diff --git a/Sources/HTU21D/HTU21D.swift b/Sources/HTU21D/HTU21D.swift
index aae5a5b..fa15c0b 100644
--- a/Sources/HTU21D/HTU21D.swift
+++ b/Sources/HTU21D/HTU21D.swift
@@ -165,9 +165,10 @@ extension HTU21D {
 
 }
 
-
-public enum HTU21DError: Error {
-    case readError
-    case writeError
-    case crcError
-}
+public extension HTU21D {
+    enum HTU21DError: Error {
+        case readError
+        case writeError
+        case crcError
+    }
+}
\ No newline at end of file
diff --git a/Sources/SGP30/SGP30.swift b/Sources/SGP30/SGP30.swift
index 2e5a2a9..e097257 100644
--- a/Sources/SGP30/SGP30.swift
+++ b/Sources/SGP30/SGP30.swift
@@ -269,12 +269,12 @@ extension SGP30 {
 
 }
 
-@_extern(c, "exp2f")
-func exp2f(_: Float) -> Float
+@_extern(c, "expf")
+func expf(_: Float) -> Float
 
 extension Float {
   @_transparent
   static func exp(_ x: Float) -> Float {
-    exp2f(x)
+    expf(x)
   }
 }
\ No newline at end of file
diff --git a/Sources/TCS34725/TCS34725.swift b/Sources/TCS34725/TCS34725.swift
index b35394b..e0d5c49 100644
--- a/Sources/TCS34725/TCS34725.swift
+++ b/Sources/TCS34725/TCS34725.swift
@@ -351,11 +351,13 @@ extension TCS34725 {
 @_extern(c, "pow")
 func powf(_: Float, _ : Float) -> Float
 
-extension Float {
+private extension Float {
   @_transparent
   static func pow(_ x: Float, _ y: Float) -> Float {
     guard x >= 0 else { return .nan }
     if x == 0 && y == 0 { return .nan }
+    let result = powf(x, y)
+    print("powf(\(x), \(y)) result = \(result)")
     return powf(x, y)
   }
 }
\ No newline at end of file
diff --git a/Tests/ADT7410Tests/ADT7410Tests.swift b/Tests/ADT7410Tests/ADT7410Tests.swift
index a86792a..84e8d67 100644
--- a/Tests/ADT7410Tests/ADT7410Tests.swift
+++ b/Tests/ADT7410Tests/ADT7410Tests.swift
@@ -6,31 +6,31 @@ import SwiftIO
 final class ADT7410Tests: XCTestCase {
     
     func testToTemp13Bit(){
-        let resulution = ADT7410.Resulution.r_13Bit
-        XCTAssertEqual(-55,ADT7410.toTemp(resulution,[0b1110_0100,0b1000_0000]))
-        XCTAssertEqual(-50,ADT7410.toTemp(resulution, [0b1110_0111,0b0000_0000]))
-        XCTAssertEqual(-25,ADT7410.toTemp(resulution, [0b1111_0011,0b1000_0000]))
-        XCTAssertEqual(-0.0625,ADT7410.toTemp(resulution, [0b1111_1111,0b1111_1000]))
-        XCTAssertEqual(0,ADT7410.toTemp(resulution, [0b0000_0000,0b0000_0000]))
-        XCTAssertEqual(0.0625,ADT7410.toTemp(resulution, [0b0000_0000,0b0000_1000]))
-        XCTAssertEqual(25,ADT7410.toTemp(resulution, [0b0000_1100,0b1000_0000]))
-        XCTAssertEqual(50,ADT7410.toTemp(resulution, [0b0001_1001,0b0000_0000]))
-        XCTAssertEqual(125,ADT7410.toTemp(resulution, [0b0011_1110,0b1000_0000]))
-        XCTAssertEqual(150,ADT7410.toTemp(resulution, [0b0100_1011,0b0000_0000]))
+        let resolution = ADT7410.Resolution.r_13Bit
+        XCTAssertEqual(-55,ADT7410.toTemp(resolution,[0b1110_0100,0b1000_0000]))
+        XCTAssertEqual(-50,ADT7410.toTemp(resolution, [0b1110_0111,0b0000_0000]))
+        XCTAssertEqual(-25,ADT7410.toTemp(resolution, [0b1111_0011,0b1000_0000]))
+        XCTAssertEqual(-0.0625,ADT7410.toTemp(resolution, [0b1111_1111,0b1111_1000]))
+        XCTAssertEqual(0,ADT7410.toTemp(resolution, [0b0000_0000,0b0000_0000]))
+        XCTAssertEqual(0.0625,ADT7410.toTemp(resolution, [0b0000_0000,0b0000_1000]))
+        XCTAssertEqual(25,ADT7410.toTemp(resolution, [0b0000_1100,0b1000_0000]))
+        XCTAssertEqual(50,ADT7410.toTemp(resolution, [0b0001_1001,0b0000_0000]))
+        XCTAssertEqual(125,ADT7410.toTemp(resolution, [0b0011_1110,0b1000_0000]))
+        XCTAssertEqual(150,ADT7410.toTemp(resolution, [0b0100_1011,0b0000_0000]))
     }
     
