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machine/rp2040: set XOSC startup delay multiplier

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XOSC requires additional time to stablize on certain RP2040 boards.

Signed-off-by: Xudong Zheng <7pkvm5aw@slicealias.com>
This commit is contained in:
Xudong Zheng
2024-02-01 12:54:58 -05:00
committed by Ron Evans
parent 0952b1b984
commit f5e933cd4d
1 changed files with 6 additions and 1 deletions
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src/machine/machine_rp2040_xosc.go
+6 -1
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@@ -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