// Copyright 2016 The Periph Authors. All rights reserved. // Use of this source code is governed under the Apache License, Version 2.0 // that can be found in the LICENSE file. // Raspberry Pi pin out. package rpi import ( "errors" "fmt" "os" "periph.io/x/periph" "periph.io/x/periph/conn/gpio" "periph.io/x/periph/conn/pin" "periph.io/x/periph/conn/pin/pinreg" "periph.io/x/periph/host/bcm283x" "periph.io/x/periph/host/distro" ) // Present returns true if running on a Raspberry Pi board. // // https://www.raspberrypi.org/ func Present() bool { if isArm { // This is iffy at best. _, err := os.Stat("/sys/bus/platform/drivers/raspberrypi-firmware") return err == nil } return false } // Pin as connect on the 40 pins extension header. // // Schematics are useful to know what is connected to what: // https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/README.md // // The actual pin mapping depends on the board revision! The default values are // set as the 40 pins header on Raspberry Pi 2 and Raspberry Pi 3. // // Some header info here: http://elinux.org/RPi_Low-level_peripherals // // P1 is also known as J8 on A+, B+, 2 and later. var ( // Raspberry Pi A and B, 26 pin header: P1_1 pin.Pin = pin.V3_3 // max 30mA P1_2 pin.Pin = pin.V5 // (filtered) P1_3 gpio.PinIO = bcm283x.GPIO2 // High, I2C1_SDA P1_4 pin.Pin = pin.V5 // P1_5 gpio.PinIO = bcm283x.GPIO3 // High, I2C1_SCL P1_6 pin.Pin = pin.GROUND // P1_7 gpio.PinIO = bcm283x.GPIO4 // High, CLK0 P1_8 gpio.PinIO = bcm283x.GPIO14 // Low, UART0_TX, UART1_TX P1_9 pin.Pin = pin.GROUND // P1_10 gpio.PinIO = bcm283x.GPIO15 // Low, UART0_RX, UART1_RX P1_11 gpio.PinIO = bcm283x.GPIO17 // Low, UART0_RTS, SPI1_CS1, UART1_RTS P1_12 gpio.PinIO = bcm283x.GPIO18 // Low, I2S_SCK, SPI1_CS0, PWM0 P1_13 gpio.PinIO = bcm283x.GPIO27 // Low, P1_14 pin.Pin = pin.GROUND // P1_15 gpio.PinIO = bcm283x.GPIO22 // Low, P1_16 gpio.PinIO = bcm283x.GPIO23 // Low, P1_17 pin.Pin = pin.V3_3 // P1_18 gpio.PinIO = bcm283x.GPIO24 // Low, P1_19 gpio.PinIO = bcm283x.GPIO10 // Low, SPI0_MOSI P1_20 pin.Pin = pin.GROUND // P1_21 gpio.PinIO = bcm283x.GPIO9 // Low, SPI0_MISO P1_22 gpio.PinIO = bcm283x.GPIO25 // Low, P1_23 gpio.PinIO = bcm283x.GPIO11 // Low, SPI0_CLK P1_24 gpio.PinIO = bcm283x.GPIO8 // High, SPI0_CS0 P1_25 pin.Pin = pin.GROUND // P1_26 gpio.PinIO = bcm283x.GPIO7 // High, SPI0_CS1 // Raspberry Pi A+, B+, 2 and later, 40 pin header (also named J8): P1_27 gpio.PinIO = bcm283x.GPIO0 // High, I2C0_SDA used to probe for HAT EEPROM, see https://github.com/raspberrypi/hats P1_28 gpio.PinIO = bcm283x.GPIO1 // High, I2C0_SCL P1_29 gpio.PinIO = bcm283x.GPIO5 // High, CLK1 P1_30 pin.Pin = pin.GROUND // P1_31 gpio.PinIO = bcm283x.GPIO6 // High, CLK2 P1_32 gpio.PinIO = bcm283x.GPIO12 // Low, PWM0 P1_33 gpio.PinIO = bcm283x.GPIO13 // Low, PWM1 P1_34 pin.Pin = pin.GROUND // P1_35 gpio.PinIO = bcm283x.GPIO19 // Low, I2S_WS, SPI1_MISO, PWM1 P1_36 gpio.PinIO = bcm283x.GPIO16 // Low, UART0_CTS, SPI1_CS2, UART1_CTS P1_37 gpio.PinIO = bcm283x.GPIO26 // P1_38 gpio.PinIO = bcm283x.GPIO20 // Low, I2S_DIN, SPI1_MOSI, CLK0 P1_39 pin.Pin = pin.GROUND // P1_40 gpio.PinIO = bcm283x.GPIO21 // Low, I2S_DOUT, SPI1_CLK, CLK1 // P5 header on Raspberry Pi A and B, PCB v2: P5_1 pin.Pin = pin.V5 P5_2 pin.Pin = pin.V3_3 P5_3 gpio.PinIO = bcm283x.GPIO28 // Float, I2C0_SDA, I2S_SCK P5_4 gpio.PinIO = bcm283x.GPIO29 // Float, I2C0_SCL, I2S_WS P5_5 gpio.PinIO = bcm283x.GPIO30 // Low, I2S_DIN, UART0_CTS, UART1_CTS P5_6 gpio.PinIO = bcm283x.GPIO31 // Low, I2S_DOUT, UART0_RTS, UART1_RTS P5_7 pin.Pin = pin.GROUND P5_8 pin.Pin = pin.GROUND AUDIO_RIGHT = bcm283x.GPIO40 // Low, PWM0, SPI2_MISO, UART1_TX AUDIO_LEFT = bcm283x.GPIO41 // Low, PWM1, SPI2_MOSI, UART1_RX HDMI_HOTPLUG_DETECT = bcm283x.GPIO46 // High, ) // Pin as connected on the SODIMM header. // // Documentation is https://www.raspberrypi.org/documentation/hardware/computemodule/datasheets/rpi_DATA_CM_1p0.pdf // // There are some differences for CM3-Lite and CM1. var ( SO_1 pin.Pin = pin.GROUND // GND SO_2 pin.Pin = pin.INVALID // EMMC_DISABLE_N SO_3 gpio.PinIO = bcm283x.GPIO0 // GPIO0 SO_4 pin.Pin = pin.INVALID // NC, SDX_VDD, NC SO_5 gpio.PinIO = bcm283x.GPIO1 // GPIO1 SO_6 pin.Pin = pin.INVALID // NC, SDX_VDD, NC SO_7 pin.Pin = pin.GROUND // GND SO_8 pin.Pin = pin.GROUND // GND SO_9 gpio.PinIO = bcm283x.GPIO2 // GPIO2 SO_10 pin.Pin = pin.INVALID // NC, SDX_CLK, NC SO_11 gpio.PinIO = bcm283x.GPIO3 // GPIO3 SO_12 pin.Pin = pin.INVALID // NC, SDX_CMD, NC SO_13 pin.Pin = pin.GROUND // GND SO_14 pin.Pin = pin.GROUND // GND SO_15 gpio.PinIO = bcm283x.GPIO4 // GPIO4 SO_16 pin.Pin = pin.INVALID // NC, SDX_D0, NC SO_17 gpio.PinIO = bcm283x.GPIO5 // GPIO5 SO_18 pin.Pin = pin.INVALID // NC, SDX_D1, NC SO_19 pin.Pin = pin.GROUND // GND SO_20 pin.Pin = pin.GROUND // GND SO_21 gpio.PinIO = bcm283x.GPIO6 // GPIO6 SO_22 pin.Pin = pin.INVALID // NC, SDX_D2, NC SO_23 gpio.PinIO = bcm283x.GPIO7 // GPIO7 SO_24 pin.Pin = pin.INVALID // NC, SDX_D3, NC SO_25 pin.Pin = pin.GROUND // GND SO_26 pin.Pin = pin.GROUND // GND SO_27 gpio.PinIO = bcm283x.GPIO8 // GPIO8 SO_28 gpio.PinIO = bcm283x.GPIO28 // GPIO28 SO_29 gpio.PinIO = bcm283x.GPIO9 // GPIO9 SO_30 gpio.PinIO = bcm283x.GPIO29 // GPIO29 SO_31 pin.Pin = pin.GROUND // GND SO_32 pin.Pin = pin.GROUND // GND SO_33 gpio.PinIO = bcm283x.GPIO10 // GPIO10 SO_34 gpio.PinIO = bcm283x.GPIO30 // GPIO30 SO_35 gpio.PinIO = bcm283x.GPIO11 // GPIO11 SO_36 gpio.PinIO = bcm283x.GPIO31 // GPIO31 SO_37 pin.Pin = pin.GROUND // GND SO_38 pin.Pin = pin.GROUND // GND SO_39 pin.Pin = pin.DC_IN // GPIO0-27_VDD SO_40 pin.Pin = pin.DC_IN // GPIO0-27_VDD SO_41 pin.Pin = pin.DC_IN // GPIO28-45_VDD SO_42 pin.Pin = pin.DC_IN // GPIO28-45_VDD SO_43 pin.Pin = pin.GROUND // GND SO_44 pin.Pin = pin.GROUND // GND SO_45 gpio.PinIO = bcm283x.GPIO12 // GPIO12 SO_46 gpio.PinIO = bcm283x.GPIO32 // GPIO32 SO_47 gpio.PinIO = bcm283x.GPIO13 // GPIO13 SO_48 gpio.PinIO = bcm283x.GPIO33 // GPIO33 SO_49 pin.Pin = pin.GROUND // GND SO_50 pin.Pin = pin.GROUND // GND SO_51 gpio.PinIO = bcm283x.GPIO14 // GPIO14 SO_52 gpio.PinIO = bcm283x.GPIO34 // GPIO34 SO_53 gpio.PinIO = bcm283x.GPIO15 // GPIO15 SO_54 gpio.PinIO = bcm283x.GPIO35 // GPIO35 SO_55 pin.Pin = pin.GROUND // GND SO_56 pin.Pin = pin.GROUND // GND SO_57 gpio.PinIO = bcm283x.GPIO16 // GPIO16 SO_58 gpio.PinIO = bcm283x.GPIO36 // GPIO36 SO_59 gpio.PinIO = bcm283x.GPIO17 // GPIO17 SO_60 gpio.PinIO = bcm283x.GPIO37 // GPIO37 SO_61 pin.Pin = pin.GROUND // GND SO_62 pin.Pin = pin.GROUND // GND SO_63 gpio.PinIO = bcm283x.GPIO18 // GPIO18 SO_64 gpio.PinIO = bcm283x.GPIO38 // GPIO38 SO_65 gpio.PinIO = bcm283x.GPIO19 // GPIO19 SO_66 gpio.PinIO = bcm283x.GPIO39 // GPIO39 SO_67 pin.Pin = pin.GROUND // GND SO_68 pin.Pin = pin.GROUND // GND SO_69 gpio.PinIO = bcm283x.GPIO20 // GPIO20 SO_70 gpio.PinIO = bcm283x.GPIO40 // GPIO40 SO_71 gpio.PinIO = bcm283x.GPIO21 // GPIO21 SO_72 gpio.PinIO = bcm283x.GPIO41 // GPIO41 SO_73 pin.Pin = pin.GROUND // GND SO_74 pin.Pin = pin.GROUND // GND SO_75 gpio.PinIO = bcm283x.GPIO22 // GPIO22 SO_76 gpio.PinIO = bcm283x.GPIO42 // GPIO42 SO_77 gpio.PinIO = bcm283x.GPIO23 // GPIO23 SO_78 gpio.PinIO = bcm283x.GPIO43 // GPIO43 SO_79 pin.Pin = pin.GROUND // GND SO_80 pin.Pin = pin.GROUND // GND SO_81 gpio.PinIO = bcm283x.GPIO24 // GPIO24 SO_82 gpio.PinIO = bcm283x.GPIO44 // GPIO44 SO_83 gpio.PinIO = bcm283x.GPIO25 // GPIO25 SO_84 gpio.PinIO = bcm283x.GPIO45 // GPIO45 SO_85 pin.Pin = pin.GROUND // GND SO_86 pin.Pin = pin.GROUND // GND SO_87 gpio.PinIO = bcm283x.GPIO26 // GPIO26 SO_88 pin.Pin = pin.INVALID // HDMI_HPD_N_1V8, HDMI_HPD_N_1V8, GPIO46_1V8 SO_89 gpio.PinIO = bcm283x.GPIO27 // GPIO27 SO_90 pin.Pin = pin.INVALID // EMMC_EN_N_1V8, EMMC_EN_N_1V8, GPIO47_1V8 SO_91 pin.Pin = pin.GROUND // GND SO_92 pin.Pin = pin.GROUND // GND SO_93 pin.Pin = pin.INVALID // DSI0_DN1 SO_94 pin.Pin = pin.INVALID // DSI1_DP0 SO_95 pin.Pin = pin.INVALID // DSI0_DP1 SO_96 pin.Pin = pin.INVALID // DSI1_DN0 SO_97 pin.Pin = pin.GROUND // GND SO_98 pin.Pin = pin.GROUND // GND SO_99 pin.Pin = pin.INVALID // DSI0_DN0 SO_100 pin.Pin = pin.INVALID // DSI1_CP SO_101 pin.Pin = pin.INVALID // DSI0_DP0 SO_102 pin.Pin = pin.INVALID // DSI1_CN SO_103 pin.Pin = pin.GROUND // GND SO_104 pin.Pin = pin.GROUND // GND SO_105 pin.Pin = pin.INVALID // DSI0_CN SO_106 pin.Pin = pin.INVALID // DSI1_DP3 SO_107 pin.Pin = pin.INVALID // DSI0_CP SO_108 pin.Pin = pin.INVALID // DSI1_DN3 SO_109 pin.Pin = pin.GROUND // GND SO_110 pin.Pin = pin.GROUND // GND SO_111 pin.Pin = pin.INVALID // HDMI_CLK_N SO_112 pin.Pin = pin.INVALID // DSI1_DP2 SO_113 pin.Pin = pin.INVALID // HDMI_CLK_P SO_114 pin.Pin = pin.INVALID // DSI1_DN2 SO_115 pin.Pin = pin.GROUND // GND SO_116 pin.Pin = pin.GROUND // GND SO_117 pin.Pin = pin.INVALID // HDMI_D0_N SO_118 pin.Pin = pin.INVALID // DSI1_DP1 SO_119 pin.Pin = pin.INVALID // HDMI_D0_P SO_120 pin.Pin = pin.INVALID // DSI1_DN1 SO_121 pin.Pin = pin.GROUND // GND SO_122 pin.Pin = pin.GROUND // GND SO_123 pin.Pin = pin.INVALID // HDMI_D1_N SO_124 pin.Pin = pin.INVALID // NC SO_125 pin.Pin = pin.INVALID // HDMI_D1_P SO_126 pin.Pin = pin.INVALID // NC SO_127 pin.Pin = pin.GROUND // GND SO_128 pin.Pin = pin.INVALID // NC SO_129 pin.Pin = pin.INVALID // HDMI_D2_N SO_130 pin.Pin = pin.INVALID // NC SO_131 pin.Pin = pin.INVALID // HDMI_D2_P SO_132 pin.Pin = pin.INVALID // NC SO_133 pin.Pin = pin.GROUND // GND SO_134 pin.Pin = pin.GROUND // GND SO_135 pin.Pin = pin.INVALID // CAM1_DP3 SO_136 pin.Pin = pin.INVALID // CAM0_DP0 SO_137 pin.Pin = pin.INVALID // CAM1_DN3 SO_138 pin.Pin = pin.INVALID // CAM0_DN0 SO_139 pin.Pin = pin.GROUND // GND SO_140 pin.Pin = pin.GROUND // GND SO_141 pin.Pin = pin.INVALID // CAM1_DP2 SO_142 pin.Pin = pin.INVALID // CAM0_CP SO_143 pin.Pin = pin.INVALID // CAM1_DN2 SO_144 pin.Pin = pin.INVALID // CAM0_CN SO_145 pin.Pin = pin.GROUND // GND SO_146 pin.Pin = pin.GROUND // GND SO_147 pin.Pin = pin.INVALID // CAM1_CP SO_148 pin.Pin = pin.INVALID // CAM0_DP1 SO_149 pin.Pin = pin.INVALID // CAM1_CN SO_150 pin.Pin = pin.INVALID // CAM0_DN1 SO_151 pin.Pin = pin.GROUND // GND SO_152 pin.Pin = pin.GROUND // GND SO_153 pin.Pin = pin.INVALID // CAM1_DP1 SO_154 pin.Pin = pin.INVALID // NC SO_155 pin.Pin = pin.INVALID // CAM1_DN1 SO_156 pin.Pin = pin.INVALID // NC SO_157 pin.Pin = pin.GROUND // GND SO_158 pin.Pin = pin.INVALID // NC SO_159 pin.Pin = pin.INVALID // CAM1_DP0 SO_160 pin.Pin = pin.INVALID // NC SO_161 pin.Pin = pin.INVALID // CAM1_DN0 SO_162 pin.Pin = pin.INVALID // NC SO_163 pin.Pin = pin.GROUND // GND SO_164 pin.Pin = pin.GROUND // GND SO_165 pin.Pin = pin.INVALID // USB_DP SO_166 pin.Pin = pin.INVALID // TVDAC SO_167 pin.Pin = pin.INVALID // USB_DM SO_168 pin.Pin = pin.INVALID // USB_OTGID SO_169 pin.Pin = pin.GROUND // GND SO_170 pin.Pin = pin.GROUND // GND SO_171 pin.Pin = pin.INVALID // HDMI_CEC SO_172 pin.Pin = pin.INVALID // VC_TRST_N SO_173 pin.Pin = pin.INVALID // HDMI_SDA SO_174 pin.Pin = pin.INVALID // VC_TDI SO_175 pin.Pin = pin.INVALID // HDMI_SCL SO_176 pin.Pin = pin.INVALID // VC_TMS SO_177 pin.Pin = pin.INVALID // RUN SO_178 pin.Pin = pin.INVALID // VC_TDO SO_179 pin.Pin = pin.INVALID // VDD_CORE (DO NOT CONNECT) SO_180 pin.Pin = pin.INVALID // VC_TCK SO_181 pin.Pin = pin.GROUND // GND SO_182 pin.Pin = pin.GROUND // GND SO_183 pin.Pin = pin.V1_8 // 1V8 SO_184 pin.Pin = pin.V1_8 // 1V8 SO_185 pin.Pin = pin.V1_8 // 1V8 SO_186 pin.Pin = pin.V1_8 // 1V8 SO_187 pin.Pin = pin.GROUND // GND SO_188 pin.Pin = pin.GROUND // GND SO_189 pin.Pin = pin.DC_IN // VDAC SO_190 pin.Pin = pin.DC_IN // VDAC SO_191 pin.Pin = pin.V3_3 // 3V3 SO_192 pin.Pin = pin.V3_3 // 3V3 SO_193 pin.Pin = pin.V3_3 // 3V3 SO_194 pin.Pin = pin.V3_3 // 3V3 SO_195 pin.Pin = pin.GROUND // GND SO_196 pin.Pin = pin.GROUND // GND SO_197 