Tc97 lan / Mbed 2 deprecated xiugai

xiugai

Dependencies:   mbed

PCA9685.cpp@2:73237ebf0640, 2019-10-24 (annotated)

Committer:
lant19
Date:
Thu Oct 24 08:21:43 2019 +0000
Revision:
2:73237ebf0640
Parent:
0:c7f4744deec3
Child:
3:970c2fa6ef3f
xiugai

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreamworker 0:c7f4744deec3 1 #include "PCA9685.h"
dreamworker 0:c7f4744deec3 2 #include "mbed.h"
lant19 2:73237ebf0640 3 PCA9685::PCA9685(PinName sda, PinName scl) : i2c(sda, scl) {}
lant19 2:73237ebf0640 4 //定义引脚与地址
lant19 2:73237ebf0640 5 void PCA9685::begin(void)//初始化
dreamworker 0:c7f4744deec3 6 {
dreamworker 0:c7f4744deec3 7 reset();
dreamworker 0:c7f4744deec3 8 }
dreamworker 0:c7f4744deec3 9
lant19 2:73237ebf0640 10 void PCA9685::frequencyI2C(int freq)//初始化
dreamworker 0:c7f4744deec3 11 {
dreamworker 0:c7f4744deec3 12 i2c.frequency(freq);
dreamworker 0:c7f4744deec3 13 }
lant19 2:73237ebf0640 14 void PCA9685::write8(uint8_t address, uint8_t data)//写函数
dreamworker 0:c7f4744deec3 15 {
dreamworker 0:c7f4744deec3 16 char cmd[2];
dreamworker 0:c7f4744deec3 17 cmd[0] = address;
dreamworker 0:c7f4744deec3 18 cmd[1] = data;
dreamworker 0:c7f4744deec3 19 i2c.write(_i2caddr, cmd, 2);
dreamworker 0:c7f4744deec3 20 }
dreamworker 0:c7f4744deec3 21
lant19 2:73237ebf0640 22 char PCA9685::read8(char address)//读函数
dreamworker 0:c7f4744deec3 23 {
dreamworker 0:c7f4744deec3 24 i2c.write(_i2caddr, &address, 1);
dreamworker 0:c7f4744deec3 25 char rtn;
dreamworker 0:c7f4744deec3 26 i2c.read(_i2caddr, &rtn, 1);
dreamworker 0:c7f4744deec3 27 return rtn;
dreamworker 0:c7f4744deec3 28 }
dreamworker 0:c7f4744deec3 29
lant19 2:73237ebf0640 30 void PCA9685::reset(void)//复位
dreamworker 0:c7f4744deec3 31 {
dreamworker 0:c7f4744deec3 32 write8(PCA9685_MODE1, 0x0);
dreamworker 0:c7f4744deec3 33 }
lant19 2:73237ebf0640 34 void PCA9685::setPrescale(uint8_t prescale) {
dreamworker 0:c7f4744deec3 35 uint8_t oldmode = read8(PCA9685_MODE1);
dreamworker 0:c7f4744deec3 36 uint8_t newmode = (oldmode&0x7F) | 0x10; // sleep
dreamworker 0:c7f4744deec3 37 write8(PCA9685_MODE1, newmode); // go to sleep
dreamworker 0:c7f4744deec3 38 wait_ms(5);
lant19 2:73237ebf0640 39 write8(PCA9685_PRESCALE, prescale); // 设置预缩放
dreamworker 0:c7f4744deec3 40 write8(PCA9685_MODE1, oldmode);
dreamworker 0:c7f4744deec3 41 wait_ms(5);
dreamworker 0:c7f4744deec3 42 write8(PCA9685_MODE1, oldmode | 0xa1);
dreamworker 0:c7f4744deec3 43 }
lant19 2:73237ebf0640 44 void PCA9685::setPWMFreq(float freq) //设置频率
dreamworker 0:c7f4744deec3 45 {
dreamworker 0:c7f4744deec3 46 float prescaleval = 25000000;
dreamworker 0:c7f4744deec3 47 prescaleval /= 4096;
dreamworker 0:c7f4744deec3 48 prescaleval /= freq;
dreamworker 0:c7f4744deec3 49 uint8_t prescale = floor(prescaleval + 0.5) - 1;
dreamworker 0:c7f4744deec3 50 setPrescale(prescale);
dreamworker 0:c7f4744deec3 51 }
dreamworker 0:c7f4744deec3 52
lant19 2:73237ebf0640 53 void PCA9685::setPWM(uint8_t num, uint16_t on, uint16_t off,int addr)
dreamworker 0:c7f4744deec3 54 {
lant19 2:73237ebf0640 55 _i2caddr=addr;
dreamworker 0:c7f4744deec3 56 char cmd[5];
dreamworker 0:c7f4744deec3 57 cmd[0] = LED0_ON_L + 4 * num;
dreamworker 0:c7f4744deec3 58 cmd[1] = on;
dreamworker 0:c7f4744deec3 59 cmd[2] = on >> 8;
dreamworker 0:c7f4744deec3 60 cmd[3] = off;
dreamworker 0:c7f4744deec3 61 cmd[4] = off >> 8;
dreamworker 0:c7f4744deec3 62 i2c.write(_i2caddr, cmd, 5);
dreamworker 0:c7f4744deec3 63 }