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faster buffer sending

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This commit is contained in:
Jack Humbert 2018-10-11 13:06:17 -04:00
parent 129df28574
commit 4446a3781c
2 changed files with 20 additions and 7 deletions
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20
drivers/qwiic/micro_oled.c
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@ -43,6 +43,7 @@ uint16_t fontMapWidth;
#define swap(a, b) { uint8_t t = a; a = b; b = t; }
uint8_t micro_oled_transfer_buffer[20];
static uint8_t micro_oled_screen_current[384] = { 0 };
static uint8_t micro_oled_screen_buffer[] = {
/* LCD Memory organised in 64 horizontal pixel and 6 rows of byte
B B .............B -----
@ -145,7 +146,7 @@ void micro_oled_init(void) {
send_command(0x40);
send_command(DISPLAYON); //--turn on oled panel
//clear_screen(); // Erase hardware memory inside the OLED controller to avoid random data in memory.
clear_screen(); // Erase hardware memory inside the OLED controller to avoid random data in memory.
send_buffer();
}
@ -217,19 +218,30 @@ void set_contrast(uint8_t contrast) {
}
/** \brief Transfer display buffer.
Bulk move the screen buffer to the SSD1306 controller's memory so that images/graphics drawn on the screen buffer will be displayed on the OLED.
Sends the updated buffer to the controller - the current status is checked before to save i2c exectution time
*/
void send_buffer(void) {
uint8_t i, j;
uint8_t page_addr = 0xFF;
for (i = 0; i < 6; i++) {
set_page_address(i);
set_column_address(0);
uint8_t col_addr = 0xFF;
for (j = 0; j < 0x40; j++) {
if (micro_oled_screen_buffer[i*0x40+j] != micro_oled_screen_current[i*0x40+j]) {
if (page_addr != i) {
set_page_address(i);
}
if (col_addr != j) {
set_column_address(j);
}
send_data(micro_oled_screen_buffer[i*0x40+j]);
micro_oled_screen_current[i*0x40+j] = micro_oled_screen_buffer[i*0x40+j];
col_addr = j + 1;
}
}
}
}
/** \brief Draw pixel with color and mode.
Draw color pixel in the screen buffer's x,y position with NORM or XOR draw mode.
*/

1
drivers/qwiic/micro_oled.h
View File

@ -37,6 +37,7 @@ void send_command(uint8_t command);
void send_data(uint8_t data);
void set_page_address(uint8_t address);
void set_column_address(uint8_t address);
void clear_screen(void);
void clear_buffer(void);
void send_buffer(void);
void draw_pixel(uint8_t x, uint8_t y, uint8_t color, uint8_t mode);