/**
* SSD1306 OLED display driver for esp-open-rtos.
*
* Copyright (c) 2016 urx (https://github.com/urx),
* Ruslan V. Uss (https://github.com/UncleRus)
* Zaltora (https://github.com/Zaltora)
*
* MIT Licensed as described in the file LICENSE
*
* @todo HW scrolling, sprites
*/
#include "ssd1306.h"
#include <stdio.h>
#if (SSD1306_SPI4_SUPPORT) || (SSD1306_SPI3_SUPPORT)
#include <esp/spi.h>
#endif
#include <esp/gpio.h>
#include <FreeRTOS.h>
#include <task.h>
#define SPI_BUS 1
//#define SSD1306_DEBUG
/* SSD1306 commands */
#define SSD1306_SET_MEM_ADDR_MODE (0x20)
#define SSD1306_SET_COL_ADDR (0x21)
#define SSD1306_SET_PAGE_ADDR (0x22)
#define SSD1306_SET_DISP_START_LINE (0x40)
#define SSD1306_SET_CONTRAST (0x81)
#define SSD1306_SET_SEGMENT_REMAP0 (0xA0)
#define SSD1306_SET_SEGMENT_REMAP1 (0xA1)
#define SSD1306_SET_ENTIRE_DISP_ON (0xA5)
#define SSD1306_SET_ENTIRE_DISP_OFF (0xA4)
#define SSD1306_SET_INVERSION_OFF (0xA6)
#define SSD1306_SET_INVERSION_ON (0xA7)
#define SSD1306_SET_MUX_RATIO (0xA8)
#define SSD1306_MUX_RATIO_MASK (0x3F)
#define SSD1306_SET_DISPLAY_OFF (0xAE)
#define SSD1306_SET_DISPLAY_ON (0xAF)
#define SSD1306_SET_SCAN_DIR_FWD (0xC0)
#define SSD1306_SET_SCAN_DIR_BWD (0xC8)
#define SSD1306_SET_DISPLAY_OFFSET (0xD3)
#define SSD1306_SET_OSC_FREQ (0xD5)
#define SSD1306_SET_PRE_CHRG_PER (0xD9)
#define SSD1306_SET_COM_PINS_HW_CFG (0xDA)
#define SSD1306_COM_PINS_HW_CFG_MASK (0x32)
#define SSD1306_SEQ_COM_PINS_CFG (0x02)
#define SSD1306_ALT_COM_PINS_CFG (0x12)
#define SSD1306_COM_LR_REMAP_OFF (0x02)
#define SSD1306_COM_LR_REMAP_ON (0x22)
#define SSD1306_SET_DESEL_LVL (0xDB)
#define SSD1306_SET_NOP (0xE3)
#define SSD1306_SET_CHARGE_PUMP (0x8D)
#define SSD1306_CHARGE_PUMP_EN (0x14)
#define SSD1306_CHARGE_PUMP_DIS (0x10)
#define SSD1306_SCROLL_HOR_LEFT (0x27)
#define SSD1306_SCROLL_HOR_RIGHT (0x26)
#define SSD1306_SCROLL_HOR_VER_LEFT (0x2A)
#define SSD1306_SCROLL_HOR_VER_RIGHT (0x29)
#define SSD1306_SCROLL_ENABLE (0x2F)
#define SSD1306_SCROLL_DISABLE (0x2E)
#define SH1106_SET_CHARGE_PUMP (0xAD)
#define SH1106_CHARGE_PUMP_EN (0x8B)
#define SH1106_CHARGE_PUMP_DIS (0x8A)
#define SH1106_CHARGE_PUMP_VALUE (0x30)
#define SH1106_SET_PAGE_ADDRESS (0xB0)
#define SH1106_SET_LOW_COL_ADDR (0x00)
#define SH1106_SET_HIGH_COL_ADDR (0x10)
#ifdef SSD1306_DEBUG
#define debug(fmt, ...) printf("%s: " fmt "\n", "SSD1306", ## __VA_ARGS__)
#else
#define debug(fmt, ...)
#endif
#define abs(x) ((x)<0 ? -(x) : (x))
#define swap(x, y) do { typeof(x) temp##x##y = x; x = y; y = temp##x##y; } while (0)
#if (SSD1306_I2C_SUPPORT)
static int inline i2c_send(const ssd1306_t *dev, uint8_t reg, uint8_t* data, uint8_t len)
{
return i2c_slave_write(dev->i2c_dev.bus, dev->i2c_dev.addr, ®, data, len);
}
#endif
/* Issue a command to SSD1306 device
* I2C proto format:
* |S|Slave Address|W|ACK|0x00|Command|Ack|P|
*
* in case of two-bytes command here will be Data byte
* right after the command byte.
