maixbit (uart): working on data tx

When the data to send is too long the program gives an exception.

src/machine/board_k210.go

@@ -53,3 +53,265 @@ const (
 	P46 Pin = 46
 	P47 Pin = 47
 )
+
+type FPIOAFunc uint16
+
+// FPIOA functions.
+const (
+	JTAG_TCLK      FPIOAFunc = 0   // JTAG Test Clock
+	JTAG_TDI       FPIOAFunc = 1   // JTAG Test Data In
+	JTAG_TMS       FPIOAFunc = 2   // JTAG Test Mode Select
+	JTAG_TDO       FPIOAFunc = 3   // JTAG Test Data Out
+	SPI0_D0        FPIOAFunc = 4   // SPI0 Data 0
+	SPI0_D1        FPIOAFunc = 5   // SPI0 Data 1
+	SPI0_D2        FPIOAFunc = 6   // SPI0 Data 2
+	SPI0_D3        FPIOAFunc = 7   // SPI0 Data 3
+	SPI0_D4        FPIOAFunc = 8   // SPI0 Data 4
+	SPI0_D5        FPIOAFunc = 9   // SPI0 Data 5
+	SPI0_D6        FPIOAFunc = 10  // SPI0 Data 6
+	SPI0_D7        FPIOAFunc = 11  // SPI0 Data 7
+	SPI0_SS0       FPIOAFunc = 12  // SPI0 Chip Select 0
+	SPI0_SS1       FPIOAFunc = 13  // SPI0 Chip Select 1
+	SPI0_SS2       FPIOAFunc = 14  // SPI0 Chip Select 2
+	SPI0_SS3       FPIOAFunc = 15  // SPI0 Chip Select 3
+	SPI0_ARB       FPIOAFunc = 16  // SPI0 Arbitration
+	SPI0_SCLK      FPIOAFunc = 17  // SPI0 Serial Clock
+	UARTHS_RX      FPIOAFunc = 18  // UART High speed Receiver
+	UARTHS_TX      FPIOAFunc = 19  // UART High speed Transmitter
+	RESV6          FPIOAFunc = 20  // Reserved function
+	RESV7          FPIOAFunc = 21  // Reserved function
+	CLK_SPI1       FPIOAFunc = 22  // Clock SPI1
+	CLK_I2C1       FPIOAFunc = 23  // Clock I2C1
+	GPIOHS0        FPIOAFunc = 24  // GPIO High speed 0
+	GPIOHS1        FPIOAFunc = 25  // GPIO High speed 1
+	GPIOHS2        FPIOAFunc = 26  // GPIO High speed 2
+	GPIOHS3        FPIOAFunc = 27  // GPIO High speed 3
+	GPIOHS4        FPIOAFunc = 28  // GPIO High speed 4
+	GPIOHS5        FPIOAFunc = 29  // GPIO High speed 5
+	GPIOHS6        FPIOAFunc = 30  // GPIO High speed 6
+	GPIOHS7        FPIOAFunc = 31  // GPIO High speed 7
+	GPIOHS8        FPIOAFunc = 32  // GPIO High speed 8
+	GPIOHS9        FPIOAFunc = 33  // GPIO High speed 9
+	GPIOHS10       FPIOAFunc = 34  // GPIO High speed 10
+	GPIOHS11       FPIOAFunc = 35  // GPIO High speed 11
+	GPIOHS12       FPIOAFunc = 36  // GPIO High speed 12
+	GPIOHS13       FPIOAFunc = 37  // GPIO High speed 13
+	GPIOHS14       FPIOAFunc = 38  // GPIO High speed 14
+	GPIOHS15       FPIOAFunc = 39  // GPIO High speed 15
+	GPIOHS16       FPIOAFunc = 40  // GPIO High speed 16
