Module pio0

Programmable IO block

Re-exports

• pub use self::sm::SM;
• pub use self::sm_irq::SM_IRQ;

Modules

• ctrl
  PIO control register
• dbg_cfginfo
  The PIO hardware has some free parameters that may vary between chip products.
  These should be provided in the chip datasheet, but are also exposed here.
• dbg_padoe
  Read to sample the pad output enables (direction) PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.
• dbg_padout
  Read to sample the pad output values PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.
• fdebug
  FIFO debug register
• flevel
  FIFO levels
• fstat
  FIFO status register
• input_sync_bypass
  There is a 2-flipflop synchronizer on each GPIO input, which protects PIO logic from metastabilities. This increases input delay, and for fast synchronous IO (e.g. SPI) these synchronizers may need to be bypassed. Each bit in this register corresponds to one GPIO.
  0 -> input is synchronized (default)
  1 -> synchronizer is bypassed
  If in doubt, leave this register as all zeroes.
• instr_mem
  Write-only access to instruction memory location %s
• intr
  Raw Interrupts
• irq
  State machine IRQ flags register. Write 1 to clear. There are 8 state machine IRQ flags, which can be set, cleared, and waited on by the state machines. There’s no fixed association between flags and state machines – any state machine can use any flag.
• irq_force
  Writing a 1 to each of these bits will forcibly assert the corresponding IRQ. Note this is different to the INTF register: writing here affects PIO internal state. INTF just asserts the processor-facing IRQ signal for testing ISRs, and is not visible to the state machines.
• rxf
  Direct read access to the RX FIFO for this state machine. Each read pops one word from the FIFO. Attempting to read from an empty FIFO has no effect on the FIFO state, and sets the sticky FDEBUG_RXUNDER error flag for this FIFO. The data returned to the system on a read from an empty FIFO is undefined.
• sm
  Cluster Cluster SM%s, containing SM*_CLKDIV, SM*_EXECCTRL, SM*_SHIFTCTRL, SM*_ADDR, SM*_INSTR, SM*_PINCTRL
• sm_irq
  Cluster Cluster SM_IRQ%s, containing IRQ*_INTE, IRQ*_INTF, IRQ*_INTS
• txf
  Direct write access to the TX FIFO for this state machine. Each write pushes one word to the FIFO. Attempting to write to a full FIFO has no effect on the FIFO state or contents, and sets the sticky FDEBUG_TXOVER error flag for this FIFO.

Structs

• RegisterBlock
  Register block

Type Aliases

• CTRL
  CTRL (rw) register accessor: PIO control register
• DBG_CFGINFO
  DBG_CFGINFO (r) register accessor: The PIO hardware has some free parameters that may vary between chip products.
  These should be provided in the chip datasheet, but are also exposed here.
• DBG_PADOE
  DBG_PADOE (r) register accessor: Read to sample the pad output enables (direction) PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.
• DBG_PADOUT
  DBG_PADOUT (r) register accessor: Read to sample the pad output values PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.
• FDEBUG
  FDEBUG (rw) register accessor: FIFO debug register
• FLEVEL
  FLEVEL (r) register accessor: FIFO levels
• FSTAT
  FSTAT (r) register accessor: FIFO status register
• INPUT_SYNC_BYPASS
  INPUT_SYNC_BYPASS (rw) register accessor: There is a 2-flipflop synchronizer on each GPIO input, which protects PIO logic from metastabilities. This increases input delay, and for fast synchronous IO (e.g. SPI) these synchronizers may need to be bypassed. Each bit in this register corresponds to one GPIO.
  0 -> input is synchronized (default)
  1 -> synchronizer is bypassed
  If in doubt, leave this register as all zeroes.
• INSTR_MEM
  INSTR_MEM (w) register accessor: Write-only access to instruction memory location %s
• INTR
  INTR (r) register accessor: Raw Interrupts
• IRQ
  IRQ (rw) register accessor: State machine IRQ flags register. Write 1 to clear. There are 8 state machine IRQ flags, which can be set, cleared, and waited on by the state machines. There’s no fixed association between flags and state machines – any state machine can use any flag.
• IRQ_FORCE
  IRQ_FORCE (w) register accessor: Writing a 1 to each of these bits will forcibly assert the corresponding IRQ. Note this is different to the INTF register: writing here affects PIO internal state. INTF just asserts the processor-facing IRQ signal for testing ISRs, and is not visible to the state machines.
• RXF
  RXF (r) register accessor: Direct read access to the RX FIFO for this state machine. Each read pops one word from the FIFO. Attempting to read from an empty FIFO has no effect on the FIFO state, and sets the sticky FDEBUG_RXUNDER error flag for this FIFO. The data returned to the system on a read from an empty FIFO is undefined.
• TXF
  TXF (w) register accessor: Direct write access to the TX FIFO for this state machine. Each write pushes one word to the FIFO. Attempting to write to a full FIFO has no effect on the FIFO state or contents, and sets the sticky FDEBUG_TXOVER error flag for this FIFO.