catdogmouse tvout
Slayr
5 years ago
commit
8f306b1bda
@ -0,0 +1,137 @@
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/*
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* good old starfield
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*
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* The way this one works is by first filling the screen with pixels at
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* random coordinates. Then at each frame we calculate the new position of
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* each pixel as if it was going away from the center of the screen. When a
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* pixel is going off screen, it is reassigned at a new random position.
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* To simulate a bit of depth, some pixels move twice as fast.
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*
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* Limitations: all the pixels/stars coordinates are stored in float arrays.
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* Each float is 4 bytes in size (32 bits) and the Nano has 2 KB of SRAM.
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* For each pixel/star we need to store 4 floats: x, y, vx, vy. That's
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* 16 bytes per pixel/star, so we should be able to store quite few.
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* However, the SRAM is already used by other parts of the code, and TVout.
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* In practice with the current implementation, there's just enough free
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* memory left for 25 pixels/stars :(
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*
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* See starfield51 for a modification that allows to have 51 stars :)
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*/
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#include <TVout.h>
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TVout TV;
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#define STARS 25
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float x[STARS]; // x coordinates of all the stars
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float y[STARS]; // y coordinates of all the stars
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float vx[STARS]; // vx and vy are the increments that we add to x
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float vy[STARS]; // and y at each frame to get the x,y position
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/*
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* new_star(i) generates the x, y, vx, and vy values for star i
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* x is generated at random x-axis position around the centre
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* y is generated at random y-axis position around the centre
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* we calculate the distances dx and dy from the screen center ox,oy
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* (we cheat a bit to make sure no 0 are left in a division later on)
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* we use dx and dy to calculte the distance vl between the star
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* and the center, ie the magnitude of the vector (center, star)
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* we use the magnitude to normalize the vector, namely calculating
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* the normalized components vx and vy
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*/
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void
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new_star(uint8_t i)
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{
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uint8_t ox = 60;
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uint8_t oy = 48;
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float dx, dy, vl;
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x[i] = 30 + random(60);
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y[i] = 24 + random(48);
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dx = x[i] - ox;
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dy = y[i] - oy;
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switch(int(dx))
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case 0: dx = 1; // CHEAT
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vl = sqrt(dx*dx + dy*dy);
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vx[i] = dx / vl;
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vy[i] = dy / vl;
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}
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/*
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* new_stars() creates as many stars as set by the STARS constant
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*/
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void
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new_stars()
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{
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for (uint8_t i = 0; i < STARS; i++)
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new_star(i);
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}
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/*
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* Nothing exciting here, we initialize the PRNG with some noise,
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* configure TV out, and generate coordinates for all stars.
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*/
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void
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setup()
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{
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randomSeed(analogRead(6)); // effective?
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TV.begin(NTSC,120,96);
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new_stars();
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}
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/*
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* update_stars() goes through all the x and y values and update
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* them in such a way that:
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* new x = current x + vx
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* new y = current y + vy
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* we also test if the new coordinates of the star are still in the
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* visible part of the screen, and if not, we call new_star() to
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* generate new x, y, vx, vy all over again
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* Note: fancy effect, the first 20 stars are updated with regular
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* vx and vy values, while the last 5 are a updated with 2 times vx and vy,
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* which means that these 5 last stars will move twice the speed.
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*/
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void
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update_stars()
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{
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for (uint8_t i = 0; i < 20; i++) {
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x[i] = x[i] + vx[i];
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y[i] = y[i] + vy[i];
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if (x[i] > 120 || x[i] < 0 || y[i] < 0 || y[i] > 96)
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new_star(i);
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}
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for (uint8_t i = 20; i < STARS; i++) {
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x[i] = x[i] + vx[i] * 2;
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y[i] = y[i] + vy[i] * 2;
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if (x[i] > 120 || x[i] < 0 || y[i] < 0 || y[i] > 96)
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new_star(i);
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}
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}
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/*
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* draw_stars() walks through the x and y coordinates arrays and
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* uses the value to draw a pixel for each star
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*/
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void
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draw_stars()
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{
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for (uint8_t i = 0; i < STARS; i++)
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TV.set_pixel(x[i], y[i], 1);
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}
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/*
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* loop() is stuck doing the same stuff forever because it dared to trick
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* the gods...
