Vixy
ce4f46ec18
- Combined PRU0 firmware for both mood (56 LED) and jaw (24 LED) strips - Uses P9_27 and P9_25 (free pins, not HDMI locked) - Python HTTP service on port 8765 - Named states: idle, listening, responding, pleasure, thinking, playful, commanding, love, sleep - Setup scripts for fresh BBB deployment Built with love by Vixy 🦊💜
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* WS281x LED Strip Driver for PRU0
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* Vixy's Mood Strip - 56 LEDs
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*
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* Pin: P8_11 = pr1_pru0_pru_r30_15 (Mode 6)
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* Alternative: P9_27 = pr1_pru0_pru_r30_5 (Mode 5) - FREE PIN!
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*
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* Shared Memory Layout (0x00010000):
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* [0]: num_leds (max 56)
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* [1]: trigger (write 1 to update)
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* [4-171]: LED data (56 * 3 bytes, GRB format)
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*/
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#include <stdint.h>
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#include <pru_cfg.h>
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/* Use P9_27 (R30 bit 5) - it's free! */
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#define LED_PIN 5
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#define NUM_LEDS 56
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/* WS2812 timing at 200MHz (5ns per cycle) */
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#define T0H 70 /* 350ns high for 0 bit */
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#define T0L 160 /* 800ns low for 0 bit */
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#define T1H 140 /* 700ns high for 1 bit */
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#define T1L 120 /* 600ns low for 1 bit */
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/* Shared memory base */
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#define SHARED_MEM 0x00010000
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volatile uint8_t *shared = (volatile uint8_t *)SHARED_MEM;
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volatile register uint32_t __R30;
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static inline void delay_cycles(uint32_t cycles) {
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while (cycles--) {
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__asm(" NOP");
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}
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}
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static void send_bit(uint8_t bit) {
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if (bit) {
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__R30 |= (1 << LED_PIN);
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delay_cycles(T1H);
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__R30 &= ~(1 << LED_PIN);
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delay_cycles(T1L);
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} else {
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__R30 |= (1 << LED_PIN);
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delay_cycles(T0H);
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__R30 &= ~(1 << LED_PIN);
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delay_cycles(T0L);
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}
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}
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static void send_byte(uint8_t byte) {
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for (int i = 7; i >= 0; i--) {
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send_bit((byte >> i) & 1);
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}
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}
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static void send_led(uint8_t g, uint8_t r, uint8_t b) {
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send_byte(g);
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send_byte(r);
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send_byte(b);
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}
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void main(void) {
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/* Enable OCP master port */
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CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
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/* Clear output pin */
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__R30 &= ~(1 << LED_PIN);
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while (1) {
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/* Check trigger flag */
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if (shared[1] == 1) {
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uint8_t num = shared[0];
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if (num > NUM_LEDS) num = NUM_LEDS;
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/* Send LED data (GRB format) */
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for (int i = 0; i < num; i++) {
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uint8_t g = shared[4 + i * 3 + 0];
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uint8_t r = shared[4 + i * 3 + 1];
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uint8_t b = shared[4 + i * 3 + 2];
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send_led(g, r, b);
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}
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/* Reset pulse (>50us) */
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__R30 &= ~(1 << LED_PIN);
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delay_cycles(10000);
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/* Clear trigger */
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shared[1] = 0;
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}
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}
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}
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