Add ILI9341 TFT driver (SPI) for ATSAMD2x (#174)

* ILI9341: Add ILI9341 SPI support for for ATSAMD2x

Makefile

@@ -65,10 +65,14 @@ smoke-test:
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic
 	@md5sum ./build/test.hex
+	tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/basic
+	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/pyportal_boing
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/scroll
 	@md5sum ./build/test.hex
+	tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/scroll
+	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis3dh/main.go
 	@md5sum ./build/test.hex
 	tinygo build -size short -o ./build/test.hex -target=microbit ./examples/lsm303agr/main.go

examples/ili9341/basic/atsamd21.go

@@ -0,0 +1,29 @@
+// +build atsamd21
+
+package main
+
+import (
+	"machine"
+
+	"tinygo.org/x/drivers/ili9341"
+)
+
+var (
+	display = ili9341.NewSpi(
+		machine.SPI0,
+		machine.D0,
+		machine.D1,
+		machine.D2,
+	)
+
+	backlight = machine.D3
+)
+
+func init() {
+	machine.SPI0.Configure(machine.SPIConfig{
+		SCK:       machine.SPI0_SCK_PIN,
+		SDO:       machine.SPI0_SDO_PIN,
+		SDI:       machine.SPI0_SDI_PIN,
+		Frequency: 24000000,
+	})
+}

examples/ili9341/scroll/atsamd21.go

@@ -0,0 +1,29 @@
+// +build atsamd21
+
+package main
+
+import (
+	"machine"
+
+	"tinygo.org/x/drivers/ili9341"
+)
+
+var (
+	display = ili9341.NewSpi(
+		machine.SPI0,
+		machine.D0,
+		machine.D1,
+		machine.D2,
+	)
+
+	backlight = machine.D3
+)
+
+func init() {
+	machine.SPI0.Configure(machine.SPIConfig{
+		SCK:       machine.SPI0_SCK_PIN,
+		SDO:       machine.SPI0_SDO_PIN,
+		SDI:       machine.SPI0_SDI_PIN,
+		Frequency: 24000000,
+	})
+}

ili9341/spi_atsamd21.go

@@ -0,0 +1,116 @@
+// +build atsamd21
+
+package ili9341
+
+import (
+	"device/sam"
+	"machine"
+)
+
+type spiDriver struct {
+	bus machine.SPI
+}
+
+func NewSpi(bus machine.SPI, dc, cs, rst machine.Pin) *Device {
+	return &Device{
+		dc:  dc,
+		cs:  cs,
+		rst: rst,
+		rd:  machine.NoPin,
+		driver: &spiDriver{
+			bus: bus,
+		},
+	}
+}
+
+func (pd *spiDriver) configure(config *Config) {
+}
+
+func (pd *spiDriver) write8(b byte) {
+	pd.bus.Bus.CTRLB.ClearBits(sam.SERCOM_SPI_CTRLB_RXEN)
+
+	for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+	}
+	pd.bus.Bus.DATA.Set(uint32(b))
+
+	pd.bus.Bus.CTRLB.SetBits(sam.SERCOM_SPI_CTRLB_RXEN)
+	for pd.bus.Bus.SYNCBUSY.HasBits(sam.SERCOM_SPI_SYNCBUSY_CTRLB) {
+	}
+}
+
+func (pd *spiDriver) write8n(b byte, n int) {
+	pd.bus.Bus.CTRLB.ClearBits(sam.SERCOM_SPI_CTRLB_RXEN)
+
+	for i, c := 0, n; i < c; i++ {
+		for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+		}
+		pd.bus.Bus.DATA.Set(uint32(b))
+	}
+
+	pd.bus.Bus.CTRLB.SetBits(sam.SERCOM_SPI_CTRLB_RXEN)
+	for pd.bus.Bus.SYNCBUSY.HasBits(sam.SERCOM_SPI_SYNCBUSY_CTRLB) {
+	}
+}
+
+func (pd *spiDriver) write8sl(b []byte) {
+	pd.bus.Bus.CTRLB.ClearBits(sam.SERCOM_SPI_CTRLB_RXEN)
+
+	for i, c := 0, len(b); i < c; i++ {
+		for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+		}
+		pd.bus.Bus.DATA.Set(uint32(b[i]))
+	}
+
+	pd.bus.Bus.CTRLB.SetBits(sam.SERCOM_SPI_CTRLB_RXEN)
+	for pd.bus.Bus.SYNCBUSY.HasBits(sam.SERCOM_SPI_SYNCBUSY_CTRLB) {
+	}
+}
+
+func (pd *spiDriver) write16(data uint16) {
+	pd.bus.Bus.CTRLB.ClearBits(sam.SERCOM_SPI_CTRLB_RXEN)
+
+	for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+	}
+	pd.bus.Bus.DATA.Set(uint32(uint8(data >> 8)))
+	for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+	}
+	pd.bus.Bus.DATA.Set(uint32(uint8(data)))
+
+	pd.bus.Bus.CTRLB.SetBits(sam.SERCOM_SPI_CTRLB_RXEN)
+	for pd.bus.Bus.SYNCBUSY.HasBits(sam.SERCOM_SPI_SYNCBUSY_CTRLB) {
+	}
+}
+
+func (pd *spiDriver) write16n(data uint16, n int) {
+	pd.bus.Bus.CTRLB.ClearBits(sam.SERCOM_SPI_CTRLB_RXEN)
+
+	for i := 0; i < n; i++ {
+		for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+		}
+		pd.bus.Bus.DATA.Set(uint32(uint8(data >> 8)))
+		for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+		}
+		pd.bus.Bus.DATA.Set(uint32(uint8(data)))
+	}
+
+	pd.bus.Bus.CTRLB.SetBits(sam.SERCOM_SPI_CTRLB_RXEN)
+	for pd.bus.Bus.SYNCBUSY.HasBits(sam.SERCOM_SPI_SYNCBUSY_CTRLB) {
+	}
+}
+
+func (pd *spiDriver) write16sl(data []uint16) {
+	pd.bus.Bus.CTRLB.ClearBits(sam.SERCOM_SPI_CTRLB_RXEN)
+
+	for i, c := 0, len(data); i < c; i++ {
+		for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+		}
+		pd.bus.Bus.DATA.Set(uint32(uint8(data[i] >> 8)))
+		for !pd.bus.Bus.INTFLAG.HasBits(sam.SERCOM_SPI_INTFLAG_DRE) {
+		}
+		pd.bus.Bus.DATA.Set(uint32(uint8(data[i])))
+	}
+
+	pd.bus.Bus.CTRLB.SetBits(sam.SERCOM_SPI_CTRLB_RXEN)
+	for pd.bus.Bus.SYNCBUSY.HasBits(sam.SERCOM_SPI_SYNCBUSY_CTRLB) {
+	}
+}