maixbit: add I2C support

1 files changed, 297 insertions, 0 deletions

diff --git a/src/machine/board_k210.go b/src/machine/board_k210.go
index 4474728d7..2b934e5ec 100644
--- a/src/machine/board_k210.go
+++ b/src/machine/board_k210.go
@@ -55,3 +55,300 @@ const (
 	P46 Pin = 46
 	P47 Pin = 47
 )
+
+type FPIOAFunction uint8
+
+// Every pin on the Kendryte K210 is assigned to an FPIOA function.
+// Each pin can be configured with every function below.
+const (
+	FUNC_JTAG_TCLK      FPIOAFunction = 0   // JTAG Test Clock
+	FUNC_JTAG_TDI       FPIOAFunction = 1   // JTAG Test Data In
+	FUNC_JTAG_TMS       FPIOAFunction = 2   // JTAG Test Mode Select
+	FUNC_JTAG_TDO       FPIOAFunction = 3   // JTAG Test Data Out
+	FUNC_SPI0_D0        FPIOAFunction = 4   // SPI0 Data 0
+	FUNC_SPI0_D1        FPIOAFunction = 5   // SPI0 Data 1
+	FUNC_SPI0_D2        FPIOAFunction = 6   // SPI0 Data 2
+	FUNC_SPI0_D3        FPIOAFunction = 7   // SPI0 Data 3
+	FUNC_SPI0_D4        FPIOAFunction = 8   // SPI0 Data 4
+	FUNC_SPI0_D5        FPIOAFunction = 9   // SPI0 Data 5
+	FUNC_SPI0_D6        FPIOAFunction = 10  // SPI0 Data 6
+	FUNC_SPI0_D7        FPIOAFunction = 11  // SPI0 Data 7
+	FUNC_SPI0_SS0       FPIOAFunction = 12  // SPI0 Chip Select 0
+	FUNC_SPI0_SS1       FPIOAFunction = 13  // SPI0 Chip Select 1
+	FUNC_SPI0_SS2       FPIOAFunction = 14  // SPI0 Chip Select 2
+	FUNC_SPI0_SS3       FPIOAFunction = 15  // SPI0 Chip Select 3
+	FUNC_SPI0_ARB       FPIOAFunction = 16  // SPI0 Arbitration
+	FUNC_SPI0_SCLK      FPIOAFunction = 17  // SPI0 Serial Clock
+	FUNC_UARTHS_RX      FPIOAFunction = 18  // UART High speed Receiver
+	FUNC_UARTHS_TX      FPIOAFunction = 19  // UART High speed Transmitter
+	FUNC_RESV6          FPIOAFunction = 20  // Reserved function
+	FUNC_RESV7          FPIOAFunction = 21  // Reserved function
+	FUNC_CLK_SPI1       FPIOAFunction = 22  // Clock SPI1
+	FUNC_CLK_I2C1       FPIOAFunction = 23  // Clock I2C1
+	FUNC_GPIOHS0        FPIOAFunction = 24  // GPIO High speed 0
+	FUNC_GPIOHS1        FPIOAFunction = 25  // GPIO High speed 1
+	FUNC_GPIOHS2        FPIOAFunction = 26  // GPIO High speed 2
+	FUNC_GPIOHS3        FPIOAFunction = 27  // GPIO High speed 3
+	FUNC_GPIOHS4        FPIOAFunction = 28  // GPIO High speed 4
+	FUNC_GPIOHS5        FPIOAFunction = 29  // GPIO High speed 5
+	FUNC_GPIOHS6        FPIOAFunction = 30  // GPIO High speed 6
+	FUNC_GPIOHS7        FPIOAFunction = 31  // GPIO High speed 7
+	FUNC_GPIOHS8        FPIOAFunction = 32  // GPIO High speed 8
+	FUNC_GPIOHS9        FPIOAFunction = 33  // GPIO High speed 9
