Diff: MicroBitPCA9685.cpp

Revision:

2:429b0b439bc1

Parent:

0:c7f4744deec3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MicroBitPCA9685.cpp	Fri Jan 13 21:00:21 2017 +0000
@@ -0,0 +1,77 @@
+#include "MicroBit.h"
+#include "MicroBitPCA9685.h"
+
+MicroBitPCA9685::MicroBitPCA9685(MicroBitI2C& _i2c, uint8_t addr) : i2c(_i2c), _i2caddr(addr) {}
+
+void MicroBitPCA9685::begin(void)
+{
+    reset();
+}
+
+void MicroBitPCA9685::frequencyI2C(int freq)
+{
+    i2c.frequency(freq);
+}
+int MicroBitPCA9685::write8(uint8_t address, uint8_t data)
+{
+    char cmd[2];
+    cmd[0] = address;
+    cmd[1] = data;
+    return i2c.write(_i2caddr, cmd, 2);
+}
+
+char MicroBitPCA9685::read8(char address)
+{
+    i2c.write(_i2caddr, &address, 1);
+    char rtn;
+    i2c.read(_i2caddr, &rtn, 1);
+    return rtn;
+}
+
+void MicroBitPCA9685::reset(void)
+{
+    write8(PCA9685_MODE1, 0x0);
+}
+void MicroBitPCA9685::setPrescale(uint8_t prescale) {
+    uint8_t oldmode = read8(PCA9685_MODE1);
+    uint8_t newmode = (oldmode&0x7F) | 0x10; // sleep
+    write8(PCA9685_MODE1, newmode); // go to sleep
+    wait_ms(5);
+    write8(PCA9685_PRESCALE, prescale); // set the prescaler
+    write8(PCA9685_MODE1, oldmode);
+    wait_ms(5);
+    write8(PCA9685_MODE1, oldmode | 0xa1);
+}
+void MicroBitPCA9685::setPWMFreq(float freq)
+{
+    float prescaleval = 25000000;
+    prescaleval /= 4096;
+    prescaleval /= freq;
+    uint8_t prescale = floor(prescaleval  + 0.5) - 1;
+    setPrescale(prescale);
+}
+
+int MicroBitPCA9685::setPWM(uint8_t num, uint16_t on, uint16_t off)
+{
+    char cmd[5];
+    cmd[0] = LED0_ON_L + 4 * num;
+    cmd[1] = on;
+    cmd[2] = on >> 8;
+    cmd[3] = off;
+    cmd[4] = off >> 8;
+    return i2c.write(_i2caddr, cmd, 5);
+}
+
+
+ 
+
+int MicroBitPCA9685::setAllPWM(uint16_t on, uint16_t off)
+{
+    char cmd[5];
+    cmd[0] = ALLLED_ON_L;
+    cmd[1] = on;
+    cmd[2] = on >> 8;
+    cmd[3] = off;
+    cmd[4] = off >> 8;
+    return i2c.write(_i2caddr, cmd, 5);
+}
\ No newline at end of file