Initial commit: PRU LED firmware and HTTP service

- 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 🦊💜
2026-01-29 21:25:08 -06:00
commit ce4f46ec18
11 changed files with 714 additions and 0 deletions
--- a/pru/ws281x_pru1.c
+++ b/pru/ws281x_pru1.c
@@ -0,0 +1,80 @@
+/*
+ * WS281x LED Strip Driver for PRU1
+ * Vixy's Jaw LEDs - 24 LEDs (12 per side)
+ * 
+ * Original Pin: P8_45 = pr1_pru1_pru_r30_0 (Mode 5) - LOCKED BY HDMI
+ * Alternative: We use PRU0 with different memory offset instead
+ *              since all PRU1 pins are HDMI locked on this image
+ * 
+ * This firmware is kept for reference but we'll use a combined
+ * PRU0 firmware that handles both strips sequentially.
+ */
+
+#include <stdint.h>
+#include <pru_cfg.h>
+
+#define LED_PIN     0
+#define NUM_LEDS    24
+
+/* WS2812 timing at 200MHz */
+#define T0H     70
+#define T0L     160
+#define T1H     140
+#define T1L     120
+
+/* Shared memory offset for jaw data (after mood strip) */
+#define SHARED_MEM  0x00010100  /* 256 bytes after PRU0 data */
+
+volatile uint8_t *shared = (volatile uint8_t *)SHARED_MEM;
+volatile register uint32_t __R30;
+
+static inline void delay_cycles(uint32_t cycles) {
+    while (cycles--) {
+        __asm(" NOP");
+    }
+}
+
+static void send_bit(uint8_t bit) {
+    if (bit) {
+        __R30 |= (1 << LED_PIN);
+        delay_cycles(T1H);
+        __R30 &= ~(1 << LED_PIN);
+        delay_cycles(T1L);
+    } else {
+        __R30 |= (1 << LED_PIN);
+        delay_cycles(T0H);
+        __R30 &= ~(1 << LED_PIN);
+        delay_cycles(T0L);
+    }
+}
+
+static void send_byte(uint8_t byte) {
+    for (int i = 7; i >= 0; i--) {
+        send_bit((byte >> i) & 1);
+    }
+}
+
+void main(void) {
+    CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
+    __R30 &= ~(1 << LED_PIN);
+    
+    while (1) {
+        if (shared[1] == 1) {
+            uint8_t num = shared[0];
+            if (num > NUM_LEDS) num = NUM_LEDS;
+            
+            for (int i = 0; i < num; i++) {
+                uint8_t g = shared[4 + i * 3 + 0];
+                uint8_t r = shared[4 + i * 3 + 1];
+                uint8_t b = shared[4 + i * 3 + 2];
+                send_byte(g);
+                send_byte(r);
+                send_byte(b);
+            }
+            
+            __R30 &= ~(1 << LED_PIN);
+            delay_cycles(10000);
+            shared[1] = 0;
+        }
+    }
+}