working more or less

This commit is contained in:
soypat
2023-12-26 22:35:48 -03:00
parent 4bd873a82d
commit 09b7b249fe
3 changed files with 193 additions and 15 deletions
+183 -13
View File
@@ -1,59 +1,229 @@
package apds9930
import "tinygo.org/x/drivers"
import (
"errors"
"tinygo.org/x/drivers"
)
var errInvalidParam = errors.New("apds9930: invalid param")
type Dev struct {
bus drivers.I2C
_txerr error
addr uint16
buf [8]byte
buf [3]byte
}
func New(bus drivers.I2C, addr uint8) Dev {
return Dev{bus: bus, addr: uint16(addr)}
}
func (d *Dev) Init() error {
// Status contains info on:
//
// AVALID: Indicates that the ALS Ch0/Ch1 channels have completed an integration cycle.
// PSValid. Indicates that the PS has completed an integration cycle.
// AINTL ALS Interrupt. Indicates that the device is asserting an ALS interrupt
// PINT: Proximity Interrupt. Indicates that the device is asserting a proximity interrupt.
// PSAT: Proximity Saturation. Indicates that the proximity measurement is saturated
type Status uint8
func (s Status) ALSAvailable() bool { return s&(1<<0) != 0 } // AVALID
func (s Status) ProximityAvailable() bool { return s&(1<<1) != 0 } // PVALID
func (s Status) HasALSInterrupt() bool { return s&(1<<4) != 0 } // AINT
func (s Status) HasProxInterrupt() bool { return s&(1<<5) != 0 } // PINT
func (s Status) IsProximitySaturated() bool { return s&(1<<6) != 0 } // PSAT
type Enable uint8
const (
EnPower Enable = 1 << iota
EnALS
EnProx
EnWait
EnALSInt
EnProxInt
EnSleepAfterInt
)
// Luminic control gain.
type ALSGain uint8
const (
AGain1 ALSGain = iota
AGain8
AGain16
AGain120
)
type ProxGain uint8
const (
PGain1 ProxGain = iota
PGain2
PGain4
PGain8
)
type Drive uint8
const (
_ Drive = iota
Drive12_5mA
Drive25mA
Drive50mA
Drive100mA
)
type Config struct {
StartMode Enable
LEDDrive Drive
// ALSGain ALSGain
// ProximityGain ProxGain
}
func (d *Dev) Init(cfg Config) error {
if cfg.LEDDrive > Drive100mA {
return errInvalidParam
}
d.txNew()
d.txWrite8(regENABLE, 0x00) // disable all features.
d.txWrite8(regATIME, 0xee) // set default integration time.
d.txWrite8(regPPULSE, 0x04)
d.txWrite8(regWTIME, 0xee) // set default wait time.
d.txWrite8(regPTIME, 0xff) // set default pulse count.
d.txWrite8(regCONTROL, 0x20)
if d.txErr() != nil {
return d.txErr()
}
if cfg.LEDDrive != 0 {
err := d.SetLEDDrive(cfg.LEDDrive)
if err != nil {
return err
}
}
return nil
}
func (d *Dev) Status() (Status, error) {
d.txNew()
v := d.txRead8(regSTATUS)
return Status(v), d.txErr()
}
// Enable sets the ENABLE register used primarily to
// power the APDS-9930 device on/off, enable functions, and interrupts.
