microbit fork
Dependents: demoMicroBit_PCA9685
Fork of PCA9685PWM by
Diff: MicroBitPCA9685.h
- Revision:
- 2:429b0b439bc1
diff -r 7f3c3ac6b20b -r 429b0b439bc1 MicroBitPCA9685.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MicroBitPCA9685.h Fri Jan 13 21:00:21 2017 +0000 @@ -0,0 +1,110 @@ +/**Library for PCA9685 16-channel, 12-bit PWM Fm+ I²C-bus LED controller +* Example code +* @code +* +*#include"PCA9685.h" +*#include"mbed.h" +* +* +* +*PCA9685 pwm(D14,D15); +* +*void setServoPulse(uint8_t n, float pulse) { +* float pulselength = 10000; // 10,000 units per seconds +* pulse = 4094 * pulse / pulselength; +* pwm.setPWM(n, 0, pulse); +*} +* +*void initServoDriver() { +* pwm.begin(); +* pwm.setPrescale(64); //This value is decided for 10ms interval. +* pwm.frequencyI2C(400000); //400kHz +*} +* +* int main() { +* +* while(1){ +* initServoDriver(); +* wait(0.2); +* setServoPulse(0, 2300); +* setServoPulse(1, 500); +* wait(0.5);//delay necessary to perform the action +* setServoPulse(0, 1350); +* setServoPulse(1, 1350); +* wait(0.5); +* setServoPulse(0,550); +* setServoPulse(1, 2250); +* wait(0.5); +* setServoPulse(0, 2300); +* wait(2); +* for (int mov = 550; mov < 2300; mov++){ +* setServoPulse(0, mov); +* wait(0.001); +* } +* for (int mov = 500; mov < 2200; mov++){ +* setServoPulse(1, mov); +* wait(0.001); +* } +* } +*} +*@endcode +* +*/ +#ifndef MicroBitPCA9685_H +#define MicroBitPCA9685_H + +#include <cmath> +//register definitions +#define PCA9685_SUBADR1 0x2 +#define PCA9685_SUBADR2 0x3 +#define PCA9685_SUBADR3 0x4 + +#define PCA9685_MODE1 0x0 +#define PCA9685_PRESCALE 0xFE + +#define LED0_ON_L 0x6 +#define LED0_ON_H 0x7 +#define LED0_OFF_L 0x8 +#define LED0_OFF_H 0x9 + +#define ALLLED_ON_L 0xFA +#define ALLLED_ON_H 0xFB +#define ALLLED_OFF_L 0xFC +#define ALLLED_OFF_H 0xFD + + +class MicroBitPCA9685 +{ +public: + MicroBitPCA9685(MicroBitI2C& _i2c, uint8_t addr = 0x40); + void frequencyI2C(int freq); + void begin(void); //Initialize the controller + void reset(void); //Reset the controller + void setPrescale(uint8_t prescale);//setPrescale(prescale) + /** Set prescale + * + * @param prescale: set scale for the PWM frequency + * + */ + void setPWMFreq(float freq);//Set the pwm frequency + /** Set frequency + * + * @param frequency in Hz + * + */ + int setPWM(uint8_t num, uint16_t on, uint16_t off);//SetPWM(channel, on, off) + /** Set the start (on) and the end (off) of the part of the PWM pulse of the channel + * @param channel : from 0 to 15 the channel the should be update + * @param on: from 0 to 4095 the tick when the signal should pass from low to high + * @param off: from 0 to 4095 the tick when the signal should pass from high to low + */ + + int setAllPWM(uint16_t on, uint16_t off); +private: + int write8(uint8_t address, uint8_t data); + char read8(char address); + uint8_t _i2caddr; + MicroBitI2C& i2c; +}; + +#endif \ No newline at end of file