center/fw: Add backchannel infrastructure

Untested!

1 files changed, 26 insertions, 0 deletions

diff --git a/center_fw/8seg_protocol.h b/center_fw/8seg_protocol.h
new file mode 100644
index 0000000..2da42c4
--- /dev/null
+++ b/center_fw/8seg_protocol.h
@@ -0,0 +1,26 @@
+#ifndef __8SEG_PROTOCOL_H__
+#define __8SEG_PROTOCOL_H__
+
+enum packet_type {
+    PKT_TYPE_RESERVED = 0,
+    PKT_TYPE_SET_OUTPUTS_BINARY = 1,
+    PKT_TYPE_SET_GLOBAL_BRIGHTNESS = 2,
+    PKT_TYPE_SET_OUTPUTS = 3,
+    PKT_TYPE_GET_STATUS = 4,
+    PKT_TYPE_MAX
+};
+
+struct status_tx {
+    int16_t temp_tenths_C;
+    uint32_t uptime_s;
+    uint32_t decoding_error_cnt, protocol_error_cnt;
+    int16_t vcc_mv, vin_mv, vskew_mv;
+    uint16_t jitter_meas_avg_ns;
+};
+
+extern void set_outputs(uint8_t val[8]);
+extern void set_outputs_binary(int mask, int global_brightness);
+
+void protocol_init(void);
+
+#endif /* __8SEG_PROTOCOL_H__ */