Drashna's split updates (#13350)

Co-authored-by: Ryan <fauxpark@gmail.com>

users/drashna/transport_sync.c

@@ -0,0 +1,80 @@
+#ifdef SPLIT_TRANSACTION_IDS_USER
+#include "transport_sync.h"
+#include "transactions.h"
+#include <string.h>
+
+typedef struct {
+    bool            oled_on;
+    uint16_t keymap_config;
+} user_runtime_config_t;
+
+user_runtime_config_t user_state;
+
+void user_sync(uint8_t initiator2target_buffer_size, const void* initiator2target_buffer, uint8_t target2initiator_buffer_size, void* target2initiator_buffer) {
+    if (initiator2target_buffer_size == sizeof(user_state)) {
+        memcpy(&user_state, initiator2target_buffer, initiator2target_buffer_size);
+    }
+}
+
+void keyboard_post_init_transport_sync(void) {
+    // Register keyboard state sync split transaction
+    transaction_register_rpc(RPC_ID_USER_STATE_SYNC, user_sync);
+}
+
+void user_state_update(void) {
+    if (is_keyboard_master()) {
+
+#ifdef OLED_DRIVER_ENABLE
+        user_state.oled_on = is_oled_on();
+#endif
+
+        user_state.keymap_config = keymap_config.raw;
+    } else {
+#ifdef OLED_DRIVER_ENABLE
+        if (user_state.oled_on) {
+            oled_on();
+        } else {
+            oled_off();
+        }
+#endif
+        if (keymap_config.raw != user_state.keymap_config) {
+            keymap_config.raw = user_state.keymap_config;
+        }
+    }
+}
+
+void user_state_sync(void) {
+    if (is_keyboard_master()) {
+        // Keep track of the last state, so that we can tell if we need to propagate to slave
+        static user_runtime_config_t last_user_state;
+        static uint32_t              last_sync;
+        bool                         needs_sync = false;
+
+        // Check if the state values are different
+        if (memcmp(&user_state, &last_user_state, sizeof(user_state))) {
+            needs_sync = true;
+            memcpy(&last_user_state, &user_state, sizeof(user_state));
+        }
+
+        // Send to slave every 500ms regardless of state change
+        if (timer_elapsed32(last_sync) > 250) {
+            needs_sync = true;
+        }
+
+        // Perform the sync if requested
+        if (needs_sync) {
+            if (transaction_rpc_send(RPC_ID_USER_STATE_SYNC, sizeof(user_state), &user_state)) {
+                last_sync = timer_read32();
+            }
+        }
+    }
+}
+
+void housekeeping_task_user(void) {
+    // Update kb_state so we can send to slave
+    user_state_update();
+
+    // Data sync from master to slave
+    user_state_sync();
+}
+#endif