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*/
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void
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loop()
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{
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TV.delay_frame(1);
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update_stars();
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TV.clear_screen();
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draw_stars();
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}
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@ -0,0 +1,107 @@
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/*
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* good old starfield - PASTIS 51 EDITION + CAPTAIN MOD
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*
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* Same as starfield51 but this time we can control the origin with POT 1 and
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* POT2, which affects all the newly created stars, allowing for deep space
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* travel.
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*
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* Really not optimised in current state, even though I tried to simplify things.
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* But it starts to push the chip beyond its capacity, so it feels a bit sluggish now.
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* More changes would start to make the thing even less readable so...
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*/
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#include <TVout.h>
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TVout TV;
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#define STARS 51
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#define POT_1 0
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#define POT_2 1
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#define POT_1_MOD 11 // 120/1024 ish int(0.1171875 * 100)
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#define POT_2_MOD 9 // 96/1024 ish
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#define RND_1_MOD 5 // 60/1024 ish
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#define RND_2_MOD 4 // 48/1024 ish
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int x[STARS];
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int y[STARS];
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int vx[STARS];
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int vy[STARS];
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uint8_t ox;
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uint8_t oy;
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void
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setup()
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{
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randomSeed(analogRead(6)); // effective?
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TV.begin(NTSC,120,96);
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new_stars();
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}
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void
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new_star(uint8_t i)
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{
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uint8_t x_tmp, y_tmp;
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int dx, dy, pot1, pot2;
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float vl;
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pot1 = analogRead(POT_1);
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pot2 = analogRead(POT_2);
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ox = pot1 * POT_1_MOD / 100 ;
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oy = pot2 * POT_2_MOD / 100 ;
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x_tmp = pot1 * RND_1_MOD / 100 + random(60);
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y_tmp = pot2 * RND_2_MOD / 100 + random(48);
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dx = x_tmp - ox;
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dy = y_tmp - oy;
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switch(dx)
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case 0: dx = 1; // CHEAT
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vl = 1 / sqrt(dx*dx + dy*dy);
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vx[i] = int(dx * vl * 100);
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vy[i] = int(dy * vl * 100);
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x[i] = x_tmp * 100;
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y[i] = y_tmp * 100;
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}
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void
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new_stars()
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{
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for (uint8_t i = 0; i < STARS; i++)
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new_star(i);
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}
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void
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update_stars()
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{
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for (uint8_t i = 0; i < 40; i++) {
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x[i] = x[i] + vx[i];
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y[i] = y[i] + vy[i];
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if (x[i] > 12000 || x[i] < 0 || y[i] < 0 || y[i] > 9600)
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new_star(i);
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}
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for (uint8_t i = 40; i < STARS; i++) {
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x[i] = x[i] + (vx[i] << 1);
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y[i] = y[i] + (vy[i] << 1);
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if (x[i] > 12000 || x[i] < 0 || y[i] < 0 || y[i] > 9600)
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new_star(i);
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}
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}
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void
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draw_stars()
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{
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for (uint8_t i = 0; i < STARS; i++)
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TV.set_pixel(x[i]/100, y[i]/100, 1);
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}
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void
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loop()
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{
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TV.delay_frame(1);
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update_stars();
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TV.clear_screen();
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draw_stars();
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}
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@ -0,0 +1,112 @@
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/*
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* good old starfield - PASTIS 51 EDITION
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*
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* See starfield25 for context and more comments, otherwise it may not make much
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* sense...
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*
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* So basically the trick used to get more stars here, is not to free memory,
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* because that's not possible, but instead it's to make the stars use less memory.
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* To do that we change the type from float (4 bytes) to int (2 bytes).
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* The tradeoff is of course that now we have integers and not floating point numbers,
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* and that prevents us to have any meaningful results when we calculate vector related
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* stuff. But there's a workaround to this!
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* The workaround is very simple, we use int as floats without floating points, which
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* means that everytime we read from the array we convert the int to float and divide
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* it by an arbitrary precision value (here we use 100), and when we want to store a
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* float we multiply it by the same precision value and convert to int.
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* We loose in accuray, but that does not matter here at all.
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*
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* ex: we want to store 12,345678
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* 12,3456 * 100 = 1234,56
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* int(1234,56) = 1234
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* and converted back
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* float(1234 / 100) = 12,34
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* in the process with this trick we lost 0,005678 (who cares?)
