaces: 10
I (197) [Ymodem example]: Time is not set yet. Connecting to WiFi and getting time over NTP.
I (237) wifi: wifi firmware version: 9bf11be
I (237) wifi: config NVS flash: enabled
I (237) wifi: config nano formating: disabled
I (237) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (247) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (277) wifi: Init dynamic tx buffer num: 32
I (277) wifi: Init dynamic rx buffer num: 32
I (277) wifi: wifi driver task: 3ffc3194, prio:23, stack:4096
I (287) wifi: Init static rx buffer num: 10
I (287) wifi: Init dynamic rx buffer num: 32                                                                 
I (287) wifi: Init rx ampdu len mblock:7                                                                     
I (297) wifi: Init lldesc rx ampdu entry mblock:4                                                            
I (297) wifi: wifi power manager task: 0x3ffc855c prio: 21 stack: 2560                                       
I (307) [Ymodem example]: Setting WiFi configuration SSID LoBoInternet...                                    
I (317) wifi: wifi timer task: 3ffc95dc, prio:22, stack:3584                                                 
I (337) phy: phy_version: 355.0, 2888565, May 23 2017, 16:12:06, 1, 0                                        
I (337) wifi: mode : sta (24:0a:c4:00:97:c0)                                                                 
I (467) wifi: n:1 0, o:1 0, ap:255 255, sta:1 0, prof:1                                                      
I (1447) wifi: state: init -> auth (b0)                                                                      
I (1447) wifi: state: auth -> assoc (0)                                                                      
I (1447) wifi: state: assoc -> run (10)                                                                      
I (1487) wifi: connected with LoBoInternet, channel 1                                                        
I (3697) event: ip: 192.168.0.16, mask: 255.255.255.0, gw: 192.168.0.1                                       
I (3697) [Ymodem example]: Initializing SNTP                                                                 
I (4197) [Ymodem example]: System time is set.                                                               
I (4197) wifi: state: run -> init (0)                                                                        
I (4197) wifi: n:1 0, o:1 0, ap:255 255, sta:1 0, prof:1                                                     
E (4197) wifi: esp_wifi_connect 816 wifi not start                                                           
                                                                                                             
                                                                                                             
I (5197) [SPIFFS]: Registering SPIFFS file system                                                            
I (5197) [SPIFFS]: Mounting SPIFFS files system                                                              
I (5197) [SPIFFS]: Start address: 0x180000; Size 1024 KB                                                     
I (5197) [SPIFFS]:   Work buffer: 2048 B                                                                     
I (5207) [SPIFFS]:    FDS buffer: 384 B                                                                      
I (5207) [SPIFFS]:    Cache size: 2048 B                                                                     
I (5267) [SPIFFS]: Mounted                                                                                   
I (5267) [Ymodem example]: File system mounted.                                                              
Removed "/spiffs/yfile-1.bin"                                                                                
Removed "/spiffs/yfile-6.bin"                                                                                
LIST of DIR [/spiffs/]                                                                                       
T  Size      Date/Time         Name                                                                          
-----------------------------------                                                                          
d         -                    /spiffs                                                                       
d         -  12/06/2017 15:09  images                                                                        
d         -  12/06/2017 15:09  fonts                                                                         
f       405  12/06/2017 15:09  spiffs.info                                                                   
-----------------------------------                                                                          
        405 in 1 file(s)                                                                                     
-----------------------------------                                                                          
SPIFFS: free 776 KB of 957 KB                                                                                
                                                                                                             
                                                                                                             

Receiving file, please start YModem transfer on host ...                                                     
CCCCCCCCCCC
I (41427) [Ymodem example]: Transfer complete, Size=97543, orig name: "/spiffs/yfile-1.bin"
LIST of DIR [/spiffs/]
T  Size      Date/Time         Name
-----------------------------------
f     97543  13/06/2017 14:20  yfile-1.bin
-----------------------------------
      97543 in 1 file(s)
-----------------------------------
SPIFFS: free 680 KB of 957 KB

Sending file "/spiffs/yfile-1.bin", please start YModem receive on host ...
CCCCC
I (66667) [Ymodem example]: Transfer complete.

Posted: **Tue Jun 20, 2017 4:36 pm**

Thanks for the example ,

Requirement in one of my project is to flash from host silicon by supplied ".bin" instead of esptool.py or ESPFlashDownloader utility.
I can understand that ESP32 needs to be put in to download mode with required GPIOs like

- EN pin ("enable") pin was low and is pulled high.
- GPIO0 is held low on reset
(https://github.com/espressif/esptool/wi ... -Selection)

and write the image at location so that next boot would have flashed image booted.
I could not relate above steps in the repo code.

I used the git repo but could not achieve I wanted with some queries:

- Could not understand the spiffs why this is needed (It can have it's own benefits , but is it absolutely necessary?).
- The spiffs is not being used in the download tool as option.
- Is the example to prove ymodem protocol on ESP32 but not for flashing the new firmware (emulate esptool.py)
- If this is another way of flashing firmware , how the above requirement can be achieved.

rgds,
Shar_tkt

Posted: **Tue Jun 20, 2017 6:32 pm**

@shar_tkt

spiffs in this example is used only to demonstrate the usage of ymodem functions. The example is not written to demonstrate flashing the new firmware.
If you don't want to read/write from/to filesystem you should replace fread/fwrite functions in Ymodem_Receive/Ymodem_Transmit functions with another functions which reads/writes data to memory buffer or directly to flash partition. In that case you should pass (memory buffer) pointer to those functions instead of FILE *ffd.
You could also use esp_ota_write for firmware update.

If I'll find some time, I'll try to write an example of "OTW" (Over-the-wire) update, but not before the end of the month.

Posted: **Mon Aug 14, 2017 9:20 am**

If I understand correctly, the "make copyfs" is to flash an image previously created with "make makefs"?

Is this correct?

Posted: **Sun Aug 20, 2017 12:58 am**

Please ping me when you have the OTA working.

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