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Use /mem/dev primarily - it is needed for clock settings to work

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Drahoslav 2017-11-16 01:28:34 +01:00
parent 95bb91625f
commit ec703e92e8
1 changed files with 5 additions and 7 deletions
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10
rpio.go
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@ -358,9 +358,7 @@ func SetFreq(pin Pin, freq int) {
clkMem[clkCtlReg] = PASSWORD | mash | src | enab // finally start clock
for clkMem[clkCtlReg]&busy == 0 {
time.Sleep(time.Microsecond * 10)
} // ... and wait for busy, just to be sure
// NOTE without root permission this changes will simply do nothing successfully
}
// Open and memory map GPIO memory range from /dev/mem .
@ -368,10 +366,10 @@ func SetFreq(pin Pin, freq int) {
func Open() (err error) {
var file *os.File
// Open fd for rw mem access; try gpiomem first
file, err = os.OpenFile("/dev/gpiomem", os.O_RDWR|os.O_SYNC, 0)
if os.IsNotExist(err) { // try mem (need root)
// Open fd for rw mem access; try dev/mem first (need root)
file, err = os.OpenFile("/dev/mem", os.O_RDWR|os.O_SYNC, 0)
if os.IsPermission(err) { // try gpiomem otherwise (some extra functions like clock setting wont work)
file, err = os.OpenFile("/dev/gpiomem", os.O_RDWR|os.O_SYNC, 0)
}
if err != nil {
return