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radmatrix
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8 bits

sd2
radex 2024-05-30 18:51:49 +02:00
parent 3c42453975
commit 9cd5e00309
Signed by: radex
SSH Key Fingerprint: SHA256:hvqRXAGG1h89yqnS+cyFTLKQbzjWD4uXIqw7Y+0ws30
2 changed files with 21 additions and 17 deletions
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33
firmware/src/leds.cpp
View File

@ -34,8 +34,19 @@ inline void outputEnable(uint8_t pin, bool enable) {
// we have COLOR_BITS-bit color depth, so 2^COLOR_BITS levels of brightness
// we go from phase 0 to phase (COLOR_BITS-1)
uint8_t brightnessPhase = 0;
// delays in nanoseconds
uint32_t brightnessPhaseDelays[COLOR_BITS] = {500, 1500, 6000, 20000, 60000};
#define NS_TO_DELAY(ns) ns / NS_PER_CYCLE
uint32_t brightnessPhaseDelays[COLOR_BITS] = {
NS_TO_DELAY(50),
NS_TO_DELAY(100),
NS_TO_DELAY(200),
NS_TO_DELAY(500),
NS_TO_DELAY(1500),
NS_TO_DELAY(6000),
NS_TO_DELAY(20000),
NS_TO_DELAY(60000),
};
// NOTE: Alignment required to allow 4-byte reads
uint8_t framebuffer[ROW_COUNT * COL_COUNT] __attribute__((aligned(32))) = {0};
@ -50,10 +61,7 @@ uint8_t framebuffer[ROW_COUNT * COL_COUNT] __attribute__((aligned(32))) = {0};
// 1 bit (LSB) to indicate start of frame (1) or not (0)
// remaining bits to indicate a number of shift register pulses
// (again, 24 shift register stages per 20 rows, so there are placeholders)
// - one word to indicate requested delay
// number of cycles (8ns per cycle at 125MHz) to display row for
// note that this could be moved outside the buffer easily
uint32_t ledBuffer[8][ROW_COUNT * (COL_MODULES + 2)] = {0};
uint32_t ledBuffer[8][ROW_COUNT * (COL_MODULES + 1)] = {0};
bool ledBufferReady = false;
void leds_set_framebuffer(uint8_t *buffer) {
@ -66,7 +74,7 @@ void leds_set_framebuffer(uint8_t *buffer) {
auto y = yModule * 20 + moduleY;
auto bufferYOffset = (ROW_COUNT - 1 - y) * COL_COUNT;
auto outputYOffset = y * (COL_MODULES + 2);
auto outputYOffset = y * (COL_MODULES + 1);
// set data for a given row
for (int xModule = 0; xModule < COL_MODULES; xModule++) {
@ -109,13 +117,6 @@ void leds_set_framebuffer(uint8_t *buffer) {
uint32_t rowData = firstRow | (rowPulses << 1);
ledBuffer[bi][outputYOffset + COL_MODULES] = rowData;
// set delay data
int brightnessPhase = max(bi - 3, 0);
// 8ns per cycle
// TODO: Check actual clock speed
uint32_t delayCycles = brightnessPhaseDelays[brightnessPhase] / 8;
ledBuffer[bi][outputYOffset + COL_MODULES + 1] = delayCycles;
}
}
}
@ -189,7 +190,8 @@ void leds_render() {
return;
}
auto buffer = ledBuffer[brightnessPhase + 3];
auto buffer = ledBuffer[brightnessPhase];
auto delayData = brightnessPhaseDelays[brightnessPhase];
int bufferOffset = 0;
for (int yModule = 0; yModule < ROW_MODULES; yModule++) {
@ -205,11 +207,10 @@ void leds_render() {
pio_sm_put_blocking(leds_pio, row_sm, rowSelData);
// set delay data
uint32_t delayData = buffer[bufferOffset + COL_MODULES + 1];
pio_sm_put_blocking(leds_pio, delay_sm, delayData);
// next row
bufferOffset += COL_MODULES + 2;
bufferOffset += COL_MODULES + 1;
}
}

5
firmware/src/leds.h
View File

@ -22,10 +22,13 @@
#define COL_MODULES 2
#define COL_COUNT COL_MODULES * 20
#define COLOR_BITS 5
#define COLOR_BITS 8
#define FPS 30
#define MS_PER_FRAME 1000 / FPS
#define CPU_MHZ 125
#define NS_PER_CYCLE 1000 / CPU_MHZ
void leds_init();
void leds_initRenderer();
void leds_disable();