     func testToData13Bit(){
-        let resulution = ADT7410.Resulution.r_13Bit
-        XCTAssertEqual([0b1110_0100,0b1000_0000],ADT7410.toData(resulution,-55))
-        XCTAssertEqual([0b1110_0111,0b0000_0000],ADT7410.toData(resulution,-50))
-        XCTAssertEqual([0b1111_0011,0b1000_0000],ADT7410.toData(resulution,-25))
-        XCTAssertEqual([0b1111_1111,0b1111_1000],ADT7410.toData(resulution,-0.0625))
-        XCTAssertEqual([0b0000_0000,0b0000_0000],ADT7410.toData(resulution,0))
-        XCTAssertEqual([0b0000_0000,0b0000_1000],ADT7410.toData(resulution,0.0625))
-        XCTAssertEqual([0b0000_1100,0b1000_0000],ADT7410.toData(resulution,25))
-        XCTAssertEqual([0b0001_1001,0b0000_0000],ADT7410.toData(resulution,50))
-        XCTAssertEqual([0b0011_1110,0b1000_0000],ADT7410.toData(resulution,125))
-        XCTAssertEqual([0b0100_1011,0b0000_0000],ADT7410.toData(resulution,150))
+        let resolution = ADT7410.Resolution.r_13Bit
+        XCTAssertEqual([0b1110_0100,0b1000_0000],ADT7410.toData(resolution,-55))
+        XCTAssertEqual([0b1110_0111,0b0000_0000],ADT7410.toData(resolution,-50))
+        XCTAssertEqual([0b1111_0011,0b1000_0000],ADT7410.toData(resolution,-25))
+        XCTAssertEqual([0b1111_1111,0b1111_1000],ADT7410.toData(resolution,-0.0625))
+        XCTAssertEqual([0b0000_0000,0b0000_0000],ADT7410.toData(resolution,0))
+        XCTAssertEqual([0b0000_0000,0b0000_1000],ADT7410.toData(resolution,0.0625))
+        XCTAssertEqual([0b0000_1100,0b1000_0000],ADT7410.toData(resolution,25))
+        XCTAssertEqual([0b0001_1001,0b0000_0000],ADT7410.toData(resolution,50))
+        XCTAssertEqual([0b0011_1110,0b1000_0000],ADT7410.toData(resolution,125))
+        XCTAssertEqual([0b0100_1011,0b0000_0000],ADT7410.toData(resolution,150))
     }
         
     func testDefaultConfiguration(){
@@ -117,11 +117,11 @@ final class ADT7410Tests: XCTestCase {
     func testConfigurationResolution(){
         var config = ADT7410.Configuration()
         
-        config.resulution = .r_13Bit
+        config.resolution = .r_13Bit
         XCTAssertEqual(0b0, config.getByte())
         XCTAssertEqual(config, ADT7410.Configuration(config.getByte()))
         
-        config.resulution = .r_16Bit
+        config.resolution = .r_16Bit
         XCTAssertEqual(0b1 << 7, config.getByte())
         XCTAssertEqual(config, ADT7410.Configuration(config.getByte()))
     }