diff options
author | David Grayson <davidegrayson@gmail.com> | 2023-03-03 11:38:48 -0800 |
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committer | Damien George <damien@micropython.org> | 2023-03-09 11:44:20 +1100 |
commit | f80d040c038c343b0709eba537014fb52bc8115e (patch) | |
tree | 145702c4816520d17faeadb8a9fc117c082394fe /docs/library | |
parent | 673957b643b111e5879efd05a2ddf0808ed613d0 (diff) |
rp2/modrp2: Disable other core, shorten delay to 8us in bootsel_button.
This function seems to work fine in multi-core applications now.
The delay is now in units of microseconds instead of depending on the clock
speed, and is adjustable by board configuration headers.
Also added documentation.
Diffstat (limited to 'docs/library')
-rw-r--r-- | docs/library/rp2.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/library/rp2.rst b/docs/library/rp2.rst index ec7666d7c..7a473387b 100644 --- a/docs/library/rp2.rst +++ b/docs/library/rp2.rst @@ -66,6 +66,17 @@ For running PIO programs, see :class:`rp2.StateMachine`. >>> rp2.asm_pio_encode("set(0, 1)", 0) 57345 +.. function:: bootsel_button() + + Temporarily turns the QSPI_SS pin into an input and reads its value, + returning 1 for low and 0 for high. + On a typical RP2040 board with a BOOTSEL button, a return value of 1 + indicates that the button is pressed. + + Since this function temporarily disables access to the external flash + memory, it also temporarily disables interrupts and the other core to + prevent them from trying to execute code from flash. + .. class:: PIOASMError This exception is raised from `asm_pio()` or `asm_pio_encode()` if there is |