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machine/esp32xx: clear the I2C bus with a GPIO STOP when configuring - #5783
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Without a bus clear, an MPU-6050 on a XIAO ESP32-C3 NACKs the first transaction after a chip reset. This does the same as the software i2c_master_clear_bus in ESP-IDF v4.4.8. SCL is clocked while SDA is held low, then a STOP is sent with the pins as GPIOs.
Contributor
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Thanks for the fix, @deadprogram! Tested this PR on an ESP32-S3 (LILYGO T5-4.7-S3) with a GT911 at 0x5D and a PCF8563 at 0x51 on I2C0 at 400 kHz, using only
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Size difference with the dev branch: Binary size differenceflash ram before after diff before after diff 19884 19884 0 0.00% 7060 7060 0 0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650 63316 63316 0 0.00% 6860 6860 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go 11300 11300 0 0.00% 5412 5412 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adxl345/main.go 15460 15460 0 0.00% 7468 7468 0 0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx 10516 10516 0 0.00% 5372 5372 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go 13188 13188 0 0.00% 7204 7204 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go 12720 12720 0 0.00% 5384 5384 0 0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 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./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/ 358188 358188 0 0.00% 13552 13552 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/ 108192 108192 0 0.00% 11036 11036 0 0.00% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/ 426000 426000 0 0.00% 17532 17532 0 0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/ 172168 172168 0 0.00% 9216 9216 0 0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/ 163516 163516 0 0.00% 10020 10020 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/ 122252 122252 0 0.00% 14348 14348 0 0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/ 374444 374444 0 0.00% 19996 19996 0 0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/ 373068 373068 0 0.00% 19056 19056 0 0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/ 180256 180256 0 0.00% 12496 12496 0 0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2040 -stack-size 8kb ./examples/net/tlsclient/ 126540 126540 0 0.00% 12332 12332 0 0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2350 -stack-size 8kb ./examples/net/ntpclient/ 7020684 7020684 0 0.00% 1115126 1115126 0 0.00% |
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Thanks for testing @0hJonny now merging. |
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This fixes the tinyhci failure on the XIAO ESP32-C3 after #5774 (https://github.com/tinygo-org/tinygo/runs/109145110032).
Bisecting showed the failure starts at ea7f352, which removed the 9 SCL clocks from
resetMaster(). From then on the MPU-6050 NACKs the firstConfigure()after a chip reset.This PR adds a bus clear in
Configure()before the pins go to the I2C controller. It is the same as the softwarei2c_master_clear_busin ESP-IDF v4.4.8 (https://github.com/espressif/esp-idf/blob/v4.4.8/components/driver/i2c.c#L579). SCL is clocked while SDA is held low, then a STOP is sent with the pins as open drain GPIOs.At boot SDA is already high, so no clocks are sent and only the STOP goes out. A version with only the STOP also passed. This matches what @0hJonny found on the GT911 in #5774, where 9 clocks plus a GPIO STOP worked.
Test
Tested on a XIAO ESP32-C3 with the Seeed expansion board and an MPU-6050.
i2cConnection()passes 3 times per boot in 3 boots. Before this PR the first one failed every boot.xiao-esp32c3,xiao-esp32c6andesp32s3-generic.Not tested on ESP32-C6 or ESP32-S3 hardware, or with a GT911.