+	GPIOHS17       FPIOAFunc = 41  // GPIO High speed 17
+	GPIOHS18       FPIOAFunc = 42  // GPIO High speed 18
+	GPIOHS19       FPIOAFunc = 43  // GPIO High speed 19
+	GPIOHS20       FPIOAFunc = 44  // GPIO High speed 20
+	GPIOHS21       FPIOAFunc = 45  // GPIO High speed 21
+	GPIOHS22       FPIOAFunc = 46  // GPIO High speed 22
+	GPIOHS23       FPIOAFunc = 47  // GPIO High speed 23
+	GPIOHS24       FPIOAFunc = 48  // GPIO High speed 24
+	GPIOHS25       FPIOAFunc = 49  // GPIO High speed 25
+	GPIOHS26       FPIOAFunc = 50  // GPIO High speed 26
+	GPIOHS27       FPIOAFunc = 51  // GPIO High speed 27
+	GPIOHS28       FPIOAFunc = 52  // GPIO High speed 28
+	GPIOHS29       FPIOAFunc = 53  // GPIO High speed 29
+	GPIOHS30       FPIOAFunc = 54  // GPIO High speed 30
+	GPIOHS31       FPIOAFunc = 55  // GPIO High speed 31
+	GPIO0          FPIOAFunc = 56  // GPIO pin 0
+	GPIO1          FPIOAFunc = 57  // GPIO pin 1
+	GPIO2          FPIOAFunc = 58  // GPIO pin 2
+	GPIO3          FPIOAFunc = 59  // GPIO pin 3
+	GPIO4          FPIOAFunc = 60  // GPIO pin 4
+	GPIO5          FPIOAFunc = 61  // GPIO pin 5
+	GPIO6          FPIOAFunc = 62  // GPIO pin 6
+	GPIO7          FPIOAFunc = 63  // GPIO pin 7
+	UART1_RX       FPIOAFunc = 64  // UART1 Receiver
+	UART1_TX       FPIOAFunc = 65  // UART1 Transmitter
+	UART2_RX       FPIOAFunc = 66  // UART2 Receiver
+	UART2_TX       FPIOAFunc = 67  // UART2 Transmitter
+	UART3_RX       FPIOAFunc = 68  // UART3 Receiver
+	UART3_TX       FPIOAFunc = 69  // UART3 Transmitter
+	SPI1_D0        FPIOAFunc = 70  // SPI1 Data 0
+	SPI1_D1        FPIOAFunc = 71  // SPI1 Data 1
+	SPI1_D2        FPIOAFunc = 72  // SPI1 Data 2
+	SPI1_D3        FPIOAFunc = 73  // SPI1 Data 3
+	SPI1_D4        FPIOAFunc = 74  // SPI1 Data 4
+	SPI1_D5        FPIOAFunc = 75  // SPI1 Data 5
+	SPI1_D6        FPIOAFunc = 76  // SPI1 Data 6
+	SPI1_D7        FPIOAFunc = 77  // SPI1 Data 7
+	SPI1_SS0       FPIOAFunc = 78  // SPI1 Chip Select 0
+	SPI1_SS1       FPIOAFunc = 79  // SPI1 Chip Select 1
+	SPI1_SS2       FPIOAFunc = 80  // SPI1 Chip Select 2
+	SPI1_SS3       FPIOAFunc = 81  // SPI1 Chip Select 3
+	SPI1_ARB       FPIOAFunc = 82  // SPI1 Arbitration
+	SPI1_SCLK      FPIOAFunc = 83  // SPI1 Serial Clock
+	SPI_SLAVE_D0   FPIOAFunc = 84  // SPI Slave Data 0
+	SPI_SLAVE_SS   FPIOAFunc = 85  // SPI Slave Select
+	SPI_SLAVE_SCLK FPIOAFunc = 86  // SPI Slave Serial Clock
+	I2S0_MCLK      FPIOAFunc = 87  // I2S0 Master Clock
