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ssd1306.c
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ssd1306.c
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#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "nrf_delay.h"
#include "nrf_gpio.h"
#include "nrf_drv_twi.h"
#include "spi_module.h"
#include "nordic_common.h"
#include "binary.h"
#include "ssd1306.h"
#include "app_error.h"
#include "app_util_platform.h"
static uint8_t _i2caddr, _vccstate;
static uint32_t _dc, _rs, _cs;
static int16_t _width, _height, WIDTH, HEIGHT, cursor_x, cursor_y;
static uint8_t textsize, rotation;
static uint16_t textcolor, textbgcolor;
bool wrap, // If set, 'wrap' text at right edge of display
_cp437; // If set, use correct CP437 charset (default is off)
/**
* @brief TWI master instance
*
* Instance of TWI master driver that would be used for communication with simulated
* eeprom memory.
*/
static const nrf_drv_twi_t m_twi_master = {
.p_reg = NRF_TWI1,
.irq = TWI1_IRQ,
.instance_id = TWI1_INSTANCE_INDEX
};
void twi_evt_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
#if 0
if (p_event->type == NRF_DRV_TWI_ERROR) {
printf("E\r\n");
}
if (p_event->type == NRF_DRV_TWI_TX_DONE) {
printf("T\r\n");
}
if (p_event->type == NRF_DRV_TWI_RX_DONE) {
printf("R\r\n");
}
#endif
}
ret_code_t twi_master_init(uint32_t scl, uint32_t sda)
{
ret_code_t ret;
const nrf_drv_twi_config_t config = {
.scl = scl,
.sda = sda,
.frequency = TWI1_CONFIG_FREQUENCY,
.interrupt_priority = TWI1_CONFIG_IRQ_PRIORITY
};
do {
ret = nrf_drv_twi_init(&m_twi_master, &config, /*twi_evt_handler*/NULL, NULL);
if (NRF_SUCCESS != ret) {
break;
}
nrf_drv_twi_enable(&m_twi_master);
}
while (0);
return ret;
}
static volatile bool use_i2c = false;
#define _HI(p) nrf_gpio_pin_set(p)
#define _LO(p) nrf_gpio_pin_clear(p)
#define _HI_RS() _HI(_rs)
#define _LO_RS() _LO(_rs)
#define _HI_DC() _HI(_dc)
#define _LO_DC() _LO(_dc)
#define _HI_CS() _HI(_cs)
#define _LO_CS() _LO(_cs)
#include "glcdfont.c"
// the memory buffer for the LCD
static uint8_t buffer[SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH / 8] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x80, 0x80, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xF8, 0xE0, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80,
0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x00, 0xFF,
#if (SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH > 96*16)
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00,
0x80, 0xFF, 0xFF, 0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x80, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00, 0x8C, 0x8E, 0x84, 0x00, 0x00, 0x80, 0xF8,
0xF8, 0xF8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xE0, 0xE0, 0xC0, 0x80,
0x00, 0xE0, 0xFC, 0xFE, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFF, 0xC7, 0x01, 0x01,
0x01, 0x01, 0x83, 0xFF, 0xFF, 0x00, 0x00, 0x7C, 0xFE, 0xC7, 0x01, 0x01, 0x01, 0x01, 0x83, 0xFF,
0xFF, 0xFF, 0x00, 0x38, 0xFE, 0xC7, 0x83, 0x01, 0x01, 0x01, 0x83, 0xC7, 0xFF, 0xFF, 0x00, 0x00,
0x01, 0xFF, 0xFF, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x07, 0x01, 0x01, 0x01, 0x00, 0x00, 0x7F, 0xFF,
0x80, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x7F, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x01, 0xFF,
0xFF, 0xFF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0x0F, 0x3F, 0x7F, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xC7, 0xC7, 0x8F,
0x8F, 0x9F, 0xBF, 0xFF, 0xFF, 0xC3, 0xC0, 0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0xFC, 0xFC,
0xFC, 0xFC, 0xFC, 0xFC, 0xFC, 0xF8, 0xF8, 0xF0, 0xF0, 0xE0, 0xC0, 0x00, 0x01, 0x03, 0x03, 0x03,
0x03, 0x03, 0x01, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01,
