File content as of revision 4:cea8cd2c44e4:

#include "mbed.h"
#include "SerialDriver.h"
#include "NeoStrip.h"
#include "gt.h"
 
#define NUM_INDIVIDUALS 7
#define NUM_RING 16
#define NUM_GRID 40
#define NUM_ROWS 5
#define NUM_COLUMNS 8

SerialDriver rpi(p9, p10);
SerialDriver pc(USBTX, USBRX);
DigitalOut myled(LED1);
NeoStrip strip(p18, NUM_INDIVIDUALS + NUM_RING + NUM_GRID);
Ticker t;

int ring_position = 0;
int grid_col = 0;

int flash();
void set_pattern(NeoStrip strip, uint8_t r, uint8_t g, uint8_t b);
void update_pixels();

int main() {
    pc.printf("MBED: startup\r\n");
    
    set_pattern(strip, 255, 255, 255);
    
    t.attach(&update_pixels, 0.05);
    
    // setup serial port
    rpi.baud(115200);
    
    char* line_buffer = (char*) malloc(100*sizeof(char));
    
    char c = rpi.getc();
    int pos = 0;
    
    while (c != '\n' && c != '\r') {
        pc.printf("MBED: read %c\r\n", c);
        line_buffer[pos] = c;
        c = rpi.getc();
        pos++;
    }
    
    line_buffer[pos] = '\0';
    pc.printf("MBED: read newline\r\n");
    
    rpi.printf("ack\n");
    pc.printf("MBED: sent ack\r\n");
    
    int result = strcmp(line_buffer, "hello");
    
    if (result == 0) {
        pc.printf("MBED: matched, updating strip\r\n");
        set_pattern(strip, 255, 0, 0);
    } else {
        pc.printf("Did not match.\n");
        pc.printf(line_buffer);
    }
}


int flash() {
    while(1) {
        myled = 1;
        wait(0.2);
        myled = 0;
        wait(0.2);
    }
}

void set_pattern(NeoStrip strip, uint8_t r, uint8_t g, uint8_t b) {
    strip.setBrightness(0.05);
    //strip.setPixels(0, N, gt_img);
    for (int p = 0; p < 64; p++) {
        strip.setPixel(p, r, g, b);
    }
    strip.write();
}

void update_pixels() {
    strip.setBrightness(0.05);
    // update ring
    strip.setPixel(NUM_INDIVIDUALS + ring_position, 255, 255, 255);
    ring_position = (ring_position + 1) % NUM_RING;
    strip.setPixel(NUM_INDIVIDUALS + ring_position, 255, 0, 0);
    
    // update grid
    for (int i = grid_col; i < NUM_GRID; i += NUM_COLUMNS) {   
        strip.setPixel(NUM_INDIVIDUALS + NUM_RING + i, 255, 255, 255);
    }
    grid_col = (grid_col + 1) % NUM_COLUMNS;
    
    for (int i = grid_col; i < NUM_GRID; i += NUM_COLUMNS) {   
        strip.setPixel(NUM_INDIVIDUALS + NUM_RING + i, 255, 0, 0);
    }
    
    strip.write();    
}