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bmp280: remove alloc on read sensor data

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This commit is contained in:
Hikmatulloh Hari Mukti
2025-05-15 15:25:02 +07:00
committed by Ron Evans
parent dbc9022f6a
commit c4168864fd
1 changed files with 7 additions and 8 deletions
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bmp280/bmp280.go
+7 -8
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@@ -23,6 +23,7 @@ type Filter uint
type Device struct { type Device struct {
bus drivers.I2C bus drivers.I2C
Address uint16 Address uint16
buf [6]byte
cali calibrationCoefficients cali calibrationCoefficients
Temperature Oversampling Temperature Oversampling
Pressure Oversampling Pressure Oversampling
@@ -134,8 +135,8 @@ func (d *Device) PrintCali() {
// ReadTemperature returns the temperature in celsius milli degrees (°C/1000). // ReadTemperature returns the temperature in celsius milli degrees (°C/1000).
func (d *Device) ReadTemperature() (temperature int32, err error) { func (d *Device) ReadTemperature() (temperature int32, err error) {
data, err := d.readData(REG_TEMP, 3) data := d.buf[:3]
if err != nil { if err = d.readData(REG_TEMP, data); err != nil {
return return
} }
@@ -158,8 +159,8 @@ func (d *Device) ReadTemperature() (temperature int32, err error) {
// ReadPressure returns the pressure in milli pascals (mPa). // ReadPressure returns the pressure in milli pascals (mPa).
func (d *Device) ReadPressure() (pressure int32, err error) { func (d *Device) ReadPressure() (pressure int32, err error) {
// First 3 bytes are Pressure, last 3 bytes are Temperature // First 3 bytes are Pressure, last 3 bytes are Temperature
data, err := d.readData(REG_PRES, 6) data := d.buf[:6]
if err != nil { if err = d.readData(REG_PRES, data); err != nil {
return return
} }
@@ -203,7 +204,7 @@ func (d *Device) ReadPressure() (pressure int32, err error) {
} }
// readData reads n number of bytes of the specified register // readData reads n number of bytes of the specified register
func (d *Device) readData(register int, n int) ([]byte, error) { func (d *Device) readData(register int, data []byte) error {
// If not in normal mode, set the mode to FORCED mode, to prevent incorrect measurements // If not in normal mode, set the mode to FORCED mode, to prevent incorrect measurements
// After the measurement in FORCED mode, the sensor will return to SLEEP mode // After the measurement in FORCED mode, the sensor will return to SLEEP mode
if d.Mode != MODE_NORMAL { if d.Mode != MODE_NORMAL {
@@ -218,9 +219,7 @@ func (d *Device) readData(register int, n int) ([]byte, error) {
} }
// Read the requested register // Read the requested register
data := make([]byte, n) return legacy.ReadRegister(d.bus, uint8(d.Address), uint8(register), data[:])
err := legacy.ReadRegister(d.bus, uint8(d.Address), uint8(register), data[:])
return data, err
} }
// convert3Bytes converts three bytes to int32 // convert3Bytes converts three bytes to int32