Make bidirectional communication work between the keyboard halves. Make the set test LED USB command set the test LED of the left half, too.

left/src/bridge_protocol_handler.c

@@ -0,0 +1,40 @@
+#include "bridge_protocol_handler.h"
+#include "test_led.h"
+#include "main.h"
+#include "i2c_addresses.h"
+#include "i2c.h"
+
+void SetError(uint8_t error);
+void SetGenericError();
+void SetResponseByte(uint8_t response);
+
+void SetError(uint8_t error) {
+    BridgeTxBuffer[0] = error;
+}
+
+void SetGenericError()
+{
+    SetError(PROTOCOL_RESPONSE_GENERIC_ERROR);
+}
+
+// Set a single byte as the response.
+void SetResponseByte(uint8_t response)
+{
+    BridgeTxBuffer[1] = response;
+}
+
+void BridgeProtocolHandler()
+{
+    uint8_t commandId = BridgeRxBuffer[0];
+    switch (commandId) {
+        case BRIDGE_COMMAND_GET_KEY_STATES:
+            BridgeTxSize = KEYBOARD_MATRIX_COLS_NUM*KEYBOARD_MATRIX_ROWS_NUM;
+            memcpy(BridgeTxBuffer, keyMatrix.keyStates, BridgeTxSize);
+            break;
+        case BRIDGE_COMMAND_SET_LED:
+            TEST_LED_OFF();
+            BridgeTxSize = 0;
+            TEST_LED_SET(BridgeRxBuffer[1]);
+            break;
+        }
+}