rp2040: SPI implementation

src/machine/board_feather_rp2040.go

@@ -8,3 +8,20 @@ const (
 	// Onboard crystal oscillator frequency, in MHz.
 	xoscFreq = 12 // MHz
 )
+
+// SPI default pins
+const (
+	// Default Serial Clock Bus 0 for SPI communications
+	SPI0_SCK_PIN = GPIO18
+	// Default Serial Out Bus 0 for SPI communications
+	SPI0_SDO_PIN = GPIO19 // Tx
+	// Default Serial In Bus 0 for SPI communications
+	SPI0_SDI_PIN = GPIO20 // Rx
+
+	// Default Serial Clock Bus 1 for SPI communications
+	SPI1_SCK_PIN = GPIO10
+	// Default Serial Out Bus 1 for SPI communications
+	SPI1_SDO_PIN = GPIO11 // Tx
+	// Default Serial In Bus 1 for SPI communications
+	SPI1_SDI_PIN = GPIO12 // Rx
+)

src/machine/board_nano-rp2040.go

@@ -53,11 +53,16 @@ const (
 	SCL_PIN Pin = GPIO13
 )
 
-// SPI pins
+// SPI pins. SPI1 not available on Nano RP2040 Connect.
 const (
 	SPI0_SCK_PIN Pin = GPIO6
 	SPI0_SDO_PIN Pin = GPIO7
 	SPI0_SDI_PIN Pin = GPIO4
+
+	// GPIO22 does not have SPI functionality so we set it to avoid interfering with NINA.
+	SPI1_SCK_PIN Pin = GPIO22
+	SPI1_SDO_PIN Pin = GPIO22
+	SPI1_SDI_PIN Pin = GPIO22
 )
 
 // NINA-W102 Pins

src/machine/board_pico.go

@@ -37,3 +37,20 @@ const (
 	// Onboard crystal oscillator frequency, in MHz.
 	xoscFreq = 12 // MHz
 )
+
+// SPI default pins
+const (
+	// Default Serial Clock Bus 0 for SPI communications
+	SPI0_SCK_PIN = GPIO18
+	// Default Serial Out Bus 0 for SPI communications
+	SPI0_SDO_PIN = GPIO19 // Tx
+	// Default Serial In Bus 0 for SPI communications
+	SPI0_SDI_PIN = GPIO16 // Rx
+
+	// Default Serial Clock Bus 1 for SPI communications
+	SPI1_SCK_PIN = GPIO10
+	// Default Serial Out Bus 1 for SPI communications
+	SPI1_SDO_PIN = GPIO11 // Tx
+	// Default Serial In Bus 1 for SPI communications
+	SPI1_SDI_PIN = GPIO12 // Rx
+)

src/machine/machine_rp2040_gpio.go

@@ -68,6 +68,7 @@ const (
 	PinInputPullup
 	PinAnalog
 	PinUART
+	PinSPI
 )
 
 // set drives the pin high
@@ -155,6 +156,8 @@ func (p Pin) Configure(config PinConfig) {
 		p.pulloff()
 	case PinUART:
 		p.setFunc(fnUART)
+	case PinSPI:
+		p.setFunc(fnSPI)
 	}
 }