Changes

device_server.py

@@ -24,6 +24,12 @@ REGISTER_COMMANDS = [
     "memtool md -l 0x32e100b4+0x0c",   # DSIM_PHYTIMING / PHYTIMING1 / PHYTIMING2
 ]
 
+# ---------------------------------------------------------------------------
+# SN65DSI83 I2C configuration
+# ---------------------------------------------------------------------------
+SN65_I2C_BUS  = 2      # i2c-2 on i.MX 8M Mini — change if bridge is on a different bus
+SN65_I2C_ADDR = 0x2C   # SN65DSI83 fixed 7-bit I2C address
+
 # Known Samsung DSIM register names (base 0x32E10000, i.MX 8M Mini)
 _DSIM_NAMES = {
     0x32e10004: "DSIM_STATUS",
@@ -118,5 +124,58 @@ def get_registers():
     }), 200
 
 
+def _i2c_read_byte(bus: int, addr: int, reg: int) -> int | None:
+    """Read one byte from an I2C device using i2cget. Returns None on failure."""
+    try:
+        result = subprocess.run(
+            ["i2cget", "-y", str(bus), f"0x{addr:02x}", f"0x{reg:02x}"],
+            capture_output=True, text=True, timeout=3
+        )
+        if result.returncode == 0:
+            return int(result.stdout.strip(), 16)
+    except Exception:
+        pass
+    return None
+
+
+@app.route("/sn65_registers", methods=["GET"])
+def get_sn65_registers():
+    """Read SN65DSI83 CSR 0x0A (PLL/CLK status) and 0xE5 (error flags) via I2C."""
+    csr_0a = _i2c_read_byte(SN65_I2C_BUS, SN65_I2C_ADDR, 0x0A)
+    csr_e5 = _i2c_read_byte(SN65_I2C_BUS, SN65_I2C_ADDR, 0xE5)
+
+    regs   = {}
+    errors = []
+
+    if csr_0a is not None:
+        regs["csr_0a"] = {
+            "value":    f"0x{csr_0a:02x}",
+            "pll_lock": bool(csr_0a & 0x80),   # bit 7: PLL_EN_STAT (powered + locked)
+            "clk_det":  bool(csr_0a & 0x40),   # bit 6: high-speed CLK lane detected
+        }
+    else:
+        errors.append("CSR 0x0A: i2cget failed")
+
+    if csr_e5 is not None:
+        regs["csr_e5"] = {
+            "value":           f"0x{csr_e5:02x}",
+            "pll_unlock":      bool(csr_e5 & 0x01),  # default=1 at reset; must clear after init
+            "cha_sot_bit_err": bool(csr_e5 & 0x04),
+            "cha_llp_err":     bool(csr_e5 & 0x08),  # SoT/EoT/lane-merge error
+            "cha_ecc_err":     bool(csr_e5 & 0x10),
+            "cha_lp_err":      bool(csr_e5 & 0x20),
+            "cha_crc_err":     bool(csr_e5 & 0x40),
+        }
+    else:
+        errors.append("CSR 0xE5: i2cget failed")
+
+    return jsonify({
+        "i2c_bus":   SN65_I2C_BUS,
+        "i2c_addr":  f"0x{SN65_I2C_ADDR:02x}",
+        "registers": regs,
+        "errors":    errors if errors else None,
+    }), 200
+
+
 if __name__ == "__main__":
     app.run(host="0.0.0.0", port=5000)