jondurrant / rp2040pio-ds18b20

Raspberry Pi PICO or RP2040 PIO Lib for DS18B20 Temperature Sensor

RP2040PIO-DS18B20

Raspberry Pi PICO or RP2040 PIO Lib for DS18B20 Temperature Sensor

Based on code from Harry Fairhead (2021): "The Pico In C: A 1-Wire PIO Program".

Dependencies

Pico SDK dependencies only (GPIO and PIO)

Example

See main.cxx

Include in own projects

Simply include DS18B20pio.cmake in your CMakefile Then add ds18b20pio into target_link_libaries

Usage

Construct object:

DS18B20 ds = DS18B20(pio0, 7);

Giving the pio being used, I've only used pio0. And the GPIO number, in this case 7.

Trigger the device to sample with the command:

ds.convert();

Then give the divise approx 1000ms to complete that before reading the temperature with:

float temp = ds.getTermperature();

rp2040pio-ds18b20's Issues

Problems building example

Hello, I'm having a couple of problems trying to build your example code for the RPi pico. I'm using Debian 11 and VS Code and am new to using CMake. So, I've made a folder under ~/pico/projects/ds1820 and copied your code (unmodified) to it. VS Code seems to do the configuration OK, but fails on the build with:-

[build] .../pico/projects/ds1820/src/main.cxx:4:10: fatal error: DS1820.pio.h: No such file or directory
[build] #include "DS1820.pio.h"

If I run build just on 'ds18p20pio_DS1820_pio_h' I can see that this missing header file has been generated in the 'build' subdir, but is obviously not being found by the main build. If I copy that header file (DS1820.pio.h) to the 'src' directory, then I get much further. It looks like all the compilation gets done, but then fails on linking:-

[build] [ 94%] Linking CXX executable DS18B20.elf
[build] /usr/lib/gcc/arm-none-eabi/8.3.1/../../../arm-none-eabi/bin/ld: cannot find -lds20b18pio
[build] collect2: error: ld returned 1 exit status

So 'ds20b18pio' doesn't seem to get created (I can't find this in any other location) but I'm struggling to find out why this is. Any pointers on how to track down the problem would be much appreciated.
Rgds,
DB