usb/cdc: Better ring buffer implementation by soypat · Pull Request #5209 · tinygo-org/tinygo

soypat · 2026-02-19T15:57:22Z

Makes USBCDC ring buffers respect single-producer, single-consumer pattern in the spirit of the original algorithm, which almost got it right.

add cdc.ring512 implementation
Use atomic package instead of volatile to ensure ISR/concurrent access works reliably
Add better buffer ownership model using Peek/Discard to ensure the buffer is not overwritten by receive ISR during transmit
Add ring512 tests including fuzz tests with tens of millions of runs in single threaded conditions
Single implementation for both tx and rx now
Remove for loops within ring buffer writing/reading, use copy instead

Trying to fix #5188 I noticed that improving USBCDC implementation may not be enough, looks like the machine package for RP2 targets plays a very important role since it holds on to the buffer after machine.SendUSBInPacket(cdcEndpointIn, chunk) is called. This leaves callers in the dark of when the buffer space can be reused. The design of the machine USB package seems to be flawed in design if reliable data transmission is a priority, at least in the RP2 targets. Not yet sure how this can be solved.

github-actions · 2026-02-19T16:15:09Z

Size difference with the dev branch:

Binary size difference

 flash                          ram
 before   after   diff          before   after   diff
 388532  388384   -148  -0.04%   18824   19180    356   1.89% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
 338328  338244    -84  -0.02%   21908   22264    356   1.62% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
 120148  120076    -72  -0.06%   11916   12276    360   3.02% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2350 -stack-size 8kb ./examples/net/ntpclient/
  66780   66712    -68  -0.10%    9000    9356    356   3.96% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/flash/console/qspi
 103364  103332    -32  -0.03%   10052   10408    356   3.54% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
  73764   73760     -4  -0.01%   10736   11092    356   3.32% tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/sdcard/console/
   7356    7356      0   0.00%    2296    2296      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/at24cx/main.go
  71412   71412      0   0.00%    3640    3640      0   0.00% tinygo build -size short -o ./build/test.hex -target=pinetime     ./examples/bma42x/main.go
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   7068    7068      0   0.00%    2260    2260      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/gc9a01/main.go
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   5568    5568      0   0.00%    2256    2256      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hd44780/text/main.go
  15980   15980      0   0.00%    2340    2340      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hub75/main.go
  26188   26188      0   0.00%    2304    2304      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/lsm303agr/main.go
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   5100    5100      0   0.00%    8862    8862      0   0.00% '-xesppie' is not a recognized feature for this target (ignoring feature)
   1853    1853      0   0.00%     600     600      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino   ./examples/ws2812
   1328    1328      0   0.00%     182     182      0   0.00% tinygo build -size short -o ./build/test.hex -target=digispark ./examples/ws2812
   7244    7244      0   0.00%    3308    3308      0   0.00% tinygo build -size short -o ./build/test.hex -target=nucleo-f103rb ./examples/shiftregister/main.go
   7020    7020      0   0.00%    2248    2248      0   0.00% '-xesppie' is not a recognized feature for this target (ignoring feature)
   9232    9232      0   0.00%    5232    5232      0   0.00% tinygo build -size short -o ./build/test.hex -target=nucleo-l432kc ./examples/aht20/main.go
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 308548  308552      4   0.00%   15972   16332    360   2.25% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
 155740  155752     12   0.01%    8852    9208    356   4.02% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
 347192  347208     16   0.00%   16804   17164    360   2.14% tinygo build -size short -o ./build/test.hex -target=pyportal -stack-size 8kb ./examples/net/http-get/
 263600  263644     44   0.02%   46752   47108    356   0.76% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/slideshow
 116544  116588     44   0.04%   13348   13704    356   2.67% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
  11952   12004     52   0.44%    4532    4900    368   8.12% tinygo build -size short -o ./build/test.uf2 -target=nicenano ./examples/sharpmem/main.go
  11312   11372     60   0.53%    6560    6928    368   5.61% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go
  14188   14248     60   0.42%    6560    6928    368   5.61% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/hts221/main.go
  13572   13632     60   0.44%    6560    6928    368   5.61% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/lps22hb/main.go