*/
int ssd1306_command(const ssd1306_t *dev, uint8_t cmd)
{
debug("Command: 0x%02x", cmd);
switch (dev->protocol) {
#if (SSD1306_I2C_SUPPORT)
case SSD1306_PROTO_I2C:
return i2c_send(dev, 0x00, &cmd, 1);
break;
#endif
#if (SSD1306_SPI4_SUPPORT)
case SSD1306_PROTO_SPI4:
gpio_write(dev->dc_pin, false); // command mode
gpio_write(dev->cs_pin, false);
spi_transfer_8(SPI_BUS, cmd);
gpio_write(dev->cs_pin, true);
break;
#endif
#if (SSD1306_SPI3_SUPPORT)
case SSD1306_PROTO_SPI3:
gpio_write(dev->cs_pin, false);
spi_set_command(SPI_BUS, 1, 0); // command mode
spi_transfer_8(SPI_BUS, cmd);
spi_clear_command(SPI_BUS);
gpio_write(dev->cs_pin, true);
break;
#endif
default:
debug("Unsupported protocol");
return -EPROTONOSUPPORT;
}
return 0;
}
/* Perform default init routine according
* to SSD1306 datasheet from adafruit.com */
int ssd1306_init(const ssd1306_t *dev)
{
uint8_t pin_cfg;
switch (dev->height) {
case 16:
case 32:
pin_cfg = 0x02;
break;
case 48:
case 64:
pin_cfg = 0x12;
break;
default:
debug("Unsupported screen height");
return -ENOTSUP;
}
switch (dev->protocol) {
#if (SSD1306_I2C_SUPPORT)
case SSD1306_PROTO_I2C:
break;
#endif
#if (SSD1306_SPI4_SUPPORT)
case SSD1306_PROTO_SPI4:
gpio_enable(dev->cs_pin, GPIO_OUTPUT);
gpio_write(dev->cs_pin, true);
gpio_enable(dev->dc_pin, GPIO_OUTPUT);
spi_init(SPI_BUS, SPI_MODE0, SPI_FREQ_DIV_8M, true, SPI_LITTLE_ENDIAN, true);
break;
#endif
#if (SSD1306_SPI3_SUPPORT)
case SSD1306_PROTO_SPI3:
gpio_enable(dev->cs_pin, GPIO_OUTPUT);
gpio_write(dev->cs_pin, true);
spi_init(SPI_BUS, SPI_MODE0, SPI_FREQ_DIV_8M, true, SPI_LITTLE_ENDIAN, true);
break;
#endif
default:
debug("Unsupported protocol");
return -EPROTONOSUPPORT;
}
switch (dev->screen) {
case SSD1306_SCREEN:
if (!ssd1306_display_on(dev, false) &&
!ssd1306_set_osc_freq(dev, 0x80) &&
!ssd1306_set_mux_ratio(dev, dev->height - 1) &&
!ssd1306_set_display_offset(dev, 0x0) &&
!ssd1306_set_display_start_line(dev, 0x0) &&
!ssd1306_set_charge_pump_enabled(dev, true) &&
!ssd1306_set_mem_addr_mode(dev, SSD1306_ADDR_MODE_HORIZONTAL) &&
!ssd1306_set_segment_remapping_enabled(dev, false) &&
!ssd1306_set_scan_direction_fwd(dev, true) &&
!ssd1306_set_com_pin_hw_config(dev, pin_cfg) &&
!ssd1306_set_contrast(dev, 0x9f) &&
!ssd1306_set_precharge_period(dev, 0xf1) &&
!ssd1306_set_deseltct_lvl(dev, 0x40) &&
!ssd1306_set_whole_display_lighting(dev, true) &&
!ssd1306_set_inversion(dev, false) &&
!ssd1306_display_on(dev, true)) {
return 0;
}
break;
case SH1106_SCREEN:
if (!ssd1306_display_on(dev, false) &&
!ssd1306_set_charge_pump_enabled(dev, true) &&
!sh1106_set_charge_pump_voltage(dev,SH1106_VOLTAGE_74) &&
!ssd1306_set_osc_freq(dev, 0x80) &&
!ssd1306_set_mux_ratio(dev, dev->height - 1) &&
!ssd1306_set_display_offset(dev, 0x0) &&
!ssd1306_set_display_start_line(dev, 0x0) &&
!ssd1306_set_segment_remapping_enabled(dev, true) &&
!ssd1306_set_scan_direction_fwd(dev, true) &&
!ssd1306_set_com_pin_hw_config(dev, pin_cfg) &&
!ssd1306_set_contrast(dev, 0x9f) &&
!ssd1306_set_precharge_period(dev, 0xf1) &&
!ssd1306_set_deseltct_lvl(dev, 0x40) &&
!ssd1306_set_whole_display_lighting(dev, true) &&
!ssd1306_set_inversion(dev, false) &&
!ssd1306_display_on(dev, true)) {
return 0;
}
break;
}
return -EIO;
