adafruit-mirror/Adafruit_Blinka_Raspberry_Pi5_Piomatter
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

WIP

Browse source
This commit is contained in:
Jeff Epler 2024-12-12 20:02:08 -06:00
parent 3ea618d155
commit 48e729d76c
2 changed files with 63 additions and 46 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

101
protodemo.c
View file

@ -1,3 +1,4 @@
#include <cmath>
#include <cstdlib> #include <cstdlib>
#include <stdio.h> #include <stdio.h>
#include <stdbool.h> #include <stdbool.h>
@ -38,7 +39,7 @@ const uint8_t all_pins[] = {
PIN_CLK, PIN_CLK,
PIN_LAT, PIN_LAT,
}; };
#define DATA_OVERHEAD (6) #define DATA_OVERHEAD (5)
#define DELAY_OVERHEAD (4) #define DELAY_OVERHEAD (4)
#define CLOCKS_PER_DELAY (1) #define CLOCKS_PER_DELAY (1)
// so for example a DATA word with a delay of 3 will take DATA_OVERHEAD+3*CLOCKS_PER_DELAY // so for example a DATA word with a delay of 3 will take DATA_OVERHEAD+3*CLOCKS_PER_DELAY
@ -81,7 +82,7 @@ static inline void protomatter_program_init(PIO pio, int sm, uint offset) {
#define y (r|g) #define y (r|g)
#define c (g|b) #define c (g|b)
#define m (r|b) #define m (r|b)
#define w (7) #define w (r|g|b)
uint32_t pixels[][ACROSS] = { uint32_t pixels[][ACROSS] = {
{_,w,_,_,r,r,_,_,_,g,_,_,b,b,b,_,c,c,_,_,y,_,y,_,m,m,m,_,w,w,w,_}, // 0 {_,w,_,_,r,r,_,_,_,g,_,_,b,b,b,_,c,c,_,_,y,_,y,_,m,m,m,_,w,w,w,_}, // 0
@ -121,15 +122,19 @@ constexpr uint32_t oe_bit = 1u << PIN_OE;
constexpr uint32_t oe_active = 0; constexpr uint32_t oe_active = 0;
constexpr uint32_t oe_inactive = oe_bit; constexpr uint32_t oe_inactive = oe_bit;
constexpr uint32_t pre_latch_delay = 10; constexpr uint32_t post_oe_delay = 10;
constexpr uint32_t post_latch_delay = 17; constexpr uint32_t post_latch_delay = 17;
constexpr uint32_t post_oe_delay = 20; constexpr uint32_t post_addr_delay = 20;
uint32_t rgb(int r, int g, int b) { uint32_t rgb(unsigned r, unsigned g, unsigned b) {
assert(r < 256);
assert(g < 256);
assert(b < 256);
return (r << 16) | (g << 8) | b; return (r << 16) | (g << 8) | b;
} }
uint32_t colorwheel(int i) { uint32_t colorwheel(int i) {
i = i & 0xff;
if(i < 85) { if(i < 85) {
return rgb(255 - i * 3, 0, i * 3); return rgb(255 - i * 3, 0, i * 3);
} }
@ -141,15 +146,18 @@ uint32_t colorwheel(int i) {
return rgb(i * 3, 255 - i * 3, 0); return rgb(i * 3, 255 - i * 3, 0);
} }
std::vector<uint32_t> test_pattern() { std::vector<uint32_t> test_pattern(int offs, int brightness) {
std::vector<uint32_t> result; std::vector<uint32_t> result;
uint32_t time=0; uint32_t time=0;
for(int i=0; i<ACROSS; i++) { for(int i=0; i<ACROSS; i++) {
pixels[12][i] = colorwheel(2*i); pixels[11][i] = rgb(i*8, i*8, i*8);
pixels[13][i] = colorwheel(2*i+64); //int j = 255 - i * 8;
pixels[14][i] = colorwheel(2*i+128); //pixels[ 5][i] = rgb(j, j, j);
pixels[15][i] = colorwheel(2*i+192); pixels[12][i] = colorwheel(2*i + offs);
