Kontron KTT20-pITX Manual de usuario descargar pdf (Pagina 33)

KTD-S0045-D Page 29 U-Boot Compilation

KTT20/pITX Software Guide

8.1 Hardware Components Compatibility

Between the KTT20/pITX and the 'Harmony' evaluation board there are following conformities/differences:

Component KTT20/pITX vs. 'Harmony' Evalboard

SDRAM Compatible

NAND Compatible

SPI

Flash Compatible

PMU Compatible

LAN Compatible

DVI

vs. HDMI

CRT Compatible

LVDS Compatible

USB Client Compatible

USB Nearly compatible

microSD

(MMC) Compatible

Audio Compatible

PCI Express

Compatible

Not compatible

UARTs Not compatible

GPIOs Not compatible

Temperature Sensor Compatible

8.2 GPIO Declarations

The directory 'drivers/gpio' contains a module named 'tegra2_gpio.c'. It disposes of all needed routines to

declare a GPIO as input or output respectively to read or write a value. An overview:

int gpio_request // Configure as GPIO (only in older versions)

int gpio_direction_input

// Set GPIO as input

int gpio_direction_output

// Set GPIO as output

int gpio_get_value

// Read input value

void gpio_set_value

// Set output value

Example (symbolic names see 'arch/arm/include/asm/arch-tegra2/gpio.h'):

// gpio_request is a function from older U-Boot versions - possibly not necessary

ret = gpio_request (GPIO_PT1, NULL); // define GPIO33 as GPIO, also labeled T.01

if (ret) {

do something; // Error

}

gpio_direction_input (GPIO_PT1); // Set GPIO as input

ret = gpio_get_value (GPIO_PT1); // Read value, result is always Bit 0

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 55 56

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Kontron KTT20-pITX Manual de usuario Pagina 33

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