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soypat
69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package apds9930
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import "tinygo.org/x/drivers"
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type Dev struct {
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bus drivers.I2C
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_txerr error
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addr uint16
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buf [8]byte
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}
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func New(bus drivers.I2C, addr uint8) Dev {
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return Dev{bus: bus, addr: uint16(addr)}
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}
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func (d *Dev) Init() error {
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d.txNew()
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d.txWrite8(regENABLE, 0x00) // disable all features.
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d.txWrite8(regATIME, 0xee) // set default integration time.
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d.txWrite8(regPPULSE, 0x04)
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d.txWrite8(regWTIME, 0xee) // set default wait time.
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d.txWrite8(regPTIME, 0xff) // set default pulse count.
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d.txWrite8(regCONTROL, 0x20)
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return d.txErr()
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}
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func (d *Dev) EnableProximity() error {
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d.txNew()
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d.txWrite8(regENABLE, 8|4|2|1)
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return d.txErr()
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}
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func (d *Dev) ProximityAvailable() bool {
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d.txNew()
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return d.txRead8(regSTATUS)&0x20 == 1
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}
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func (d *Dev) ReadProximity() uint8 {
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d.txNew()
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h := d.txRead8(regPDATAH)
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l := d.txRead8(regPDATAL)
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if d.txErr() != nil {
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return 0
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}
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return (h << 8) | l
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}
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func (d *Dev) txRead8(reg uint8) uint8 {
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if d.txErr() != nil {
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return 0
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}
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d.buf[0] = reg | 0xa0
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d._txerr = d.bus.Tx(d.addr, d.buf[:1], d.buf[1:2])
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return d.buf[1]
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}
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func (d *Dev) txWrite8(reg uint8, val uint8) {
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if d.txErr() != nil {
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return
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}
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d.buf[0] = reg | 0x80
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d.buf[1] = val
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d._txerr = d.bus.Tx(d.addr, d.buf[:2], nil)
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}
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func (d *Dev) txNew() { d._txerr = nil }
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func (d *Dev) txErr() error { return d._txerr }
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