pixels[13][i] = colorwheel(2*i+64 + offs);
pixels[14][i] = colorwheel(2*i+128 + offs);
pixels[15][i] = colorwheel(2*i+192 + offs);
} }
auto do_delay = [&](uint32_t delay) { auto do_delay = [&](uint32_t delay) {
@ -179,8 +187,8 @@ std::vector<uint32_t> test_pattern() {
return data; return data;
}; };
auto add_data_word = [&](uint32_t addr_bits, bool r0, bool g0, bool b0, bool r1, bool g1, bool b1) { auto add_pixels = [&](uint32_t addr_bits, bool r0, bool g0, bool b0, bool r1, bool g1, bool b1, bool active) {
uint32_t data = oe_active | addr_bits; uint32_t data = (active ? oe_active : oe_inactive) | addr_bits;
if(r0) data |= (1 << PIN_R0); if(r0) data |= (1 << PIN_R0);
if(g0) data |= (1 << PIN_G0); if(g0) data |= (1 << PIN_G0);
if(b0) data |= (1 << PIN_B0); if(b0) data |= (1 << PIN_B0);
@ -189,20 +197,27 @@ std::vector<uint32_t> test_pattern() {
if(b1) data |= (1 << PIN_B1); if(b1) data |= (1 << PIN_B1);
do_data(data, data_delay); do_data(data, data_delay);
do_data(data | clk_bit, data_delay); do_data(data | clk_bit, clock_delay);
}; };
uint32_t base_active_time = ACROSS * (2 * DATA_OVERHEAD + data_delay + clock_delay);
int last_bit = 0;
int prev_addr = 7;
for(int bit = 7; bit >= 0; bit--) { for(int bit = 7; bit >= 0; bit--) {
int last_bit = (bit + 1) % 8;
uint32_t desired_duration = 400 << last_bit; // mumble
uint32_t r = 1 << (16 + bit); uint32_t r = 1 << (16 + bit);
uint32_t g = 1 << (8 + bit); uint32_t g = 1 << (8 + bit);
uint32_t b = 1 << bit; uint32_t b = 1 << bit;
for(int addr = 0; addr < 8; addr++) { for(int addr = 0; addr < 8; addr++) {
uint32_t desired_duration = base_active_time << last_bit;
last_bit = bit;
uint32_t t_start = time; uint32_t t_start = time;
uint32_t addr_bits = calc_addr_bits((addr + 7) % 8); // address of previous line
// illuminate the right row for data in the shift register (the previous address)
uint32_t addr_bits = calc_addr_bits(prev_addr);
prev_addr = addr;
for(int across = 0; across < ACROSS; across++) { for(int across = 0; across < ACROSS; across++) {
auto pixel0 = pixels[addr][across]; auto pixel0 = pixels[addr][across];
@ -214,26 +229,26 @@ std::vector<uint32_t> test_pattern() {
auto g1 = pixel1 & g; auto g1 = pixel1 & g;
auto b1 = pixel1 & b; auto b1 = pixel1 & b;
add_data_word(addr_bits, r0, g0, b0, r1, g1, b1); add_pixels(addr_bits, r0, g0, b0, r1, g1, b1, across < brightness);
} }
uint32_t t_end = time; uint32_t t_end = time;
uint32_t duration = t_end - t_start; uint32_t duration = t_end - t_start;
printf("line duration %d\n", duration); // hold /OE low until desired time has elapsed to illuminate the LAST line
// hold /OE low until desired time has elapsed
if (duration < desired_duration) { if (duration < desired_duration) {
printf("additional duration %d\n", desired_duration - duration);
do_delay(desired_duration - duration); do_delay(desired_duration - duration);
} }