0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01, 0x03, 0x03, 0x00, 0x00,
0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x03, 0x03, 0x03, 0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x01, 0x00, 0x00, 0x00, 0x03,
0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
#if (SSD1306_LCDHEIGHT == 64)
0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3F, 0x1F, 0x0F,
0x87, 0xC7, 0xF7, 0xFF, 0xFF, 0x1F, 0x1F, 0x3D, 0xFC, 0xF8, 0xF8, 0xF8, 0xF8, 0x7C, 0x7D, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x3F, 0x0F, 0x07, 0x00, 0x30, 0x30, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE0, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x7F, 0x3F, 0x1F,
0x0F, 0x07, 0x1F, 0x7F, 0xFF, 0xFF, 0xF8, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xF8, 0xE0,
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00,
0x00, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x0E, 0xFC, 0xF8, 0x00, 0x00, 0xF0, 0xF8, 0x1C, 0x0E,
0x06, 0x06, 0x06, 0x0C, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x00, 0xFC,
0xFE, 0xFC, 0x00, 0x18, 0x3C, 0x7E, 0x66, 0xE6, 0xCE, 0x84, 0x00, 0x00, 0x06, 0xFF, 0xFF, 0x06,
0x06, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x06, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0xC0, 0xF8,
0xFC, 0x4E, 0x46, 0x46, 0x46, 0x4E, 0x7C, 0x78, 0x40, 0x18, 0x3C, 0x76, 0xE6, 0xCE, 0xCC, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x07, 0x0F, 0x1F, 0x1F, 0x3F, 0x3F, 0x3F, 0x3F, 0x1F, 0x0F, 0x03,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00,
0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x03, 0x07, 0x0E, 0x0C,
0x18, 0x18, 0x0C, 0x06, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x01, 0x0F, 0x0E, 0x0C, 0x18, 0x0C, 0x0F,
0x07, 0x01, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00,
0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x07,
0x07, 0x0C, 0x0C, 0x18, 0x1C, 0x0C, 0x06, 0x06, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
#endif
#endif
};
#define ssd1306_swap(a, b) { int16_t t = a; a = b; b = t; }
#define adagfxswap(a, b) { int16_t t = a; a = b; b = t; }
// Return the size of the display (per current rotation)
int16_t ssd1306_width(void)
{
return _width;
}
int16_t ssd1306_height(void)
{
return _height;
}
void set_rotation(uint8_t x)
{
rotation = (x & 3);
switch (rotation) {
case 0:
case 2:
_width = WIDTH;
_height = HEIGHT;
break;
case 1:
case 3:
_width = HEIGHT;
_height = WIDTH;
break;
}
}
void ssd1306_init(uint32_t dc, uint32_t rs, uint32_t cs, uint32_t clk, uint32_t mosi)
{
_dc = dc;
_rs = rs;
_cs = cs;
nrf_gpio_cfg_output(dc);
nrf_gpio_cfg_output(rs);
_HI_CS();
nrf_gpio_cfg_output(rs);
spi_init(clk, mosi);
}
void ssd1306_init_i2c(uint32_t scl, uint32_t sda)
{
_i2caddr = SSD1306_I2C_ADDRESS;
use_i2c = true;
twi_master_init(scl, sda);
}
void ssd1306_command(uint8_t c)
{
if (use_i2c) {
ret_code_t ret;
uint8_t dta_send[] = {0x00, c};
ret = nrf_drv_twi_tx(&m_twi_master, _i2caddr, dta_send, 2, false);
UNUSED_VARIABLE(ret);
}
else {
_HI_CS();
_LO_DC();
_LO_CS();
UNUSED_VARIABLE(spi_transfer(&c, 1));
_HI_CS();
}
}
void ssd1306_begin(uint8_t vccstate, uint8_t i2caddr, bool reset)
{
_vccstate = vccstate;
_i2caddr = i2caddr;
UNUSED_VARIABLE(_i2caddr);
_width = WIDTH;
_height = HEIGHT;
cursor_y = cursor_x = 0;
textsize = 1;
textcolor = textbgcolor = 0xFFFF;
wrap = true;
_cp437 = false;
_width = WIDTH = SSD1306_LCDWIDTH;
_height = HEIGHT = SSD1306_LCDHEIGHT;
rotation = 0;
if (reset) {
// Setup reset pin direction (used by both SPI and I2C)
_HI_RS();
// VDD (3.3V) goes high at start, lets just chill for a ms
nrf_delay_ms(1);
// bring reset low
_LO_RS();
// wait 10ms
nrf_delay_ms(10);
// bring out of reset
_HI_RS();
// turn on VCC (9V?)