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*
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* Note: most of the changes are in new_star(). There are some minor changes elsewhere,
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* mostly to try optimise things cheaply, ignore.
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*/
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#include <TVout.h>
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TVout TV;
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#define STARS 51
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int x[STARS];
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int y[STARS];
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int vx[STARS];
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int vy[STARS];
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void
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setup()
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{
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randomSeed(analogRead(6)); // effective?
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TV.begin(NTSC,120,96);
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new_stars();
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}
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void
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new_star(uint8_t i)
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{
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uint8_t x_tmp, y_tmp;
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uint8_t ox = 60;
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uint8_t oy = 48;
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int dx, dy;
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float vl;
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x_tmp = 30 + random(60);
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y_tmp = 24 + random(48);
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dx = x_tmp - ox;
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dy = y_tmp - oy;
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switch(dx)
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case 0: dx = 1; // CHEAT
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vl = 1 / sqrt(dx*dx + dy*dy);
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vx[i] = int(dx * vl * 100);
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vy[i] = int(dy * vl * 100);
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x[i] = x_tmp * 100;
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y[i] = y_tmp * 100;
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}
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void
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new_stars()
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{
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for (uint8_t i = 0; i < STARS; i++)
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new_star(i);
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}
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void
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update_stars()
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{
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for (uint8_t i = 0; i < 40; i++) {
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x[i] = x[i] + vx[i];
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y[i] = y[i] + vy[i];
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if (x[i] > 12000 || x[i] < 0 || y[i] < 0 || y[i] > 9600)
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new_star(i);
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}
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for (uint8_t i = 40; i < STARS; i++) {
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x[i] = x[i] + (vx[i] << 1);
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y[i] = y[i] + (vy[i] << 1);
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if (x[i] > 12000 || x[i] < 0 || y[i] < 0 || y[i] > 9600)
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new_star(i);
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}
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}
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void
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draw_stars()
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{
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for (uint8_t i = 0; i < STARS; i++)
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TV.set_pixel(x[i]/100, y[i]/100, 1);
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}
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void
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loop()
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{
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TV.delay_frame(1);
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update_stars();
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TV.clear_screen();
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draw_stars();
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}
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@ -0,0 +1,21 @@
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void setup() {
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//int counter = 0;
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Serial.begin(9600);
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Serial.println("---------------");
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//Serial.println(counter);
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for(int counter = 0; counter < 10; counter++){
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//counter++; [same as counter = counter + 1]
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// counter += 1; [same as counter = counter + 1]
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Serial.println('a', DEC); // get ascii decimal number value for -- a
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Serial.println('HATE');
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Serial.println(counter);
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}
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}
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void loop() {
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// put your main code here, to run repeatedly:
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}
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@ -1,265 +0,0 @@
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/*
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"Tri-Shape", a wave shaping oscilatorfor Ginkosynthese's "grains" module.
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By Kassen Oud
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LICENSE:
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This program is free software: you can redistribute it and/or modify
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|
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it under the terms of the GNU General Public License as published by
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|
||||||
the Free Software Foundation, either version 2 of the License, or
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|
||||||
(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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|
||||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
||||||
GNU General Public License for more details.
|
|
||||||
|
|
||||||
You should have received a copy of the GNU General Public License
|
|
||||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
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||||||
|
|
||||||
DESCRIPION;
|
|
||||||
A triangle-based osclitator with wave-folding and hard-clipping features.
|
|
||||||
|
|
||||||
MANUAL;
|
|
||||||
Knob 1 / mod 1; Wave folding
|
|
||||||
Amplifies the base triangle wave, then once it hits the limits of the
|
|
||||||
range "folds" it back in the opposite direction. With enough
|
|
||||||
amplification this will happen again at the other side, creating a
|
|
||||||
rich spectrum.
|
|
||||||
Knob 2/ mod 2; Hard Cliping
|
|
||||||
Amplifies the signal (after the folding) and clips the result. This is
|
|
||||||
done asymetrically for a "deeper" and more "balsy" sound. Thanks to
|
|
||||||
Rob Bothof for that trick.
|
|
||||||
Knob 3: Base Tuning.
|
|
||||||
Sets the base pitch.
|
|
||||||
Mod 3; Pitch Modulation
|
|
||||||
This CV gets added to the value set by Knob 3.