pin.Pin = pin.DC_IN // VBAT SO_198 pin.Pin = pin.DC_IN // VBAT SO_199 pin.Pin = pin.DC_IN // VBAT SO_200 pin.Pin = pin.DC_IN // VBAT ) // // revisionCode processes the CPU revision code based on documentation at // https://www.raspberrypi.org/documentation/hardware/raspberrypi/revision-codes/README.md // // Format is: uuuuuuuuFMMMCCCCPPPPTTTTTTTTRRRR // 2 2 1 1 0 0 // 3 0 6 2 4 0 type revisionCode uint32 // parseRevision processes the old style revision codes to new style bitpacked // format. func parseRevision(v uint32) (revisionCode, error) { w := revisionCode(v) & warrantyVoid switch v &^ uint32(warrantyVoid) { case 0x2, 0x3: return w | newFormat | memory256MB | egoman | bcm2835 | board1B, nil case 0x4: return w | newFormat | memory256MB | sonyUK | bcm2835 | board1B | 2, nil // v2.0 case 0x5: return w | newFormat | memory256MB | bcm2835 | board1B | 2, nil // v2.0 Qisda case 0x6: return w | newFormat | memory256MB | egoman | bcm2835 | board1B | 2, nil // v2.0 case 0x7: return w | newFormat | memory256MB | egoman | bcm2835 | board1A | 2, nil // v2.0 case 0x8: return w | newFormat | memory256MB | sonyUK | bcm2835 | board1A | 2, nil // v2.0 case 0x9: return w | newFormat | memory256MB | bcm2835 | board1A | 2, nil // v2.0 Qisda case 0xd: return w | newFormat | memory512MB | egoman | bcm2835 | board1B | 2, nil // v2.0 case 0xe: return w | newFormat | memory512MB | sonyUK | bcm2835 | board1B | 2, nil // v2.0 case 0xf: return w | newFormat | memory512MB | egoman | bcm2835 | board1B | 2, nil // v2.0 case 0x10: return w | newFormat | memory512MB | sonyUK | bcm2835 | board1BPlus | 2, nil // v1.2 case 0x11: return w | newFormat | memory512MB | sonyUK | bcm2835 | boardCM1, nil case 0x12: return w | newFormat | memory256MB | sonyUK | bcm2835 | board1APlus | 1, nil // v1.1 case 0x13: return w | newFormat | memory512MB | embest | bcm2835 | board1BPlus | 2, nil // v1.2 case 0x14: return w | newFormat | memory512MB | embest | bcm2835 | boardCM1, nil case 0x15: // Can be either 256MB or 512MB. return w | newFormat | memory256MB | embest | bcm2835 | board1APlus | 1, nil // v1.1 default: if v&uint32(newFormat) == 0 { return 0, fmt.Errorf("rpi: unknown hardware version: 0x%x", v) } return revisionCode(v), nil } } const ( warrantyVoid revisionCode = 1 << 24 newFormat revisionCode = 1 << 23 memoryShift = 20 memoryMask revisionCode = 0x7 << memoryShift manufacturerShift = 16 manufacturerMask revisionCode = 0xf << manufacturerShift processorShift = 12 processorMask revisionCode = 0xf << processorShift boardShift = 4 boardMask revisionCode = 0xff << boardShift revisionMask revisionCode = 0xf << 0 memory256MB revisionCode = 0 << memoryShift memory512MB revisionCode = 1 << memoryShift memory1GB revisionCode = 2 << memoryShift memory2GB revisionCode = 3 << memoryShift memory4GB revisionCode = 4 << memoryShift sonyUK revisionCode = 0 << manufacturerShift egoman revisionCode = 1 << manufacturerShift embest