}
#if defined SSD1306_128_32
// Init sequence for 128x32 OLED module
ssd1306_command(SSD1306_DISPLAYOFF); // 0xAE
ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5
ssd1306_command(0x80); // the suggested ratio 0x80
ssd1306_command(SSD1306_SETMULTIPLEX); // 0xA8
ssd1306_command(0x1F);
ssd1306_command(SSD1306_SETDISPLAYOFFSET); // 0xD3
ssd1306_command(0x0); // no offset
ssd1306_command(SSD1306_SETSTARTLINE | 0x0); // line #0
ssd1306_command(SSD1306_CHARGEPUMP); // 0x8D
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x10);
}
else {
ssd1306_command(0x14);
}
ssd1306_command(SSD1306_MEMORYMODE); // 0x20
ssd1306_command(0x00); // 0x0 act like ks0108
ssd1306_command(SSD1306_SEGREMAP | 0x1);
ssd1306_command(SSD1306_COMSCANDEC);
ssd1306_command(SSD1306_SETCOMPINS); // 0xDA
ssd1306_command(0x02);
ssd1306_command(SSD1306_SETCONTRAST); // 0x81
ssd1306_command(0x8F);
ssd1306_command(SSD1306_SETPRECHARGE); // 0xd9
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x22);
}
else {
ssd1306_command(0xF1);
}
ssd1306_command(SSD1306_SETVCOMDETECT); // 0xDB
ssd1306_command(0x40);
ssd1306_command(SSD1306_DISPLAYALLON_RESUME); // 0xA4
ssd1306_command(SSD1306_NORMALDISPLAY); // 0xA6
#endif
#if defined SSD1306_128_64
// Init sequence for 128x64 OLED module
ssd1306_command(SSD1306_DISPLAYOFF); // 0xAE
ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5
ssd1306_command(0x80); // the suggested ratio 0x80
ssd1306_command(SSD1306_SETMULTIPLEX); // 0xA8
ssd1306_command(0x3F);
ssd1306_command(SSD1306_SETDISPLAYOFFSET); // 0xD3
ssd1306_command(0x0); // no offset
ssd1306_command(SSD1306_SETSTARTLINE | 0x0); // line #0
ssd1306_command(SSD1306_CHARGEPUMP); // 0x8D
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x10);
}
else {
ssd1306_command(0x14);
}
ssd1306_command(SSD1306_MEMORYMODE); // 0x20
ssd1306_command(0x00); // 0x0 act like ks0108
ssd1306_command(SSD1306_SEGREMAP | 0x1);
ssd1306_command(SSD1306_COMSCANDEC);
ssd1306_command(SSD1306_SETCOMPINS); // 0xDA
ssd1306_command(0x12);
ssd1306_command(SSD1306_SETCONTRAST); // 0x81
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x9F);
}
else {
ssd1306_command(0xCF);
}
ssd1306_command(SSD1306_SETPRECHARGE); // 0xd9
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x22);
}
else {
ssd1306_command(0xF1);
}
ssd1306_command(SSD1306_SETVCOMDETECT); // 0xDB
ssd1306_command(0x40);
ssd1306_command(SSD1306_DISPLAYALLON_RESUME); // 0xA4
ssd1306_command(SSD1306_NORMALDISPLAY); // 0xA6
#endif
#if defined SSD1306_96_16
// Init sequence for 96x16 OLED module
ssd1306_command(SSD1306_DISPLAYOFF); // 0xAE
ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5
ssd1306_command(0x80); // the suggested ratio 0x80
ssd1306_command(SSD1306_SETMULTIPLEX); // 0xA8
ssd1306_command(0x0F);
ssd1306_command(SSD1306_SETDISPLAYOFFSET); // 0xD3
ssd1306_command(0x00); // no offset
ssd1306_command(SSD1306_SETSTARTLINE | 0x0); // line #0
ssd1306_command(SSD1306_CHARGEPUMP); // 0x8D
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x10);
}
else {
ssd1306_command(0x14);
}
ssd1306_command(SSD1306_MEMORYMODE); // 0x20
ssd1306_command(0x00); // 0x0 act like ks0108
ssd1306_command(SSD1306_SEGREMAP | 0x1);
ssd1306_command(SSD1306_COMSCANDEC);
ssd1306_command(SSD1306_SETCOMPINS); // 0xDA
ssd1306_command(0x2); //ada x12
ssd1306_command(SSD1306_SETCONTRAST); // 0x81
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x10);
}
else {
ssd1306_command(0xAF);
}
ssd1306_command(SSD1306_SETPRECHARGE); // 0xd9
