hardware: I2C level shifter.

hackamp/hardware/bluetooth.kicad_sch

@@ -614,6 +614,134 @@
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+  (junction (at 39.37 163.83) (diameter 0.9144) (color 0 0 0 0))
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@@ -874,6 +1080,12 @@
     (effects (font (size 1.27 1.27)) (justify right bottom))
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+    (effects (font (size 1.27 1.27)) (justify right bottom))
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+    (effects (font (size 1.27 1.27)) (justify right bottom))
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   (label "USB3_DP" (at 83.82 55.88 180)
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@@ -889,6 +1101,12 @@
   (label "WS_1.8V" (at 120.65 74.93 180)
     (effects (font (size 1.27 1.27)) (justify right bottom))
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   (label "SDI_1.8V" (at 133.35 76.2 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
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@@ -905,7 +1123,10 @@
     (effects (font (size 1.27 1.27)) (justify right bottom))
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+    (effects (font (size 1.27 1.27)) (justify right))
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   (hierarchical_label "SDO" (shape input) (at 81.28 83.82 180)
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   (hierarchical_label "SDI" (shape input) (at 95.25 40.64 180)
     (effects (font (size 1.27 1.27)) (justify right))
   )
@@ -957,6 +1175,66 @@
     (effects (font (size 1.27 1.27)) (justify right))
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+      (effects (font (size 1.27 1.27)) hide)
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+      (effects (font (size 1.27 1.27)) hide)
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+      (effects (font (size 1.27 1.27)) hide)
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+      (effects (font (size 1.27 1.27)) hide)
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     (in_bom yes) (on_board yes)
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@@ -1032,6 +1310,74 @@
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+      (effects (font (size 1.27 1.27)) hide)
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hackamp/hardware/hackamp.kicad_prl

@@ -1,6 +1,6 @@
 {
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hackamp/hardware/hackamp.kicad_sch

@@ -935,7 +935,7 @@
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+      (reference "#PWR0173") (unit 1) (value "GND") (footprint "")
     )
     (path "/00000000-0000-0000-0000-00005fa5bd7a/d8c9ec50-62dd-4f5b-8e80-75cde5d7723b"
       (reference "C43") (unit 1) (value "10uF") (footprint "Capacitor_SMD:C_0805_2012Metric")
@@ -1072,18 +1072,48 @@
     (path "/00000000-0000-0000-0000-00005fa5bdb1/e1ebab83-134d-4ae2-a98d-c0e119f6597c"
       (reference "#PWR0162") (unit 1) (value "GND") (footprint "")
     )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/122fa003-3099-42f8-84a7-4aae62f21254"
+      (reference "#PWR0174") (unit 1) (value "+1V8") (footprint "")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/7d5992a2-bc99-4512-99a4-95d97cc093d3"
+      (reference "#PWR0175") (unit 1) (value "+3V3") (footprint "")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/b257cfa8-07a6-4da5-a956-83064ec30ba9"
+      (reference "#PWR0176") (unit 1) (value "+3V3") (footprint "")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/ece94ac7-d272-40e0-93a4-90cac9ccaba0"
+      (reference "#PWR0177") (unit 1) (value "+1V8") (footprint "")
+    )
     (path "/00000000-0000-0000-0000-00005fa5bdb1/00000000-0000-0000-0000-00005fb85574"
       (reference "J3") (unit 1) (value "USB_B_Micro") (footprint "Connector_USB:USB_Micro-B_Amphenol_10104110_Horizontal")
     )
     (path "/00000000-0000-0000-0000-00005fa5bdb1/00000000-0000-0000-0000-00005fb796d4"
       (reference "J4") (unit 1) (value "BT Antenna") (footprint "Connector_Coaxial:U.FL_Hirose_U.FL-R-SMT-1_Vertical")
     )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/fe0994a6-3508-456e-94d2-6c42f03b1972"
+      (reference "Q1") (unit 1) (value "NX138BK") (footprint "Package_TO_SOT_SMD:SOT-23")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/dea70c17-1314-44ab-be42-9530d99fd3c9"
+      (reference "Q2") (unit 1) (value "NX138BK") (footprint "Package_TO_SOT_SMD:SOT-23")
+    )
     (path "/00000000-0000-0000-0000-00005fa5bdb1/00000000-0000-0000-0000-00005fb855a5"
       (reference "R9") (unit 1) (value "0") (footprint "Resistor_SMD:R_0603_1608Metric")
     )
     (path "/00000000-0000-0000-0000-00005fa5bdb1/00000000-0000-0000-0000-00005fb8559f"
       (reference "R10") (unit 1) (value "0") (footprint "Resistor_SMD:R_0603_1608Metric")
     )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/4818f80e-b784-4ed1-9901-2aec8f6e81d4"
+      (reference "R34") (unit 1) (value "4.7k") (footprint "Resistor_SMD:R_0603_1608Metric")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/105bfb06-7c77-41d9-8ae2-4759724b90ca"
+      (reference "R35") (unit 1) (value "4.7k") (footprint "Resistor_SMD:R_0603_1608Metric")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/97a40cae-2641-4742-9dd1-ad9d0f39140b"
+      (reference "R36") (unit 1) (value "4.7k") (footprint "Resistor_SMD:R_0603_1608Metric")
+    )
+    (path "/00000000-0000-0000-0000-00005fa5bdb1/ded55e10-a2f7-485a-865e-d01178c7a34d"
+      (reference "R37") (unit 1) (value "4.7k") (footprint "Resistor_SMD:R_0603_1608Metric")
+    )
     (path "/00000000-0000-0000-0000-00005fa5bdb1/730090d7-0ea3-492f-8649-594dfc9770be"
       (reference "U8") (unit 1) (value "CSR-A64215-MOD") (footprint "HackAmp-Footprints:CSRA64215")
     )

hackamp/hardware/processor.kicad_sch

@@ -2084,7 +2084,7 @@
   (symbol (lib_id "power:GND") (at 49.53 181.61 0) (unit 1)
     (in_bom yes) (on_board yes)
     (uuid "dfd4c611-8622-4a16-b7be-68071e4f9c72")
-    (property "Reference" "#PWR?" (id 0) (at 49.53 187.96 0)
+    (property "Reference" "#PWR0173" (id 0) (at 49.53 187.96 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (property "Value" "GND" (id 1) (at 49.657 186.0042 0))