Epson Powerspan Manual do Utilizador descarregar pdf (Página 13)

DIMM.AM335x (Rev3) 13/24

3.15 SPI Interface

The SPI1 interface of the AM335x is available at the SODIMM connector. The characteristics of the

interface can be individually controlled by software.

3.16 Digital and Analog I/Os

10 digital GPIO pins are provided normally at the SODIMM connector. All but 2 pins of the

DIMM.AM335x module can be used as simple GPIOs or can be programmed with their special

function.

The pins have the following characteristics:

SODIMM Pin

GPIO

Special Function

GPIO_0

GPIO0_7

PWM0

GPIO_1

- ***

USB1_ID

GPIO_2

GPIO1_21

USB1_OC#

GPIO_3

- ***

USB1_PEN#

GPIO_4

GPIO2_19

UART1_RI

GPIO_5

GPIO3_9

UART1_DCD

GPIO_6

GPIO2_18

UART1_DTR

GPIO_7

GPIO3_10

UART1_DSR

GPIO_8

GPIO0_13

UART1_RTS

GPIO_9

GPIO0_12

UART1_CTS

*** no GPIO function available

Besides the digital I/Os 4 analogue inputs of the AM335x are available at the SODIMM connector:

SODIMM Pin

Signal

ANA_IN1

AIN4

ANA_IN2

AIN5

ANA_IN3

AIN6

ANA_IN4

AIN7

The analogue inputs are controlled by the touch controller. In mixed mode they can be used as

general purpose inputs in parallel to the 4-wire touch screen inputs. Triggering of the conversions

must be done by software.

The integrated ADC has 12-bit resolution. The minimum conversion time is 15 ADC clock cycles.

Input voltages must not exceed 3.3 V.

3.17 Status LED

A bicolour LED is located on the top side of the DIMM-AM335x module. This LED is normally used

to signal the health state of the software.

After reset the LED shines red. After the bootloader has successfully started the LED shines green.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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