  24508   24568     60   0.24%   13708   14076    368   2.68% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840-sense ./examples/waveshare-epd/epd1in54/main.go
   9572    9640     68   0.71%    4520    4880    360   7.96% tinygo build -size short -o ./build/test.hex -target=circuitplay-bluefruit ./examples/tone
  88064   88140     76   0.09%    7236    7592    356   4.92% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
  12240   12320     80   0.65%    8352    8712    360   4.31% tinygo build -size short -o ./build/test.hex -target=xiao-ble ./examples/ssd1306/
 338388  338476     88   0.03%   21788   22148    360   1.65% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
  62740   62852    112   0.18%    5928    6296    368   6.21% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840 ./examples/is31fl3731/main.go
  24836   24972    136   0.55%    5384    5752    368   6.84% tinygo build -size short -o ./build/test.hex -target=metro-rp2350 ./examples/bno08x/i2c/main.go
 119764  119920    156   0.13%    8072    8428    356   4.41% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
  62256   62424    168   0.27%    5964    6332    368   6.17% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840 ./examples/max6675/main.go
 174564  174740    176   0.10%   13888   14240    352   2.53% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2040 -stack-size 8kb ./examples/net/tlsclient/
  13060   13240    180   1.38%    6776    7136    360   5.31% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx
   8632    8816    184   2.13%    6760    7128    368   5.44% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/fourwire/main.go
  12164   12348    184   1.51%    6956    7324    368   5.29% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/pyportal_touchpaint/main.go
  29248   29436    188   0.64%   38056   38424    368   0.97% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/pyportal_boing
  61804   61996    192   0.31%    8208    8576    368   4.48% tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/i2csoft/adt7410/
  13756   13960    204   1.48%    5396    5764    368   6.82% tinygo build -size short -o ./build/test.hex -target=badger2040 ./examples/uc8151/main.go
 166148  166356    208   0.13%   10040   10400    360   3.59% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
  27612   27860    248   0.90%    6808    7168    360   5.29% tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/lsm303dlhc/main.go
  17536   17796    260   1.48%    6992    7348    356   5.09% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/as560x/main.go
  14776   15040    264   1.79%    5328    5696    368   6.91% tinygo build -size short -o ./build/test.hex -target=pico ./examples/tmc5160/main.go
  27908   28176    268   0.96%   18456   18824    368   1.99% tinygo build -size short -o ./build/test.hex -target=pico ./examples/waveshare-epd/epd2in66b/main.go
  43976   44248    272   0.62%    7192    7552    360   5.01% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/tmc2209/main.go
   9876   10156    280   2.84%    6896    7264    368   5.34% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic
   9908   10188    280   2.83%    6896    7256    360   5.22% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/scroll
   7704    7988    284   3.69%    6768    7128    360   5.32% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/shifter/main.go
   9876   10160    284   2.88%    6768    7128    360   5.32% tinygo build -size short -o ./build/test.elf -target=wioterminal ./examples/axp192/m5stack-core2-blinky/
  67364   67652    288   0.43%    6340    6700    360   5.68% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/i2c/main.go
  13724   14016    292   2.13%    5396    5764    368   6.82% tinygo build -size short -o ./build/test.hex -target=pico ./examples/pca9685/main.go
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  11332   11628    296   2.61%    5340    5708    368   6.89% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/mpu6886/main.go
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   8664    8984    320   3.69%    4752    5120    368   7.74% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017/main.go
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soypat added 3 commits February 19, 2026 11:10

begin adding ring512 implementation

2f08dae

refactor to make operation driven fuzz test

67700b4

refactor USBCDC.Read to use ring512

7e75a62

soypat added 2 commits February 19, 2026 15:04

try txhandler separate to flush

4fd607a

working USBCDC with large packets

d20322d

This was referenced Feb 19, 2026

Pico W and Pico 2W "slice out of range" tinygo-org/bluetooth#381

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proposal: spec: generic parameterization of array sizes golang/go#44253

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usb/cdc: Better ring buffer implementation #5209

usb/cdc: Better ring buffer implementation #5209
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soypat commented Feb 19, 2026

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github-actions bot commented Feb 19, 2026 •

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