+	FUNC_GPIOHS10       FPIOAFunction = 34  // GPIO High speed 10
+	FUNC_GPIOHS11       FPIOAFunction = 35  // GPIO High speed 11
+	FUNC_GPIOHS12       FPIOAFunction = 36  // GPIO High speed 12
+	FUNC_GPIOHS13       FPIOAFunction = 37  // GPIO High speed 13
+	FUNC_GPIOHS14       FPIOAFunction = 38  // GPIO High speed 14
+	FUNC_GPIOHS15       FPIOAFunction = 39  // GPIO High speed 15
+	FUNC_GPIOHS16       FPIOAFunction = 40  // GPIO High speed 16
+	FUNC_GPIOHS17       FPIOAFunction = 41  // GPIO High speed 17
+	FUNC_GPIOHS18       FPIOAFunction = 42  // GPIO High speed 18
+	FUNC_GPIOHS19       FPIOAFunction = 43  // GPIO High speed 19
+	FUNC_GPIOHS20       FPIOAFunction = 44  // GPIO High speed 20
+	FUNC_GPIOHS21       FPIOAFunction = 45  // GPIO High speed 21
+	FUNC_GPIOHS22       FPIOAFunction = 46  // GPIO High speed 22
+	FUNC_GPIOHS23       FPIOAFunction = 47  // GPIO High speed 23
+	FUNC_GPIOHS24       FPIOAFunction = 48  // GPIO High speed 24
+	FUNC_GPIOHS25       FPIOAFunction = 49  // GPIO High speed 25
+	FUNC_GPIOHS26       FPIOAFunction = 50  // GPIO High speed 26
+	FUNC_GPIOHS27       FPIOAFunction = 51  // GPIO High speed 27
+	FUNC_GPIOHS28       FPIOAFunction = 52  // GPIO High speed 28
+	FUNC_GPIOHS29       FPIOAFunction = 53  // GPIO High speed 29
+	FUNC_GPIOHS30       FPIOAFunction = 54  // GPIO High speed 30
+	FUNC_GPIOHS31       FPIOAFunction = 55  // GPIO High speed 31
+	FUNC_GPIO0          FPIOAFunction = 56  // GPIO pin 0
+	FUNC_GPIO1          FPIOAFunction = 57  // GPIO pin 1
+	FUNC_GPIO2          FPIOAFunction = 58  // GPIO pin 2
+	FUNC_GPIO3          FPIOAFunction = 59  // GPIO pin 3
+	FUNC_GPIO4          FPIOAFunction = 60  // GPIO pin 4
+	FUNC_GPIO5          FPIOAFunction = 61  // GPIO pin 5
+	FUNC_GPIO6          FPIOAFunction = 62  // GPIO pin 6
+	FUNC_GPIO7          FPIOAFunction = 63  // GPIO pin 7
+	FUNC_UART1_RX       FPIOAFunction = 64  // UART1 Receiver
+	FUNC_UART1_TX       FPIOAFunction = 65  // UART1 Transmitter
+	FUNC_UART2_RX       FPIOAFunction = 66  // UART2 Receiver
+	FUNC_UART2_TX       FPIOAFunction = 67  // UART2 Transmitter
+	FUNC_UART3_RX       FPIOAFunction = 68  // UART3 Receiver
+	FUNC_UART3_TX       FPIOAFunction = 69  // UART3 Transmitter
+	FUNC_SPI1_D0        FPIOAFunction = 70  // SPI1 Data 0
+	FUNC_SPI1_D1        FPIOAFunction = 71  // SPI1 Data 1
+	FUNC_SPI1_D2        FPIOAFunction = 72  // SPI1 Data 2
+	FUNC_SPI1_D3        FPIOAFunction = 73  // SPI1 Data 3
+	FUNC_SPI1_D4        FPIOAFunction = 74  // SPI1 Data 4
+	FUNC_SPI1_D5        FPIOAFunction = 75  // SPI1 Data 5