}
static int sh1106_go_coordinate(const ssd1306_t *dev, uint8_t x, uint8_t y)
{
if (x >= dev->width || y >= (dev->height / 8))
return -EINVAL;
int err = 0;
x += 2; //offset : panel is 128 ; RAM is 132 for sh1106
if ((err = ssd1306_command(dev, SH1106_SET_PAGE_ADDRESS + y))) // Set row
return err;
if ((err = ssd1306_command(dev, SH1106_SET_LOW_COL_ADDR | (x & 0xf)))) // Set lower column address
return err;
return ssd1306_command(dev, SH1106_SET_HIGH_COL_ADDR | (x >> 4)); //Set higher column address
}
int ssd1306_load_frame_buffer(const ssd1306_t *dev, uint8_t buf[])
{
uint16_t i;
#if (SSD1306_SPI3_SUPPORT)
uint8_t j;
#endif
#if (SSD1306_I2C_SUPPORT)
uint8_t tab[16] = { 0 };
#endif
size_t len = dev->width * dev->height / 8;
if (dev->screen == SSD1306_SCREEN) {
if (dev->width == 64 && dev->height == 48)
ssd1306_set_column_addr(dev, 32, 32 + dev->width -1);
else
ssd1306_set_column_addr(dev, 0, dev->width - 1);
ssd1306_set_page_addr(dev, 0, dev->height / 8 - 1);
}
switch (dev->protocol) {
#if (SSD1306_I2C_SUPPORT)
case SSD1306_PROTO_I2C:
for (i = 0; i < len; i++) {
if (dev->screen == SH1106_SCREEN && i % dev->width == 0)
sh1106_go_coordinate(dev, 0, i / dev->width);
i2c_send(dev, 0x40, buf ? &buf[i] : tab, 16);
i += 15;
}
break;
#endif
#if (SSD1306_SPI4_SUPPORT)
case SSD1306_PROTO_SPI4:
gpio_write(dev->cs_pin, false);
if (dev->screen == SSD1306_SCREEN) {
gpio_write(dev->dc_pin, true); // data mode
if (buf)
spi_transfer(SPI_BUS, buf, NULL, len, SPI_8BIT);
else
spi_repeat_send_8(SPI_BUS, 0, len);
}
else {
for (i = 0; i < (dev->height / 8); i++) {
sh1106_go_coordinate(dev, 0, i);
gpio_write(dev->dc_pin, true); // data mode
gpio_write(dev->cs_pin, false);
if (buf)
spi_transfer(SPI_BUS, &buf[dev->width * i], NULL, dev->width, SPI_8BIT);
else
spi_repeat_send_8(SPI_BUS, 0, dev->width);
}
}
gpio_write(dev->cs_pin, true);
break;
#endif
#if (SSD1306_SPI3_SUPPORT)
case SSD1306_PROTO_SPI3:
gpio_write(dev->cs_pin, false);
if (dev->screen == SSD1306_SCREEN) {
spi_set_command(SPI_BUS, 1, 1); // data mode
if (buf) {
for (i = 0; i < len; i++) {
spi_transfer(SPI_BUS, &buf[i], NULL, 1, SPI_8BIT);
}
}
else {
for (i = 0; i < len; i++) {
spi_transfer_8(SPI_BUS, 0);
}
}
}
else {
for (i = 0; i < (dev->height / 8); i++) {
sh1106_go_coordinate(dev, 0, i);
spi_set_command(SPI_BUS, 1, 1); // data mode
gpio_write(dev->cs_pin, false);
if (buf)
for (j = 0; j < dev->width; j++)
spi_transfer_8(SPI_BUS, buf[dev->width * i + j]);
else
for (j = 0; j < dev->width; j++)
spi_transfer_8(SPI_BUS, buf[dev->width * i + j]);
}
}
spi_clear_command(SPI_BUS);
gpio_write(dev->cs_pin, true);
break;
#endif
default:
debug("Unsupported protocol");
return -EPROTONOSUPPORT;
}
return 0;
}
int ssd1306_display_on(const ssd1306_t *dev, bool on)
{
return ssd1306_command(dev, on ? SSD1306_SET_DISPLAY_ON : SSD1306_SET_DISPLAY_OFF);
}
int ssd1306_set_display_start_line(const ssd1306_t *dev, uint8_t start)
{
if (start > 63)
return -EINVAL;
return ssd1306_command(dev, SSD1306_SET_DISP_START_LINE | start);
}
int ssd1306_set_display_offset(const ssd1306_t *dev, uint8_t offset)
{
if (offset > 63)
return -EINVAL;
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_DISPLAY_OFFSET)))
return err;
