diff --git a/src/machine/machine_atsamd51.go b/src/machine/machine_atsamd51.go
index 78617444..186a510c 100644
--- a/src/machine/machine_atsamd51.go
+++ b/src/machine/machine_atsamd51.go
@@ -130,6 +130,70 @@ const (
 	PB29 Pin = 61
 	PB30 Pin = 62
 	PB31 Pin = 63
+	PC00 Pin = 64
+	PC01 Pin = 65
+	PC02 Pin = 66
+	PC03 Pin = 67
+	PC04 Pin = 68
+	PC05 Pin = 69
+	PC06 Pin = 70
+	PC07 Pin = 71
+	PC08 Pin = 72
+	PC09 Pin = 73
+	PC10 Pin = 74
+	PC11 Pin = 75
+	PC12 Pin = 76
+	PC13 Pin = 77
+	PC14 Pin = 78
+	PC15 Pin = 79
+	PC16 Pin = 80
+	PC17 Pin = 81
+	PC18 Pin = 82
+	PC19 Pin = 83
+	PC20 Pin = 84
+	PC21 Pin = 85
+	PC22 Pin = 86
+	PC23 Pin = 87
+	PC24 Pin = 88
+	PC25 Pin = 89
+	PC26 Pin = 90
+	PC27 Pin = 91
+	PC28 Pin = 92
+	PC29 Pin = 93
+	PC30 Pin = 94
+	PC31 Pin = 95
+	PD00 Pin = 96
+	PD01 Pin = 97
+	PD02 Pin = 98
+	PD03 Pin = 99
+	PD04 Pin = 100
+	PD05 Pin = 101
+	PD06 Pin = 102
+	PD07 Pin = 103
+	PD08 Pin = 104
+	PD09 Pin = 105
+	PD10 Pin = 106
+	PD11 Pin = 107
+	PD12 Pin = 108
+	PD13 Pin = 109
+	PD14 Pin = 110
+	PD15 Pin = 111
+	PD16 Pin = 112
+	PD17 Pin = 113
+	PD18 Pin = 114
+	PD19 Pin = 115
+	PD20 Pin = 116
+	PD21 Pin = 117
+	PD22 Pin = 118
+	PD23 Pin = 119
+	PD24 Pin = 120
+	PD25 Pin = 121
+	PD26 Pin = 122
+	PD27 Pin = 123
+	PD28 Pin = 124
+	PD29 Pin = 125
+	PD30 Pin = 126
+	PD31 Pin = 127
 )
 
 const (