+	FUNC_SPI1_D6        FPIOAFunction = 76  // SPI1 Data 6
+	FUNC_SPI1_D7        FPIOAFunction = 77  // SPI1 Data 7
+	FUNC_SPI1_SS0       FPIOAFunction = 78  // SPI1 Chip Select 0
+	FUNC_SPI1_SS1       FPIOAFunction = 79  // SPI1 Chip Select 1
+	FUNC_SPI1_SS2       FPIOAFunction = 80  // SPI1 Chip Select 2
+	FUNC_SPI1_SS3       FPIOAFunction = 81  // SPI1 Chip Select 3
+	FUNC_SPI1_ARB       FPIOAFunction = 82  // SPI1 Arbitration
+	FUNC_SPI1_SCLK      FPIOAFunction = 83  // SPI1 Serial Clock
+	FUNC_SPI_SLAVE_D0   FPIOAFunction = 84  // SPI Slave Data 0
+	FUNC_SPI_SLAVE_SS   FPIOAFunction = 85  // SPI Slave Select
+	FUNC_SPI_SLAVE_SCLK FPIOAFunction = 86  // SPI Slave Serial Clock
+	FUNC_I2S0_MCLK      FPIOAFunction = 87  // I2S0 Master Clock
+	FUNC_I2S0_SCLK      FPIOAFunction = 88  // I2S0 Serial Clock(BCLK)
+	FUNC_I2S0_WS        FPIOAFunction = 89  // I2S0 Word Select(LRCLK)
+	FUNC_I2S0_IN_D0     FPIOAFunction = 90  // I2S0 Serial Data Input 0
+	FUNC_I2S0_IN_D1     FPIOAFunction = 91  // I2S0 Serial Data Input 1
+	FUNC_I2S0_IN_D2     FPIOAFunction = 92  // I2S0 Serial Data Input 2
+	FUNC_I2S0_IN_D3     FPIOAFunction = 93  // I2S0 Serial Data Input 3
+	FUNC_I2S0_OUT_D0    FPIOAFunction = 94  // I2S0 Serial Data Output 0
+	FUNC_I2S0_OUT_D1    FPIOAFunction = 95  // I2S0 Serial Data Output 1
+	FUNC_I2S0_OUT_D2    FPIOAFunction = 96  // I2S0 Serial Data Output 2
+	FUNC_I2S0_OUT_D3    FPIOAFunction = 97  // I2S0 Serial Data Output 3
+	FUNC_I2S1_MCLK      FPIOAFunction = 98  // I2S1 Master Clock
+	FUNC_I2S1_SCLK      FPIOAFunction = 99  // I2S1 Serial Clock(BCLK)
+	FUNC_I2S1_WS        FPIOAFunction = 100 // I2S1 Word Select(LRCLK)
+	FUNC_I2S1_IN_D0     FPIOAFunction = 101 // I2S1 Serial Data Input 0
+	FUNC_I2S1_IN_D1     FPIOAFunction = 102 // I2S1 Serial Data Input 1
+	FUNC_I2S1_IN_D2     FPIOAFunction = 103 // I2S1 Serial Data Input 2
+	FUNC_I2S1_IN_D3     FPIOAFunction = 104 // I2S1 Serial Data Input 3
+	FUNC_I2S1_OUT_D0    FPIOAFunction = 105 // I2S1 Serial Data Output 0
+	FUNC_I2S1_OUT_D1    FPIOAFunction = 106 // I2S1 Serial Data Output 1
+	FUNC_I2S1_OUT_D2    FPIOAFunction = 107 // I2S1 Serial Data Output 2
+	FUNC_I2S1_OUT_D3    FPIOAFunction = 108 // I2S1 Serial Data Output 3
+	FUNC_I2S2_MCLK      FPIOAFunction = 109 // I2S2 Master Clock
+	FUNC_I2S2_SCLK      FPIOAFunction = 110 // I2S2 Serial Clock(BCLK)
+	FUNC_I2S2_WS        FPIOAFunction = 111 // I2S2 Word Select(LRCLK)
+	FUNC_I2S2_IN_D0     FPIOAFunction = 112 // I2S2 Serial Data Input 0
+	FUNC_I2S2_IN_D1     FPIOAFunction = 113 // I2S2 Serial Data Input 1