do_data(addr_bits | oe_inactive, pre_latch_delay);
do_data(addr_bits | oe_inactive | lat_bit, post_latch_delay);
addr_bits = calc_addr_bits(addr);
do_data(addr_bits | oe_inactive, post_oe_delay); do_data(addr_bits | oe_inactive, post_oe_delay);
do_data(addr_bits | oe_inactive | lat_bit, post_latch_delay);
// with oe inactive, set address bits to illuminate THIS line
//addr_bits = calc_addr_bits(addr);
do_data(addr_bits | oe_inactive, post_addr_delay);
} }
} }
printf("Time %d (%.1f us)\n", time, time*1e6/clock_get_hz(clk_sys)); //printf("Time %d (%.1f us)\n", time, time*1e6/clock_get_hz(clk_sys));
return result; return result;
} }
@ -241,7 +256,6 @@ std::vector<uint32_t> test_pattern() {
int main(int argc, char **argv) { int main(int argc, char **argv) {
PIO pio = pio0; PIO pio = pio0;
int sm = pio_claim_unused_sm(pio, true); int sm = pio_claim_unused_sm(pio, true);
pio_sm_config_xfer(pio, sm, PIO_DIR_TO_SM, 256, 1);
printf("clock %fMHz\n", clock_get_hz(clk_sys)/1e6); printf("clock %fMHz\n", clock_get_hz(clk_sys)/1e6);
@ -252,25 +266,28 @@ printf("clock %fMHz\n", clock_get_hz(clk_sys)/1e6);
pio_sm_set_clkdiv(pio, sm, 1.0); pio_sm_set_clkdiv(pio, sm, 1.0);
protomatter_program_init(pio, sm, offset); protomatter_program_init(pio, sm, offset);
pio_sm_set_clkdiv(pio, sm, 1.0);
std::vector<uint32_t> data = test_pattern(); std::vector<uint32_t> data = test_pattern(0, 0);
FILE *f = fopen("pattern.txt", "w");
for(auto i: data) { fprintf(f, "0x%08x, ", i); }
fclose(f);
int n = argc > 1 ? atoi(argv[1]) : 1;
std::vector<uint32_t> dc;
int rep = 0;
while(dc.size() + data.size() < UINT16_MAX / sizeof(uint32_t)) {
rep ++;
std::copy(data.begin(), data.end(), std::back_inserter(dc));
}
std::swap(dc, data);
uint32_t *databuf = &data[0];
size_t datasize = data.size() * sizeof(uint32_t);
assert(datasize < 65536);
printf("%zd data elements (%d repetitions)\n", data.size(), rep);
int n = argc > 1 ? atoi(argv[1]) : 1;
for(int i=0; i<n; i++) { for(int i=0; i<n; i++) {
pio_sm_xfer_data(pio, sm, PIO_DIR_TO_SM, datasize, databuf); float f = (1 + sin(i / 100.)) / 2;
int b = int(f * 32);
printf("%d\n", b);
std::vector<uint32_t> data = test_pattern(i, b);
uint32_t *databuf = &data[0];
size_t datasize = data.size() * sizeof(uint32_t);
assert(datasize < 65536);
if (i == 0) { printf("%zd data elements\n", data.size()); }
if(i == 0)
pio_sm_config_xfer(pio, sm, PIO_DIR_TO_SM, datasize, 1);
pio_sm_xfer_data(pio, sm, PIO_DIR_TO_SM, datasize, databuf);
} }
} }

8
protomatter.pio
View file

@ -10,14 +10,14 @@ top:
jmp !x do_delay jmp !x do_delay
out x, 3 out x, 3
out pins, 28 out pins, 28
jmp delay_loop
do_delay:
out x, 31
delay_loop: delay_loop:
jmp x--, delay_loop jmp x--, delay_loop
.wrap .wrap
do_delay:
out x, 31
jmp delay_loop
;; fill program out to 32 instructions so nothing else can load ;; fill program out to 32 instructions so nothing else can load
nop nop
nop nop