revisionCode = 2 << manufacturerShift sonyJapan revisionCode = 3 << manufacturerShift embest2 revisionCode = 4 << manufacturerShift stadium revisionCode = 5 << manufacturerShift bcm2835 revisionCode = 0 << processorShift bcm2836 revisionCode = 1 << processorShift bcm2837 revisionCode = 2 << processorShift bcm2711 revisionCode = 3 << processorShift board1A revisionCode = 0x0 << boardShift board1B revisionCode = 0x1 << boardShift board1APlus revisionCode = 0x2 << boardShift board1BPlus revisionCode = 0x3 << boardShift board2B revisionCode = 0x4 << boardShift boardAlpha revisionCode = 0x5 << boardShift boardCM1 revisionCode = 0x6 << boardShift board3B revisionCode = 0x8 << boardShift boardZero revisionCode = 0x9 << boardShift boardCM3 revisionCode = 0xa << boardShift boardZeroW revisionCode = 0xc << boardShift board3BPlus revisionCode = 0xd << boardShift board3APlus revisionCode = 0xe << boardShift boardReserved revisionCode = 0xf << boardShift boardCM3Plus revisionCode = 0x10 << boardShift board4B revisionCode = 0x11 << boardShift ) // features represents the different features on various Raspberry Pi boards. // // See https://github.com/raspberrypi/firmware/blob/master/extra/dt-blob.dts // for the official mapping. type features struct { hdrP1P26 bool // P1 has 26 pins hdrP1P40 bool // P1 has 40 pins hdrP5 bool // P5 is present hdrAudio bool // Audio header is present audioLeft41 bool // AUDIO_LEFT uses GPIO41 (RPi3 and later) instead of GPIO45 (old boards) hdrHDMI bool // At least one HDMI port is present hdrSODIMM bool // SODIMM port is present } func (f *features) init(v uint32) error { r, err := parseRevision(v) if err != nil { return err } // Ignore the overclock bit. r &^= warrantyVoid switch r & boardMask { case board1A: f.hdrP1P26 = true f.hdrAudio = true // Only the v2 PCB has the P5 header. if r&revisionMask == 2 { f.hdrP5 = true f.hdrHDMI = true } case board1B: f.hdrP1P26 = true f.hdrAudio = true // Only the v2 PCB has the P5 header. if r&revisionMask == 2 { f.hdrP5 = true f.hdrHDMI = true } case board1APlus: f.hdrP1P40 = true f.hdrAudio = true f.hdrHDMI = true case board1BPlus: f.hdrP1P40 = true f.hdrAudio = true f.hdrHDMI = true case board2B: f.hdrP1P40 = true f.hdrAudio = true f.hdrHDMI = true case boardAlpha: case boardCM1: // TODO: define CM1 SODIMM header if anyone ever needs it. Please file an // issue at https://github.com/google/periph/issues/new/choose case board3B: f.hdrP1P40 = true f.hdrAudio = true f.audioLeft41 = true f.hdrHDMI = true case boardZero: f.hdrP1P40 = true f.hdrHDMI = true case boardCM3: // Tell CM3 and CM3-Lite apart, if possible. f.hdrSODIMM = true case boardZeroW: f.hdrP1P40 = true f.hdrHDMI = true case board3BPlus: f.hdrP1P40 = true f.hdrAudio = true f.audioLeft41 = true f.hdrHDMI = true case board3APlus: f.hdrP1P40 = true f.hdrAudio = true f.audioLeft41 = true f.hdrHDMI = true case boardReserved: case boardCM3Plus: // Tell CM3 and