Update heapless dependency

[Luni-4]

Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo fmt command to ensure that all changed code is formatted correctly.
• I have used cargo clippy command to ensure that all changed code passes latest Clippy nightly lints.
• My changes were added to the CHANGELOG.md in the proper section.

Pull Request Details 📖

Description

This PR updates heapless to its latest version, in accordance with the request made by @ivmarkov in esp-rs/embedded-svc#86

[Luni-4]

It appears there are issues with aliased types, but I’m not sure how to fix them properly. Replacing all aliased types with the real ones?

[ivmarkov]

It appears there are issues with aliased types, but I’m not sure how to fix them properly. Replacing all aliased types with the real ones?

There are no such issues.
The issue at hand is that - as part of this PR - you need to patch embedded-svc and maybe esp-idf-hal as well to point to your PR branches.

[Luni-4]

@ivmarkov

Thanks for the help!

Would it be possible to merge the other PRs first and then apply the patch directly on their git version instead of using my branches?

[ivmarkov]

@ivmarkov

Thanks for the help!

Would it be possible to merge the other PRs first and then apply the patch directly on their git version instead of using my branches?

No. This would mean that for a while, esp-idf-svc will become unbuildable until this PR is merged.

Did you actually test your changes here in this PR somehow?

[Luni-4]

Sorry, I’m a bit confused.

If these two PRs, esp-rs/esp-idf-hal#571 and esp-rs/embedded-svc#86, are merged before this one, and then we patch emdedded-svc here, since esp-idf-hal is already there, or release a new embedded-svc version, what exactly can we break?

I can try to fix this PR using my personal branches to see if the ci passes, that's for sure, but I cannot use my branches as a stable solution. I feel like I’m missing something.

[ivmarkov]

The point is that I need to see a passing CI of this PR, even if this is temporarily against your branches. Once this is done and you could confirm that -say - one of the wifi examples works after your changes, we can remove the redirection to your personal branches and merge all 3 PRs in a rapid succession after each other.

[Luni-4]

The point is that I need to see a passing CI of this PR, even if this is temporarily against your branches. Once this is done and you could confirm that -say - one of the wifi examples works after your changes, we can remove the redirection to your personal branches and merge all 3 PRs in a rapid succession after each other.

That’s exactly what I needed to understand, thank you! Now it’s perfectly clear.

[Luni-4]

@ivmarkov

CI passes and below there's the output of the wifi.rs example

Output

Chip type:         esp32c3 (revision v0.4)
Crystal frequency: 40 MHz
Flash size:        4MB
Features:          WiFi, BLE
MAC address:       48:31:b7:3d:b6:84
Partition table:   partitions.csv
App/part. size:    1,927,744/3,145,728 bytes, 61.28%
[00:00:00] [========================================]      13/13      0x0
[00:00:00] [========================================]       1/1       0x8000
[00:00:15] [========================================]     907/907     0x10000 
[2026-02-26T16:15:36Z INFO ] Flashing has completed!
Commands:
    CTRL+R    Reset chip
    CTRL+C    Exit

ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x15 (USB_UART_CHIP_RESET),boot:0xd (SPI_FAST_FLASH_BOOT)
Saved PC:0x40380632
0x40380632 - spimem_flash_ll_sync_reset
    at /home/esp-idf-svc/.embuild/espressif/esp-idf/v5.4.2/components/hal/esp32c3/include/hal/spimem_flash_ll.h:694
SPIWP:0xee
mode:DIO, clock div:2
load:0x3fcd5820,len:0x1714
load:0x403cc710,len:0x968
load:0x403ce710,len:0x2f9c
entry 0x403cc710
I (19) boot: ESP-IDF v5.1.2-342-gbcf1645e44 2nd stage bootloader
I (20) boot: compile time Dec 12 2023 10:50:58
I (20) boot: chip revision: v0.4
I (24) boot.esp32c3: SPI Speed      : 40MHz
I (29) boot.esp32c3: SPI Mode       : DIO
I (34) boot.esp32c3: SPI Flash Size : 4MB
I (38) boot: Enabling RNG early entropy source...
I (44) boot: Partition Table:
I (47) boot: ## Label            Usage          Type ST Offset   Length
I (55) boot:  0 nvs              WiFi data        01 02 00009000 00006000
I (62) boot:  1 phy_init         RF data          01 01 0000f000 00001000
I (69) boot:  2 factory          factory app      00 00 00010000 00300000
I (77) boot: End of partition table
I (81) esp_image: segment 0: paddr=00010020 vaddr=3c180020 size=423e4h (271332) map
I (150) esp_image: segment 1: paddr=0005240c vaddr=3fc95a00 size=035dch ( 13788) load
I (153) esp_image: segment 2: paddr=000559f0 vaddr=40380000 size=0a628h ( 42536) load
I (166) esp_image: segment 3: paddr=00060020 vaddr=42000020 size=17b5fch (1553916) map
I (511) esp_image: segment 4: paddr=001db624 vaddr=4038a628 size=0b3c8h ( 46024) load
I (523) esp_image: segment 5: paddr=001e69f4 vaddr=50000000 size=0001ch (    28) load
I (530) boot: Loaded app from partition at offset 0x10000
I (530) boot: Disabling RNG early entropy source...
I (544) cpu_start: Unicore app
I (552) cpu_start: Pro cpu start user code
I (552) cpu_start: cpu freq: 160000000 Hz
I (553) app_init: Application information:
I (553) app_init: Project name:     libespidf
I (557) app_init: App version:      82bcb53-dirty
I (561) app_init: Compile time:     Feb 26 2026 17:14:53
I (566) app_init: ELF file SHA256:  000000000...
I (570) app_init: ESP-IDF:          v5.4.2
I (574) efuse_init: Min chip rev:     v0.3
I (578) efuse_init: Max chip rev:     v1.99
I (582) efuse_init: Chip rev:         v0.4
I (586) heap_init: Initializing. RAM available for dynamic allocation:
I (592) heap_init: At 3FCA37C0 len 0001C840 (114 KiB): RAM
I (597) heap_init: At 3FCC0000 len 0001C710 (113 KiB): Retention RAM
I (603) heap_init: At 3FCDC710 len 00002950 (10 KiB): Retention RAM
I (609) heap_init: At 5000001C len 00001FCC (7 KiB): RTCRAM
I (616) spi_flash: detected chip: generic
I (618) spi_flash: flash io: dio
W (622) i2c: This driver is an old driver, please migrate your application code to adapt `driver/i2c_master.h`
I (631) sleep_gpio: Configure to isolate all GPIO pins in sleep state
I (637) sleep_gpio: Enable automatic switching of GPIO sleep configuration
I (644) coexist: coex firmware version: 7b9a184
I (648) coexist: coexist rom version 9387209
I (653) main_task: Started on CPU0
I (653) main_task: Calling app_main()
I (663) pp: pp rom version: 9387209
I (663) net80211: net80211 rom version: 9387209
I (673) wifi:wifi driver task: 3fcb1670, prio:23, stack:6656, core=0
I (673) wifi:wifi firmware version: bea31f3
I (673) wifi:wifi certification version: v7.0
I (673) wifi:config NVS flash: enabled
I (683) wifi:config nano formatting: disabled
I (683) wifi:Init data frame dynamic rx buffer num: 32
I (693) wifi:Init static rx mgmt buffer num: 5
I (693) wifi:Init management short buffer num: 32
I (693) wifi:Init dynamic tx buffer num: 32
I (703) wifi:Init static tx FG buffer num: 2
I (703) wifi:Init static rx buffer size: 1600
I (713) wifi:Init static rx buffer num: 10
I (713) wifi:Init dynamic rx buffer num: 32
I (713) wifi_init: rx ba win: 6
I (723) wifi_init: accept mbox: 6
I (723) wifi_init: tcpip mbox: 32
I (723) wifi_init: udp mbox: 6
I (733) wifi_init: tcp mbox: 6
I (733) wifi_init: tcp tx win: 5760
I (733) wifi_init: tcp rx win: 5760
I (733) wifi_init: tcp mss: 1440
I (743) wifi_init: WiFi IRAM OP enabled
I (743) wifi_init: WiFi RX IRAM OP enabled
I (773) phy_init: phy_version 1201,bae5dd99,Mar  3 2025,15:36:21
W (773) phy_init: failed to load RF calibration data (0xffffffff), falling back to full calibration
I (813) phy_init: Saving new calibration data due to checksum failure or outdated calibration data, mode(2)
I (873) wifi:mode : sta (48:31:b7:3d:b6:84)
I (873) wifi:enable tsf
I (883) wifi: Wifi started
I (3293) wifi:new:<1,0>, old:<1,0>, ap:<255,255>, sta:<1,0>, prof:1, snd_ch_cfg:0x0
I (3303) wifi:state: init -> auth (0xb0)
I (3313) wifi:state: auth -> assoc (0x0)
I (3323) wifi:state: assoc -> run (0x10)
I (3363) wifi:connected with Secret, aid = 1, channel 1, BW20, bssid = 2c:3a:fd:cd:5b:54
I (3373) wifi:security: WPA2-PSK, phy: bgn, rssi: -45
I (3383) wifi:pm start, type: 1

