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raspberrypipico:pico_pio [2021/03/13 19:28]
admin 		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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    wait(0, pin, 0)    wait(0, pin, 0)
  
-====wait()====+====wait(option)====
 **wait(//polarity//, gpio, //num//)**\\ **wait(//polarity//, gpio, //num//)**\\
 It will waits until the specified GPIO has the specified polarity.\\ It will waits until the specified GPIO has the specified polarity.\\
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 It does the same like before, but it uses the pin mapping.\\ It does the same like before, but it uses the pin mapping.\\
    wait(1, pin, 0)    wait(1, pin, 0)
-**wait (//polarity//, irq, //num(rel)//)\\**+**wait (//polarity//, irq, //num(rel)//)**\\
 It will wait for an irg to be set.\\ It will wait for an irg to be set.\\
 - polarity (1 clears the interrupt flag, 0 won't)\\ - polarity (1 clears the interrupt flag, 0 won't)\\
-- num (number of interrupt, 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))
  
-====in(source, bitcount)====+====in(source, bits)====
 The IN instructor shifts data from the source into the input shift register (ISR).\\ The IN instructor shifts data from the source into the input shift register (ISR).\\
 **source:**\\ **source:**\\
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 - status (from special register could e.g. indicate FIFO empty or full)\\ - status (from special register could e.g. indicate FIFO empty or full)\\
 - osr (from output shift registers)\\ - osr (from output shift registers)\\
-**bitcount:**\\+**bits:**\\
 - 0-31 bits\\ - 0-31 bits\\
  
-====out(destination, bitcount)====+====out(destination, bits)====
 The OUT instructor shifts data from the output shift register (OSR) to the destination.\\ The OUT instructor shifts data from the output shift register (OSR) to the destination.\\
 **destination:**\\ **destination:**\\
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 - pc (shifts an instruction into the program counter)\\   - pc (shifts an instruction into the program counter)\\  
 - isr (into the input shift registers)\\ - isr (into the input shift registers)\\
-**bitcount:**\\+**bits:**\\
 - 0-31 bits\\ - 0-31 bits\\
  
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   mov(osr, x) #copy the x scratch register to the output shift register    mov(osr, x) #copy the x scratch register to the output shift register 
  
-====irq(option, irq_num, rel)====+====irq(option, num(rel))====
 The IRQ instruction sets or clears an interrupt flag.\\ The IRQ instruction sets or clears an interrupt flag.\\
 **option**\\ **option**\\
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 - wait (wait until the flag is zero before setting it)\\ - wait (wait until the flag is zero before setting it)\\
 - clear (clears the flag)\\ - clear (clears the flag)\\
-**irq_num**, number of the interrupt 0-7\\ +**num** number of the interrupt 0-7\\ 
-**rel** relative IRQ number, can set different IRQ per StateMachine, ([1:0]+sm_number)%4 \\+**rel** relative IRQ number\\
 In the StateMachine In the StateMachine
    irq(block, rel(0))    irq(block, 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>
  
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