+	I2S0_SCLK      FPIOAFunc = 88  // I2S0 Serial Clock(BCLK)
+	I2S0_WS        FPIOAFunc = 89  // I2S0 Word Select(LRCLK)
+	I2S0_IN_D0     FPIOAFunc = 90  // I2S0 Serial Data Input 0
+	I2S0_IN_D1     FPIOAFunc = 91  // I2S0 Serial Data Input 1
+	I2S0_IN_D2     FPIOAFunc = 92  // I2S0 Serial Data Input 2
+	I2S0_IN_D3     FPIOAFunc = 93  // I2S0 Serial Data Input 3
+	I2S0_OUT_D0    FPIOAFunc = 94  // I2S0 Serial Data Output 0
+	I2S0_OUT_D1    FPIOAFunc = 95  // I2S0 Serial Data Output 1
+	I2S0_OUT_D2    FPIOAFunc = 96  // I2S0 Serial Data Output 2
+	I2S0_OUT_D3    FPIOAFunc = 97  // I2S0 Serial Data Output 3
+	I2S1_MCLK      FPIOAFunc = 98  // I2S1 Master Clock
+	I2S1_SCLK      FPIOAFunc = 99  // I2S1 Serial Clock(BCLK)
+	I2S1_WS        FPIOAFunc = 100 // I2S1 Word Select(LRCLK)
+	I2S1_IN_D0     FPIOAFunc = 101 // I2S1 Serial Data Input 0
+	I2S1_IN_D1     FPIOAFunc = 102 // I2S1 Serial Data Input 1
+	I2S1_IN_D2     FPIOAFunc = 103 // I2S1 Serial Data Input 2
+	I2S1_IN_D3     FPIOAFunc = 104 // I2S1 Serial Data Input 3
+	I2S1_OUT_D0    FPIOAFunc = 105 // I2S1 Serial Data Output 0
+	I2S1_OUT_D1    FPIOAFunc = 106 // I2S1 Serial Data Output 1
+	I2S1_OUT_D2    FPIOAFunc = 107 // I2S1 Serial Data Output 2
+	I2S1_OUT_D3    FPIOAFunc = 108 // I2S1 Serial Data Output 3
+	I2S2_MCLK      FPIOAFunc = 109 // I2S2 Master Clock
+	I2S2_SCLK      FPIOAFunc = 110 // I2S2 Serial Clock(BCLK)
+	I2S2_WS        FPIOAFunc = 111 // I2S2 Word Select(LRCLK)
+	I2S2_IN_D0     FPIOAFunc = 112 // I2S2 Serial Data Input 0
+	I2S2_IN_D1     FPIOAFunc = 113 // I2S2 Serial Data Input 1
+	I2S2_IN_D2     FPIOAFunc = 114 // I2S2 Serial Data Input 2
+	I2S2_IN_D3     FPIOAFunc = 115 // I2S2 Serial Data Input 3
+	I2S2_OUT_D0    FPIOAFunc = 116 // I2S2 Serial Data Output 0
+	I2S2_OUT_D1    FPIOAFunc = 117 // I2S2 Serial Data Output 1
+	I2S2_OUT_D2    FPIOAFunc = 118 // I2S2 Serial Data Output 2
+	I2S2_OUT_D3    FPIOAFunc = 119 // I2S2 Serial Data Output 3
+	RESV0          FPIOAFunc = 120 // Reserved function
+	RESV1          FPIOAFunc = 121 // Reserved function
+	RESV2          FPIOAFunc = 122 // Reserved function
+	RESV3          FPIOAFunc = 123 // Reserved function
+	RESV4          FPIOAFunc = 124 // Reserved function
+	RESV5          FPIOAFunc = 125 // Reserved function
+	I2C0_SCLK      FPIOAFunc = 126 // I2C0 Serial Clock
+	I2C0_SDA       FPIOAFunc = 127 // I2C0 Serial Data
+	I2C1_SCLK      FPIOAFunc = 128 // I2C1 Serial Clock