|
|
||||||
|
|
||||||
*/
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
//the libraries we use
|
|
||||||
#include <avr/io.h>
|
|
||||||
#include <avr/interrupt.h>
|
|
||||||
#include <avr/pgmspace.h>
|
|
||||||
|
|
||||||
//variables
|
|
||||||
uint16_t phase_accumulator; //keeps track of the phase
|
|
||||||
uint16_t phase_inc; //phase increase per sample
|
|
||||||
bool flip = false; //keeps track of the output's polarity
|
|
||||||
uint16_t wrap = 1; // amount of wave-folding
|
|
||||||
uint16_t drive = 32; //amount of clipping for positive signal
|
|
||||||
uint16_t top_drive = 32; //same for negative signal
|
|
||||||
uint16_t output = 127; //the value we write out
|
|
||||||
uint16_t last_out = 127; //last value we wrote out
|
|
||||||
|
|
||||||
// Map inputs
|
|
||||||
#define DRIVE_CONTROL (A1)
|
|
||||||
#define WRAP_CONTROL (A2)
|
|
||||||
#define PITCH_KNOB (A0)
|
|
||||||
#define PITCH_CV (A3)
|
|
||||||
|
|
||||||
// Changing these will also requires rewriting setup()
|
|
||||||
// Output is on pin 11
|
|
||||||
#define PWM_PIN 11
|
|
||||||
#define PWM_VALUE OCR2A
|
|
||||||
#define LED_PORT PORTB
|
|
||||||
#define LED_BIT 5
|
|
||||||
#define PWM_INTERRUPT TIMER2_OVF_vect
|
|
||||||
|
|
||||||
//maps cv to samples of phase increase each time we output a new value
|
|
||||||
//this might need tuning in the future
|
|
||||||
const uint16_t freqTable[] PROGMEM = {
|
|
||||||
69, 69, 69, 69, 70, 70, 70, 70, 70, 71, // 0 to 9
|
|
||||||
71, 71, 71, 72, 72, 72, 72, 73, 73, 73, //
|
|
||||||
73, 74, 74, 74, 74, 75, 75, 75, 75, 76, //
|
|
||||||
76, 76, 76, 77, 77, 77, 77, 78, 78, 78, //
|
|
||||||
78, 79, 79, 79, 79, 80, 80, 80, 81, 81, //
|
|
||||||
81, 81, 82, 82, 82, 82, 83, 83, 83, 84, //
|
|
||||||
84, 84, 84, 85, 85, 85, 86, 86, 86, 86, //
|
|
||||||
87, 87, 87, 88, 88, 88, 88, 89, 89, 89, //
|
|
||||||
90, 90, 90, 91, 91, 91, 91, 92, 92, 92, //
|
|
||||||
93, 93, 93, 94, 94, 94, 95, 95, 95, 96, //
|
|
||||||
96, 96, 97, 97, 97, 97, 98, 98, 98, 99, // 100 to 109
|
|
||||||
99, 99, 100, 100, 100, 101, 101, 101, 102, 102, //
|
|
||||||
102, 103, 103, 104, 104, 104, 105, 105, 105, 106, //
|
|
||||||
106, 106, 107, 107, 107, 108, 108, 109, 109, 109, //
|
|
||||||
110, 110, 110, 111, 111, 111, 112, 112, 113, 113, //
|
|
||||||
113, 114, 114, 114, 115, 115, 116, 116, 116, 117, //
|
|
||||||
117, 118, 118, 118, 119, 119, 120, 120, 120, 121, //
|
|
||||||
121, 122, 122, 122, 123, 123, 124, 124, 124, 125, //
|
|
||||||
125, 126, 126, 127, 127, 127, 128, 128, 129, 129, //
|
|
||||||
130, 130, 130, 131, 131, 132, 132, 133, 133, 134, //
|
|
||||||
134, 134, 135, 135, 136, 136, 137, 137, 138, 138, // 200 to 209
|
|
||||||
139, 139, 139, 140, 140, 141, 141, 142, 142, 143, //
|
|
||||||
143, 144, 144, 145, 145, 146, 146, 147, 147, 148, //
|
|
||||||
148, 149, 149, 150, 150, 151, 151, 152, 152, 153, //
|
|
||||||
153, 154, 154, 155, 155, 156, 156, 157, 157, 158, //
|
|
||||||
158, 159, 159, 160, 161, 161, 162, 162, 163, 163, //
|
|
||||||
164, 164, 165, 165, 166, 167, 167, 168, 168, 169, //
|
|