// Arguments must be ORed, i.e: d.Enable(EnPower|EnProx); to enable proximity.
func (d *Dev) Enable(en Enable) error {
en &= 0b01111111 // Seventh bit reserved.
d.txNew()
d.txWrite8(regENABLE, uint8(en))
return d.txErr()
}
func (d *Dev) enableLightSensor(withInterrupts bool) error {
return nil
}
func (d *Dev) setAmbientLightGain() {
}
func (d *Dev) EnableProximity() error {
return d.Enable(EnPower | EnALS | EnProx | EnWait)
}
func (d *Dev) proxIntLowThresh() (uint16, error) {
d.txNew()
d.txWrite8(regENABLE, 8|4|2|1)
return d.txRead16(regPILTL), d.txErr()
}
func (d *Dev) setProxIntLowThresh(loThresh uint16) error {
d.txNew()
d.txWrite16(regPILTL, loThresh)
return d.txErr()
}
func (d *Dev) ProximityAvailable() bool {
func (d *Dev) proxIntHighThresh() (uint16, error) {
d.txNew()
return d.txRead8(regSTATUS)&0x20 == 1
val := d.txRead16(regPIHTL)
return val, d.txErr()
}
func (d *Dev) ReadProximity() uint8 {
func (d *Dev) setProxIntHighThresh(hiThresh uint16) error {
d.txNew()
h := d.txRead8(regPDATAH)
l := d.txRead8(regPDATAL)
d.txWrite16(regPIHTL, hiThresh)
return d.txErr()
}
func (d *Dev) LEDDrive() (Drive, error) {
d.txNew()
val := (d.txRead8(regCONTROL) >> 6) & 0b11
return 3 - Drive(val), d.txErr()
}
// SetLEDDrive drive strength for proximity and ALS
//
// Value LED Current
// 3 100 mA
// 2 50 mA
// 1 25 mA
// 0 12.5 mA
func (d *Dev) SetLEDDrive(drive Drive) error {
if drive > 3 {
return errInvalidParam
}
drive = 3 - drive
current, err := d.LEDDrive()
if err != nil {
return err
}
// Replace LED bits in Control register.
current &= 0b00111111
current |= drive << 6
d.txNew()
d.txWrite8(regCONTROL, uint8(current))
return d.txErr()
}
func (d *Dev) proxGain() (uint8, error) {
val := d.txRead8(regCONTROL)
return (val >> 2) & 0b11, d.txErr()
}
// ReadProximity returns a 10-bit value (0..1023), the higher the value the closer the object
func (d *Dev) ReadProximity() uint16 {
d.txNew()
v := d.txRead16(regPDATAL)
if d.txErr() != nil {
return 0
}
return (h << 8) | l
return v
}
func (d *Dev) txRead8(reg uint8) uint8 {
func (d *Dev) txRead16(addr uint8) uint16 {
if d.txErr() != nil {
return 0
}
d.buf[0] = reg | 0xa0
d.buf[0] = addr | protoAutoInc
d._txerr = d.bus.Tx(d.addr, d.buf[:1], d.buf[1:3])
return uint16(d.buf[1]) | uint16(d.buf[2])<<8
}
func (d *Dev) txRead8(addr uint8) uint8 {
if d.txErr() != nil {
return 0
}
d.buf[0] = addr | protoAutoInc
d._txerr = d.bus.Tx(d.addr, d.buf[:1], d.buf[1:2])
return d.buf[1]
}
func (d *Dev) txWrite16(addr uint8, val uint16) {
d.txWrite8(addr, uint8(val))
d.txWrite8(addr+1, uint8(val>>8))
}
func (d *Dev) txWrite8(reg uint8, val uint8) {
if d.txErr() != nil {
return
+4
View File
@@ -1,5 +1,9 @@
package apds9930
const (
protoAutoInc = 0xA0
)
const (
regENABLE = 0x00
regATIME = 0x01
+6 -2
View File
@@ -22,7 +22,7 @@ func main() {
}
sensor := apds9930.New(bus, 0x39)
err = sensor.Init()
err = sensor.Init(apds9930.Config{})
if err != nil {
panic(err)
}
@@ -32,7 +32,11 @@ func main() {
}
println("proximity enabled!")
for {
time.Sleep(50 * time.Millisecond)
stat, _ := sensor.Status()
if !stat.ProximityAvailable() {
time.Sleep(5 * time.Millisecond)
continue
}
prox := sensor.ReadProximity()
println("proximity:", prox)
}