go-packages/go-rpio
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This commit is contained in:
Drahoslav 2017-11-14 22:33:04 +01:00
parent b604d03178
commit cdcd97f287
1 changed files with 29 additions and 29 deletions
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16
rpio.go
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@ -86,7 +86,7 @@ var (
clkBase int64 clkBase int64
) )
func init () { func init() {
base = getBase() base = getBase()
gpioBase = base + gpioOffset gpioBase = base + gpioOffset
clkBase = base + clkOffset clkBase = base + clkOffset
@ -247,7 +247,7 @@ func ReadPin(pin Pin) State {
// Input level register offset (13 / 14 depending on bank) // Input level register offset (13 / 14 depending on bank)
levelReg := uint8(pin)/32 + 13 levelReg := uint8(pin)/32 + 13
if (gpioMem[levelReg] & (1 << uint8(pin & 31))) != 0 { if (gpioMem[levelReg] & (1 << uint8(pin&31))) != 0 {
return High return High
} }
@ -294,7 +294,6 @@ func PullMode(pin Pin, pull Pull) {
} }
// Set clock speed for given pin // Set clock speed for given pin
// //
// freq should be in range 4688Hz - 19.2MHz to prevent unexpected behavior // freq should be in range 4688Hz - 19.2MHz to prevent unexpected behavior
@ -338,7 +337,8 @@ func SetClock(pin Pin, freq int) {
const src = 0x01 // oscilator const src = 0x01 // oscilator
clkMem[clkCtlReg] = PASSWORD | src // stop gpio clock clkMem[clkCtlReg] = PASSWORD | src // stop gpio clock
for clkMem[clkCtlReg] & busy != 0 {} // ... and wait for clkMem[clkCtlReg]&busy != 0 {
} // ... and wait
clkMem[clkDivReg] = PASSWORD | (divi << 12) | divf // set dividers clkMem[clkDivReg] = PASSWORD | (divi << 12) | divf // set dividers
clkMem[clkCtlReg] = PASSWORD | enab | src // start clock clkMem[clkCtlReg] = PASSWORD | enab | src // start clock
@ -379,10 +379,10 @@ func Open() (err error) {
return nil return nil
} }
func memMap (fd uintptr, offset int64) (mem []uint32, mem8 []byte, err error) { func memMap(fd uintptr, offset int64) (mem []uint32, mem8 []byte, err error) {
mem8, err = syscall.Mmap( mem8, err = syscall.Mmap(
int(fd), int(fd),
base + clkOffset, base+clkOffset,
memLength, memLength,
syscall.PROT_READ|syscall.PROT_WRITE, syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED, syscall.MAP_SHARED,
@ -402,10 +402,10 @@ func memMap (fd uintptr, offset int64) (mem []uint32, mem8 []byte, err error) {
func Close() error { func Close() error {
memlock.Lock() memlock.Lock()
defer memlock.Unlock() defer memlock.Unlock()
if err := syscall.Munmap(gpioMem8) { if err := syscall.Munmap(gpioMem8); err != nil {
return err return err
} }
if err := syscall.Munmap(clkMem8) { if err := syscall.Munmap(clkMem8); err != nil {
return err return err
} }
return nil return nil