+	I2C1_SDA       FPIOAFunc = 129 // I2C1 Serial Data
+	I2C2_SCLK      FPIOAFunc = 130 // I2C2 Serial Clock
+	I2C2_SDA       FPIOAFunc = 131 // I2C2 Serial Data
+	CMOS_XCLK      FPIOAFunc = 132 // DVP System Clock
+	CMOS_RST       FPIOAFunc = 133 // DVP System Reset
+	CMOS_PWDN      FPIOAFunc = 134 // DVP Power Down Mode
+	CMOS_VSYNC     FPIOAFunc = 135 // DVP Vertical Sync
+	CMOS_HREF      FPIOAFunc = 136 // DVP Horizontal Reference output
+	CMOS_PCLK      FPIOAFunc = 137 // Pixel Clock
+	CMOS_D0        FPIOAFunc = 138 // Data Bit 0
+	CMOS_D1        FPIOAFunc = 139 // Data Bit 1
+	CMOS_D2        FPIOAFunc = 140 // Data Bit 2
+	CMOS_D3        FPIOAFunc = 141 // Data Bit 3
+	CMOS_D4        FPIOAFunc = 142 // Data Bit 4
+	CMOS_D5        FPIOAFunc = 143 // Data Bit 5
+	CMOS_D6        FPIOAFunc = 144 // Data Bit 6
+	CMOS_D7        FPIOAFunc = 145 // Data Bit 7
+	SCCB_SCLK      FPIOAFunc = 146 // SCCB Serial Clock
+	SCCB_SDA       FPIOAFunc = 147 // SCCB Serial Data
+	UART1_CTS      FPIOAFunc = 148 // UART1 Clear To Send
+	UART1_DSR      FPIOAFunc = 149 // UART1 Data Set Ready
+	UART1_DCD      FPIOAFunc = 150 // UART1 Data Carrier Detect
+	UART1_RI       FPIOAFunc = 151 // UART1 Ring Indicator
+	UART1_SIR_IN   FPIOAFunc = 152 // UART1 Serial Infrared Input
+	UART1_DTR      FPIOAFunc = 153 // UART1 Data Terminal Ready
+	UART1_RTS      FPIOAFunc = 154 // UART1 Request To Send
+	UART1_OUT2     FPIOAFunc = 155 // UART1 User-designated Output 2
+	UART1_OUT1     FPIOAFunc = 156 // UART1 User-designated Output 1
+	UART1_SIR_OUT  FPIOAFunc = 157 // UART1 Serial Infrared Output
+	UART1_BAUD     FPIOAFunc = 158 // UART1 Transmit Clock Output
+	UART1_RE       FPIOAFunc = 159 // UART1 Receiver Output Enable
+	UART1_DE       FPIOAFunc = 160 // UART1 Driver Output Enable
+	UART1_RS485_EN FPIOAFunc = 161 // UART1 RS485 Enable
+	UART2_CTS      FPIOAFunc = 162 // UART2 Clear To Send
+	UART2_DSR      FPIOAFunc = 163 // UART2 Data Set Ready
+	UART2_DCD      FPIOAFunc = 164 // UART2 Data Carrier Detect
+	UART2_RI       FPIOAFunc = 165 // UART2 Ring Indicator
+	UART2_SIR_IN   FPIOAFunc = 166 // UART2 Serial Infrared Input
+	UART2_DTR      FPIOAFunc = 167 // UART2 Data Terminal Ready
+	UART2_RTS      FPIOAFunc = 168 // UART2 Request To Send
+	UART2_OUT2     FPIOAFunc = 169 // UART2 User-designated Output 2
+	UART2_OUT1     FPIOAFunc = 170 // UART2 User-designated Output 1
+	UART2_SIR_OUT  FPIOAFunc = 171 // UART2 Serial Infrared Output
