feat(extio): Add EXTIO command data structures

Reverse engineered from a real EXTIO device, open-io project as further reference
2023-06-25 13:24:07 +02:00
parent c22ec4fcff
commit 2bbbfccd13
3 changed files with 69 additions and 0 deletions
@@ -0,0 +1,49 @@
+#ifndef EXTIO_CMD_H
+#define EXTIO_CMD_H
+
+#include <stdint.h>
+
+#define EXTIO_PAD_LIGHT_MAX_PLAYERS 2
+
+enum extio_status {
+    EXTIO_STATUS_OK = 0x11,
+};
+
+#pragma pack(push, 1)
+
+struct extio_cmd_pad_light {
+    uint8_t unknown : 3;
+    uint8_t right : 1;
+    uint8_t left : 1;
+    uint8_t down : 1;
+    uint8_t up : 1;
+    uint8_t unknown_80 : 1;
+};
+
+struct extio_cmd_write {
+    struct extio_cmd_pad_light pad_lights[EXTIO_PAD_LIGHT_MAX_PLAYERS];
+
+    uint8_t unknown3 : 3;
+    uint8_t sensor_read_mode : 3;
+    uint8_t neons : 1;
+    uint8_t unknown4 : 1;
+
+    uint8_t checksum;
+};
+
+struct extio_cmd_read {
+    uint8_t status;
+};
+
+_Static_assert(
+    sizeof(struct extio_cmd_write) == 4,
+    "struct extio_cmd_write is the wrong size");
+_Static_assert(
+    sizeof(struct extio_cmd_read) == 1,
+    "struct extio_cmd_read is the wrong size");
+
+#pragma pack(pop)
+
+uint8_t extio_cmd_checksum(const struct extio_cmd_write *write);
+
+#endif