+	FUNC_I2S2_IN_D2     FPIOAFunction = 114 // I2S2 Serial Data Input 2
+	FUNC_I2S2_IN_D3     FPIOAFunction = 115 // I2S2 Serial Data Input 3
+	FUNC_I2S2_OUT_D0    FPIOAFunction = 116 // I2S2 Serial Data Output 0
+	FUNC_I2S2_OUT_D1    FPIOAFunction = 117 // I2S2 Serial Data Output 1
+	FUNC_I2S2_OUT_D2    FPIOAFunction = 118 // I2S2 Serial Data Output 2
+	FUNC_I2S2_OUT_D3    FPIOAFunction = 119 // I2S2 Serial Data Output 3
+	FUNC_RESV0          FPIOAFunction = 120 // Reserved function
+	FUNC_RESV1          FPIOAFunction = 121 // Reserved function
+	FUNC_RESV2          FPIOAFunction = 122 // Reserved function
+	FUNC_RESV3          FPIOAFunction = 123 // Reserved function
+	FUNC_RESV4          FPIOAFunction = 124 // Reserved function
+	FUNC_RESV5          FPIOAFunction = 125 // Reserved function
+	FUNC_I2C0_SCLK      FPIOAFunction = 126 // I2C0 Serial Clock
+	FUNC_I2C0_SDA       FPIOAFunction = 127 // I2C0 Serial Data
+	FUNC_I2C1_SCLK      FPIOAFunction = 128 // I2C1 Serial Clock
+	FUNC_I2C1_SDA       FPIOAFunction = 129 // I2C1 Serial Data
+	FUNC_I2C2_SCLK      FPIOAFunction = 130 // I2C2 Serial Clock
+	FUNC_I2C2_SDA       FPIOAFunction = 131 // I2C2 Serial Data
+	FUNC_CMOS_XCLK      FPIOAFunction = 132 // DVP System Clock
+	FUNC_CMOS_RST       FPIOAFunction = 133 // DVP System Reset
+	FUNC_CMOS_PWDN      FPIOAFunction = 134 // DVP Power Down Mode
+	FUNC_CMOS_VSYNC     FPIOAFunction = 135 // DVP Vertical Sync
+	FUNC_CMOS_HREF      FPIOAFunction = 136 // DVP Horizontal Reference output
+	FUNC_CMOS_PCLK      FPIOAFunction = 137 // Pixel Clock
+	FUNC_CMOS_D0        FPIOAFunction = 138 // Data Bit 0
+	FUNC_CMOS_D1        FPIOAFunction = 139 // Data Bit 1
+	FUNC_CMOS_D2        FPIOAFunction = 140 // Data Bit 2
+	FUNC_CMOS_D3        FPIOAFunction = 141 // Data Bit 3
+	FUNC_CMOS_D4        FPIOAFunction = 142 // Data Bit 4
+	FUNC_CMOS_D5        FPIOAFunction = 143 // Data Bit 5
+	FUNC_CMOS_D6        FPIOAFunction = 144 // Data Bit 6
+	FUNC_CMOS_D7        FPIOAFunction = 145 // Data Bit 7
+	FUNC_SCCB_SCLK      FPIOAFunction = 146 // SCCB Serial Clock
+	FUNC_SCCB_SDA       FPIOAFunction = 147 // SCCB Serial Data
+	FUNC_UART1_CTS      FPIOAFunction = 148 // UART1 Clear To Send
+	FUNC_UART1_DSR      FPIOAFunction = 149 // UART1 Data Set Ready
+	FUNC_UART1_DCD      FPIOAFunction = 150 // UART1 Data Carrier Detect
+	FUNC_UART1_RI       FPIOAFunction = 151 // UART1 Ring Indicator
+	FUNC_UART1_SIR_IN   FPIOAFunction = 152 // UART1 Serial Infrared Input
+	FUNC_UART1_DTR      FPIOAFunction = 153 // UART1 Data Terminal Ready