return ssd1306_command(dev, offset);
}
int sh1106_set_charge_pump_voltage(const ssd1306_t *dev, sh1106_voltage_t select)
{
if (dev->screen == SSD1306_SCREEN) {
debug("Unsupported screen type");
return -ENOTSUP;
}
return ssd1306_command(dev, select | SH1106_CHARGE_PUMP_VALUE);
}
int ssd1306_set_charge_pump_enabled(const ssd1306_t *dev, bool enabled)
{
int err = 0;
switch (dev->screen) {
case SH1106_SCREEN:
if ((err = ssd1306_command(dev, SH1106_SET_CHARGE_PUMP)))
return err;
return ssd1306_command(dev, enabled ? SH1106_CHARGE_PUMP_EN : SH1106_CHARGE_PUMP_DIS);
break;
case SSD1306_SCREEN:
if ((err = ssd1306_command(dev, SSD1306_SET_CHARGE_PUMP)))
return err;
return ssd1306_command(dev, enabled ? SSD1306_CHARGE_PUMP_EN : SSD1306_CHARGE_PUMP_DIS);
break;
default:
debug("Unsupported screen type");
return -ENOTSUP;
}
}
int ssd1306_set_mem_addr_mode(const ssd1306_t *dev, ssd1306_mem_addr_mode_t mode)
{
if (dev->screen == SH1106_SCREEN) {
debug("Unsupported screen type");
return -ENOTSUP;
}
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_MEM_ADDR_MODE)))
return err;
return ssd1306_command(dev, mode);
}
int ssd1306_set_segment_remapping_enabled(const ssd1306_t *dev, bool on)
{
return ssd1306_command(dev, on ? SSD1306_SET_SEGMENT_REMAP1 : SSD1306_SET_SEGMENT_REMAP0);
}
int ssd1306_set_scan_direction_fwd(const ssd1306_t *dev, bool fwd)
{
return ssd1306_command(dev, fwd ? SSD1306_SET_SCAN_DIR_FWD : SSD1306_SET_SCAN_DIR_BWD);
}
int ssd1306_set_com_pin_hw_config(const ssd1306_t *dev, uint8_t config)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_COM_PINS_HW_CFG)))
return err;
return ssd1306_command(dev, config & SSD1306_COM_PINS_HW_CFG_MASK);
}
int ssd1306_set_contrast(const ssd1306_t *dev, uint8_t contrast)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_CONTRAST)))
return err;
return ssd1306_command(dev, contrast);
}
int ssd1306_set_inversion(const ssd1306_t *dev, bool on)
{
return ssd1306_command(dev, on ? SSD1306_SET_INVERSION_ON : SSD1306_SET_INVERSION_OFF);
}
int ssd1306_set_osc_freq(const ssd1306_t *dev, uint8_t osc_freq)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_OSC_FREQ)))
return err;
return ssd1306_command(dev, osc_freq);
}
int ssd1306_set_mux_ratio(const ssd1306_t *dev, uint8_t ratio)
{
if (ratio < 15 || ratio > 63)
return -EINVAL;
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_MUX_RATIO)))
return err;
return ssd1306_command(dev, ratio);
}
int ssd1306_set_column_addr(const ssd1306_t *dev, uint8_t start, uint8_t stop)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_COL_ADDR)))
return err;
if ((err = ssd1306_command(dev, start)))
return err;
return ssd1306_command(dev, stop);
}
int ssd1306_set_page_addr(const ssd1306_t *dev, uint8_t start, uint8_t stop)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_PAGE_ADDR)))
return err;
if ((err = ssd1306_command(dev, start)))
return err;
return ssd1306_command(dev, stop);
}
int ssd1306_set_precharge_period(const ssd1306_t *dev, uint8_t prchrg)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_PRE_CHRG_PER)))
return err;
return ssd1306_command(dev, prchrg);
}
int ssd1306_set_deseltct_lvl(const ssd1306_t *dev, uint8_t lvl)
{
int err = 0;
if ((err = ssd1306_command(dev, SSD1306_SET_DESEL_LVL)))