CM3-Lite apart, if possible. f.hdrSODIMM = true case board4B: f.hdrP1P40 = true f.hdrAudio = true f.audioLeft41 = true f.hdrHDMI = true default: return fmt.Errorf("rpi: unknown hardware version: 0x%x", r) } return nil } // registerHeaders registers the headers for this board and fixes the GPIO // global variables. func (f *features) registerHeaders() error { if f.hdrP1P26 { if err := pinreg.Register("P1", [][]pin.Pin{ {P1_1, P1_2}, {P1_3, P1_4}, {P1_5, P1_6}, {P1_7, P1_8}, {P1_9, P1_10}, {P1_11, P1_12}, {P1_13, P1_14}, {P1_15, P1_16}, {P1_17, P1_18}, {P1_19, P1_20}, {P1_21, P1_22}, {P1_23, P1_24}, {P1_25, P1_26}, }); err != nil { return err } // TODO(maruel): Models from 2012 and earlier have P1_3=GPIO0, P1_5=GPIO1 and P1_13=GPIO21. // P2 and P3 are not useful. // P6 has a RUN pin for reset but it's not available after Pi version 1. P1_27 = gpio.INVALID P1_28 = gpio.INVALID P1_29 = gpio.INVALID P1_30 = pin.INVALID P1_31 = gpio.INVALID P1_32 = gpio.INVALID P1_33 = gpio.INVALID P1_34 = pin.INVALID P1_35 = gpio.INVALID P1_36 = gpio.INVALID P1_37 = gpio.INVALID P1_38 = gpio.INVALID P1_39 = pin.INVALID P1_40 = gpio.INVALID } else if f.hdrP1P40 { if err := pinreg.Register("P1", [][]pin.Pin{ {P1_1, P1_2}, {P1_3, P1_4}, {P1_5, P1_6}, {P1_7, P1_8}, {P1_9, P1_10}, {P1_11, P1_12}, {P1_13, P1_14}, {P1_15, P1_16}, {P1_17, P1_18}, {P1_19, P1_20}, {P1_21, P1_22}, {P1_23, P1_24}, {P1_25, P1_26}, {P1_27, P1_28}, {P1_29, P1_30}, {P1_31, P1_32}, {P1_33, P1_34}, {P1_35, P1_36}, {P1_37, P1_38}, {P1_39, P1_40}, }); err != nil { return err } } else { P1_1 = pin.INVALID P1_2 = pin.INVALID P1_3 = gpio.INVALID P1_4 = pin.INVALID P1_5 = gpio.INVALID P1_6 = pin.INVALID P1_7 = gpio.INVALID P1_8 = gpio.INVALID P1_9 = pin.INVALID P1_10 = gpio.INVALID P1_11 = gpio.INVALID P1_12 = gpio.INVALID P1_13 = gpio.INVALID P1_14 = pin.INVALID P1_15 = gpio.INVALID P1_16 = gpio.INVALID P1_17 = pin.INVALID P1_18 = gpio.INVALID P1_19 = gpio.INVALID P1_20 = pin.INVALID P1_21 = gpio.INVALID P1_22 = gpio.INVALID P1_23 = gpio.INVALID P1_24 = gpio.INVALID P1_25 = pin.INVALID P1_26 = gpio.INVALID P1_27 = gpio.INVALID P1_28 = gpio.INVALID P1_29 = gpio.INVALID P1_30 = pin.INVALID P1_31 = gpio.INVALID P1_32 = gpio.INVALID P1_33 = gpio.INVALID P1_34 = pin.INVALID P1_35 = gpio.INVALID P1_36 = gpio.INVALID P1_37 = gpio.INVALID P1_38 = gpio.INVALID P1_39 = pin.INVALID P1_40 = gpio.INVALID } // Only the A and B v2 PCB has the P5 header. if f.hdrP5 { if err := pinreg.Register("P5", [][]pin.Pin{ {P5_1, P5_2}, {P5_3, P5_4}, {P5_5, P5_6}, {P5_7, P5_8}, }); err != nil { return err } } else { P5_1 = pin.INVALID P5_2 = pin.INVALID P5_3 = gpio.INVALID P5_4 = gpio.INVALID P5_5 = gpio.INVALID P5_6 = gpio.INVALID P5_7 = pin.INVALID P5_8 = pin.INVALID } if f.hdrSODIMM { if err := pinreg.Register("SO", [][]pin.Pin{ {SO_1, SO_2}, {SO_3, SO_4}, {SO_5, SO_6}, {SO_7, SO_8}, {SO_9, SO_10}, {SO_11, SO_12}, {SO_13, SO_14}, {SO_15, SO_16}, {SO_17, SO_18}, {SO_19, SO_20}, {SO_21, SO_22}, {SO_23, SO_24}, {SO_25, SO_26}, {SO_27, SO_28}, {SO_29, SO_30}, {SO_31, SO_32}, {SO_33, SO_34}, {SO_35, SO_36}, {SO_37, SO_38}, {SO_39, SO_40}, {SO_41, SO_42}, {SO_43, SO_44}, {SO_45, SO_46}, {SO_47, SO_48}, {SO_49, SO_50}, {SO_51, SO_52}, {SO_53, SO_54}, {SO_55, SO_56}, {SO_57, SO_58}, {SO_59, SO_60}, {SO_61, SO_62}, {SO_63, SO_64}, {SO_65, SO_66}, {SO_67, SO_68}, {SO_69, SO_70}, {SO_71, SO_72}, {SO_73, SO_74}, {SO_75, SO_76}, {SO_77, SO_78}, {SO_79, SO_80}, {SO_81, SO_82}, {SO_83, SO_84}, {SO_85, SO_86}, {SO_87, SO_88}, {SO_89, SO_90}, {SO_91, SO_92}, {SO_93, SO_94}, {SO_95, SO_96}, {SO_97, SO_98}, {SO_99, SO_100}, {SO_101, SO_102}, {SO_103, SO_104}, {SO_105, SO_106}, {SO_107, SO_108}, {SO_109, SO_110}, {SO_111, SO_112}, {SO_113, SO_114}, {SO_115, SO_116}, {SO_117, SO_118}, {SO_119, SO_120}, {SO_121, SO_122}, {SO_123, SO_124}, {SO_125, SO_126}, {SO_127, SO_128}, {SO_129, SO_130}, {SO_131, SO_132}, {SO_133, SO_134}, {SO_135, SO_136}, {SO_137, SO_138}, {SO_139, SO_140}, {SO_141, SO_142}, {SO_143, SO_144}, {SO_145, SO_146}, {SO_147, SO_148}, {SO_149, SO_150}, {SO_151, SO_152}, {SO_153, SO_154}, {SO_155, SO_156}, {SO_157, SO_158}, {SO_159, SO_160}, {SO_161, SO_162}, {SO_163, SO_164}, {SO_165, SO_166}, {SO_167, SO_168}, {SO_169, SO_170}, {SO_171, SO_172}, {SO_173, SO_174}, {SO_175, SO_176}, {SO_177, SO_178}, {SO_179, SO_180}, {SO_181, SO_182}, {SO_183, SO_184}, {SO_185, SO_186}, {SO_187, SO_188}, {SO_189, SO_190}, {SO_191, SO_192}, {SO_193, SO_194}, {SO_195, SO_196}, {SO_197, SO_198}, {SO_199, SO_200}, }); err != nil { return err } } if f.hdrAudio { // Two early versions of RPi1 had left and right reversed but we don't // bother handling this here. // https://github.com/raspberrypi/firmware/blob/master/extra/dt-blob.dts if !f.audioLeft41 { AUDIO_LEFT = bcm283x.GPIO45 // PWM1 for older boards } if err := pinreg.Register("AUDIO", [][]pin.Pin{ {AUDIO_LEFT}, {AUDIO_RIGHT}, }); err != nil { return err } } if f.hdrHDMI { if err := pinreg.Register("HDMI", [][]pin.Pin{{HDMI_HOTPLUG_DETECT}}); err != nil { return err } } return nil } // driver implements periph.Driver. type driver struct { } func (d *driver) String() string { return "rpi" } func (d *driver) Prerequisites() []string { return nil } func (d *driver) After() []string { return []string{"bcm283x-gpio"} } func (d *driver) Init() (bool, error) { if !Present() { return false, errors.New("board Raspberry Pi not detected") } // Setup headers based on board revision. // // This code is not futureproof, it will error out on a Raspberry Pi 4 // whenever it comes out. // Revision codes from: http://elinux.org/RPi_HardwareHistory f := features{} rev := distro.DTRevision() if rev == 0 { return true, fmt.Errorf("rpi: failed to obtain revision") } if err := f.init(rev); err != nil { return true, err } return true, f.registerHeaders() } func init() { if isArm { periph.MustRegister(&drv) } } var drv driver