if (vccstate == SSD1306_EXTERNALVCC) {
ssd1306_command(0x22);
}
else {
ssd1306_command(0xF1);
}
ssd1306_command(SSD1306_SETVCOMDETECT); // 0xDB
ssd1306_command(0x40);
ssd1306_command(SSD1306_DISPLAYALLON_RESUME); // 0xA4
ssd1306_command(SSD1306_NORMALDISPLAY); // 0xA6
#endif
ssd1306_command(SSD1306_DISPLAYON);//--turn on oled panel
}
// the most basic function, set a single pixel
void ssd1306_draw_pixel(int16_t x, int16_t y, uint16_t color)
{
if ((x < 0) || (x >= ssd1306_width()) || (y < 0) || (y >= ssd1306_height()))
return;
// check rotation, move pixel around if necessary
switch (rotation) {
case 1:
ssd1306_swap(x, y);
x = WIDTH - x - 1;
break;
case 2:
x = WIDTH - x - 1;
y = HEIGHT - y - 1;
break;
case 3:
ssd1306_swap(x, y);
y = HEIGHT - y - 1;
break;
}
// x is which column
switch (color) {
case WHITE:
buffer[x + (y / 8)*SSD1306_LCDWIDTH] |= (1 << (y & 7));
break;
case BLACK:
buffer[x + (y / 8)*SSD1306_LCDWIDTH] &= ~(1 << (y & 7));
break;
case INVERSE:
buffer[x + (y / 8)*SSD1306_LCDWIDTH] ^= (1 << (y & 7));
break;
}
}
void ssd1306_invert_display(uint8_t i)
{
if (i) {
ssd1306_command(SSD1306_INVERTDISPLAY);
}
else {
ssd1306_command(SSD1306_NORMALDISPLAY);
}
}
// startscrollright
// Activate a right handed scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void ssd1306_start_scroll_right(uint8_t start, uint8_t stop)
{
ssd1306_command(SSD1306_RIGHT_HORIZONTAL_SCROLL);
ssd1306_command(0X00);
ssd1306_command(start);
ssd1306_command(0X00);
ssd1306_command(stop);
ssd1306_command(0X00);
ssd1306_command(0XFF);
ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}
// startscrollleft
// Activate a right handed scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void ssd1306_start_scroll_left(uint8_t start, uint8_t stop)
{
ssd1306_command(SSD1306_LEFT_HORIZONTAL_SCROLL);
ssd1306_command(0X00);
ssd1306_command(start);
ssd1306_command(0X00);
ssd1306_command(stop);
ssd1306_command(0X00);
ssd1306_command(0XFF);
ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}
// startscrolldiagright
// Activate a diagonal scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void ssd1306_start_scroll_diag_right(uint8_t start, uint8_t stop)
{
ssd1306_command(SSD1306_SET_VERTICAL_SCROLL_AREA);
ssd1306_command(0X00);
ssd1306_command(SSD1306_LCDHEIGHT);
ssd1306_command(SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL);
ssd1306_command(0X00);
ssd1306_command(start);
ssd1306_command(0X00);
ssd1306_command(stop);
ssd1306_command(0X01);
ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}
// startscrolldiagleft
// Activate a diagonal scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void ssd1306_start_scroll_diag_left(uint8_t start, uint8_t stop)
{
ssd1306_command(SSD1306_SET_VERTICAL_SCROLL_AREA);
ssd1306_command(0X00);
ssd1306_command(SSD1306_LCDHEIGHT);
ssd1306_command(SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL);
ssd1306_command(0X00);
ssd1306_command(start);
ssd1306_command(0X00);
ssd1306_command(stop);
ssd1306_command(0X01);
ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}
void ssd1306_stop_scroll(void)
{
ssd1306_command(SSD1306_DEACTIVATE_SCROLL);
}
// Dim the display
// dim = true: display is dimmed
// dim = false: display is normal
void ssd1306_dim(bool dim)
{
uint8_t contrast;
if (dim) {
contrast = 0; // Dimmed display
}
else {
if (_vccstate == SSD1306_EXTERNALVCC) {
contrast = 0x9F;
}
else {
contrast = 0xCF;
}
}
// the range of contrast to too small to be really useful