+	UART2_BAUD     FPIOAFunc = 172 // UART2 Transmit Clock Output
+	UART2_RE       FPIOAFunc = 173 // UART2 Receiver Output Enable
+	UART2_DE       FPIOAFunc = 174 // UART2 Driver Output Enable
+	UART2_RS485_EN FPIOAFunc = 175 // UART2 RS485 Enable
+	UART3_CTS      FPIOAFunc = 176 // UART3 Clear To Send
+	UART3_DSR      FPIOAFunc = 177 // UART3 Data Set Ready
+	UART3_DCD      FPIOAFunc = 178 // UART3 Data Carrier Detect
+	UART3_RI       FPIOAFunc = 179 // UART3 Ring Indicator
+	UART3_SIR_IN   FPIOAFunc = 180 // UART3 Serial Infrared Input
+	UART3_DTR      FPIOAFunc = 181 // UART3 Data Terminal Ready
+	UART3_RTS      FPIOAFunc = 182 // UART3 Request To Send
+	UART3_OUT2     FPIOAFunc = 183 // UART3 User-designated Output 2
+	UART3_OUT1     FPIOAFunc = 184 // UART3 User-designated Output 1
+	UART3_SIR_OUT  FPIOAFunc = 185 // UART3 Serial Infrared Output
+	UART3_BAUD     FPIOAFunc = 186 // UART3 Transmit Clock Output
+	UART3_RE       FPIOAFunc = 187 // UART3 Receiver Output Enable
+	UART3_DE       FPIOAFunc = 188 // UART3 Driver Output Enable
+	UART3_RS485_EN FPIOAFunc = 189 // UART3 RS485 Enable
+	TIMER0_TOGGLE1 FPIOAFunc = 190 // TIMER0 Toggle Output 1
+	TIMER0_TOGGLE2 FPIOAFunc = 191 // TIMER0 Toggle Output 2
+	TIMER0_TOGGLE3 FPIOAFunc = 192 // TIMER0 Toggle Output 3
+	TIMER0_TOGGLE4 FPIOAFunc = 193 // TIMER0 Toggle Output 4
+	TIMER1_TOGGLE1 FPIOAFunc = 194 // TIMER1 Toggle Output 1
+	TIMER1_TOGGLE2 FPIOAFunc = 195 // TIMER1 Toggle Output 2
+	TIMER1_TOGGLE3 FPIOAFunc = 196 // TIMER1 Toggle Output 3
+	TIMER1_TOGGLE4 FPIOAFunc = 197 // TIMER1 Toggle Output 4
+	TIMER2_TOGGLE1 FPIOAFunc = 198 // TIMER2 Toggle Output 1
+	TIMER2_TOGGLE2 FPIOAFunc = 199 // TIMER2 Toggle Output 2
+	TIMER2_TOGGLE3 FPIOAFunc = 200 // TIMER2 Toggle Output 3
+	TIMER2_TOGGLE4 FPIOAFunc = 201 // TIMER2 Toggle Output 4
+	CLK_SPI2       FPIOAFunc = 202 // Clock SPI2
+	CLK_I2C2       FPIOAFunc = 203 // Clock I2C2
+	INTERNAL0      FPIOAFunc = 204 // Internal function signal 0
+	INTERNAL1      FPIOAFunc = 205 // Internal function signal 1
+	INTERNAL2      FPIOAFunc = 206 // Internal function signal 2
+	INTERNAL3      FPIOAFunc = 207 // Internal function signal 3
+	INTERNAL4      FPIOAFunc = 208 // Internal function signal 4
+	INTERNAL5      FPIOAFunc = 209 // Internal function signal 5
+	INTERNAL6      FPIOAFunc = 210 // Internal function signal 6
+	INTERNAL7      FPIOAFunc = 211 // Internal function signal 7
+	INTERNAL8      FPIOAFunc = 212 // Internal function signal 8
