Introduction

The SPI interface is implemented in the file dogmspi.c. This file can be replaced with any other file as long as the six functions below are implemented. See the template file below or here.

Functions

dog_spi_init

Setup the SPI interface: Setup I/O lines and directions, prepare SPI subsystem.

• Prototype

void dog_spi_init(void)

dog_spi_out

Output value via SPI.

• Prototype

unsigned char dog_spi_out(unsigned char data)

• Arguments
  • data: Value, which should be sent via SPI bus.

dog_spi_enable_client

Enable the display: Send low on the chip select line.

• Prototype

void dog_spi_enable_client(void)

dog_spi_disable_client

Disable the display: Send high on the chip select line.

• Prototype

void dog_spi_disable_client(void)

dog_cmd_mode

Enter command mode: Send low on A0 line.

• Prototype

void dog_cmd_mode(void)

dog_data_mode

Enter data mode: Send high on A0 line.

• Prototype

void dog_data_mode(void)

Variables

dog_spi_pin_a0

The value for this variable can be set through the user-API. In the Arduino Environment this variable contains the pin number which is connected to the A0 line of the display hardware.

• Declaration

extern uint8_t dog_spi_pin_a0;

dog_spi_pin_cs

The value for this variable can be set through the user-API. In the Arduino Environment this variable contains the pin number which is connected to the chip select line of the display hardware.

• Declaration

extern uint8_t dog_spi_pin_cs;

Template

#include "dogm128.h"

/* setup hardware pins, prepare SPI subsystem */
void dog_spi_init(void)
{
}

/* output a 8 bit value on the SPI bus */
unsigned char dog_spi_out(unsigned char data)
{
}

/* assign low to chip select line */
void dog_spi_enable_client(void)
{
}

/* assign high to chip select line */
void dog_spi_disable_client(void)
{
}

/* assign low to A0 line */
void dog_cmd_mode(void)
{
}

/* assign high to A0 line */
void dog_data_mode(void)
{
}