+	FUNC_UART1_RTS      FPIOAFunction = 154 // UART1 Request To Send
+	FUNC_UART1_OUT2     FPIOAFunction = 155 // UART1 User-designated Output 2
+	FUNC_UART1_OUT1     FPIOAFunction = 156 // UART1 User-designated Output 1
+	FUNC_UART1_SIR_OUT  FPIOAFunction = 157 // UART1 Serial Infrared Output
+	FUNC_UART1_BAUD     FPIOAFunction = 158 // UART1 Transmit Clock Output
+	FUNC_UART1_RE       FPIOAFunction = 159 // UART1 Receiver Output Enable
+	FUNC_UART1_DE       FPIOAFunction = 160 // UART1 Driver Output Enable
+	FUNC_UART1_RS485_EN FPIOAFunction = 161 // UART1 RS485 Enable
+	FUNC_UART2_CTS      FPIOAFunction = 162 // UART2 Clear To Send
+	FUNC_UART2_DSR      FPIOAFunction = 163 // UART2 Data Set Ready
+	FUNC_UART2_DCD      FPIOAFunction = 164 // UART2 Data Carrier Detect
+	FUNC_UART2_RI       FPIOAFunction = 165 // UART2 Ring Indicator
+	FUNC_UART2_SIR_IN   FPIOAFunction = 166 // UART2 Serial Infrared Input
+	FUNC_UART2_DTR      FPIOAFunction = 167 // UART2 Data Terminal Ready
+	FUNC_UART2_RTS      FPIOAFunction = 168 // UART2 Request To Send
+	FUNC_UART2_OUT2     FPIOAFunction = 169 // UART2 User-designated Output 2
+	FUNC_UART2_OUT1     FPIOAFunction = 170 // UART2 User-designated Output 1
+	FUNC_UART2_SIR_OUT  FPIOAFunction = 171 // UART2 Serial Infrared Output
+	FUNC_UART2_BAUD     FPIOAFunction = 172 // UART2 Transmit Clock Output
+	FUNC_UART2_RE       FPIOAFunction = 173 // UART2 Receiver Output Enable
+	FUNC_UART2_DE       FPIOAFunction = 174 // UART2 Driver Output Enable
+	FUNC_UART2_RS485_EN FPIOAFunction = 175 // UART2 RS485 Enable
+	FUNC_UART3_CTS      FPIOAFunction = 176 // UART3 Clear To Send
+	FUNC_UART3_DSR      FPIOAFunction = 177 // UART3 Data Set Ready
+	FUNC_UART3_DCD      FPIOAFunction = 178 // UART3 Data Carrier Detect
+	FUNC_UART3_RI       FPIOAFunction = 179 // UART3 Ring Indicator
+	FUNC_UART3_SIR_IN   FPIOAFunction = 180 // UART3 Serial Infrared Input
+	FUNC_UART3_DTR      FPIOAFunction = 181 // UART3 Data Terminal Ready
+	FUNC_UART3_RTS      FPIOAFunction = 182 // UART3 Request To Send
+	FUNC_UART3_OUT2     FPIOAFunction = 183 // UART3 User-designated Output 2
+	FUNC_UART3_OUT1     FPIOAFunction = 184 // UART3 User-designated Output 1
+	FUNC_UART3_SIR_OUT  FPIOAFunction = 185 // UART3 Serial Infrared Output
+	FUNC_UART3_BAUD     FPIOAFunction = 186 // UART3 Transmit Clock Output
+	FUNC_UART3_RE       FPIOAFunction = 187 // UART3 Receiver Output Enable
+	FUNC_UART3_DE       FPIOAFunction = 188 // UART3 Driver Output Enable
+	FUNC_UART3_RS485_EN FPIOAFunction = 189 // UART3 RS485 Enable
