Go drivers for pheripheral I/O on Linux.
License: Mozilla Public License 2.0
Go packages for pheripheral I/O. It contains driver for the following IC's:
IO is licensed under Mozilla Public License © 2017 Advanced Climate System.
The MCP3004 and MCP3204 both have 4 channels. OutputCode(channel int) validates the channel number. It should only allow channels 0, 1, 2 and 3. But it also allows channel 4. This is wrong.
The edge triggers work fine for about ~9000 triggers, after that no more events get triggered.
This is caused by the file descriptor for the GPIO's value file becoming invalid, thus it can't be used to detect events anymore.
I suspect the file descriptor is invalid because the actual file object gets garbage collected. This means the easiest way to fix this issue is to keep a reference to the actual file in the watcher somewhere.
The CI still uses old version of go to run the tests (1.8, 1.9). The 1.8 tests fail because some dependency is not backwards compatible to that version.
These should be updated to the latest version of go (1.11)
GPIO 20 till 15 are also supported but are not yet present in the mapping.
The read12 function used by the MCP320x driver does not create the expected command.
if inputType == adc.SingleEnded {
cmd = 1
}
The part of code responsible is shown above. Instead of adding a 1 to the cmd, it replaces the entire command. This causes some unexpected behavior when reading the voltage from the chip.
To fix this the 1 should be added after the first part of the command instead of replacing it entirely.
The output code is calculated like this : code := v * 4096 / m.vref. This is incorrect bacuase 10V gives a code of 4096 which is 13 bits long instead of the expected max of 4095.
The most simple fix is to change the calculation to this: code := v * 4095 / m.vref.
For example, setting 5 volt on a device with a resolution of 10 and a vref of 10 writes the following bytes: 0xff 0xc0. This is the same as setting 10 volt on a device with a resolution of 10 and a vref of 10.
This has not been caught in the test because for higher resolutions they on check the highest and lowest value, which appears to be correct.
This issue is most likely caused by the way the code is turned into the 2 data bytes.
I just wanted to report that I tested your code on a Raspberry Pi, and it works beautifully.
Thank you very much, and keep up the good work!
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