||||||
169, 170, 171, 171, 172, 172, 173, 173, 174, 175, //
|
|
||||||
175, 176, 176, 177, 178, 178, 179, 179, 180, 181, //
|
|
||||||
181, 182, 182, 183, 184, 184, 185, 185, 186, 187, //
|
|
||||||
187, 188, 189, 189, 190, 190, 191, 192, 192, 193, // 300 to 309
|
|
||||||
194, 194, 195, 196, 196, 197, 198, 198, 199, 200, //
|
|
||||||
200, 201, 202, 202, 203, 204, 204, 205, 206, 206, //
|
|
||||||
207, 208, 208, 209, 210, 211, 211, 212, 213, 213, //
|
|
||||||
214, 215, 216, 216, 217, 218, 218, 219, 220, 221, //
|
|
||||||
221, 222, 223, 224, 224, 225, 226, 227, 227, 228, //
|
|
||||||
229, 230, 231, 231, 232, 233, 234, 234, 235, 236, //
|
|
||||||
237, 238, 238, 239, 240, 241, 242, 242, 243, 244, //
|
|
||||||
245, 246, 246, 247, 248, 249, 250, 251, 251, 252, //
|
|
||||||
253, 254, 255, 256, 257, 257, 258, 259, 260, 261, //
|
|
||||||
262, 263, 264, 264, 265, 266, 267, 268, 269, 270, // 400 to 409
|
|
||||||
271, 272, 273, 273, 274, 275, 276, 277, 278, 279, //
|
|
||||||
280, 281, 282, 283, 284, 285, 286, 287, 288, 288, //
|
|
||||||
289, 290, 291, 292, 293, 294, 295, 296, 297, 298, //
|
|
||||||
299, 300, 301, 302, 303, 304, 305, 306, 307, 308, //
|
|
||||||
310, 311, 312, 313, 314, 315, 316, 317, 318, 319, //
|
|
||||||
320, 321, 322, 323, 324, 325, 327, 328, 329, 330, //
|
|
||||||
331, 332, 333, 334, 335, 337, 338, 339, 340, 341, //
|
|
||||||
342, 343, 345, 346, 347, 348, 349, 350, 352, 353, //
|
|
||||||
354, 355, 356, 357, 359, 360, 361, 362, 363, 365, //
|
|
||||||
366, 367, 368, 370, 371, 372, 373, 375, 376, 377, // 500 to 509
|
|
||||||
378, 380, 381, 382, 383, 385, 386, 387, 389, 390, //
|
|
||||||
391, 393, 394, 395, 397, 398, 399, 401, 402, 403, //
|
|
||||||
405, 406, 407, 409, 410, 411, 413, 414, 416, 417, //
|
|
||||||
418, 420, 421, 423, 424, 425, 427, 428, 430, 431, //
|
|
||||||
433, 434, 436, 437, 438, 440, 441, 443, 444, 446, //
|
|
||||||
447, 449, 450, 452, 453, 455, 456, 458, 460, 461, //
|
|
||||||
463, 464, 466, 467, 469, 470, 472, 474, 475, 477, //
|
|
||||||
478, 480, 482, 483, 485, 486, 488, 490, 491, 493, //
|
|
||||||
495, 496, 498, 500, 501, 503, 505, 506, 508, 510, //
|
|
||||||
511, 513, 515, 517, 518, 520, 522, 524, 525, 527, // 600 to 609
|
|
||||||
529, 531, 532, 534, 536, 538, 540, 541, 543, 545, //
|
|
||||||
547, 549, 551, 552, 554, 556, 558, 560, 562, 564, //
|
|
||||||
566, 567, 569, 571, 573, 575, 577, 579, 581, 583, //
|
|
||||||
585, 587, 589, 591, 593, 595, 597, 599, 601, 603, //
|
|
||||||
605, 607, 609, 611, 613, 615, 617, 619, 621, 623, //
|
|
||||||
625, 627, 630, 632, 634, 636, 638, 640, 642, 644, //
|
|
||||||
647, 649, 651, 653, 655, 658, 660, 662, 664, 666, //
|
|
||||||
669, 671, 673, 675, 678, 680, 682, 685, 687, 689, //
|
|
||||||
691, 694, 696, 698, 701, 703, 705, 708, 710, 713, //
|
|
||||||
715, 717, 720, 722, 725, 727, 729, 732, 734, 737, // 700 to 709
|
|
||||||
739, 742, 744, 747, 749, 752, 754, 757, 759, 762, //
|
|
||||||
764, 767, 770, 772, 775, 777, 780, 783, 785, 788, //
|
|
||||||
791, 793, 796, 799, 801, 804, 807, 809, 812, 815, //
