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raspberrypipico:pico_pio [2021/03/13 19:34]
admin [wait(option)] 		raspberrypipico:pico_pio [2021/06/07 18:05]
admin [Knowledge]
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 **frequency** the frequency of the state machine, should be between 1000 and 125000000\\ **frequency** the frequency of the state machine, should be between 1000 and 125000000\\
  
-**GPIO pin** depending on the first on all following pins will be mapped (up to 32)\\+**GPIO pin** depending on the first one, all following pins will be mapped (up to 32)\\
 INPUT: in_base (sets input pins) INPUT: in_base (sets input pins)
    sm = StateMachine(0, do_something, freq=1000, in_base=pin10)    sm = StateMachine(0, do_something, freq=1000, in_base=pin10)
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 - polarity (1 clears the interrupt flag, 0 won't)\\ - polarity (1 clears the interrupt flag, 0 won't)\\
 - num (interrupt number, with rel the relative interrupt numbers could be used)\\   - num (interrupt number, with rel the relative interrupt numbers could be used)\\  
 +
    wait(1, irq, rel(0))    wait(1, irq, rel(0))
  
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    set(pins, 1) [31] #drive first mapped pin high and delay 31 cycles    set(pins, 1) [31] #drive first mapped pin high and delay 31 cycles
 ====nop()==== ====nop()====
-The NOP instruction stands for no operations. It can delays 0 to 31 cycles.\\ +The NOP instruction stands for no operations. In combination with the delay function one can create delays between 1 to 31 cycles.\\ 
-   nop (31)    #delay 31 cycles+   nop () [31]   #delay 31 cycles
  
 ====wrap()==== ====wrap()====
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 ---- ----
-===== Simple Audio Out===== 
  
-   GPIO03----4k--- 
-                  | 
-   GPIO04----2k---- 
-                  |------ Audio Out 
-   GPIO05----1k---- 
-                  | 
-   GPIO06----500--- 
  
----- 
-==== Resistor DAC ==== 
- 
- 
----- 
 ===== Knowledge ===== ===== Knowledge =====
 [[https://www.youtube.com/watch?v=yYnQYF_Xa8g|In-depth: Raspberry Pi Pico's PIO - programmable I/O!]] by stacksmashing\\ [[https://www.youtube.com/watch?v=yYnQYF_Xa8g|In-depth: Raspberry Pi Pico's PIO - programmable I/O!]] by stacksmashing\\
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 [[https://www.seeedstudio.com/blog/2021/01/25/programmable-io-with-raspberry-pi-pico/|Seeedstudio: Programmable I/O with Raspberry Pi Pico by Jonathan Tan]]\\ [[https://www.seeedstudio.com/blog/2021/01/25/programmable-io-with-raspberry-pi-pico/|Seeedstudio: Programmable I/O with Raspberry Pi Pico by Jonathan Tan]]\\
 +
 +----
 +==== License ====
 +
 +This manuals is made by **Wolfgang Spahn** 2021.\\
 +Except where otherwise noted, content on this wiki is licensed under the following license: [[http://creativecommons.org/licenses/by-nc-sa/4.0/"|Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License]].\\
 +
 +<html>
 +<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a> 
 +</html>
  
 ---- ----