tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-19 03:54:01 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

machine/stm32f103xx: prevent time.Sleep() issues by preventing sleeping for less than 200us, which is the current effictive minimum due to prescaler settings.

Browse Source 
Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-09-24 11:17:16 +02:00
committed by Ayke
parent 076699add8
commit 368abeeb9a
1 changed files with 8 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/runtime/runtime_stm32f103xx.go
+8 -2
View File
@@ -160,12 +160,18 @@ func timerSleep(ticks uint32) {
// TODO: support smaller or larger scales (autoscaling) based // TODO: support smaller or larger scales (autoscaling) based
// on the length of sleep time requested. // on the length of sleep time requested.
// The current scaling only supports a range of 100 usec to 6553 msec. // The current scaling only supports a range of 200 usec to 6553 msec.
// prescale counter down from 72mhz to 10khz aka 0.1 ms frequency. // prescale counter down from 72mhz to 10khz aka 0.1 ms frequency.
stm32.TIM3.PSC.Set(machine.CPU_FREQUENCY/10000 - 1) // 7199 stm32.TIM3.PSC.Set(machine.CPU_FREQUENCY/10000 - 1) // 7199
// set duty aka duration // Set duty aka duration.
// STM32 dividers use n-1, i.e. n counts from 0 to n-1.
// As a result, with these prescaler settings,
// the minimum allowed duration is 200 microseconds.
if ticks < 200 {
ticks = 200
}
stm32.TIM3.ARR.Set(ticks/100 - 1) // convert from microseconds to 0.1 ms stm32.TIM3.ARR.Set(ticks/100 - 1) // convert from microseconds to 0.1 ms
// Enable the hardware interrupt. // Enable the hardware interrupt.