opensteno_qmk/drivers/avr/ssd1306.c
2019-08-30 15:01:52 -07:00

320 lines
7.6 KiB
C

#ifdef SSD1306OLED
# include "ssd1306.h"
# include "i2c.h"
# include <string.h>
# include "print.h"
# include "glcdfont.c"
# ifdef ADAFRUIT_BLE_ENABLE
# include "adafruit_ble.h"
# endif
# ifdef PROTOCOL_LUFA
# include "lufa.h"
# endif
# include "sendchar.h"
# include "timer.h"
// Set this to 1 to help diagnose early startup problems
// when testing power-on with ble. Turn it off otherwise,
// as the latency of printing most of the debug info messes
// with the matrix scan, causing keys to drop.
# define DEBUG_TO_SCREEN 0
// static uint16_t last_battery_update;
// static uint32_t vbat;
//#define BatteryUpdateInterval 10000 /* milliseconds */
# define ScreenOffInterval 300000 /* milliseconds */
# if DEBUG_TO_SCREEN
static uint8_t displaying;
# endif
static uint16_t last_flush;
// Write command sequence.
// Returns true on success.
static inline bool _send_cmd1(uint8_t cmd) {
bool res = false;
if (i2c_start_write(SSD1306_ADDRESS)) {
xprintf("failed to start write to %d\n", SSD1306_ADDRESS);
goto done;
}
if (i2c_master_write(0x0 /* command byte follows */)) {
print("failed to write control byte\n");
goto done;
}
if (i2c_master_write(cmd)) {
xprintf("failed to write command %d\n", cmd);
goto done;
}
res = true;
done:
i2c_master_stop();
return res;
}
// Write 2-byte command sequence.
// Returns true on success
static inline bool _send_cmd2(uint8_t cmd, uint8_t opr) {
if (!_send_cmd1(cmd)) {
return false;
}
return _send_cmd1(opr);
}
// Write 3-byte command sequence.
// Returns true on success
static inline bool _send_cmd3(uint8_t cmd, uint8_t opr1, uint8_t opr2) {
if (!_send_cmd1(cmd)) {
return false;
}
if (!_send_cmd1(opr1)) {
return false;
}
return _send_cmd1(opr2);
}
# define send_cmd1(c) \
if (!_send_cmd1(c)) { \
goto done; \
}
# define send_cmd2(c, o) \
if (!_send_cmd2(c, o)) { \
goto done; \
}
# define send_cmd3(c, o1, o2) \
if (!_send_cmd3(c, o1, o2)) { \
goto done; \
}
static void clear_display(void) {
matrix_clear(&display);
// Clear all of the display bits (there can be random noise
// in the RAM on startup)
send_cmd3(PageAddr, 0, (DisplayHeight / 8) - 1);
send_cmd3(ColumnAddr, 0, DisplayWidth - 1);
if (i2c_start_write(SSD1306_ADDRESS)) {
goto done;
}
if (i2c_master_write(0x40)) {
// Data mode
goto done;
}
for (uint8_t row = 0; row < MatrixRows; ++row) {
for (uint8_t col = 0; col < DisplayWidth; ++col) {
i2c_master_write(0);
}
}
display.dirty = false;
done:
i2c_master_stop();
}
# if DEBUG_TO_SCREEN
# undef sendchar
static int8_t capture_sendchar(uint8_t c) {
sendchar(c);
iota_gfx_write_char(c);
if (!displaying) {
iota_gfx_flush();
}
return 0;
}
# endif
bool iota_gfx_init(void) {
bool success = false;
send_cmd1(DisplayOff);
send_cmd2(SetDisplayClockDiv, 0x80);
send_cmd2(SetMultiPlex, DisplayHeight - 1);
send_cmd2(SetDisplayOffset, 0);
send_cmd1(SetStartLine | 0x0);
send_cmd2(SetChargePump, 0x14 /* Enable */);
send_cmd2(SetMemoryMode, 0 /* horizontal addressing */);
# ifdef OLED_ROTATE180
// the following Flip the display orientation 180 degrees
send_cmd1(SegRemap);
send_cmd1(ComScanInc);
# endif
# ifndef OLED_ROTATE180
// Flips the display orientation 0 degrees
send_cmd1(SegRemap | 0x1);
send_cmd1(ComScanDec);
# endif
send_cmd2(SetComPins, 0x2);
send_cmd2(SetContrast, 0x8f);
send_cmd2(SetPreCharge, 0xf1);
send_cmd2(SetVComDetect, 0x40);
send_cmd1(DisplayAllOnResume);
send_cmd1(NormalDisplay);
send_cmd1(DeActivateScroll);
send_cmd1(DisplayOn);
send_cmd2(SetContrast, 0); // Dim
clear_display();
success = true;
iota_gfx_flush();
# if DEBUG_TO_SCREEN
print_set_sendchar(capture_sendchar);
# endif
done:
return success;
}
bool iota_gfx_off(void) {
bool success = false;
send_cmd1(DisplayOff);
success = true;
done:
return success;
}
bool iota_gfx_on(void) {
bool success = false;
send_cmd1(DisplayOn);
success = true;
done:
return success;
}
void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c) {
*matrix->cursor = c;
++matrix->cursor;
if (matrix->cursor - &matrix->display[0][0] == sizeof(matrix->display)) {
// We went off the end; scroll the display upwards by one line
memmove(&matrix->display[0], &matrix->display[1], MatrixCols * (MatrixRows - 1));
matrix->cursor = &matrix->display[MatrixRows - 1][0];
memset(matrix->cursor, ' ', MatrixCols);
}
}
void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c) {
matrix->dirty = true;
if (c == '\n') {
// Clear to end of line from the cursor and then move to the
// start of the next line
uint8_t cursor_col = (matrix->cursor - &matrix->display[0][0]) % MatrixCols;
while (cursor_col++ < MatrixCols) {
matrix_write_char_inner(matrix, ' ');
}
return;
}
matrix_write_char_inner(matrix, c);
}
void iota_gfx_write_char(uint8_t c) { matrix_write_char(&display, c); }
void matrix_write(struct CharacterMatrix *matrix, const char *data) {
const char *end = data + strlen(data);
while (data < end) {
matrix_write_char(matrix, *data);
++data;
}
}
void iota_gfx_write(const char *data) { matrix_write(&display, data); }
void matrix_write_P(struct CharacterMatrix *matrix, const char *data) {
while (true) {
uint8_t c = pgm_read_byte(data);
if (c == 0) {
return;
}
matrix_write_char(matrix, c);
++data;
}
}
void iota_gfx_write_P(const char *data) { matrix_write_P(&display, data); }
void matrix_clear(struct CharacterMatrix *matrix) {
memset(matrix->display, ' ', sizeof(matrix->display));
matrix->cursor = &matrix->display[0][0];
matrix->dirty = true;
}
void iota_gfx_clear_screen(void) { matrix_clear(&display); }
void matrix_render(struct CharacterMatrix *matrix) {
last_flush = timer_read();
iota_gfx_on();
# if DEBUG_TO_SCREEN
++displaying;
# endif
// Move to the home position
send_cmd3(PageAddr, 0, MatrixRows - 1);
send_cmd3(ColumnAddr, 0, (MatrixCols * FontWidth) - 1);
if (i2c_start_write(SSD1306_ADDRESS)) {
goto done;
}
if (i2c_master_write(0x40)) {
// Data mode
goto done;
}
for (uint8_t row = 0; row < MatrixRows; ++row) {
for (uint8_t col = 0; col < MatrixCols; ++col) {
const uint8_t *glyph = font + (matrix->display[row][col] * (FontWidth - 1));
for (uint8_t glyphCol = 0; glyphCol < FontWidth - 1; ++glyphCol) {
uint8_t colBits = pgm_read_byte(glyph + glyphCol);
i2c_master_write(colBits);
}
// 1 column of space between chars (it's not included in the glyph)
i2c_master_write(0);
}
}
matrix->dirty = false;
done:
i2c_master_stop();
# if DEBUG_TO_SCREEN
--displaying;
# endif
}
void iota_gfx_flush(void) { matrix_render(&display); }
__attribute__((weak)) void iota_gfx_task_user(void) {}
void iota_gfx_task(void) {
iota_gfx_task_user();
if (display.dirty) {
iota_gfx_flush();
}
if (timer_elapsed(last_flush) > ScreenOffInterval) {
iota_gfx_off();
}
}
#endif