// it is useful to dim the display
ssd1306_command(SSD1306_SETCONTRAST);
ssd1306_command(contrast);
}
void ssd1306_data(uint8_t c)
{
if (use_i2c) {
ret_code_t ret;
uint8_t dta_send[] = {0x40, c};
ret = nrf_drv_twi_tx(&m_twi_master, _i2caddr, dta_send, 2, false);
UNUSED_VARIABLE(ret);
}
else {
_HI_CS();
_HI_DC();
_LO_CS();
UNUSED_VARIABLE(spi_transfer(&c, 1));
_HI_CS();
}
}
void ssd1306_display(void)
{
ssd1306_command(SSD1306_COLUMNADDR);
ssd1306_command(0); // Column start address (0 = reset)
ssd1306_command(SSD1306_LCDWIDTH - 1); // Column end address (127 = reset)
ssd1306_command(SSD1306_PAGEADDR);
ssd1306_command(0); // Page start address (0 = reset)
#if SSD1306_LCDHEIGHT == 64
ssd1306_command(7); // Page end address
#endif
#if SSD1306_LCDHEIGHT == 32
ssd1306_command(3); // Page end address
#endif
#if SSD1306_LCDHEIGHT == 16
ssd1306_command(1); // Page end address
#endif
if (use_i2c) {
static uint8_t control = 0x40;
nrf_drv_twi_tx(&m_twi_master, _i2caddr, &control, 1, true);
nrf_drv_twi_tx(&m_twi_master, _i2caddr, buffer, (SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8), false);
}
else {
_HI_CS();
_HI_DC();
_LO_CS();
for (uint16_t i = 0; i < (SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8); i++) {
UNUSED_VARIABLE(spi_transfer(&buffer[i], 1));
}
_HI_CS();
}
}
// clear everything
void ssd1306_clear_display(void)
{
memset(buffer, 0, (SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8));
}
void ssd1306_draw_fast_hline(int16_t x, int16_t y, int16_t w, uint16_t color)
{
bool __swap = false;
switch (rotation) {
case 0:
// 0 degree rotation, do nothing
break;
case 1:
// 90 degree rotation, swap x & y for rotation, then invert x
__swap = true;
ssd1306_swap(x, y);
x = WIDTH - x - 1;
break;
case 2:
// 180 degree rotation, invert x and y - then shift y around for height.
x = WIDTH - x - 1;
y = HEIGHT - y - 1;
x -= (w - 1);
break;
case 3:
// 270 degree rotation, swap x & y for rotation, then invert y and adjust y for w (not to become h)
__swap = true;
ssd1306_swap(x, y);
y = HEIGHT - y - 1;
y -= (w - 1);
break;
}
if (__swap) {
ssd1306_draw_fast_vline_internal(x, y, w, color);
}
else {
ssd1306_draw_fast_hline_internal(x, y, w, color);
}
}
void ssd1306_draw_fast_hline_internal(int16_t x, int16_t y, int16_t w, uint16_t color)
{
// Do bounds/limit checks
if (y < 0 || y >= HEIGHT) {
return;
}
// make sure we don't try to draw below 0
if (x < 0) {
w += x;
x = 0;
}
// make sure we don't go off the edge of the display
if ( (x + w) > WIDTH) {
w = (WIDTH - x);
}
// if our width is now negative, punt
if (w <= 0) {
return;
}
// set up the pointer for movement through the buffer
register uint8_t *pBuf = buffer;
// adjust the buffer pointer for the current row
pBuf += ((y / 8) * SSD1306_LCDWIDTH);
// and offset x columns in
pBuf += x;
register uint8_t mask = 1 << (y & 7);
switch (color) {
case WHITE:
while (w--) {
*pBuf++ |= mask;
};
break;
case BLACK:
mask = ~mask;
while (w--) {
*pBuf++ &= mask;
};
break;
case INVERSE:
while (w--) {
*pBuf++ ^= mask;
};
break;
}
}
void ssd1306_draw_fast_vline(int16_t x, int16_t y, int16_t h, uint16_t color)
{
bool __swap = false;
switch (rotation) {
case 0:
break;
case 1:
// 90 degree rotation, swap x & y for rotation, then invert x and adjust x for h (now to become w)
__swap = true;
ssd1306_swap(x, y);
x = WIDTH - x - 1;
x -= (h - 1);
break;
case 2:
// 180 degree rotation, invert x and y - then shift y around for height.
