Hmmm... and yet the code is behaving as if the value isn't being rotated but shifted
The code moves a Pacman ghost across a 16x16 LED panel. I'm trying to change the colour of the next ghost by checking against the colours bit sequence stored as a uint32_t I'm expecting the colours variable to rotate along with the rest of the sprite but it just ends up full of 0s.
Full code listing,
#include <FastLED.h>
#include <stdint.h>
#define LED_PIN 7
#define NUM_LEDS 256
#define INT_BITS 16
#define INT_BITS_32 32
CRGB leds[NUM_LEDS];
int r = 255;
int g = 0;
int b = 0;
int cols[3][3] = {
{60, 0, 0},
{0, 60, 0},
{0, 0, 60}
};
int col_sign = 1;
int col_cnt = 0;
int shift = 0;
int eye_dir_flg = 0;
uint16_t colours = 0b1111111111111111;
uint16_t ghost_bk[16] = {
0b0000000000000000,
0b0000001111000000,
0b0000111111110000,
0b0001111111111000,
0b0001111111111000,
0b0011111111111100,
0b0011111111111100,
0b0111111111111110,
0b0111111111111110,
0b0111111111111110,
0b0111111111111110,
0b0111111111111110,
0b0110111001110110,
0b0100011001100010,
0b0000000000000000,
0b0000000000000000
};
uint16_t eyes_lt[16] = {
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000011000011000,
0b0000111100111100,
0b0000111100111100,
0b0000111100111100,
0b0000011000011000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000
};
uint16_t pup_lt[16] = {
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000001100001100,
0b0000001100001100,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000
};
uint16_t eyes_rt[16] = {
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0001100001100000,
0b0011110011110000,
0b0011110011110000,
0b0011110011110000,
0b0001100001100000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000
};
uint16_t pup_rt[16] = {
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0011000011000000,
0b0011000011000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000,
0b0000000000000000
};
uint16_t temp_ghost_bk[16];
uint16_t temp_eyes_lt[16];
uint16_t temp_pup_lt[16];
uint16_t temp_eyes_rt[16];
uint16_t temp_pup_rt[16];
int panel[16][16] = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
{31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16},
{32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47},
{63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48},
{64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79},
{95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80},
{96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111},
{127, 126, 125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 114, 113, 112},
{128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143},
{159, 158, 157, 156, 155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 144},
{160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175},
{191, 190, 189, 188, 187, 186, 185, 184, 183, 182, 181, 180, 179, 178, 177, 176},
{192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207},
{223, 222, 221, 220, 219, 218, 217, 216, 215, 214, 213, 212, 211, 210, 209, 208},
{224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239},
{255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240}
};
void setup()
{
Serial.begin(9600);
FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
clear_all();
for(int i = 0; i < 16; i++)
{
temp_ghost_bk[i] = ghost_bk[i];
temp_eyes_lt[i] = eyes_lt[i];
temp_pup_lt[i] = pup_lt[i];
temp_eyes_rt[i] = eyes_rt[i];
temp_pup_rt[i] = pup_rt[i];
}
}
void loop()
{
// Clear all
for(int i = 0; i < NUM_LEDS; i++)
{
leds[i] = CRGB(0, 0, 0);
}
for(int i = 0; i < 16; i++)
{
for(int j = 0; j < 16; j++)
{
if(temp_ghost_bk[i] & (1U << j))
{
/* Added conditional */
if(colours & (1U << j))
{
leds[panel[i][j]] = CRGB(0, 0, 120);
}
else
{
leds[panel[i][j]] = CRGB(120, 0, 0);
}
/* End of added conditional */
}
if(eye_dir_flg == 0)
{
if(temp_eyes_lt[i] & (1U << j))
{
leds[panel[i][j]] = CRGB(30, 30, 30);
}
if(temp_pup_lt[i] & (1U << j))
{
leds[panel[i][j]] = CRGB(0, 0, 0);
}
}
else
{
if(temp_eyes_rt[i] & (1U << j))
{
leds[panel[i][j]] = CRGB(30, 30, 30);
}
if(temp_pup_rt[i] & (1U << j))
{
leds[panel[i][j]] = CRGB(0, 0, 0);
}
}
}
temp_ghost_bk[i] = leftRotate(temp_ghost_bk[i], 1);
temp_eyes_lt[i] = leftRotate(temp_eyes_lt[i], 1);
temp_pup_lt[i] = leftRotate(temp_pup_lt[i], 1);
temp_eyes_rt[i] = leftRotate(temp_eyes_rt[i], 1);
temp_pup_rt[i] = leftRotate(temp_pup_rt[i], 1);
}
colours = leftRotate_uint32(colours, 1);
Serial.println(colours, BIN);
FastLED.show();
delay(500);
if(eye_dir_flg == 0)
{
eye_dir_flg = 1;
}
else
{
eye_dir_flg = 0;
}
}
void clear_all()
{
for(int i = 0; i < NUM_LEDS; i++)
{
leds[i] = CRGB(0, 0, 0);
}
FastLED.show();
}
/* rotate n by d bits*/
int leftRotate(uint16_t n, uint16_t d)
{
return (n << d) | (n >> (INT_BITS - d));
}
int rightRotate(uint16_t n, uint16_t d)
{
return (n >> d) | (n << (INT_BITS - d));
}
uint32_t leftRotate_uint32(uint32_t n, uint32_t d)
{
return (n << d) | (n >> (INT_BITS_32 - d));
}
// return (val << 1) | (val >> 31);
uint32_t rightRotate_int32(uint32_t n, uint32_t d)
{
return (n >> d) | (n << (INT_BITS_32 - d));
}