I (3383) wifi:dp: 1, bi: 102400, li: 3, scale listen interval from 307200 us to 307200 us
I (3383) wifi:set rx beacon pti, rx_bcn_pti: 14, bcn_timeout: 25000, mt_pti: 14, mt_time: 10000
I (3403) wifi: Wifi connected
I (3403) wifi:<ba-add>idx:0 (ifx:0, 2c:3a:fd:cd:5b:54), tid:6, ssn:2, winSize:64
I (3413) wifi:AP's beacon interval = 102400 us, DTIM period = 1
I (4413) esp_netif_handlers: sta ip: 192.168.178.139, mask: 255.255.255.0, gw: 192.168.178.1
I (4413) wifi: Wifi netif up
I (4413) wifi: Wifi DHCP info: IpInfo { ip: 192.168.178.139, subnet: Subnet { gateway: 192.168.178.1, mask: Mask(24) }, dns: Some(192.168.178.1), secondary_dns: Some(0.0.0.0) }
I (4423) wifi: Shutting down in 5s...
I (9443) wifi:state: run -> init (0x0)
I (9453) wifi:pm stop, total sleep time: 5322438 us / 6066560 us

I (9453) wifi:<ba-del>idx:0, tid:6
I (9453) wifi:new:<1,0>, old:<1,0>, ap:<255,255>, sta:<1,0>, prof:1, snd_ch_cfg:0x0
I (9493) wifi:flush txq
I (9493) wifi:stop sw txq
I (9493) wifi:lmac stop hw txq
I (9493) esp_idf_svc::wifi: EspWifi dropped
I (9503) esp_idf_svc::netif: Dropped
I (9503) esp_idf_svc::netif: Dropped
I (9513) wifi:Deinit lldesc rx mblock:10
I (9523) esp_idf_svc::nvs: NvsDefault dropped
I (9533) esp_idf_svc::eventloop: System event loop dropped
I (9533) main_task: Returned from app_main()

[ivmarkov]

There is only one request - now that CI passes - to redirect back to the main GIT versions of esp-idf-hal and embedded-svc.

There are two minor change requests to the sibling PRs in embedded-svc and esp-idf-hal. Once you do the change request to the two sibling PRs and the one here, I'll merge all three in a rapid sequence.

Thanks again (and sorry for the delay)!

[Luni-4]

There is only one request - now that CI passes - to redirect back to the main GIT versions of esp-idf-hal and embedded-svc.

There are two minor change requests to the sibling PRs in embedded-svc and esp-idf-hal. Once you do the change request to the two sibling PRs and the one here, I'll merge all three in a rapid sequence.

Done. Seems a good plan, thanks!

Thanks again (and sorry for the delay)!

Do not worry for the delay, thanks to you for your help!