return err;
return ssd1306_command(dev, lvl);
}
int ssd1306_set_whole_display_lighting(const ssd1306_t *dev, bool light)
{
return ssd1306_command(dev, light ? SSD1306_SET_ENTIRE_DISP_ON : SSD1306_SET_ENTIRE_DISP_OFF);
}
/* one byte of xbm - 8 dots in line of picture source
* one byte of fb - 8 rows for 1 column of screen
*/
int ssd1306_load_xbm(const ssd1306_t *dev, uint8_t *xbm, uint8_t *fb)
{
uint8_t bit = 0;
int row = 0;
int column = 0;
for (row = 0; row < dev->height; row++) {
for (column = 0; column < dev->width / 8; column++) {
uint16_t xbm_offset = row * 16 + column;
for (bit = 0; bit < 8; bit++) {
if (*(xbm + xbm_offset) & 1 << bit) {
*(fb + dev->width * (row / 8) + column * 8 + bit) |= 1 << row % 8;
}
}
}
}
return ssd1306_load_frame_buffer(dev, fb);
}
int ssd1306_draw_pixel(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, ssd1306_color_t color)
{
uint16_t index;
if ((x >= dev->width) || (x < 0) || (y >= dev->height) || (y < 0))
return -EINVAL;
index = x + (y / 8) * dev->width;
switch (color) {
case OLED_COLOR_WHITE:
fb[index] |= (1 << (y & 7));
break;
case OLED_COLOR_BLACK:
fb[index] &= ~(1 << (y & 7));
break;
case OLED_COLOR_INVERT:
fb[index] ^= (1 << (y & 7));
break;
default:
break;
}
return 0;
}
int ssd1306_draw_hline(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, uint8_t w, ssd1306_color_t color)
{
uint16_t index;
uint8_t mask, t;
// boundary check
if ((x >= dev->width) || (x < 0) || (y >= dev->height) || (y < 0))
return -EINVAL;
if (w == 0)
return -EINVAL;
if (x + w > dev->width)
w = dev->width - x;
t = w;
index = x + (y / 8) * dev->width;
mask = 1 << (y & 7);
switch (color) {
case OLED_COLOR_WHITE:
while (t--) {
fb[index] |= mask;
++index;
}
break;
case OLED_COLOR_BLACK:
mask = ~mask;
while (t--) {
fb[index] &= mask;
++index;
}
break;
case OLED_COLOR_INVERT:
while (t--) {
fb[index] ^= mask;
++index;
}
break;
default:
break;
}
return 0;
}
int ssd1306_draw_vline(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, uint8_t h, ssd1306_color_t color)
{
uint16_t index;
uint8_t fill, mask, mod;
// boundary check
if ((x >= dev->width) || (x < 0) || (y >= dev->height) || (y < 0))
return -EINVAL;
if (h == 0)
return -EINVAL;
if (y + h > dev->height)
h = dev->height - y;
do {
mod = y & 7;
fill = 8 - mod;
if (fill > h)
fill = h;
index = x + (y / 8) * dev->width;
mask = ((1 << fill) - 1) << mod;
switch (color) {
case OLED_COLOR_WHITE:
fb[index] |= mask;
break;
case OLED_COLOR_BLACK:
fb[index] &= ~mask;
break;
case OLED_COLOR_INVERT:
fb[index] ^= mask;
break;
default:
break;
}
y += fill;
h -= fill;
} while(h > 0);
return 0;
}
int ssd1306_draw_rectangle(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, uint8_t w, uint8_t h, ssd1306_color_t color)
{
int err = 0;
if ((err = ssd1306_draw_hline(dev, fb, x, y, w, color)))
return err;
if ((err = ssd1306_draw_hline(dev, fb, x, y + h - 1, w, color)))
return err;
if ((err = ssd1306_draw_vline(dev, fb, x, y, h, color)))
return err;
return ssd1306_draw_vline(dev, fb, x + w - 1, y, h, color);
}
int ssd1306_fill_rectangle(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, uint8_t w, uint8_t h, ssd1306_color_t color)
{
uint16_t index;
uint8_t fill, mask, mod, t;
