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