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soypat
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package pca9685
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// Software reset addresses for generic i2c implementation
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// and PCA specific SWRST. See section 7.6
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const (
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I2CSWRSTADR = 0x0
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PCA9685SWRSTBYTE = 0b0000_0110 // 0x06
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)
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// Registries with nomenclature as seen in manual
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const (
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SUBADR1 uint8 = 0x2
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SUBADR2 uint8 = 0x3
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SUBADR3 uint8 = 0x4
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MODE1 uint8 = 0x0
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MODE2 uint8 = 0x1
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ALLCALLADR uint8 = 0x05
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SWRESET uint8 = 0b0000_0011
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// Start of LED registries. corresponds to LED0_ON_L register.
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// Use LED function to get registries of a specific PWM channel register.
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LEDSTART = 0x06
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)
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// MODE1
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const (
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RESET byte = 0b1000_0000
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EXTCLK byte = 0b0100_0000
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AI byte = 0b0010_0000
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SLEEP byte = 0b0001_0000
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defaultMODE1Value byte = 0b0001_0001
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)
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// MODE2
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const (
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OUTDRV = 1 << 2
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INVRT = 1 << 4
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)
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// LED channels from 0-15. Returns 4 registries associated with
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// the channel PWM signal. Channel 250 (0xFA) gives ALL_LED registers.
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// The L suffix represents the 8 LSB of 12 bit timing, the H suffix represents
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// the 4 MSB of the timing. This way you have 0-4095 timing options. ON or OFF
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// will be a number between these two or will be simply ON or OFF (fifth bit of H registry).
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//
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// The SetPWM implementation in this library does not do phase-shifting so OFF will always
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// happen at time stamp 0. ON will solely decide duty cycle.
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func LED(ch uint8) (ONL, ONH, OFFL, OFFH uint8) {
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switch {
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case ch == ALLLED:
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return ALLLED, ALLLED + 1, ALLLED + 2, ALLLED + 3
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case ch > 15:
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panic("PWM channel out of range [0-15]")
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default:
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}
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// 4 registries per channel. Starts at 6
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onLReg := LEDSTART + 4*ch
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return onLReg, onLReg + 1, onLReg + 2, onLReg + 3
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}
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const (
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// ALLLED is channel that selects registries to control all leds. Use with function LED
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ALLLED = 0xfa
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// PRESCALE Prescaling byte
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PRESCALE byte = 0xFE
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)
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