// boundary check
if ((x >= dev->width) || (x < 0) || (y >= dev->height) || (y < 0))
return -EINVAL;
if (w == 0 || h == 0)
return -EINVAL;
if (x + w > dev->width)
w = dev->width - x;
if (y + h > dev->height)
h = dev->height - y;
do {
mod = y & 7;
fill = 8 - mod;
if (fill > h)
fill = h;
t = w;
index = x + (y / 8) * dev->width;
mask = ((1 << fill) - 1) << mod;
switch (color) {
case OLED_COLOR_WHITE:
while (t--) {
fb[index] |= mask;
++index;
}
break;
case OLED_COLOR_BLACK:
mask = ~mask;
while (t--) {
fb[index] &= mask;
++index;
}
break;
case OLED_COLOR_INVERT:
while (t--) {
fb[index] ^= mask;
++index;
}
break;
default:
break;
}
y += fill;
h -= fill;
} while(h > 0);
return 0;
}
int ssd1306_draw_circle(const ssd1306_t *dev, uint8_t *fb, int8_t x0, int8_t y0, uint8_t r, ssd1306_color_t color)
{
// Refer to http://en.wikipedia.org/wiki/Midpoint_circle_algorithm for the algorithm
int8_t x = r;
int8_t y = 1;
int16_t radius_err = 1 - x;
int err = 0;
if (r == 0)
return -EINVAL;
if ((err = ssd1306_draw_pixel(dev, fb, x0 - r, y0, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 + r, y0, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0, y0 - r, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0, y0 + r, color)))
return err;
while (x >= y) {
if ((err = ssd1306_draw_pixel(dev, fb, x0 + x, y0 + y, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 - x, y0 + y, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 + x, y0 - y, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 - x, y0 - y, color)))
return err;
if (x != y) {
/* Otherwise the 4 drawings below are the same as above, causing
* problem when color is INVERT
*/
if ((err = ssd1306_draw_pixel(dev, fb, x0 + y, y0 + x, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 - y, y0 + x, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 + y, y0 - x, color)))
return err;
if ((err = ssd1306_draw_pixel(dev, fb, x0 - y, y0 - x, color)))
return err;
}
++y;
if (radius_err < 0) {
radius_err += 2 * y + 1;
}
else {
--x;
radius_err += 2 * (y - x + 1);
}
}
return 0;
}
int ssd1306_fill_circle(const ssd1306_t *dev, uint8_t *fb, int8_t x0, int8_t y0, uint8_t r, ssd1306_color_t color)
{
int8_t x = 1;
int8_t y = r;
int16_t radius_err = 1 - y;
int8_t x1;
int err = 0;
if (r == 0)
return -EINVAL;
if ((err = ssd1306_draw_vline(dev, fb, x0, y0 - r, 2 * r + 1, color))) // Center vertical line
return err;
while (y >= x) {
if ((err = ssd1306_draw_vline(dev, fb, x0 - x, y0 - y, 2 * y + 1, color)))
return err;
if ((err = ssd1306_draw_vline(dev, fb, x0 + x, y0 - y, 2 * y + 1, color)))
return err;
if (color != OLED_COLOR_INVERT) {
if ((err = ssd1306_draw_vline(dev, fb, x0 - y, y0 - x, 2 * x + 1, color)))
return err;
if ((err = ssd1306_draw_vline(dev, fb, x0 + y, y0 - x, 2 * x + 1, color)))
return err;
}
++x;
if (radius_err < 0) {
radius_err += 2 * x + 1;
}
else {
--y;
radius_err += 2 * (x - y + 1);
}
}
if (color == OLED_COLOR_INVERT) {
x1 = x; // Save where we stopped
y = 1;
x = r;
radius_err = 1 - x;
if ((err = ssd1306_draw_hline(dev, fb, x0 + x1, y0, r - x1 + 1, color)))
return err;
if ((err = ssd1306_draw_hline(dev, fb, x0 - r, y0, r - x1 + 1, color)))
return err;
while (x >= y) {