x = WIDTH - x - 1;
y = HEIGHT - y - 1;
y -= (h - 1);
break;
case 3:
// 270 degree rotation, swap x & y for rotation, then invert y
__swap = true;
ssd1306_swap(x, y);
y = HEIGHT - y - 1;
break;
}
if (__swap) {
ssd1306_draw_fast_hline_internal(x, y, h, color);
}
else {
ssd1306_draw_fast_vline_internal(x, y, h, color);
}
}
void ssd1306_draw_fast_vline_internal(int16_t x, int16_t __y, int16_t __h, uint16_t color)
{
// do nothing if we're off the left or right side of the screen
if (x < 0 || x >= WIDTH) {
return;
}
// make sure we don't try to draw below 0
if (__y < 0) {
// __y is negative, this will subtract enough from __h to account for __y being 0
__h += __y;
__y = 0;
}
// make sure we don't go past the height of the display
if ( (__y + __h) > HEIGHT) {
__h = (HEIGHT - __y);
}
// if our height is now negative, punt
if (__h <= 0) {
return;
}
// this display doesn't need ints for coordinates, use local byte registers for faster juggling
register uint8_t y = __y;
register uint8_t h = __h;
// set up the pointer for fast movement through the buffer
register uint8_t *pBuf = buffer;
// adjust the buffer pointer for the current row
pBuf += ((y / 8) * SSD1306_LCDWIDTH);
// and offset x columns in
pBuf += x;
// do the first partial byte, if necessary - this requires some masking
register uint8_t mod = (y & 7);
if (mod) {
// mask off the high n bits we want to set
mod = 8 - mod;
// note - lookup table results in a nearly 10% performance improvement in fill* functions
// register uint8_t mask = ~(0xFF >> (mod));
static uint8_t premask[8] = {0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE };
register uint8_t mask = premask[mod];
// adjust the mask if we're not going to reach the end of this byte
if ( h < mod) {
mask &= (0XFF >> (mod - h));
}
switch (color) {
case WHITE:
*pBuf |= mask;
break;
case BLACK:
*pBuf &= ~mask;
break;
case INVERSE:
*pBuf ^= mask;
break;
}
// fast exit if we're done here!
