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Christian Dupaty 10/2021
IS31FL3731 with CHARLIEPLEX LED MATRIX adaptation from Adafruit project to ARM MBEB, tested on NUCLEO L073RZ
for original project on Arduino see https://learn.adafruit.com/animated-flame-pendant/overview
The program reads the data from an images file and places it alternately on pages 0 and 1 of IS31FL3731
Data structure in data.h :
first byte x1 PF and y1 pf, second byte x2 PF and y2 pf
loop from x1 to x2
loop from y1 to y2
copy from the third byte into the img buffer (144 bytes)
void loop()
{
uint8_t a, x1, y1, x2, y2, x, y,s;
#ifdef debug
printf("-------------------------------------------------------------\n");
printf("start loop\n");
printf("-------------------------------------------------------------\n");
#endif
pageSelect(0x0B); // Function registers
cmd[0]=0x01; // Picture Display reg
cmd[1]=page;
Wire.write(I2C_ADDR,cmd,2);
page ^= 1; // Flip front/back buffer index
// Then render NEXT frame. Start by getting bounding rect for new frame:
a = *ptr++; // New frame X1/Y1
if(a >= 144) // 0x90
{
// EOD marker? (valid X1 never exceeds 8)
ptr = anim; // Reset animation data pointer to start
a = *ptr++; // and take first value
}
x1 = a >> 4; // X1 = high 4 bits
y1 = a & 0x0F; // Y1 = low 4 bits
a = *ptr++; // New frame X2/Y2
x2 = a >> 4; // X2 = high 4 bits
y2 = a & 0x0F; // Y2 = low 4 bits
// Read rectangle of data from anim[] into portion of img[] buffer
#ifdef debug
printf("x1= %d y1= %d x2= %d y2 = %d \n",x1,y1,x2,y2);
#endif
for(x=x1; x<=x2; x++) {
// Column-major
for(y=y1; y<=y2; y++)
{
img[(x << 4) + y] = *ptr++;
#ifdef debug
printf("x= %d y= %d data= %d \n",x,y,img[(x << 4) + y]);
#endif
}
}
// Write img[] to matrix (not actually displayed until next pass)
pageSelect(page); // Select background buffer
s=0;
cmd[0]=0x24; // First byte of PWM data
s++;
// copy img buffer to IS31FL3731
for(uint8_t j=0; j<144; j++)
{
cmd[j+1]=img[j];
s++;
#ifdef debug
printf("j= %d img[j]= %d \n",j,img[j]);
#endif
}
Wire.write(I2C_ADDR,cmd,s);
wait_ms(30); // can be adjuted for speed annimation
}