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Optimize initialization of PMW3360 Sensor #15821

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Jan 10, 2022
Merged

Optimize initialization of PMW3360 Sensor #15821

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fd8a3ed
Optimize initialization of PMW3360 Sensor
drashna Jan 10, 2022
6df9cb7
Update pmw3360 docs
drashna Jan 10, 2022
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15 changes: 8 additions & 7 deletions docs/feature_pointing_device.md
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Expand Up @@ -144,13 +144,14 @@ The PMW 3360 is an SPI driven optical sensor, that uses a built in IR LED for su

| Setting | Description | Default |
|-----------------------------|--------------------------------------------------------------------------------------------|---------------|
|`PMW3360_CS_PIN` | (Required) Sets the Cable Select pin connected to the sensor. | _not defined_ |
|`PMW3360_CLOCK_SPEED` | (Optional) Sets the clock speed that the sensor runs at. | `2000000` |
|`PMW3360_SPI_LSBFIRST` | (Optional) Sets the Least/Most Significant Byte First setting for SPI. | `false` |
|`PMW3360_SPI_MODE` | (Optional) Sets the SPI Mode for the sensor. | `3` |
|`PMW3360_SPI_DIVISOR` | (Optional) Sets the SPI Divisor used for SPI communication. | _varies_ |
|`PMW3360_LIFTOFF_DISTANCE` | (Optional) Sets the lift off distance at run time | `0x02` |
|`ROTATIONAL_TRANSFORM_ANGLE` | (Optional) Allows for the sensor data to be rotated +/- 30 degrees directly in the sensor. | `0` |
|`PMW3360_CS_PIN` | (Required) Sets the Cable Select pin connected to the sensor. | _not defined_ |
|`PMW3360_CLOCK_SPEED` | (Optional) Sets the clock speed that the sensor runs at. | `2000000` |
|`PMW3360_SPI_LSBFIRST` | (Optional) Sets the Least/Most Significant Byte First setting for SPI. | `false` |
|`PMW3360_SPI_MODE` | (Optional) Sets the SPI Mode for the sensor. | `3` |
|`PMW3360_SPI_DIVISOR` | (Optional) Sets the SPI Divisor used for SPI communication. | _varies_ |
|`PMW3360_LIFTOFF_DISTANCE` | (Optional) Sets the lift off distance at run time | `0x02` |
|`ROTATIONAL_TRANSFORM_ANGLE` | (Optional) Allows for the sensor data to be rotated +/- 127 degrees directly in the sensor. | `0` |
|`PMW3360_LEGACY_FIRMWARE_UPLOAD` | (Optional) Switches to older, manual upload of firmware, for compatibility. | _not defined_ |

The CPI range is 100-12000, in increments of 100. Defaults to 1600 CPI.

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4 changes: 4 additions & 0 deletions drivers/sensors/pmw3360.c
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Expand Up @@ -209,12 +209,16 @@ void pmw3360_upload_firmware(void) {
spi_write(REG_SROM_Load_Burst | 0x80);
wait_us(15);

#ifdef PMW3360_LEGACY_FIRMWARE_UPLOAD
unsigned char c;
for (int i = 0; i < FIRMWARE_LENGTH; i++) {
c = (unsigned char)pgm_read_byte(firmware_data + i);
spi_write(c);
wait_us(15);
}
#else
spi_transmit(firmware_data, sizeof(firmware_data));
#endif
wait_us(200);

pmw3360_read(REG_SROM_ID);
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