if ((err = ssd1306_draw_hline(dev, fb, x0 + x1, y0 - y, x - x1 + 1, color)))
return err;
if ((err = ssd1306_draw_hline(dev, fb, x0 + x1, y0 + y, x - x1 + 1, color)))
return err;
if ((err = ssd1306_draw_hline(dev, fb, x0 - x, y0 - y, x - x1 + 1, color)))
return err;
if ((err = ssd1306_draw_hline(dev, fb, x0 - x, y0 + y, x - x1 + 1, color)))
return err;
++y;
if (radius_err < 0) {
radius_err += 2 * y + 1;
}
else {
--x;
radius_err += 2 * (y - x + 1);
}
}
}
return 0;
}
int ssd1306_draw_line(const ssd1306_t *dev, uint8_t *fb, int16_t x0, int16_t y0, int16_t x1, int16_t y1, ssd1306_color_t color)
{
if ((x0 >= dev->width) || (x0 < 0) || (y0 >= dev->height) || (y0 < 0))
return -EINVAL;
if ((x1 >= dev->width) || (x1 < 0) || (y1 >= dev->height) || (y1 < 0))
return -EINVAL;
int err;
bool steep = abs(y1 - y0) > abs(x1 - x0);
if (steep) {
swap(x0, y0);
swap(x1, y1);
}
if (x0 > x1) {
swap(x0, x1);
swap(y0, y1);
}
int16_t dx, dy;
dx = x1 - x0;
dy = abs(y1 - y0);
int16_t errx = dx / 2;
int16_t ystep;
if (y0 < y1) {
ystep = 1;
}
else {
ystep = -1;
}
for (; x0 <= x1; x0++) {
if (steep) {
if ((err = ssd1306_draw_pixel(dev, fb, y0, x0, color)))
return err;
}
else {
if ((err = ssd1306_draw_pixel(dev, fb, x0, y0, color)))
return err;
}
errx -= dy;
if (errx < 0) {
y0 += ystep;
errx += dx;
}
}
return 0;
}
int ssd1306_draw_triangle(const ssd1306_t *dev, uint8_t *fb, int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2,
ssd1306_color_t color)
{
int err;
if ((err = ssd1306_draw_line(dev, fb, x0, y0, x1, y1, color)))
return err;
if ((err = ssd1306_draw_line(dev, fb, x1, y1, x2, y2, color)))
return err;
return ssd1306_draw_line(dev, fb, x2, y2, x0, y0, color);
}
int ssd1306_fill_triangle(const ssd1306_t *dev, uint8_t *fb, int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2,
ssd1306_color_t color)
{
int16_t a, b, y, last;
int err;
// Sort coordinates by Y order (y2 >= y1 >= y0)
if (y0 > y1) {
swap(y0, y1);swap(x0, x1);
}
if (y1 > y2) {
swap(y2, y1);swap(x2, x1);
}
if (y0 > y1) {
swap(y0, y1);swap(x0, x1);
}
if (y0 == y2) { // Handle awkward all-on-same-line case as its own thing
a = b = x0;
if (x1 < a) a = x1;
else if (x1 > b) b = x1;
if (x2 < a) a = x2;
else if (x2 > b) b = x2;
if ((err = ssd1306_draw_hline(dev, fb, a, y0, b - a + 1, color)))
return err;
return 0;
}
int16_t
dx01 = x1 - x0,
dy01 = y1 - y0,
dx02 = x2 - x0,
dy02 = y2 - y0,
dx12 = x2 - x1,
dy12 = y2 - y1,
sa = 0,
sb = 0;
// For upper part of triangle, find scanline crossings for segments
// 0-1 and 0-2. If y1=y2 (flat-bottomed triangle), the scanline y1
// is included here (and second loop will be skipped, avoiding a /0
// error there), otherwise scanline y1 is skipped here and handled
// in the second loop...which also avoids a /0 error here if y0=y1
// (flat-topped triangle).
if (y1 == y2) last = y1; // Include y1 scanline
else last = y1 - 1; // Skip it
for (y = y0; y <= last; y++) {
a = x0 + sa / dy01;
b = x0 + sb / dy02;
sa += dx01;
sb += dx02;
/* longhand:
a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
*/
if (a > b) swap(a, b);
if ((err = ssd1306_draw_hline(dev, fb, a, y, b - a + 1, color)))
return err;
}
// For lower part of triangle, find scanline crossings for segments
// 0-2 and 1-2. This loop is skipped if y1=y2.
