void ssd1306_reset(SSD1306 *p)
{
if (!p) return;
rpiIO_digitalWrite(p->resetPin, 0);
ssd1306_delay(10);
rpiIO_digitalWrite(p->resetPin, 1);
}
int
main(int argc, char * argv[])
{
printf("Starting SSD1306 Test\n");
int spiChannel = 0;
int resetPin = 17;
int dcPin = 21;
printf("Using SPI Channel %d\n", spiChannel);
printf("Reset Pin = %d, DC Pin = %d\n", resetPin, dcPin);
/*
* 10 MHz did work on a breadboard
* safer to use slower speeds probably
* 200 kHz is the approximate minimum
* otherwise not all data will be transmitted
*/
int clock = 200000;
SSD1306 * disp = ssd1306_create(spiChannel, resetPin, dcPin, clock);
printf("Init\n");
ssd1306_init(disp, SSD1306_ROWS_64, SSD1306_VCCSATE_SWITCHCAP);
int y = 0;
int x = 0;
for (; x < 100; x += 1) {
for (y = 0; y < 10; ++y) {
ssd1306_setPixel(disp, x, y, 1);
}
}
for (x = 0; x < 100; x += 10) {
for (y = 0; y < 10; ++y) {
ssd1306_setPixel(disp, x, y, 0);
}
}
printf("Display 10 white Boxes\n");
ssd1306_display(disp);
ssd1306_delay(1000);
printf("Clear\n");
ssd1306_clear(disp, 0);
printf("Draw Lines\n");
int i;
for (i=0; i < 128; i+=4) {
ssd1306_drawLine(disp, 0, 0, i, 64-1, 1);
ssd1306_display(disp);
}
for (i=0; i < 64; i+=4) {
ssd1306_drawLine(disp, 0, 0, 128-1, i, 1);
ssd1306_display(disp);
}
printf("Start Scrool Right\n");
ssd1306_startScrollRight(disp, 0x00, 0x0F);
ssd1306_delay(2000);
ssd1306_stopScroll(disp);
ssd1306_delay(1000);
printf("Start Scrool Left\n");
ssd1306_startScrollLeft(disp, 0x00, 0x0F);
ssd1306_delay(2000);
ssd1306_stopScroll(disp);
ssd1306_delay(1000);
ssd1306_destroy(disp);
return 0;
}
static void begin(SSD1306 *p)
{
ssd1306_delay(1);
ssd1306_reset(p);
ssd1306_command(p, SSD1306_DISPLAYOFF);
ssd1306_command(p, SSD1306_SETDISPLAYCLOCKDIV);
ssd1306_command(p, 0x80);
ssd1306_command(p, SSD1306_SETMULTIPLEX);
if (p->rowtype == SSD1306_ROWS_32)
{
ssd1306_command(p, 0x1F);
}
else if (p->rowtype == SSD1306_ROWS_64)
{
ssd1306_command(p, 0x3F);
}
ssd1306_command(p, SSD1306_SETDISPLAYOFFSET);
ssd1306_command(p, 0x00);
ssd1306_command(p, SSD1306_SETSTARTLINE | 0x00);
ssd1306_command(p, SSD1306_CHARGEPUMP);
if (p->vccstate == SSD1306_VCCSATE_EXTERNAL)
{
ssd1306_command(p, 0x10);
}
else
{
ssd1306_command(p, 0x14);
}
ssd1306_command(p, SSD1306_MEMORYMODE);
ssd1306_command(p, 0x00);
ssd1306_command(p, SSD1306_SEGREMAP | 0x01);
ssd1306_command(p, SSD1306_COMSCANDEC);
if (p->rowtype == SSD1306_ROWS_32)
{
ssd1306_command(p, SSD1306_SETCOMPINS);
ssd1306_command(p, 0x02);
ssd1306_command(p, SSD1306_SETCONTRAST);
ssd1306_command(p, 0x8F);
}
else if (p->rowtype == SSD1306_ROWS_64)
{
ssd1306_command(p, SSD1306_SETCOMPINS);
ssd1306_command(p, 0x12);
ssd1306_command(p, SSD1306_SETCONTRAST);
if (p->vccstate == SSD1306_VCCSATE_EXTERNAL)
{
ssd1306_command(p, 0x9F);
}
else
{
ssd1306_command(p, 0xCF);
}
}
ssd1306_command(p, SSD1306_SETPRECHARGE);
if (p->vccstate == SSD1306_VCCSATE_EXTERNAL)
{
ssd1306_command(p, 0x22);
}
else
{
ssd1306_command(p, 0xF1);
}
ssd1306_command(p, SSD1306_SETVCOMDETECT);
ssd1306_command(p, 0x40);
ssd1306_command(p, SSD1306_DISPLAYALLON_RESUME);
ssd1306_command(p, SSD1306_NORMALDISPLAY);
ssd1306_command(p, SSD1306_DISPLAYON);
}