+	INTERNAL9      FPIOAFunc = 213 // Internal function signal 9
+	INTERNAL10     FPIOAFunc = 214 // Internal function signal 10
+	INTERNAL11     FPIOAFunc = 215 // Internal function signal 11
+	INTERNAL12     FPIOAFunc = 216 // Internal function signal 12
+	INTERNAL13     FPIOAFunc = 217 // Internal function signal 13
+	INTERNAL14     FPIOAFunc = 218 // Internal function signal 14
+	INTERNAL15     FPIOAFunc = 219 // Internal function signal 15
+	INTERNAL16     FPIOAFunc = 220 // Internal function signal 16
+	INTERNAL17     FPIOAFunc = 221 // Internal function signal 17
+	CONSTANT       FPIOAFunc = 222 // Constant function
+	INTERNAL18     FPIOAFunc = 223 // Internal function signal 18
+	DEBUG0         FPIOAFunc = 224 // Debug function 0
+	DEBUG1         FPIOAFunc = 225 // Debug function 1
+	DEBUG2         FPIOAFunc = 226 // Debug function 2
+	DEBUG3         FPIOAFunc = 227 // Debug function 3
+	DEBUG4         FPIOAFunc = 228 // Debug function 4
+	DEBUG5         FPIOAFunc = 229 // Debug function 5
+	DEBUG6         FPIOAFunc = 230 // Debug function 6
+	DEBUG7         FPIOAFunc = 231 // Debug function 7
+	DEBUG8         FPIOAFunc = 232 // Debug function 8
+	DEBUG9         FPIOAFunc = 233 // Debug function 9
+	DEBUG10        FPIOAFunc = 234 // Debug function 10
+	DEBUG11        FPIOAFunc = 235 // Debug function 11
+	DEBUG12        FPIOAFunc = 236 // Debug function 12
+	DEBUG13        FPIOAFunc = 237 // Debug function 13
+	DEBUG14        FPIOAFunc = 238 // Debug function 14
+	DEBUG15        FPIOAFunc = 239 // Debug function 15
+	DEBUG16        FPIOAFunc = 240 // Debug function 16
+	DEBUG17        FPIOAFunc = 241 // Debug function 17
+	DEBUG18        FPIOAFunc = 242 // Debug function 18
+	DEBUG19        FPIOAFunc = 243 // Debug function 19
+	DEBUG20        FPIOAFunc = 244 // Debug function 20
+	DEBUG21        FPIOAFunc = 245 // Debug function 21
+	DEBUG22        FPIOAFunc = 246 // Debug function 22
+	DEBUG23        FPIOAFunc = 247 // Debug function 23
+	DEBUG24        FPIOAFunc = 248 // Debug function 24
+	DEBUG25        FPIOAFunc = 249 // Debug function 25
+	DEBUG26        FPIOAFunc = 250 // Debug function 26
+	DEBUG27        FPIOAFunc = 251 // Debug function 27
+	DEBUG28        FPIOAFunc = 252 // Debug function 28
+	DEBUG29        FPIOAFunc = 253 // Debug function 29
+	DEBUG30        FPIOAFunc = 254 // Debug function 30
+	DEBUG31        FPIOAFunc = 255 // Debug function 31
+)