+	FUNC_TIMER0_TOGGLE1 FPIOAFunction = 190 // TIMER0 Toggle Output 1
+	FUNC_TIMER0_TOGGLE2 FPIOAFunction = 191 // TIMER0 Toggle Output 2
+	FUNC_TIMER0_TOGGLE3 FPIOAFunction = 192 // TIMER0 Toggle Output 3
+	FUNC_TIMER0_TOGGLE4 FPIOAFunction = 193 // TIMER0 Toggle Output 4
+	FUNC_TIMER1_TOGGLE1 FPIOAFunction = 194 // TIMER1 Toggle Output 1
+	FUNC_TIMER1_TOGGLE2 FPIOAFunction = 195 // TIMER1 Toggle Output 2
+	FUNC_TIMER1_TOGGLE3 FPIOAFunction = 196 // TIMER1 Toggle Output 3
+	FUNC_TIMER1_TOGGLE4 FPIOAFunction = 197 // TIMER1 Toggle Output 4
+	FUNC_TIMER2_TOGGLE1 FPIOAFunction = 198 // TIMER2 Toggle Output 1
+	FUNC_TIMER2_TOGGLE2 FPIOAFunction = 199 // TIMER2 Toggle Output 2
+	FUNC_TIMER2_TOGGLE3 FPIOAFunction = 200 // TIMER2 Toggle Output 3
+	FUNC_TIMER2_TOGGLE4 FPIOAFunction = 201 // TIMER2 Toggle Output 4
+	FUNC_CLK_SPI2       FPIOAFunction = 202 // Clock SPI2
+	FUNC_CLK_I2C2       FPIOAFunction = 203 // Clock I2C2
+	FUNC_INTERNAL0      FPIOAFunction = 204 // Internal function signal 0
+	FUNC_INTERNAL1      FPIOAFunction = 205 // Internal function signal 1
+	FUNC_INTERNAL2      FPIOAFunction = 206 // Internal function signal 2
+	FUNC_INTERNAL3      FPIOAFunction = 207 // Internal function signal 3
+	FUNC_INTERNAL4      FPIOAFunction = 208 // Internal function signal 4
+	FUNC_INTERNAL5      FPIOAFunction = 209 // Internal function signal 5
+	FUNC_INTERNAL6      FPIOAFunction = 210 // Internal function signal 6
+	FUNC_INTERNAL7      FPIOAFunction = 211 // Internal function signal 7
+	FUNC_INTERNAL8      FPIOAFunction = 212 // Internal function signal 8
+	FUNC_INTERNAL9      FPIOAFunction = 213 // Internal function signal 9
+	FUNC_INTERNAL10     FPIOAFunction = 214 // Internal function signal 10
+	FUNC_INTERNAL11     FPIOAFunction = 215 // Internal function signal 11
+	FUNC_INTERNAL12     FPIOAFunction = 216 // Internal function signal 12
+	FUNC_INTERNAL13     FPIOAFunction = 217 // Internal function signal 13
+	FUNC_INTERNAL14     FPIOAFunction = 218 // Internal function signal 14
+	FUNC_INTERNAL15     FPIOAFunction = 219 // Internal function signal 15
+	FUNC_INTERNAL16     FPIOAFunction = 220 // Internal function signal 16
+	FUNC_INTERNAL17     FPIOAFunction = 221 // Internal function signal 17
+	FUNC_CONSTANT       FPIOAFunction = 222 // Constant function
+	FUNC_INTERNAL18     FPIOAFunction = 223 // Internal function signal 18
+	FUNC_DEBUG0         FPIOAFunction = 224 // Debug function 0
+	FUNC_DEBUG1         FPIOAFunction = 225 // Debug function 1
+	FUNC_DEBUG2         FPIOAFunction = 226 // Debug function 2
+	FUNC_DEBUG3         FPIOAFunction = 227 // Debug function 3