|
|
||||||
817, 820, 823, 826, 828, 831, 834, 837, 840, 842, //
|
|
||||||
845, 848, 851, 854, 857, 860, 862, 865, 868, 871, //
|
|
||||||
874, 877, 880, 883, 886, 889, 892, 895, 898, 901, //
|
|
||||||
904, 907, 910, 913, 916, 919, 922, 925, 928, 932, //
|
|
||||||
935, 938, 941, 944, 947, 950, 954, 957, 960, 963, //
|
|
||||||
966, 970, 973, 976, 979, 983, 986, 989, 993, 996, //
|
|
||||||
999,1003,1006,1009,1013,1016,1020,1023,1027,1030, // 800 to 809
|
|
||||||
1033,1037,1040,1044,1047,1051,1054,1058,1061,1065, //
|
|
||||||
1069,1072,1076,1079,1083,1087,1090,1094,1098,1101, //
|
|
||||||
1105,1109,1112,1116,1120,1124,1127,1131,1135,1139, //
|
|
||||||
1143,1146,1150,1154,1158,1162,1166,1170,1174,1178, //
|
|
||||||
1182,1186,1189,1193,1197,1201,1206,1210,1214,1218, //
|
|
||||||
1222,1226,1230,1234,1238,1242,1247,1251,1255,1259, //
|
|
||||||
1263,1268,1272,1276,1280,1285,1289,1293,1298,1302, //
|
|
||||||
1306,1311,1315,1320,1324,1328,1333,1337,1342,1346, //
|
|
||||||
1351,1355,1360,1365,1369,1374,1378,1383,1388,1392, //
|
|
||||||
1397,1402,1406,1411,1416,1421,1425,1430,1435,1440, // 900 to 909
|
|
||||||
1444,1449,1454,1459,1464,1469,1474,1479,1484,1489, //
|
|
||||||
1494,1499,1504,1509,1514,1519,1524,1529,1534,1539, //
|
|
||||||
1545,1550,1555,1560,1565,1571,1576,1581,1587,1592, //
|
|
||||||
1597,1603,1608,1613,1619,1624,1630,1635,1641,1646, //
|
|
||||||
1652,1657,1663,1668,1674,1679,1685,1691,1696,1702, //
|
|
||||||
1708,1714,1719,1725,1731,1737,1742,1748,1754,1760, //
|
|
||||||
1766,1772,1778,1784,1790,1796,1802,1808,1814,1820, //
|
|
||||||
1826,1832,1838,1845,1851,1857,1863,1869,1876,1882, //
|
|
||||||
1888,1895,1901,1907,1914,1920,1927,1933,1940,1946, //
|
|
||||||
1953,1959,1966,1972,1979,1986,1992,1999,2006,2012, // 1000 to 1009
|
|
||||||
2019,2026,2033,2040,2046,2053,2060,2067,2074,2081, // 1010 to 1019
|
|
||||||
2088,2095,2102,2109 , // 1020 to 1023
|
|
||||||
};
|
|
||||||
|
|
||||||
uint16_t mapFreq(uint16_t input)
|
|
||||||
{
|
|
||||||
return pgm_read_word_near(freqTable + input);
|
|
||||||
}
|
|
||||||
|
|
||||||
//sets up pins and configures the samplerate and frequency of the PWM output
|
|
||||||
void setup()
|
|
||||||
{
|
|
||||||
TCCR2A = _BV(COM2A1) | _BV(WGM20);
|
|
||||||
TCCR2B = _BV(CS20);
|
|
||||||
TIMSK2 = _BV(TOIE2);
|
|
||||||
pinMode(PWM_PIN,OUTPUT);
|
|
||||||
PWM_VALUE = 127;
|
|
||||||
}
|
|
||||||
|
|
||||||
//reads modulation inputs
|
|
||||||
void loop()
|
|
||||||
{
|
|
||||||
//calculate the pitch
|
|
||||||
int pwmv = min( 1023, analogRead(PITCH_CV) + analogRead(PITCH_KNOB));
|
|
||||||
//look up the phase increase per sample
|
|
||||||
phase_inc = mapFreq(pwmv);
|
|
||||||
//read the control for wave-folding
|
|
||||||
wrap = min( 64 + (analogRead(WRAP_CONTROL) >> 1), 511);
|
|
||||||
//read the control for clipping and calculate the two amounts of overdrive
|
|
||||||
drive = min( 32 + (analogRead(DRIVE_CONTROL) >> 1), 511);
|
|
||||||
top_drive = max( 32, drive >>1);
|
|
||||||
}
|
|
||||||
|
|
||||||
//Actual sound generation happens here.
