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The Pi's hardware i2c has buggy silicon and does not handle clock stretching properly. There's also a kernel driver to bitbang i2c over the GPIO pins and clock
by opencl 7y ago
The Pi's hardware i2c has buggy silicon and does not handle clock stretching properly. There's also a kernel driver to bitbang i2c over the GPIO pins and clock stretching does work properly with that.
- BubRoss 7y agoDoes the PI 4 also have this problem?
- opencl 7y agoI'm not sure about the 4, though it was present at least from the original up through the 3B+.
- davidf560 7y agoThere's a claim that it was fixed here: https://www.raspberrypi.org/forums/viewtopic.php?p=1484482#p1484482 https://www.raspberrypi.org/forums/viewtopic.php?p=1484482#p... Apparent confirmation here (by mapping a different I2C bus?): https://www.raspberrypi.org/forums/viewtopic.php?p=1544123&sid=9893879e086f80a2c71987dc6a564089#p1544123 https://www.raspberrypi.org/forums/viewtopic.php?p=1544123&s...