src/machine/board_maixbit.go

@@ -59,3 +59,9 @@ const (
 	LED_GREEN = D4
 	LED_BLUE  = D6
 )
+
+// Default pins for UARTHS
+const (
+	UART_TX_PIN = P05
+	UART_RX_PIN = P04
+)

src/machine/machine_k210.go

@@ -2,8 +2,13 @@
 
 package machine
 
+import (
+	"device/kendryte"
+	"runtime/interrupt"
+)
+
 func CPUFrequency() uint32 {
-	return 400000000
+	return 390000000
 }
 
 type PinMode uint8
@@ -28,3 +33,63 @@ func (p Pin) Set(high bool) {
 func (p Pin) Get() bool {
 	return true
 }
+
+type FPIOA struct {
+	Bus *kendryte.FPIOA_Type
+}
+
+var (
+	FPIOA0 = FPIOA{Bus: kendryte.FPIOA}
+)
+
+func (fpioa FPIOA) Init() {
+	// Enable APB0 clock.
+	kendryte.SYSCTL.CLK_EN_CENT.Set(kendryte.SYSCTL_CLK_EN_CENT_APB0_CLK_EN)
+
+	// Enable FPIOA peripheral.
+	kendryte.SYSCTL.CLK_EN_PERI.Set(kendryte.SYSCTL_CLK_EN_PERI_FPIOA_CLK_EN)
+}
+
+type UART struct {
+	Bus    *kendryte.UARTHS_Type
+	Buffer *RingBuffer
+}
+
+var (
+	UART0 = UART{Bus: kendryte.UARTHS, Buffer: NewRingBuffer()}
+)
+
+func (uart UART) Configure(config UARTConfig) {
+
+	div := CPUFrequency()/115200 - 1
+
+	uart.Bus.DIV.Set(div)
+	uart.Bus.TXCTRL.Set(kendryte.UARTHS_TXCTRL_TXEN)
+	uart.Bus.RXCTRL.Set(kendryte.UARTHS_RXCTRL_RXEN)
+	//uart.Bus.IP.Set(kendryte.UARTHS_IP_TXWM | kendryte.UARTHS_IP_RXWM)
+	//uart.Bus.IE.Set(kendryte.UARTHS_IE_RXWM)
+
+	/*intr := interrupt.New(kendryte.IRQ_UARTHS, UART0.handleInterrupt)
+	intr.SetPriority(5)
+	intr.Enable()*/
+
+}
+
+func (uart UART) handleInterrupt(interrupt.Interrupt) {
+	rxdata := uart.Bus.RXDATA.Get()
+	c := byte(rxdata)
+	if uint32(c) != rxdata {
+		// The rxdata has other bits set than just the low 8 bits. This probably
+		// means that the 'empty' flag is set, which indicates there is no data
+		// to be read and the byte is garbage. Ignore this byte.
+		return
+	}
+	uart.Receive(c)
+}
+
+func (uart UART) WriteByte(c byte) {
+	for uart.Bus.TXDATA.Get()&kendryte.UARTHS_TXDATA_FULL != 0 {
+	}
+
+	uart.Bus.TXDATA.Set(uint32(c))
+}

src/machine/uart.go

@@ -1,4 +1,4 @@
-// +build avr nrf sam sifive stm32
+// +build avr nrf sam sifive stm32 k210
 
 package machine
 

src/runtime/interrupt/interrupt_k210.go

@@ -0,0 +1,19 @@
+// +build k210
+
+package interrupt
+
+import "device/kendryte"
+
+// Enable enables this interrupt. Right after calling this function, the
+// interrupt may be invoked if it was already pending.
+func (irq Interrupt) Enable() {
+	// TODO: Use current hartid
+	kendryte.PLIC.TARGET_ENABLES[0].ENABLE[irq.num/32].SetBits(1 << (uint(irq.num) % 32))
+}
+
+// SetPriority sets the interrupt priority for this interrupt. A higher priority
+// number means a higher priority (unlike Cortex-M). Priority 0 effectively
+// disables the interrupt.
+func (irq Interrupt) SetPriority(priority uint8) {
+	kendryte.PLIC.PRIORITY[irq.num].Set(uint32(priority))
+}

src/runtime/runtime_k210.go

@@ -6,10 +6,11 @@
 package runtime
 
 import (
-	"unsafe"
-
+	"device/kendryte"
 	"device/riscv"
+	"machine"
 	"runtime/volatile"
+	"unsafe"
 )
 
 type timeUnit int64
@@ -18,7 +19,21 @@ func postinit() {}
 
 //export main
 func main() {
-	// todo
+
+	// Only use one core for the moment
+	if riscv.MHARTID.Get() == 0 {
+		// Zero the PLIC enable bits at startup.
+		for i := 0; i < ((kendryte.IRQ_max + 32) / 32); i++ {
+			kendryte.PLIC.TARGET_ENABLES[0].ENABLE[i].Set(0) // core 0
+		}
+
+		// Zero the PLIC threshold bits to allow all interrupts.
+		kendryte.PLIC.TARGETS[0].THRESHOLD.Set(0)
+
+		// Reset all interrupt source priorities to zero.
+		for i := 0; i < kendryte.IRQ_max; i++ {
+			kendryte.PLIC.PRIORITY[i].Set(0)
+		}
 
