go-packages/go-rpio
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Mmap pwm memmory

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This commit is contained in:
Drahoslav 2017-11-17 09:37:18 +01:00
parent 4a31f2cfa6
commit cc678981b0
1 changed files with 11 additions and 1 deletions
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12
rpio.go
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@ -76,6 +76,7 @@ const (
bcm2835Base = 0x20000000 bcm2835Base = 0x20000000
gpioOffset = 0x200000 gpioOffset = 0x200000
clkOffset = 0x101000 clkOffset = 0x101000
pwmOffset = 0x20C000
memLength = 4096 memLength = 4096
) )
@ -83,12 +84,14 @@ const (
var ( var (
gpioBase int64 gpioBase int64
clkBase int64 clkBase int64
pwmBase int64
) )
func init() { func init() {
base := getBase() base := getBase()
gpioBase = base + gpioOffset gpioBase = base + gpioOffset
clkBase = base + clkOffset clkBase = base + clkOffset
pwmBase = base + pwmOffset
} }
// Pin mode, a pin can be set in Input or Output, Clock or Pwm mode // Pin mode, a pin can be set in Input or Output, Clock or Pwm mode
@ -117,8 +120,10 @@ var (
memlock sync.Mutex memlock sync.Mutex
gpioMem []uint32 gpioMem []uint32
clkMem []uint32 clkMem []uint32
pwmMem []uint32
gpioMem8 []uint8 gpioMem8 []uint8
clkMem8 []uint8 clkMem8 []uint8
pwmMem8 []uint8
) )
// Set pin as Input // Set pin as Input
@ -388,7 +393,7 @@ func Open() (err error) {
// Open fd for rw mem access; try dev/mem first (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) 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) if os.IsPermission(err) { // try gpiomem otherwise (some extra functions like clock and pwm setting wont work)
file, err = os.OpenFile("/dev/gpiomem", os.O_RDWR|os.O_SYNC, 0) file, err = os.OpenFile("/dev/gpiomem", os.O_RDWR|os.O_SYNC, 0)
} }
if err != nil { if err != nil {
@ -412,6 +417,11 @@ func Open() (err error) {
return return
} }
pwmMem, pwmMem8, err = memMap(file.Fd(), clkBase)
if err != nil {
return
}
return nil return nil
} }