3. How to drive APA102 FastLED through Pa.HUB port extender?

How to drive APA102 FastLED through Pa.HUB port extender?

  • V

    Hello all together,
    I’m new with the M5 ecosystem and very inspired from this devices.

    Now I’m working on a project to control an APA102 digital LED stripe by two TOF distance sensors by Arduino. The APA102 and the two TOF sensors are connected by a PaHUB to a M5stickC Grove port. I’s no problem to read the distances from this sensors through the port extender.

    But how I can tell to the FastLED library to use the two I/O pins of the PaHUB Ch.0 to drive the LED stripe?

    Thank you very much for any hints.

    Greetings from Berlin in Germany
    Vaiolux

    My code:

    // the setup routine runs once when M5Stack starts up
#include <M5StickC.h>
#include <Wire.h>
#include <FastLED.h>

// Defines for VL53L0X TOF sensor
#define VL53L0X_REG_IDENTIFICATION_MODEL_ID         0xc0
#define VL53L0X_REG_IDENTIFICATION_REVISION_ID      0xc2
#define VL53L0X_REG_PRE_RANGE_CONFIG_VCSEL_PERIOD   0x50
#define VL53L0X_REG_FINAL_RANGE_CONFIG_VCSEL_PERIOD 0x70
#define VL53L0X_REG_SYSRANGE_START                  0x00
#define VL53L0X_REG_RESULT_INTERRUPT_STATUS         0x13
#define VL53L0X_REG_RESULT_RANGE_STATUS             0x14
#define address 0x29                                         //the iic address of tof
byte gbuf[16];
uint16_t distance1 = 0;
uint16_t distance2 = 0;

// Defines for Pa.HUB
#define PaHub_I2C_ADDRESS 0X77

// Defines for FastLED
// Use if you want to force the software SPI subsystem to be used for some reason (generally, you don't)
#define FASTLED_FORCE_SOFTWARE_SPI
// Use if you want to force non-accelerated pin access (hint: you really don't, it breaks lots of things)
// #define FASTLED_FORCE_SOFTWARE_SPI
// #define FASTLED_FORCE_SOFTWARE_PINS

// Defines for APA102 LED strip
#define NUM_LEDS 10    // How many leds are in the strip?
#define DATA_PIN 32    // Data pin that led data will be written out over
#define CLOCK_PIN 33   // Clock pin only needed for SPI based chipsets when not using hardware SPI
CRGB leds[NUM_LEDS];   // This is an array of leds.  One item for each led in your strip.

void setup() {

 M5.begin();          // Initialize the M5Stack object
 Wire.begin();        // join i2c bus (address optional for master)    

 // Uncomment one of the following lines for your leds arrangement.
 FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN, BGR>(leds, NUM_LEDS);
 //FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN, BGR, DATA_RATE_MHZ(12)>(leds, NUM_LEDS);

 // LCD display
 M5.Lcd.setRotation(1);
 M5.Lcd.setTextSize(2);
 M5.Lcd.setTextColor(BLACK);
}

void portselectall(uint8_t ports) {  
 Wire.beginTransmission(PaHub_I2C_ADDRESS);
 Wire.write(ports&0x3f);
 Wire.endTransmission(); 
}
void portselect(uint8_t i) {
 if (i > 7) return;
 Wire.beginTransmission(PaHub_I2C_ADDRESS);
 Wire.write(1 << i);
 Wire.endTransmission(); 
}

void led_strip() {
  // Move a single  led 
  for(int LedPix = 0; LedPix < NUM_LEDS; LedPix = LedPix + 1) {
 
     leds[LedPix] = CRGB::HotPink;
     FastLED.setBrightness(50);
   
     // Show the leds (only one)
     FastLED.show();
     // Wait a little bit
     delay(50);
     // Turn our current led back to black for the next loop around
     leds[LedPix] = CRGB::Black;
  }
}

void loop() {
 portselect(1);        //Hub range is 0 to 5
 delay(10);
 distance1 = tof_reed();
 portselect(2);        //Hub range is 0 to 5
 delay(10);
 distance2 = tof_reed();
    
 M5.Lcd.fillScreen(0xFF8000);
 M5.Lcd.setCursor(0, 0, 1);
 M5.Lcd.printf("D1:%d ",distance1);
 M5.Lcd.setCursor(0, 15, 1);
 M5.Lcd.printf("D2:%d ",distance2);

 portselect(0);        //Hub range is 0 to 5
 delay(10);  
 led_strip();

}
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