tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-13 07:23:39 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

teensy40: fix PIT clock, which actually uses 24 MHz OSC

Browse Source 
see: https://forum.pjrc.com/threads/63979-What-peripherals-are-affected-by-the-undocumented-24-MHz-OSC-circuit-on-Teensy-4-0
This commit is contained in:
ardnew
2020-10-22 20:58:42 -05:00
committed by Ron Evans
parent f93b28057a
commit 0d9c46b59e
2 changed files with 8 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/runtime/runtime_mimxrt1062_time.go
+6 -7
View File
@@ -11,15 +11,14 @@ import (
type timeUnit int64
const (
SYST_FREQ = OSC_FREQ // HW divides 24 MHz XTALOSC down to 100 kHz
lastCycle = SYST_FREQ/1000 - 1
microsPerCycle = 1000000 / SYST_FREQ
const ( // HW divides 24 MHz XTALOSC down to 100 kHz
lastCycle = SYSTICK_FREQ/1000 - 1
microsPerCycle = 1000000 / SYSTICK_FREQ
)
const (
PIT_FREQ = OSC_FREQ // HW divides 24 MHz XTALOSC down to 100 kHz
pitMicrosPerCycle = 1000000 / PIT_FREQ
PIT_FREQ = PERCLK_FREQ
pitCyclesPerMicro = PIT_FREQ / 1000000
pitSleepTimer = 0 // x4 32-bit PIT timers [0..3]
)
@@ -88,7 +87,7 @@ func sleepTicks(duration timeUnit) {
curr := ticks()
last := curr + duration
for curr < last {
cycles := timeUnit((last - curr) * pitMicrosPerCycle)
cycles := timeUnit((last - curr) / pitCyclesPerMicro)
if cycles > 0xFFFFFFFF {
cycles = 0xFFFFFFFF
}