if (h < mod) {
return;
}
h -= mod;
pBuf += SSD1306_LCDWIDTH;
}
// write solid bytes while we can - effectively doing 8 rows at a time
if (h >= 8) {
if (color == INVERSE) { // separate copy of the code so we don't impact performance of the black/white write version with an extra comparison per loop
do {
*pBuf = ~(*pBuf);
// adjust the buffer forward 8 rows worth of data
pBuf += SSD1306_LCDWIDTH;
// adjust h & y (there's got to be a faster way for me to do this, but this should still help a fair bit for now)
h -= 8;
}
while (h >= 8);
}
else {
// store a local value to work with
register uint8_t val = (color == WHITE) ? 255 : 0;
do {
// write our value in
*pBuf = val;
// adjust the buffer forward 8 rows worth of data
pBuf += SSD1306_LCDWIDTH;
// adjust h & y (there's got to be a faster way for me to do this, but this should still help a fair bit for now)
h -= 8;
}
while (h >= 8);
}
}
// now do the final partial byte, if necessary
if (h) {
mod = h & 7;
// this time we want to mask the low bits of the byte, vs the high bits we did above
// register uint8_t mask = (1 << mod) - 1;
// note - lookup table results in a nearly 10% performance improvement in fill* functions
static uint8_t postmask[8] = {0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F };
register uint8_t mask = postmask[mod];
switch (color) {
case WHITE:
*pBuf |= mask;
break;
case BLACK:
*pBuf &= ~mask;
break;
case INVERSE:
*pBuf ^= mask;
break;
}
}
}
// Draw a circle outline
void ssd1306_draw_circle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
{
int16_t f = 1 - r;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * r;
int16_t x = 0;
int16_t y = r;
ssd1306_draw_pixel(x0 , y0 + r, color);
ssd1306_draw_pixel(x0 , y0 - r, color);
ssd1306_draw_pixel(x0 + r, y0 , color);
ssd1306_draw_pixel(x0 - r, y0 , color);
while (x < y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
ssd1306_draw_pixel(x0 + x, y0 + y, color);
ssd1306_draw_pixel(x0 - x, y0 + y, color);
ssd1306_draw_pixel(x0 + x, y0 - y, color);
ssd1306_draw_pixel(x0 - x, y0 - y, color);
ssd1306_draw_pixel(x0 + y, y0 + x, color);
ssd1306_draw_pixel(x0 - y, y0 + x, color);
ssd1306_draw_pixel(x0 + y, y0 - x, color);
ssd1306_draw_pixel(x0 - y, y0 - x, color);
}
}
void ssd1306_draw_circle_helper(int16_t x0, int16_t y0,
int16_t r, uint8_t cornername, uint16_t color)
{
int16_t f = 1 - r;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * r;
int16_t x = 0;
int16_t y = r;
while (x < y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
if (cornername & 0x4) {
ssd1306_draw_pixel(x0 + x, y0 + y, color);
ssd1306_draw_pixel(x0 + y, y0 + x, color);
}
if (cornername & 0x2) {
ssd1306_draw_pixel(x0 + x, y0 - y, color);
ssd1306_draw_pixel(x0 + y, y0 - x, color);
}
if (cornername & 0x8) {
ssd1306_draw_pixel(x0 - y, y0 + x, color);
ssd1306_draw_pixel(x0 - x, y0 + y, color);
}
if (cornername & 0x1) {
ssd1306_draw_pixel(x0 - y, y0 - x, color);
ssd1306_draw_pixel(x0 - x, y0 - y, color);
}
}
}
void ssd1306_fill_circle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
{
ssd1306_draw_fast_vline(x0, y0 - r, 2 * r + 1, color);
ssd1306_fill_circle_helper(x0, y0, r, 3, 0, color);
}
// Used to do circles and roundrects
void ssd1306_fill_circle_helper(int16_t x0, int16_t y0, int16_t r,
uint8_t cornername, int16_t delta, uint16_t color)
{
int16_t f = 1 - r;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * r;
int16_t x = 0;
int16_t y = r;
while (x < y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
if (cornername & 0x1) {
ssd1306_draw_fast_vline(x0 + x, y0 - y, 2 * y + 1 + delta, color);
ssd1306_draw_fast_vline(x0 + y, y0 - x, 2 * x + 1 + delta, color);
}
if (cornername & 0x2) {
ssd1306_draw_fast_vline(x0 - x, y0 - y, 2 * y + 1 + delta, color);
ssd1306_draw_fast_vline(x0 - y, y0 - x, 2 * x + 1 + delta, color);
}
}
}
// Bresenham's algorithm - thx wikpedia
void ssd1306_draw_line(int16_t x0, int16_t y0,
int16_t x1, int16_t y1,
uint16_t color)
{
int16_t steep = abs(y1 - y0) > abs(x1 - x0);
if (steep) {
adagfxswap(x0, y0);
adagfxswap(x1, y1);
}
if (x0 > x1) {
adagfxswap(x0, x1);
adagfxswap(y0, y1);
}
int16_t dx, dy;
dx = x1 - x0;
dy = abs(y1 - y0);
int16_t err = dx / 2;
int16_t ystep;
if (y0 < y1) {
ystep = 1;
}
else {
ystep = -1;
}
for (; x0 <= x1; x0++) {
if (steep) {
ssd1306_draw_pixel(y0, x0, color);
}
else {
ssd1306_draw_pixel(x0, y0, color);
}