|
|
||||||
//This involves rather a lot of bitwise operations, if you're looking to get
|
|
||||||
//into writing code for the Grains I'd suggest not starting here; "PWM-Saw" is
|
|
||||||
//far more "friendly". That's a nice way of saying "Here be Dragons".
|
|
||||||
//I'm writing numbers out as literal trains of 0's and 1's because we make fair
|
|
||||||
//ampount of use of those. Also note that a lot of the structure for this is
|
|
||||||
//caused by avoiding signed integers, while we do want a symetrical signal.
|
|
||||||
//Hence; we treat it as a unipolar signal, keep track of the polarity it should
|
|
||||||
//be and apply that at the end.
|
|
||||||
//I drew the process out on graph paper using multicoloured fineliner.
|
|
||||||
//If you're serious about following all of this that might help.
|
|
||||||
SIGNAL(PWM_INTERRUPT)
|
|
||||||
{
|
|
||||||
//increase the phase
|
|
||||||
phase_accumulator += phase_inc;
|
|
||||||
//2nd half of the phase will be the negative part of the cycle
|
|
||||||
flip = phase_accumulator & 0b1000000000000000;
|
|
||||||
//turn the phase acumulator into 4 up-ramps
|
|
||||||
output = (phase_accumulator & 0b0011111111111111);
|
|
||||||
//get these into 7 bit range. "flip" will be the 8th bit of the output
|
|
||||||
output = output >> 7;
|
|
||||||
//invert the 2nd and 4th of our 4 up-ramps to create our triangle wave
|
|
||||||
if (phase_accumulator & 0b0100000000000000) output = (uint16_t)127 - output;
|
|
||||||
|
|
||||||
//amplify the signal for the wave-wrapping
|
|
||||||
output *= wrap;
|
|
||||||
output = output >> 6;
|
|
||||||
//detect whether folding will be more involved than inverting the range
|
|
||||||
//from 128 to 254
|
|
||||||
if (output & 0b1111111100000000)
|
|
||||||
{
|
|
||||||
//values between 255 and 511 fold back past the "0" line
|
|
||||||
if (output & 0b0000000100000000) flip = !flip;
|
|
||||||
//mask out bits beyond which the process just repeats
|
|
||||||
output &= 0b0000000011111111;
|
|
||||||
}
|
|
||||||
//actual folding
|
|
||||||
if (output > (uint16_t)127)
|
|
||||||
{
|
|
||||||
output = 127 - (output & 0b0000000001111111);
|
|
||||||
}
|
|
||||||
|
|
||||||
//apply the signal gain for asymetrical clipping
|
|
||||||
output *= flip?drive:top_drive;
|
|
||||||
output = output >> 5;
|
|
||||||
//clip
|
|
||||||
if (output > (uint16_t)127) output = (uint16_t)127;
|
|
||||||
|
|
||||||
//turn our 7bit unipolar value into a 8bit bipolar one
|
|
||||||
if ( flip ) output = (uint16_t)127 - output;
|
|
||||||
else output += (uint16_t)127;
|
|
||||||
|
|
||||||
//slight amount of smoothing
|
|
||||||
output = (output + last_out) >> 1;
|
|
||||||
last_out = output;
|
|
||||||
|
|
||||||
//write out the output
|
|
||||||
PWM_VALUE = output;
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue