[Core] Refactor OLED to allow easy addition of other types (#13454)

* add docs

* core changes

* update keyboards to new OLED

* updated users to new OLED

* update layouts to new OLED

* fixup docs

* drashna's suggestion

* fix up docs

* new keyboards with oled

* core split changes

* remaining keyboard files

* Fix The Helix keyboards oled options

* reflect develop

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: mtei <2170248+mtei@users.noreply.github.com>

1 files changed, 777 insertions, 0 deletions

diff --git a/drivers/oled/ssd1306_sh1106.c b/drivers/oled/ssd1306_sh1106.c
new file mode 100644
index 0000000000..7d41978905
--- /dev/null
+++ b/drivers/oled/ssd1306_sh1106.c
@@ -0,0 +1,777 @@
+/*
+Copyright 2019 Ryan Caltabiano <https://github.com/XScorpion2>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "i2c_master.h"
+#include "oled_driver.h"
+#include OLED_FONT_H
+#include "timer.h"
+#include "print.h"
+
+#include <string.h>
+
+#include "progmem.h"
+
+#include "keyboard.h"
+
+// Used commands from spec sheet: https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
+// for SH1106: https://www.velleman.eu/downloads/29/infosheets/sh1106_datasheet.pdf
+
+// Fundamental Commands
+#define CONTRAST 0x81
+#define DISPLAY_ALL_ON 0xA5
+#define DISPLAY_ALL_ON_RESUME 0xA4
+#define NORMAL_DISPLAY 0xA6
+#define INVERT_DISPLAY 0xA7
+#define DISPLAY_ON 0xAF
+#define DISPLAY_OFF 0xAE
+#define NOP 0xE3
+
+// Scrolling Commands
+#define ACTIVATE_SCROLL 0x2F
+#define DEACTIVATE_SCROLL 0x2E
+#define SCROLL_RIGHT 0x26
+#define SCROLL_LEFT 0x27
+#define SCROLL_RIGHT_UP 0x29
+#define SCROLL_LEFT_UP 0x2A
+
+// Addressing Setting Commands
+#define MEMORY_MODE 0x20
+#define COLUMN_ADDR 0x21
+#define PAGE_ADDR 0x22
+#define PAM_SETCOLUMN_LSB 0x00
+#define PAM_SETCOLUMN_MSB 0x10
+#define PAM_PAGE_ADDR 0xB0  // 0xb0 -- 0xb7
+
+// Hardware Configuration Commands
+#define DISPLAY_START_LINE 0x40
+#define SEGMENT_REMAP 0xA0
+#define SEGMENT_REMAP_INV 0xA1
+#define MULTIPLEX_RATIO 0xA8
+#define COM_SCAN_INC 0xC0
+#define COM_SCAN_DEC 0xC8
+#define DISPLAY_OFFSET 0xD3
+#define COM_PINS 0xDA
+#define COM_PINS_SEQ 0x02
+#define COM_PINS_ALT 0x12
+#define COM_PINS_SEQ_LR 0x22
+#define COM_PINS_ALT_LR 0x32
+
+// Timing & Driving Commands
+#define DISPLAY_CLOCK 0xD5
+#define PRE_CHARGE_PERIOD 0xD9
+#define VCOM_DETECT 0xDB
+
+// Advance Graphic Commands
+#define FADE_BLINK 0x23
+#define ENABLE_FADE 0x20
+#define ENABLE_BLINK 0x30
+
+// Charge Pump Commands
+#define CHARGE_PUMP 0x8D
+
+// Misc defines
+#ifndef OLED_BLOCK_COUNT
+#    define OLED_BLOCK_COUNT (sizeof(OLED_BLOCK_TYPE) * 8)
+#endif
+#ifndef OLED_BLOCK_SIZE
+#    define OLED_BLOCK_SIZE (OLED_MATRIX_SIZE / OLED_BLOCK_COUNT)
+#endif
+
+#define OLED_ALL_BLOCKS_MASK (((((OLED_BLOCK_TYPE)1 << (OLED_BLOCK_COUNT - 1)) - 1) << 1) | 1)
+
+// i2c defines
+#define I2C_CMD 0x00
+#define I2C_DATA 0x40
+#if defined(__AVR__)
+#    define I2C_TRANSMIT_P(data) i2c_transmit_P((OLED_DISPLAY_ADDRESS << 1), &data[0], sizeof(data), OLED_I2C_TIMEOUT)
+#else  // defined(__AVR__)
+#    define I2C_TRANSMIT_P(data) i2c_transmit((OLED_DISPLAY_ADDRESS << 1), &data[0], sizeof(data), OLED_I2C_TIMEOUT)
+#endif  // defined(__AVR__)
+#define I2C_TRANSMIT(data) i2c_transmit((OLED_DISPLAY_ADDRESS << 1), &data[0], sizeof(data), OLED_I2C_TIMEOUT)
+#define I2C_WRITE_REG(mode, data, size) i2c_writeReg((OLED_DISPLAY_ADDRESS << 1), mode, data, size, OLED_I2C_TIMEOUT)
+
+#define HAS_FLAGS(bits, flags) ((bits & flags) == flags)
+
+// Display buffer's is the same as the OLED memory layout
+// this is so we don't end up with rounding errors with
+// parts of the display unusable or don't get cleared correctly
+// and also allows for drawing & inverting
+uint8_t         oled_buffer[OLED_MATRIX_SIZE];
+uint8_t *       oled_cursor;
+OLED_BLOCK_TYPE oled_dirty          = 0;
+bool            oled_initialized    = false;
+bool            oled_active         = false;
+bool            oled_scrolling      = false;
+bool            oled_inverted       = false;
+uint8_t         oled_brightness     = OLED_BRIGHTNESS;
+oled_rotation_t oled_rotation       = 0;
+uint8_t         oled_rotation_width = 0;
+uint8_t         oled_scroll_speed   = 0;  // this holds the speed after being remapped to ssd1306 internal values
+uint8_t         oled_scroll_start   = 0;
+uint8_t         oled_scroll_end     = 7;
+#if OLED_TIMEOUT > 0
+uint32_t oled_timeout;
+#endif
+#if OLED_SCROLL_TIMEOUT > 0
+uint32_t oled_scroll_timeout;
+#endif
+#if OLED_UPDATE_INTERVAL > 0
+uint16_t oled_update_timeout;
+#endif
+
+// Internal variables to reduce math instructions
+
+#if defined(__AVR__)
+// identical to i2c_transmit, but for PROGMEM since all initialization is in PROGMEM arrays currently
+// probably should move this into i2c_master...
+static i2c_status_t i2c_transmit_P(uint8_t address, const uint8_t *data, uint16_t length, uint16_t timeout) {
+    i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+
+    for (uint16_t i = 0; i < length && status >= 0; i++) {
+        status = i2c_write(pgm_read_byte((const char *)data++), timeout);
+        if (status) break;
+    }
+
+    i2c_stop();
+
+    return status;
+}
+#endif
+
+// Flips the rendering bits for a character at the current cursor position
+static void InvertCharacter(uint8_t *cursor) {
+    const uint8_t *end = cursor + OLED_FONT_WIDTH;
+    while (cursor < end) {
+        *cursor = ~(*cursor);
+        cursor++;
+    }
+}
+
+bool oled_init(oled_rotation_t rotation) {
+#if defined(USE_I2C) && defined(SPLIT_KEYBOARD)
+    if (!is_keyboard_master()) {
+        return true;
+    }
+#endif
+
+    oled_rotation = oled_init_user(rotation);
+    if (!HAS_FLAGS(oled_rotation, OLED_ROTATION_90)) {
+        oled_rotation_width = OLED_DISPLAY_WIDTH;
+    } else {
+        oled_rotation_width = OLED_DISPLAY_HEIGHT;
+    }
+    i2c_init();
+
+    static const uint8_t PROGMEM display_setup1[] = {
+        I2C_CMD,
+        DISPLAY_OFF,
+        DISPLAY_CLOCK,
+        0x80,
+        MULTIPLEX_RATIO,
+        OLED_DISPLAY_HEIGHT - 1,
+        DISPLAY_OFFSET,
+        0x00,
+        DISPLAY_START_LINE | 0x00,
+        CHARGE_PUMP,
+        0x14,
+#if (OLED_IC != OLED_IC_SH1106)
+        // MEMORY_MODE is unsupported on SH1106 (Page Addressing only)
+        MEMORY_MODE,
+        0x00,  // Horizontal addressing mode
+#endif
+    };
+    if (I2C_TRANSMIT_P(display_setup1) != I2C_STATUS_SUCCESS) {
+        print("oled_init cmd set 1 failed\n");
+        return false;
+    }
+
+    if (!HAS_FLAGS(oled_rotation, OLED_ROTATION_180)) {
+        static const uint8_t PROGMEM display_normal[] = {I2C_CMD, SEGMENT_REMAP_INV, COM_SCAN_DEC};
+        if (I2C_TRANSMIT_P(display_normal) != I2C_STATUS_SUCCESS) {
+            print("oled_init cmd normal rotation failed\n");
+            return false;
+        }
+    } else {
+        static const uint8_t PROGMEM display_flipped[] = {I2C_CMD, SEGMENT_REMAP, COM_SCAN_INC};
+        if (I2C_TRANSMIT_P(display_flipped) != I2C_STATUS_SUCCESS) {
+            print("display_flipped failed\n");
+            return false;
+        }
+    }
+
+    static const uint8_t PROGMEM display_setup2[] = {I2C_CMD, COM_PINS, OLED_COM_PINS, CONTRAST, OLED_BRIGHTNESS, PRE_CHARGE_PERIOD, 0xF1, VCOM_DETECT, 0x20, DISPLAY_ALL_ON_RESUME, NORMAL_DISPLAY, DEACTIVATE_SCROLL, DISPLAY_ON};
+    if (I2C_TRANSMIT_P(display_setup2) != I2C_STATUS_SUCCESS) {
+        print("display_setup2 failed\n");
+        return false;
+    }
+
+#if OLED_TIMEOUT > 0
+    oled_timeout = timer_read32() + OLED_TIMEOUT;
+#endif
+#if OLED_SCROLL_TIMEOUT > 0
+    oled_scroll_timeout = timer_read32() + OLED_SCROLL_TIMEOUT;
+#endif
+
+    oled_clear();
+    oled_initialized = true;
+    oled_active      = true;
+    oled_scrolling   = false;
+    return true;
+}
+
+__attribute__((weak)) oled_rotation_t oled_init_user(oled_rotation_t rotation) { return rotation; }
+
+void oled_clear(void) {
+    memset(oled_buffer, 0, sizeof(oled_buffer));
+    oled_cursor = &oled_buffer[0];
+    oled_dirty  = OLED_ALL_BLOCKS_MASK;
+}
+
+static void calc_bounds(uint8_t update_start, uint8_t *cmd_array) {
+    // Calculate commands to set memory addressing bounds.
+    uint8_t start_page   = OLED_BLOCK_SIZE * update_start / OLED_DISPLAY_WIDTH;
+    uint8_t start_column = OLED_BLOCK_SIZE * update_start % OLED_DISPLAY_WIDTH;
+#if (OLED_IC == OLED_IC_SH1106)
+    // Commands for Page Addressing Mode. Sets starting page and column; has no end bound.
+    // Column value must be split into high and low nybble and sent as two commands.
+    cmd_array[0] = PAM_PAGE_ADDR | start_page;
+    cmd_array[1] = PAM_SETCOLUMN_LSB | ((OLED_COLUMN_OFFSET + start_column) & 0x0f);
+    cmd_array[2] = PAM_SETCOLUMN_MSB | ((OLED_COLUMN_OFFSET + start_column) >> 4 & 0x0f);
+    cmd_array[3] = NOP;
+    cmd_array[4] = NOP;
+    cmd_array[5] = NOP;
+#else
+    // Commands for use in Horizontal Addressing mode.
+    cmd_array[1] = start_column;
+    cmd_array[4] = start_page;
+    cmd_array[2] = (OLED_BLOCK_SIZE + OLED_DISPLAY_WIDTH - 1) % OLED_DISPLAY_WIDTH + cmd_array[1];
+    cmd_array[5] = (OLED_BLOCK_SIZE + OLED_DISPLAY_WIDTH - 1) / OLED_DISPLAY_WIDTH - 1;
+#endif
+}
+
+static void calc_bounds_90(uint8_t update_start, uint8_t *cmd_array) {
+    cmd_array[1] = OLED_BLOCK_SIZE * update_start / OLED_DISPLAY_HEIGHT * 8;
+    cmd_array[4] = OLED_BLOCK_SIZE * update_start % OLED_DISPLAY_HEIGHT;
+    cmd_array[2] = (OLED_BLOCK_SIZE + OLED_DISPLAY_HEIGHT - 1) / OLED_DISPLAY_HEIGHT * 8 - 1 + cmd_array[1];
+    ;
+    cmd_array[5] = (OLED_BLOCK_SIZE + OLED_DISPLAY_HEIGHT - 1) % OLED_DISPLAY_HEIGHT / 8;
+}
+
+uint8_t crot(uint8_t a, int8_t n) {
+    const uint8_t mask = 0x7;
+    n &= mask;
+    return a << n | a >> (-n & mask);
+}
+
+static void rotate_90(const uint8_t *src, uint8_t *dest) {
+    for (uint8_t i = 0, shift = 7; i < 8; ++i, --shift) {
+        uint8_t selector = (1 << i);
+        for (uint8_t j = 0; j < 8; ++j) {
+            dest[i] |= crot(src[j] & selector, shift - (int8_t)j);
+        }
+    }
+}
+
+void oled_render(void) {
+    if (!oled_initialized) {
+        return;
+    }
+
+    // Do we have work to do?
+    oled_dirty &= OLED_ALL_BLOCKS_MASK;
+    if (!oled_dirty || oled_scrolling) {
+        return;
+    }
+
+    // Find first dirty block
+    uint8_t update_start = 0;
+    while (!(oled_dirty & ((OLED_BLOCK_TYPE)1 << update_start))) {
+        ++update_start;
+    }
+
+    // Set column & page position
+    static uint8_t display_start[] = {I2C_CMD, COLUMN_ADDR, 0, OLED_DISPLAY_WIDTH - 1, PAGE_ADDR, 0, OLED_DISPLAY_HEIGHT / 8 - 1};
+    if (!HAS_FLAGS(oled_rotation, OLED_ROTATION_90)) {
+        calc_bounds(update_start, &display_start[1]);  // Offset from I2C_CMD byte at the start
+    } else {
+        calc_bounds_90(update_start, &display_start[1]);  // Offset from I2C_CMD byte at the start
+    }
+
+    // Send column & page position
+    if (I2C_TRANSMIT(display_start) != I2C_STATUS_SUCCESS) {
+        print("oled_render offset command failed\n");
+        return;
+    }
+
+    if (!HAS_FLAGS(oled_rotation, OLED_ROTATION_90)) {
+        // Send render data chunk as is
+        if (I2C_WRITE_REG(I2C_DATA, &oled_buffer[OLED_BLOCK_SIZE * update_start], OLED_BLOCK_SIZE) != I2C_STATUS_SUCCESS) {
+            print("oled_render data failed\n");
+            return;
+        }
+    } else {
+        // Rotate the render chunks
+        const static uint8_t source_map[] = OLED_SOURCE_MAP;
+        const static uint8_t target_map[] = OLED_TARGET_MAP;
+
+        static uint8_t temp_buffer[OLED_BLOCK_SIZE];
+        memset(temp_buffer, 0, sizeof(temp_buffer));
+        for (uint8_t i = 0; i < sizeof(source_map); ++i) {
+            rotate_90(&oled_buffer[OLED_BLOCK_SIZE * update_start + source_map[i]], &temp_buffer[target_map[i]]);
+        }
+
+        // Send render data chunk after rotating
+        if (I2C_WRITE_REG(I2C_DATA, &temp_buffer[0], OLED_BLOCK_SIZE) != I2C_STATUS_SUCCESS) {
+            print("oled_render90 data failed\n");
+            return;
+        }
+    }
+
+    // Turn on display if it is off
+    oled_on();
+
+    // Clear dirty flag
+    oled_dirty &= ~((OLED_BLOCK_TYPE)1 << update_start);
+}
+
+void oled_set_cursor(uint8_t col, uint8_t line) {
+    uint16_t index = line * oled_rotation_width + col * OLED_FONT_WIDTH;
+
+    // Out of bounds?
+    if (index >= OLED_MATRIX_SIZE) {
+        index = 0;
+    }
+
+    oled_cursor = &oled_buffer[index];
+}
+
+void oled_advance_page(bool clearPageRemainder) {
+    uint16_t index     = oled_cursor - &oled_buffer[0];
+    uint8_t  remaining = oled_rotation_width - (index % oled_rotation_width);
+
+    if (clearPageRemainder) {
+        // Remaining Char count
+        remaining = remaining / OLED_FONT_WIDTH;
+
+        // Write empty character until next line
+        while (remaining--) oled_write_char(' ', false);
+    } else {
+        // Next page index out of bounds?
+        if (index + remaining >= OLED_MATRIX_SIZE) {
+            index     = 0;
+            remaining = 0;
+        }
+
+        oled_cursor = &oled_buffer[index + remaining];
+    }
+}
+
+void oled_advance_char(void) {
+    uint16_t nextIndex      = oled_cursor - &oled_buffer[0] + OLED_FONT_WIDTH;
+    uint8_t  remainingSpace = oled_rotation_width - (nextIndex % oled_rotation_width);
+
+    // Do we have enough space on the current line for the next character
+    if (remainingSpace < OLED_FONT_WIDTH) {
+        nextIndex += remainingSpace;
+    }
+
+    // Did we go out of bounds
+    if (nextIndex >= OLED_MATRIX_SIZE) {
+        nextIndex = 0;
+    }
+
+    // Update cursor position
+    oled_cursor = &oled_buffer[nextIndex];
+}
+
+// Main handler that writes character data to the display buffer
+void oled_write_char(const char data, bool invert) {
+    // Advance to the next line if newline
+    if (data == '\n') {
+        // Old source wrote ' ' until end of line...
+        oled_advance_page(true);
+        return;
+    }
+
+    if (data == '\r') {
+        oled_advance_page(false);
+        return;
+    }
+
+    // copy the current render buffer to check for dirty after
+    static uint8_t oled_temp_buffer[OLED_FONT_WIDTH];
+    memcpy(&oled_temp_buffer, oled_cursor, OLED_FONT_WIDTH);
+
+    _Static_assert(sizeof(font) >= ((OLED_FONT_END + 1 - OLED_FONT_START) * OLED_FONT_WIDTH), "OLED_FONT_END references outside array");
+
+    // set the reder buffer data
+    uint8_t cast_data = (uint8_t)data;  // font based on unsigned type for index
+    if (cast_data < OLED_FONT_START || cast_data > OLED_FONT_END) {
+        memset(oled_cursor, 0x00, OLED_FONT_WIDTH);
+    } else {
+        const uint8_t *glyph = &font[(cast_data - OLED_FONT_START) * OLED_FONT_WIDTH];
+        memcpy_P(oled_cursor, glyph, OLED_FONT_WIDTH);
+    }
+
+    // Invert if needed
+    if (invert) {
+        InvertCharacter(oled_cursor);
+    }
+
+    // Dirty check
+    if (memcmp(&oled_temp_buffer, oled_cursor, OLED_FONT_WIDTH)) {
+        uint16_t index = oled_cursor - &oled_buffer[0];
+        oled_dirty |= ((OLED_BLOCK_TYPE)1 << (index / OLED_BLOCK_SIZE));
+        // Edgecase check if the written data spans the 2 chunks
+        oled_dirty |= ((OLED_BLOCK_TYPE)1 << ((index + OLED_FONT_WIDTH - 1) / OLED_BLOCK_SIZE));
+    }
+
+    // Finally move to the next char
+    oled_advance_char();
+}
+
+void oled_write(const char *data, bool invert) {
+    const char *end = data + strlen(data);
+    while (data < end) {
+        oled_write_char(*data, invert);
+        data++;
+    }
+}
+
+void oled_write_ln(const char *data, bool invert) {
+    oled_write(data, invert);
+    oled_advance_page(true);
+}
+
+void oled_pan(bool left) {
+    uint16_t i = 0;
+    for (uint16_t y = 0; y < OLED_DISPLAY_HEIGHT / 8; y++) {
+        if (left) {
+            for (uint16_t x = 0; x < OLED_DISPLAY_WIDTH - 1; x++) {
+                i              = y * OLED_DISPLAY_WIDTH + x;
+                oled_buffer[i] = oled_buffer[i + 1];
+            }
+        } else {
+            for (uint16_t x = OLED_DISPLAY_WIDTH - 1; x > 0; x--) {
+                i              = y * OLED_DISPLAY_WIDTH + x;
+                oled_buffer[i] = oled_buffer[i - 1];
+            }
+        }
+    }
+    oled_dirty = OLED_ALL_BLOCKS_MASK;
+}
+
+oled_buffer_reader_t oled_read_raw(uint16_t start_index) {
+    if (start_index > OLED_MATRIX_SIZE) start_index = OLED_MATRIX_SIZE;
+    oled_buffer_reader_t ret_reader;
+    ret_reader.current_element         = &oled_buffer[start_index];
+    ret_reader.remaining_element_count = OLED_MATRIX_SIZE - start_index;
+    return ret_reader;
+}
+
+void oled_write_raw_byte(const char data, uint16_t index) {
+    if (index > OLED_MATRIX_SIZE) index = OLED_MATRIX_SIZE;
+    if (oled_buffer[index] == data) return;
+    oled_buffer[index] = data;
+    oled_dirty |= ((OLED_BLOCK_TYPE)1 << (index / OLED_BLOCK_SIZE));
+}
+
+void oled_write_raw(const char *data, uint16_t size) {
+    uint16_t cursor_start_index = oled_cursor - &oled_buffer[0];
+    if ((size + cursor_start_index) > OLED_MATRIX_SIZE) size = OLED_MATRIX_SIZE - cursor_start_index;
+    for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) {
+        uint8_t c = *data++;
+        if (oled_buffer[i] == c) continue;
+        oled_buffer[i] = c;
+        oled_dirty |= ((OLED_BLOCK_TYPE)1 << (i / OLED_BLOCK_SIZE));
+    }
+}
+
+void oled_write_pixel(uint8_t x, uint8_t y, bool on) {
+    if (x >= oled_rotation_width) {
+        return;
+    }
+    uint16_t index = x + (y / 8) * oled_rotation_width;
+    if (index >= OLED_MATRIX_SIZE) {
+        return;
+    }
+    uint8_t data = oled_buffer[index];
+    if (on) {
+        data |= (1 << (y % 8));
+    } else {
+        data &= ~(1 << (y % 8));
+    }
+    if (oled_buffer[index] != data) {
+        oled_buffer[index] = data;
+        oled_dirty |= ((OLED_BLOCK_TYPE)1 << (index / OLED_BLOCK_SIZE));
+    }
+}
+
+#if defined(__AVR__)
+void oled_write_P(const char *data, bool invert) {
+    uint8_t c = pgm_read_byte(data);
+    while (c != 0) {
+        oled_write_char(c, invert);
+        c = pgm_read_byte(++data);
+    }
+}
+
+void oled_write_ln_P(const char *data, bool invert) {
+    oled_write_P(data, invert);
+    oled_advance_page(true);
+}
+
+void oled_write_raw_P(const char *data, uint16_t size) {
+    uint16_t cursor_start_index = oled_cursor - &oled_buffer[0];
+    if ((size + cursor_start_index) > OLED_MATRIX_SIZE) size = OLED_MATRIX_SIZE - cursor_start_index;
+    for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) {
+        uint8_t c = pgm_read_byte(data++);
+        if (oled_buffer[i] == c) continue;
+        oled_buffer[i] = c;
+        oled_dirty |= ((OLED_BLOCK_TYPE)1 << (i / OLED_BLOCK_SIZE));
+    }
+}
+#endif  // defined(__AVR__)
+
+bool oled_on(void) {
+    if (!oled_initialized) {
+        return oled_active;
+    }
+
+#if OLED_TIMEOUT > 0
+    oled_timeout = timer_read32() + OLED_TIMEOUT;
+#endif
+
+    static const uint8_t PROGMEM display_on[] =
+#ifdef OLED_FADE_OUT
+        {I2C_CMD, FADE_BLINK, 0x00};
+#else
+        {I2C_CMD, DISPLAY_ON};
+#endif
+
+    if (!oled_active) {
+        if (I2C_TRANSMIT_P(display_on) != I2C_STATUS_SUCCESS) {
+            print("oled_on cmd failed\n");
+            return oled_active;
+        }
+        oled_active = true;
+    }
+    return oled_active;
+}
+
+bool oled_off(void) {
+    if (!oled_initialized) {
+        return !oled_active;
+    }
+
+    static const uint8_t PROGMEM display_off[] =
+#ifdef OLED_FADE_OUT
+        {I2C_CMD, FADE_BLINK, ENABLE_FADE | OLED_FADE_OUT_INTERVAL};
+#else
+        {I2C_CMD, DISPLAY_OFF};
+#endif
+
+    if (oled_active) {
+        if (I2C_TRANSMIT_P(display_off) != I2C_STATUS_SUCCESS) {
+            print("oled_off cmd failed\n");
+            return oled_active;
+        }
+        oled_active = false;
+    }
+    return !oled_active;
+}
+
+bool is_oled_on(void) { return oled_active; }
+
+uint8_t oled_set_brightness(uint8_t level) {
+    if (!oled_initialized) {
+        return oled_brightness;
+    }
+
+    uint8_t set_contrast[] = {I2C_CMD, CONTRAST, level};
+    if (oled_brightness != level) {
+        if (I2C_TRANSMIT(set_contrast) != I2C_STATUS_SUCCESS) {
+            print("set_brightness cmd failed\n");
+            return oled_brightness;
+        }
+        oled_brightness = level;
+    }
+    return oled_brightness;
+}
+
+uint8_t oled_get_brightness(void) { return oled_brightness; }
+
+// Set the specific 8 lines rows of the screen to scroll.
+// 0 is the default for start, and 7 for end, which is the entire
+// height of the screen.  For 128x32 screens, rows 4-7 are not used.
+void oled_scroll_set_area(uint8_t start_line, uint8_t end_line) {
+    oled_scroll_start = start_line;
+    oled_scroll_end   = end_line;
+}
+
+void oled_scroll_set_speed(uint8_t speed) {
+    // Sets the speed for scrolling... does not take effect
+    // until scrolling is either started or restarted
+    // the ssd1306 supports 8 speeds
+    // FrameRate2   speed = 7
+    // FrameRate3   speed = 4
+    // FrameRate4   speed = 5
+    // FrameRate5   speed = 0
+    // FrameRate25  speed = 6
+    // FrameRate64  speed = 1
+    // FrameRate128 speed = 2
+    // FrameRate256 speed = 3
+    // for ease of use these are remaped here to be in order
+    static const uint8_t scroll_remap[8] = {7, 4, 5, 0, 6, 1, 2, 3};
+    oled_scroll_speed                    = scroll_remap[speed];
+}
+
+bool oled_scroll_right(void) {
+    if (!oled_initialized) {
+        return oled_scrolling;
+    }
+
+    // Dont enable scrolling if we need to update the display
+    // This prevents scrolling of bad data from starting the scroll too early after init
+    if (!oled_dirty && !oled_scrolling) {
+        uint8_t display_scroll_right[] = {I2C_CMD, SCROLL_RIGHT, 0x00, oled_scroll_start, oled_scroll_speed, oled_scroll_end, 0x00, 0xFF, ACTIVATE_SCROLL};
+        if (I2C_TRANSMIT(display_scroll_right) != I2C_STATUS_SUCCESS) {
+            print("oled_scroll_right cmd failed\n");
+            return oled_scrolling;
+        }
+        oled_scrolling = true;
+    }
+    return oled_scrolling;
+}
+
+bool oled_scroll_left(void) {
+    if (!oled_initialized) {
+        return oled_scrolling;
+    }
+
+    // Dont enable scrolling if we need to update the display
+    // This prevents scrolling of bad data from starting the scroll too early after init
+    if (!oled_dirty && !oled_scrolling) {
+        uint8_t display_scroll_left[] = {I2C_CMD, SCROLL_LEFT, 0x00, oled_scroll_start, oled_scroll_speed, oled_scroll_end, 0x00, 0xFF, ACTIVATE_SCROLL};
+        if (I2C_TRANSMIT(display_scroll_left) != I2C_STATUS_SUCCESS) {
+            print("oled_scroll_left cmd failed\n");
+            return oled_scrolling;
+        }
+        oled_scrolling = true;
+    }
+    return oled_scrolling;
+}
+
+bool oled_scroll_off(void) {
+    if (!oled_initialized) {
+        return !oled_scrolling;
+    }
+
+    if (oled_scrolling) {
+        static const uint8_t PROGMEM display_scroll_off[] = {I2C_CMD, DEACTIVATE_SCROLL};
+        if (I2C_TRANSMIT_P(display_scroll_off) != I2C_STATUS_SUCCESS) {
+            print("oled_scroll_off cmd failed\n");
+            return oled_scrolling;
+        }
+        oled_scrolling = false;
+        oled_dirty     = OLED_ALL_BLOCKS_MASK;
+    }
+    return !oled_scrolling;
+}
+
+bool oled_invert(bool invert) {
+    if (!oled_initialized) {
+        return oled_inverted;
+    }
+
+    if (invert && !oled_inverted) {
+        static const uint8_t PROGMEM display_inverted[] = {I2C_CMD, INVERT_DISPLAY};
+        if (I2C_TRANSMIT_P(display_inverted) != I2C_STATUS_SUCCESS) {
+            print("oled_invert cmd failed\n");
+            return oled_inverted;
+        }
+        oled_inverted = true;
+    } else if (!invert && oled_inverted) {
+        static const uint8_t PROGMEM display_normal[] = {I2C_CMD, NORMAL_DISPLAY};
+        if (I2C_TRANSMIT_P(display_normal) != I2C_STATUS_SUCCESS) {
+            print("oled_invert cmd failed\n");
+            return oled_inverted;
+        }
+        oled_inverted = false;
+    }
+
+    return oled_inverted;
+}
+
+uint8_t oled_max_chars(void) {
+    if (!HAS_FLAGS(oled_rotation, OLED_ROTATION_90)) {
+        return OLED_DISPLAY_WIDTH / OLED_FONT_WIDTH;
+    }
+    return OLED_DISPLAY_HEIGHT / OLED_FONT_WIDTH;
+}
+
+uint8_t oled_max_lines(void) {
+    if (!HAS_FLAGS(oled_rotation, OLED_ROTATION_90)) {
+        return OLED_DISPLAY_HEIGHT / OLED_FONT_HEIGHT;
+    }
+    return OLED_DISPLAY_WIDTH / OLED_FONT_HEIGHT;
+}
+
+void oled_task(void) {
+    if (!oled_initialized) {
+        return;
+    }
+
+#if OLED_UPDATE_INTERVAL > 0
+    if (timer_elapsed(oled_update_timeout) >= OLED_UPDATE_INTERVAL) {
+        oled_update_timeout = timer_read();
+        oled_set_cursor(0, 0);
+        oled_task_user();
+    }
+#else
+    oled_set_cursor(0, 0);
+    oled_task_user();
+#endif
+
+#if OLED_SCROLL_TIMEOUT > 0
+    if (oled_dirty && oled_scrolling) {
+        oled_scroll_timeout = timer_read32() + OLED_SCROLL_TIMEOUT;
+        oled_scroll_off();
+    }
+#endif
+
+    // Smart render system, no need to check for dirty
+    oled_render();
+
+    // Display timeout check
+#if OLED_TIMEOUT > 0
+    if (oled_active && timer_expired32(timer_read32(), oled_timeout)) {
+        oled_off();
+    }
+#endif
+
+#if OLED_SCROLL_TIMEOUT > 0
+    if (!oled_scrolling && timer_expired32(timer_read32(), oled_scroll_timeout)) {
+#    ifdef OLED_SCROLL_TIMEOUT_RIGHT
+        oled_scroll_right();
+#    else
+        oled_scroll_left();
+#    endif
+    }
+#endif
+}
+
+__attribute__((weak)) void oled_task_user(void) {}