 		// Set the interrupt address.
 		// Note that this address must be aligned specially, otherwise the MODE bits
@@ -36,6 +51,9 @@ func main() {
 		initPeripherals()
 		run()
 		abort()
+	} else {
+		abort()
+	}
 }
 
 //go:extern handleInterruptASM
@@ -56,11 +74,11 @@ func handleInterrupt() {
 			riscv.MIE.ClearBits(1 << 7) // MTIE bit
 		case 11: // Machine external interrupt
 			// Claim this interrupt.
-			//id := sifive.PLIC.CLAIM.Get()
+			id := kendryte.PLIC.TARGETS[0].CLAIM.Get()
 			// Call the interrupt handler, if any is registered for this ID.
 			callInterruptHandler(int(0))
 			// Complete this interrupt.
-			//sifive.PLIC.CLAIM.Set(id)
+			kendryte.PLIC.TARGETS[0].CLAIM.Set(id)
 		}
 	} else {
 		// Topmost bit is clear, so it is an exception of some sort.
@@ -72,11 +90,14 @@ func handleInterrupt() {
 
 // initPeripherals configures periperhals the way the runtime expects them.
 func initPeripherals() {
-	// todo
+
+	//machine.FPIOA0.Init()
+
+	machine.UART0.Configure(machine.UARTConfig{})
 }
 
 func putchar(c byte) {
-	//machine.UART0.WriteByte(c)
+	machine.UART0.WriteByte(c)
 }
 
 const asyncScheduler = false
@@ -84,11 +105,29 @@ const asyncScheduler = false
 var timerWakeup volatile.Register8
 
 func ticks() timeUnit {
-	// todo
+	highBits := uint32(kendryte.CLINT.MTIME.Get() >> 32)
+	for {
+		lowBits := uint32(kendryte.CLINT.MTIME.Get() & 0xffffffff)
+		newHighBits := uint32(kendryte.CLINT.MTIME.Get() >> 32)
+		if newHighBits == highBits {
+			return timeUnit(lowBits) | (timeUnit(highBits) << 32)
+		}
+		highBits = newHighBits
+	}
 }
 
 func sleepTicks(d timeUnit) {
-	// todo
+	target := uint64(ticks() + d)
+	kendryte.CLINT.MTIMECMP[0].Set(target)
+	riscv.MIE.SetBits(1 << 7) // MTIE
+	for {
+		if timerWakeup.Get() != 0 {
+			timerWakeup.Set(0)
+			// Disable timer.
+			break
+		}
+		riscv.Asm("wfi")
+	}
 }
 
 // handleException is called from the interrupt handler for any exception.

src/runtime/runtime_k210_baremetal.go

@@ -7,7 +7,7 @@ import (
 	"device/riscv"
 )
 
-var clockFrequency uint32 = kendryte.SYSCTL.CLK_FREQ.Get()
+var clockFrequency int64 = int64(kendryte.SYSCTL.CLK_FREQ.Get())
 
 // ticksToNanoseconds converts RTC ticks to nanoseconds.
 func ticksToNanoseconds(ticks timeUnit) int64 {

targets/maixbit.json

@@ -2,5 +2,5 @@
 	"inherits": ["k210"],
 	"build-tags": ["maixbit"],
 	"linkerscript": "targets/maixbit.ld",
-	"flash-command": "kflash -p {port} {hex}"
+	"flash-command": "kflash -p {port} {bin}"
 }