+	FUNC_DEBUG4         FPIOAFunction = 228 // Debug function 4
+	FUNC_DEBUG5         FPIOAFunction = 229 // Debug function 5
+	FUNC_DEBUG6         FPIOAFunction = 230 // Debug function 6
+	FUNC_DEBUG7         FPIOAFunction = 231 // Debug function 7
+	FUNC_DEBUG8         FPIOAFunction = 232 // Debug function 8
+	FUNC_DEBUG9         FPIOAFunction = 233 // Debug function 9
+	FUNC_DEBUG10        FPIOAFunction = 234 // Debug function 10
+	FUNC_DEBUG11        FPIOAFunction = 235 // Debug function 11
+	FUNC_DEBUG12        FPIOAFunction = 236 // Debug function 12
+	FUNC_DEBUG13        FPIOAFunction = 237 // Debug function 13
+	FUNC_DEBUG14        FPIOAFunction = 238 // Debug function 14
+	FUNC_DEBUG15        FPIOAFunction = 239 // Debug function 15
+	FUNC_DEBUG16        FPIOAFunction = 240 // Debug function 16
+	FUNC_DEBUG17        FPIOAFunction = 241 // Debug function 17
+	FUNC_DEBUG18        FPIOAFunction = 242 // Debug function 18
+	FUNC_DEBUG19        FPIOAFunction = 243 // Debug function 19
+	FUNC_DEBUG20        FPIOAFunction = 244 // Debug function 20
+	FUNC_DEBUG21        FPIOAFunction = 245 // Debug function 21
+	FUNC_DEBUG22        FPIOAFunction = 246 // Debug function 22
+	FUNC_DEBUG23        FPIOAFunction = 247 // Debug function 23
+	FUNC_DEBUG24        FPIOAFunction = 248 // Debug function 24
+	FUNC_DEBUG25        FPIOAFunction = 249 // Debug function 25
+	FUNC_DEBUG26        FPIOAFunction = 250 // Debug function 26
+	FUNC_DEBUG27        FPIOAFunction = 251 // Debug function 27
+	FUNC_DEBUG28        FPIOAFunction = 252 // Debug function 28
+	FUNC_DEBUG29        FPIOAFunction = 253 // Debug function 29
+	FUNC_DEBUG30        FPIOAFunction = 254 // Debug function 30
+	FUNC_DEBUG31        FPIOAFunction = 255 // Debug function 31
+)
+
+// These are the default FPIOA values for each function.
+// (source: https://github.com/kendryte/kendryte-standalone-sdk/blob/develop/lib/drivers/fpioa.c#L69)
+var fpioaFuncDefaults [256]uint32 = [256]uint32{
+	0x00900000, 0x00900001, 0x00900002, 0x00001f03, 0x00b03f04, 0x00b03f05, 0x00b03f06, 0x00b03f07, 0x00b03f08,
+	0x00b03f09, 0x00b03f0a, 0x00b03f0b, 0x00001f0c, 0x00001f0d, 0x00001f0e, 0x00001f0f, 0x03900010, 0x00001f11,
+	0x00900012, 0x00001f13, 0x00900014, 0x00900015, 0x00001f16, 0x00001f17, 0x00901f18, 0x00901f19, 0x00901f1a,
+	0x00901f1b, 0x00901f1c, 0x00901f1d, 0x00901f1e, 0x00901f1f, 0x00901f20, 0x00901f21, 0x00901f22, 0x00901f23,
+	0x00901f24, 0x00901f25, 0x00901f26, 0x00901f27, 0x00901f28, 0x00901f29, 0x00901f2a, 0x00901f2b, 0x00901f2c,
