Example for use with micro:bit

[joachimhs]

Hello,

I am attemting to use this library for driving NeoPixel LEDs. I notice that the .c file has a uBitPinMap, that maps to 3, 2 and 1. However I am unable to get this to work.

This is the code I am attempting to use. Ideally, I would like to use P12 on the micro:bit to drive the NeoPixels. Or even better, to be able to select an available pin in the code.

`#include "MicroBit.h"
#include "ubit-neopixel/uBit_neopixel.h"

MicroBit uBit;
MicroBitImage defaultImage(5, 5);

neopixel_strip_t m_strip;
uint8_t dig_pin_num = 2;

void setup() {
neopixel_init(&m_strip, 12, 64);
neopixel_clear(&m_strip);
}

void loop() {
neopixel_set_color(&m_strip, 10, 255,0,0);
neopixel_show(&m_strip);
uBit.sleep(500);
}

int main() {
uBit.init();
setup();
while (1) {
loop();
}
}`

[joachimhs]

I changed the code in the ubit-neopixel.c file to:

void neopixel_init(neopixel_strip_t *strip, uint8_t pin_num, uint16_t num_leds)
{
//    int uBitPinMap [3] = {3,2,1}; // micro:bit pin numbers are named differently to the hardware numbers
    strip->leds = (color_t*) malloc(sizeof(color_t) * num_leds);
    strip->pin_num = pin_num;//[pin_num];
    strip->num_leds = num_leds;
    nrf_gpio_cfg_output(pin_num);
    NRF_GPIO->OUTCLR = (1UL << pin_num);
    for (int i = 0; i < num_leds; i++)
    {   
        strip->leds[i].simple.g = 0;
        strip->leds[i].simple.r = 0;
        strip->leds[i].simple.b = 0;
    }
}

And then, from the micro:bit code I used:

neopixel_init(&m_strip, MICROBIT_PIN_P1, 64);

This works somewhat, but the display acts strange where the pixels I do specify to light up does , but when I call uBit.sleep(500); the whole screen lights up for half a second.