forked from google/periph
/
r8.go
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/
r8.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.
// This file contains pin mapping information that is specific to the Allwinner
// R8 model.
package allwinner
import (
"strings"
"periph.io/x/periph/conn/pin"
"periph.io/x/periph/host/sysfs"
)
// R8 specific pins.
var (
FEL *pin.BasicPin // Boot mode selection
MIC_IN *pin.BasicPin // Microphone in
MIC_GND *pin.BasicPin // Microphone ground
HP_LEFT *pin.BasicPin // Left speaker out
HP_RIGHT *pin.BasicPin // Right speaker out
HP_COM *pin.BasicPin // Speaker common
X1, X2, Y1, Y2 *pin.BasicPin // Touch screen pins
)
//
func init() {
FEL = &pin.BasicPin{N: "FEL"}
MIC_IN = &pin.BasicPin{N: "MIC_IN"}
MIC_GND = &pin.BasicPin{N: "MIC_GND"}
HP_LEFT = &pin.BasicPin{N: "HP_LEFT"}
HP_RIGHT = &pin.BasicPin{N: "HP_RIGHT"}
HP_COM = &pin.BasicPin{N: "HP_COM"}
X1 = &pin.BasicPin{N: "X1"}
X2 = &pin.BasicPin{N: "X2"}
Y1 = &pin.BasicPin{N: "Y1"}
Y2 = &pin.BasicPin{N: "Y2"}
}
// mappingR8 describes the mapping of each R8 processor gpio to their alternate
// functions.
//
// It omits the in & out functions which are available on all pins.
//
// The mapping comes from the datasheet page 18:
// https://github.com/NextThingCo/CHIP-Hardware/raw/master/CHIP%5Bv1_0%5D/CHIPv1_0-BOM-Datasheets/Allwinner%20R8%20Datasheet%20V1.2.pdf
//
// - The datasheet uses TWI instead of I2C but this is renamed here for consistency.
var mappingR8 = map[string][5]pin.Func{
"PB0": {"I2C0_SCL"},
"PB1": {"I2C0_SDA"},
"PB2": {"PWM0", "", "", "", "EINT16"},
"PB3": {"IR_TX", "", "", "", "EINT17"},
"PB4": {"IR_RX", "", "", "", "EINT18"},
"PB10": {"SPI2_CS1"},
"PB15": {"I2C1_SCL"},
"PB16": {"I2C1_SDA"},
"PB17": {"I2C2_SCL"},
"PB18": {"I2C2_SDA"},
"PC0": {"NAND_WE", "SPI0_MOSI"},
"PC1": {"NAND_ALE", "SPI0_MISO"},
"PC2": {"NAND_CLE", "SPI0_CLK"},
"PC3": {"NAND_CE1", "SPI0_CS0"},
"PC4": {"NAND_CE0"},
"PC5": {"NAND_RE"},
"PC6": {"NAND_RB0", "SDC2_CMD"},
"PC7": {"NAND_RB1", "SDC2_CLK"},
"PC8": {"NAND_DQ0", "SDC2_D0"},
"PC9": {"NAND_DQ1", "SDC2_D1"},
"PC10": {"NAND_DQ2", "SDC2_D2"},
"PC11": {"NAND_DQ3", "SDC2_D3"},
"PC12": {"NAND_DQ4", "SDC2_D4"},
"PC13": {"NAND_DQ5", "SDC2_D5"},
"PC14": {"NAND_DQ6", "SDC2_D6"},
"PC15": {"NAND_DQ7", "SDC2_D7"},
"PC19": {""},
"PD2": {"LCD_D2", "UART2_TX"},
"PD3": {"LCD_D3", "UART2_RX"},
"PD4": {"LCD_D4", "UART2_CTX"},
"PD5": {"LCD_D5", "UART2_RTS"},
"PD6": {"LCD_D6", "ECRS"},
"PD7": {"LCD_D7", "ECOL"},
"PD10": {"LCD_D10", "ERXD0"},
"PD11": {"LCD_D11", "ERXD1"},
"PD12": {"LCD_D12", "ERXD2"},
"PD13": {"LCD_D13", "ERXD3"},
"PD14": {"LCD_D14", "ERXCK"},
"PD15": {"LCD_D15", "ERXERR"},
"PD18": {"LCD_D18", "ERXDV"},
"PD19": {"LCD_D19", "ETXD0"},
"PD20": {"LCD_D20", "ETXD1"},
"PD21": {"LCD_D21", "ETXD2"},
"PD22": {"LCD_D22", "ETXD3"},
"PD23": {"LCD_D23", "ETXEN"},
"PD24": {"LCD_CLK", "ETXCK"},
"PD25": {"LCD_DE", "ETXERR"},
"PD26": {"LCD_HSYNC", "EMDC"},
"PD27": {"LCD_VSYNC", "EMDIO"},
"PE0": {"TS_CLK", "CSI_PCLK", "SPI2_CS0", "", "EINT14"},
"PE1": {"TS_ERR", "CSI_MCLK", "SPI2_CLK", "", "EINT15"},
"PE2": {"TS_SYNC", "CSI_HSYNC", "SPI2_MOSI"},
"PE3": {"TS_DVLD", "CSI_VSYNC", "SPI2_MISO"},
"PE4": {"TS_D0", "CSI_D0", "SDC2_D0"},
"PE5": {"TS_D1", "CSI_D1", "SDC2_D1"},
"PE6": {"TS_D2", "CSI_D2", "SDC2_D2"},
"PE7": {"TS_D3", "CSI_D3", "SDC2_D3"},
"PE8": {"TS_D4", "CSI_D4", "SDC2_CMD"},
"PE9": {"TS_D5", "CSI_D5", "SDC2_CLK"},
"PE10": {"TS_D6", "CSI_D6", "UART1_TX"},
"PE11": {"TS_D7", "CSI_D7", "UART1_RX"},
"PF0": {"SDC0_D1", "", "JTAG1_TMS"},
"PF1": {"SDC0_D0", "", "JTAG1_TDI"},
"PF2": {"SDC0_CLK", "", "UART0_TX"},
"PF3": {"SDC0_CMD", "", "JTAG1_TDO"},
"PF4": {"SDC0_D3", "", "UART0_RX"},
"PF5": {"SDC0_D2", "", "JTAG1_TCK"},
"PG0": {"GPS_CLK", "", "", "", "EINT0"},
"PG1": {"GPS_SIGN", "", "", "", "EINT1"},
"PG2": {"GPS_MAG", "", "", "", "EINT2"},
"PG3": {"", "", "UART1_TX", "", "EINT3"},
"PG4": {"", "", "UART1_RX", "", "EINT4"},
"PG9": {"SPI1_CS0", "UART3_TX", "", "", "EINT9"},
"PG10": {"SPI1_CLK", "UART3_RX", "", "", "EINT10"},
"PG11": {"SPI1_MOSI", "UART3_CTS", "", "", "EINT11"},
"PG12": {"SPI1_MISO", "UART3_RTS", "", "", "EINT12"},
}
// mapR8Pins uses mappingR8 to actually set the altFunc fields of all gpio and
// mark them as available.
//
// It is called by the generic allwinner processor code if a R8 is detected.
func mapR8Pins() error {
for name, altFuncs := range mappingR8 {
pin := cpupins[name]
pin.altFunc = altFuncs
pin.available = true
if strings.Contains(string(altFuncs[4]), "EINT") {
pin.supportEdge = true
}
// Initializes the sysfs corresponding pin right away.
pin.sysfsPin = sysfs.Pins[pin.Number()]
}
return nil
}