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robocar-pca9685/vendor/periph.io/x/host/v3/rpi/rpi.go

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// 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/conn/v3/driver/driverreg"
"periph.io/x/conn/v3/gpio"
"periph.io/x/conn/v3/pin"
"periph.io/x/conn/v3/pin/pinreg"
"periph.io/x/host/v3/bcm283x"
"periph.io/x/host/v3/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
memory8GB revisionCode = 5 << 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
boardZero2W revisionCode = 0x12 << boardShift
board400 revisionCode = 0x13 << boardShift
boardCM4 revisionCode = 0x14 << 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
case boardZero2W:
f.hdrP1P40 = true
f.hdrHDMI = true
case board400:
f.hdrP1P40 = true
f.hdrHDMI = true
case boardCM4:
// Compute Module does not have a SODIMM header.
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 {
driverreg.MustRegister(&drv)
}
}
var drv driver
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