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Shield pin configuration

2.2 Pin function multiplexing control (summary)

All GPIO pins on the Arduino* header require some internal GPIOs to be set up before the pin is usable. This is

usually as simple as setting an output enable, pullup enable, and mode. However, some pins have extra

functionality such as SPI, PWM, or I

C, so these pins need extra multiplexing (muxing) in order to be usable.

Table 3 shows this such that a programmer can easily see all the muxing pins affected for a given Arduino* header

pin. The color codes in the table show related boxes. For example, the blue boxes are meant to show the

relationship between the pin mux pins and the pin modes. This table is a synopsis of the more detailed tables

below, which contain extra information, such as schematic pin numbers. For most needs, this synopsized table

should suffice.

Table 3 Arduino* pin mux and pin mode settings

Linux

GPIO

GPIO pin mux SoC pin modes Output enable

(high = output)

Pullup

enable

Linux pin 0 (low) 1 (high) 0 1 Linux Linux

IO0

130

GPIO

UART

248

216

IO0

130

GPIO

UART

248

216

IO1

131 GPIO UART 249 217

IO2

128 GPIO UART 250 218

IO3

12 GPIO PWM 251 219

IO4

129

GPIO

UART

252

220

IO5

GPIO

PWM

253

221

IO6

182 GPIO PWM 254 222

IO7

48 GPIO 255 223

IO8

49 GPIO 256 224

IO9

183

GPIO

PWM

257

225

IO10

263

PWM

see 240

GPIO

I2S or SPI

258

226

240

GPIO or I2S

GPIO or SPI_FS

IO11

43 262 PWM see 241 GPIO I2S or SPI 259 227

241 GPIO or I2S GPIO or SPI TXD

IO12

42 242 GPIO or I2S GPIO or SPI RXD GPIO I2S or SPI 260 228

IO13

243

GPIO or I2S

GPIO or SPI CLK

GPIO

I2S or SPI

261

229

IO14 (A0)

200

GPIO

232

208

IO15 (A1)

201

GPIO

233

209

IO16 (A2)

46 202 GPIO A2 GPIO 234 210

IO17 (A3)

47 203 GPIO A3 GPIO 235 211

IO18 (A4)

204

GPIO or I2C SDA

GPIO

I2C-6

236

212

IO19 (A5)

165

205

GPIO or I2C SCL

GPIO

I2C-6

237

213

Note: Before setting up any muxing, set pin 214 (TRI_STATE_ALL) to LOW, make all of your changes, then set pin

214 to HIGH.

Intel® Edison Kit for Arduino*

December 2014 Hardware Guide

Document Number: 331191-004 9

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Intel Edison Compute Module (IoT) Specifiche Pagina 9

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