+	0x00901f2d, 0x00901f2e, 0x00901f2f, 0x00901f30, 0x00901f31, 0x00901f32, 0x00901f33, 0x00901f34, 0x00901f35,
+	0x00901f36, 0x00901f37, 0x00901f38, 0x00901f39, 0x00901f3a, 0x00901f3b, 0x00901f3c, 0x00901f3d, 0x00901f3e,
+	0x00901f3f, 0x00900040, 0x00001f41, 0x00900042, 0x00001f43, 0x00900044, 0x00001f45, 0x00b03f46, 0x00b03f47,
+	0x00b03f48, 0x00b03f49, 0x00b03f4a, 0x00b03f4b, 0x00b03f4c, 0x00b03f4d, 0x00001f4e, 0x00001f4f, 0x00001f50,
+	0x00001f51, 0x03900052, 0x00001f53, 0x00b03f54, 0x00900055, 0x00900056, 0x00001f57, 0x00001f58, 0x00001f59,
+	0x0090005a, 0x0090005b, 0x0090005c, 0x0090005d, 0x00001f5e, 0x00001f5f, 0x00001f60, 0x00001f61, 0x00001f62,
+	0x00001f63, 0x00001f64, 0x00900065, 0x00900066, 0x00900067, 0x00900068, 0x00001f69, 0x00001f6a, 0x00001f6b,
+	0x00001f6c, 0x00001f6d, 0x00001f6e, 0x00001f6f, 0x00900070, 0x00900071, 0x00900072, 0x00900073, 0x00001f74,
+	0x00001f75, 0x00001f76, 0x00001f77, 0x00000078, 0x00000079, 0x0000007a, 0x0000007b, 0x0000007c, 0x0000007d,
+	0x0099107e, 0x0099107f, 0x00991080, 0x00991081, 0x00991082, 0x00991083, 0x00001f84, 0x00001f85, 0x00001f86,
+	0x00900087, 0x00900088, 0x00900089, 0x0090008a, 0x0090008b, 0x0090008c, 0x0090008d, 0x0090008e, 0x0090008f,
+	0x00900090, 0x00900091, 0x00993092, 0x00993093, 0x00900094, 0x00900095, 0x00900096, 0x00900097, 0x00900098,
+	0x00001f99, 0x00001f9a, 0x00001f9b, 0x00001f9c, 0x00001f9d, 0x00001f9e, 0x00001f9f, 0x00001fa0, 0x00001fa1,
+	0x009000a2, 0x009000a3, 0x009000a4, 0x009000a5, 0x009000a6, 0x00001fa7, 0x00001fa8, 0x00001fa9, 0x00001faa,
+	0x00001fab, 0x00001fac, 0x00001fad, 0x00001fae, 0x00001faf, 0x009000b0, 0x009000b1, 0x009000b2, 0x009000b3,
+	0x009000b4, 0x00001fb5, 0x00001fb6, 0x00001fb7, 0x00001fb8, 0x00001fb9, 0x00001fba, 0x00001fbb, 0x00001fbc,
+	0x00001fbd, 0x00001fbe, 0x00001fbf, 0x00001fc0, 0x00001fc1, 0x00001fc2, 0x00001fc3, 0x00001fc4, 0x00001fc5,
+	0x00001fc6, 0x00001fc7, 0x00001fc8, 0x00001fc9, 0x00001fca, 0x00001fcb, 0x00001fcc, 0x00001fcd, 0x00001fce,
+	0x00001fcf, 0x00001fd0, 0x00001fd1, 0x00001fd2, 0x00001fd3, 0x00001fd4, 0x009000d5, 0x009000d6, 0x009000d7,
+	0x009000d8, 0x009100d9, 0x00991fda, 0x009000db, 0x009000dc, 0x009000dd, 0x000000de, 0x009000df, 0x00001fe0,
+	0x00001fe1, 0x00001fe2, 0x00001fe3, 0x00001fe4, 0x00001fe5, 0x00001fe6, 0x00001fe7, 0x00001fe8, 0x00001fe9,
+	0x00001fea, 0x00001feb, 0x00001fec, 0x00001fed, 0x00001fee, 0x00001fef, 0x00001ff0, 0x00001ff1, 0x00001ff2,
+	0x00001ff3, 0x00001ff4, 0x00001ff5, 0x00001ff6, 0x00001ff7, 0x00001ff8, 0x00001ff9, 0x00001ffa, 0x00001ffb,
+	0x00001ffc, 0x00001ffd, 0x00001ffe, 0x00001fff,
+}