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| author | Xudong Zheng <[email protected]> | 2024-02-01 12:54:58 -0500 |
|---|---|---|
| committer | Ron Evans <[email protected]> | 2024-02-11 11:59:54 +0100 |
| commit | f5e933cd4d418b0dffdbc4e795a417026ced778a (patch) | |
| tree | 6a8b291ff6dc1b6c883b0012f2197a2f85d3bd45 | |
| parent | 0952b1b98440eca0a9b5c1a1b136f9bee28096d5 (diff) | |
| download | tinygo-f5e933cd4d418b0dffdbc4e795a417026ced778a.tar.gz tinygo-f5e933cd4d418b0dffdbc4e795a417026ced778a.zip | |
machine/rp2040: set XOSC startup delay multiplier
XOSC requires additional time to stablize on certain RP2040 boards.
Signed-off-by: Xudong Zheng <[email protected]>
| -rw-r--r-- | src/machine/machine_rp2040_xosc.go | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/machine/machine_rp2040_xosc.go b/src/machine/machine_rp2040_xosc.go index c3d6d713a..0acac1f1e 100644 --- a/src/machine/machine_rp2040_xosc.go +++ b/src/machine/machine_rp2040_xosc.go @@ -8,6 +8,11 @@ import ( "unsafe" ) +// On some boards, the XOSC can take longer than usual to stabilize. On such +// boards, this is needed to avoid a hard fault on boot/reset. Refer to +// PICO_XOSC_STARTUP_DELAY_MULTIPLIER in the Pico SDK for additional details. +const XOSC_STARTUP_DELAY_MULTIPLIER = 64 + type xoscType struct { ctrl volatile.Register32 status volatile.Register32 @@ -30,7 +35,7 @@ func (osc *xoscType) init() { osc.ctrl.Set(rp.XOSC_CTRL_FREQ_RANGE_1_15MHZ) // Set xosc startup delay - delay := (((xoscFreq * MHz) / 1000) + 128) / 256 + delay := (((xoscFreq * MHz) / 1000) + 128) / 256 * XOSC_STARTUP_DELAY_MULTIPLIER osc.startup.Set(uint32(delay)) // Set the enable bit now that we have set freq range and startup delay |