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Only send on display change

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This commit is contained in:
Ben V. Brown
2022-11-06 22:10:09 +11:00
parent f11f550e0b
commit 7eb9f3f10d
2 changed files with 15 additions and 6 deletions
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2
source/Core/Drivers/OLED.cpp
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@@ -25,7 +25,7 @@ bool OLED::initDone = false;
uint8_t OLED::displayOffset; uint8_t OLED::displayOffset;
uint8_t OLED::screenBuffer[16 + (OLED_WIDTH * 2) + 10]; // The data buffer uint8_t OLED::screenBuffer[16 + (OLED_WIDTH * 2) + 10]; // The data buffer
uint8_t OLED::secondFrameBuffer[OLED_WIDTH * 2]; uint8_t OLED::secondFrameBuffer[OLED_WIDTH * 2];
uint32_t OLED::displayChecksum;
/*Setup params for the OLED screen*/ /*Setup params for the OLED screen*/
/*http://www.displayfuture.com/Display/datasheet/controller/SSD1307.pdf*/ /*http://www.displayfuture.com/Display/datasheet/controller/SSD1307.pdf*/
/*All commands are prefixed with 0x80*/ /*All commands are prefixed with 0x80*/

13
source/Core/Drivers/OLED.hpp
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@@ -47,12 +47,20 @@ public:
static void initialize(); // Startup the I2C coms (brings screen out of reset etc) static void initialize(); // Startup the I2C coms (brings screen out of reset etc)
static bool isInitDone(); static bool isInitDone();
// Draw the buffer out to the LCD using the DMA Channel // Draw the buffer out to the LCD if any content has changed.
static void refresh() { static void refresh() {
I2C_CLASS::Transmit(DEVICEADDR_OLED, screenBuffer, FRAMEBUFFER_START + (OLED_WIDTH * 2)); uint32_t hash = 0;
const int len = FRAMEBUFFER_START + (OLED_WIDTH * 2);
for (int i = 0; i < len; i++) {
hash += (i * screenBuffer[i]);
}
if (hash != displayChecksum) {
displayChecksum = hash;
I2C_CLASS::Transmit(DEVICEADDR_OLED, screenBuffer, len);
// DMA tx time is ~ 20mS Ensure after calling this you delay for at least 25ms // DMA tx time is ~ 20mS Ensure after calling this you delay for at least 25ms
// or we need to goto double buffering // or we need to goto double buffering
} }
}
static void setDisplayState(DisplayState state) { static void setDisplayState(DisplayState state) {
displayState = state; displayState = state;
@@ -112,6 +120,7 @@ private:
static DisplayState displayState; static DisplayState displayState;
static int16_t cursor_x, cursor_y; static int16_t cursor_x, cursor_y;
static uint8_t displayOffset; static uint8_t displayOffset;
static uint32_t displayChecksum;
static uint8_t screenBuffer[16 + (OLED_WIDTH * 2) + 10]; // The data buffer static uint8_t screenBuffer[16 + (OLED_WIDTH * 2) + 10]; // The data buffer
static uint8_t secondFrameBuffer[OLED_WIDTH * 2]; static uint8_t secondFrameBuffer[OLED_WIDTH * 2];
}; };