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Add setMultiplePWM() function #103

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Add setMultiplePWM() function #103

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90cc5f0
Adds setMultiplePWM
runeharlyk Mar 29, 2025
7f1fbc2
Updates pwm test to use setMultiplePWM
runeharlyk Mar 29, 2025
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39 changes: 38 additions & 1 deletion Adafruit_PWMServoDriver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@

#include "Adafruit_PWMServoDriver.h"

//#define ENABLE_DEBUG_OUTPUT
// #define ENABLE_DEBUG_OUTPUT

/*!
* @brief Instantiates a new PCA9685 PWM driver chip with the I2C address on a
Expand Down Expand Up @@ -361,6 +361,43 @@ void Adafruit_PWMServoDriver::setOscillatorFrequency(uint32_t freq) {
_oscillator_freq = freq;
}

/*!
* @brief Sets the PWM output for multiple channels
* @param values Array of PWM values (0-4095) for each channel
* @param length Length of the array, from 1 to 16
* @return 0 if successful, otherwise 1
*/
uint8_t Adafruit_PWMServoDriver::setMultiplePWM(uint16_t *values,
uint8_t length) {
if (length > 16)
length = 16;
uint8_t totalBytes = 1 + 4 * length;

uint8_t buffer[totalBytes];
buffer[0] = PCA9685_LED0_ON_L;
uint8_t *b = buffer + 1;

for (uint8_t i = 0; i < length; i++, b += 4) {
uint16_t val = values[i] > 4095 ? 4095 : values[i];
b[0] = 0;
if (val == 0) {
b[1] = 0;
b[2] = 0;
b[3] = MODE1_SLEEP;
} else if (val == 4095) {
b[1] = MODE1_SLEEP;
b[2] = 0;
b[3] = 0;
} else {
b[1] = 0;
b[2] = val & 0xFF;
b[3] = val >> 8;
}
}

return i2c_dev->write(buffer, totalBytes) ? 0 : 1;
}

/******************* Low level I2C interface */
uint8_t Adafruit_PWMServoDriver::read8(uint8_t addr) {
uint8_t buffer[1] = {addr};
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1 change: 1 addition & 0 deletions Adafruit_PWMServoDriver.h
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Expand Up @@ -86,6 +86,7 @@ class Adafruit_PWMServoDriver {
void setOutputMode(bool totempole);
uint16_t getPWM(uint8_t num, bool off = false);
uint8_t setPWM(uint8_t num, uint16_t on, uint16_t off);
uint8_t setMultiplePWM(uint16_t *values, uint8_t length);
void setPin(uint8_t num, uint16_t val, bool invert = false);
uint8_t readPrescale(void);
void writeMicroseconds(uint8_t num, uint16_t Microseconds);
Expand Down
8 changes: 5 additions & 3 deletions examples/pwmtest/pwmtest.ino
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Expand Up @@ -58,10 +58,12 @@ void setup() {

void loop() {
// Drive each PWM in a 'wave'
for (uint16_t i=0; i<4096; i += 8) {
for (uint8_t pwmnum=0; pwmnum < 16; pwmnum++) {
pwm.setPWM(pwmnum, 0, (i + (4096/16)*pwmnum) % 4096 );
uint16_t pwmValues[16];
for (uint16_t i = 0; i < 4096; i += 8) {
for (uint8_t pwmnum = 0; pwmnum < 16; pwmnum++) {
pwmValues[pwmnum] = (i + (4096 / 16) * pwmnum) % 4096;
}
pwm.setMultiplePWM(pwmValues, 16);
#ifdef ESP8266
yield(); // take a breather, required for ESP8266
#endif
Expand Down
1 change: 1 addition & 0 deletions keywords.txt
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Expand Up @@ -17,6 +17,7 @@ setPWMFreq KEYWORD2
setOutputMode KEYWORD2
getPWM KEYWORD2
setPWM KEYWORD2
setMultiplePWM KEYWORD2
setPin KEYWORD2
readPrescale KEYWORD2
writeMicroseconds KEYWORD2
Expand Down