sa = dx12 * (y - y1);
sb = dx02 * (y - y0);
for (; y <= y2; y++) {
a = x1 + sa / dy12;
b = x0 + sb / dy02;
sa += dx12;
sb += dx02;
/* longhand:
a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
*/
if (a > b) swap(a, b);
if ((err = ssd1306_draw_hline(dev, fb, a, y, b - a + 1, color)))
return err;
}
return 0;
}
int ssd1306_draw_char(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font, uint8_t x, uint8_t y, char c, ssd1306_color_t foreground,
ssd1306_color_t background)
{
uint8_t i, j;
const uint8_t *bitmap;
uint8_t line = 0;
int err;
if (font == NULL)
return 0;
const font_char_desc_t *d = font_get_char_desc(font, c);
if (d == NULL)
return 0;
bitmap = font->bitmap + d->offset;
for (j = 0; j < font->height; ++j) {
for (i = 0; i < d->width; ++i) {
if (i % 8 == 0) {
line = bitmap[(d->width + 7) / 8 * j + i / 8]; // line data
}
if (line & 0x80) {
err = ssd1306_draw_pixel(dev, fb, x + i, y + j, foreground);
}
else {
switch (background) {
case OLED_COLOR_TRANSPARENT:
// Not drawing for transparent background
break;
case OLED_COLOR_WHITE:
case OLED_COLOR_BLACK:
err = ssd1306_draw_pixel(dev, fb, x + i, y + j, background);
break;
case OLED_COLOR_INVERT:
// I don't know why I need invert background
break;
}
}
if (err)
return -ERANGE;
line = line << 1;
}
}
return d->width;
}
int ssd1306_draw_string(const ssd1306_t *dev, uint8_t *fb, const font_info_t *font, uint8_t x, uint8_t y, const char *str,
ssd1306_color_t foreground, ssd1306_color_t background)
{
uint8_t t = x;
int err;
if (font == NULL || str == NULL)
return 0;
while (*str) {
if ((err = ssd1306_draw_char(dev, fb, font, x, y, *str, foreground, background)) < 0)
return err;
x += err;
++str;
if (*str)
x += font->c;
}
return x - t;
}
int ssd1306_stop_scroll(const ssd1306_t *dev)
{
return ssd1306_command(dev, SSD1306_SCROLL_DISABLE);
}
int ssd1306_start_scroll_hori(const ssd1306_t *dev, bool way, uint8_t start, uint8_t stop, ssd1306_scroll_t frame)
{
int err;
if (way) {
if ((err = ssd1306_command(dev, SSD1306_SCROLL_HOR_LEFT)))
return err;
}
else {
if ((err = ssd1306_command(dev, SSD1306_SCROLL_HOR_RIGHT)))
return err;
}
if (!ssd1306_command(dev, 0x00) && //dummy
!ssd1306_command(dev, (start&0x07)) &&
!ssd1306_command(dev, frame) &&
!ssd1306_command(dev, (stop&0x07)) &&
!ssd1306_command(dev, 0x00) && //dummy
!ssd1306_command(dev, 0xFF) && //dummy
!ssd1306_command(dev, SSD1306_SCROLL_ENABLE)) {
return 0;
}
return -EIO;
}
int ssd1306_start_scroll_hori_vert(const ssd1306_t *dev, bool way, uint8_t start, uint8_t stop, uint8_t dy, ssd1306_scroll_t frame)
{
//this function dont work well if no vertical setting.
if ((!dy) || (dy > 63))
return -EINVAL;
int err;
//vertical scrolling selection (all screen)
if ((err = ssd1306_command(dev, 0xA3)))
return err;
if ((err = ssd1306_command(dev, 0)))
return err;
if ((err = ssd1306_command(dev, dev->height)))
return err;
if (way) {
if ((err = ssd1306_command(dev, SSD1306_SCROLL_HOR_VER_LEFT)))
return err;
}
else {
if ((err = ssd1306_command(dev, SSD1306_SCROLL_HOR_VER_RIGHT)))
return err;
}
if (!ssd1306_command(dev, 0x00) && //dummy
!ssd1306_command(dev, (start&0x07)) &&
!ssd1306_command(dev, frame) &&
!ssd1306_command(dev, (stop&0x07)) &&
!ssd1306_command(dev, dy) &&
!ssd1306_command(dev, SSD1306_SCROLL_ENABLE)) {
return 0;
}
return -EIO;
}