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Split display checksum out

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This commit is contained in:
Ben V. Brown
2022-11-20 21:16:38 +11:00
parent bbb0cfe713
commit d0ed30ecb6
2 changed files with 15 additions and 7 deletions
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1
source/Core/Drivers/OLED.cpp
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@@ -372,6 +372,7 @@ void OLED::setRotation(bool leftHanded) {
const int len = FRAMEBUFFER_START + (OLED_WIDTH * 2); const int len = FRAMEBUFFER_START + (OLED_WIDTH * 2);
I2C_CLASS::Transmit(DEVICEADDR_OLED, screenBuffer, len); I2C_CLASS::Transmit(DEVICEADDR_OLED, screenBuffer, len);
osDelay(TICKS_10MS); osDelay(TICKS_10MS);
checkDisplayBufferChecksum();
} }
void OLED::setBrightness(uint8_t contrast) { void OLED::setBrightness(uint8_t contrast) {

21
source/Core/Drivers/OLED.hpp
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@@ -51,13 +51,9 @@ public:
static bool isInitDone(); static bool isInitDone();
// Draw the buffer out to the LCD if any content has changed. // Draw the buffer out to the LCD if any content has changed.
static void refresh() { static void refresh() {
uint32_t hash = 0;
const int len = FRAMEBUFFER_START + (OLED_WIDTH * 2); if (checkDisplayBufferChecksum()) {
for (int i = 0; i < len; i++) { const int len = FRAMEBUFFER_START + (OLED_WIDTH * 2);
hash += (i * screenBuffer[i]);
}
if (hash != displayChecksum) {
displayChecksum = hash;
I2C_CLASS::Transmit(DEVICEADDR_OLED, screenBuffer, len); 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
@@ -118,6 +114,17 @@ public:
static void transitionScrollDown(); static void transitionScrollDown();
private: private:
static bool checkDisplayBufferChecksum(){
uint32_t hash = 0;
const int len = FRAMEBUFFER_START + (OLED_WIDTH * 2);
for (int i = 0; i < len; i++) {
hash += (i * screenBuffer[i]);
}
bool result = hash!=displayChecksum;
displayChecksum= hash;
return result;
}
static void drawChar(uint16_t charCode, FontStyle fontStyle); // Draw a character to the current cursor location static void drawChar(uint16_t charCode, FontStyle fontStyle); // Draw a character to the current cursor location
static void setFramebuffer(uint8_t *buffer); static void setFramebuffer(uint8_t *buffer);
static uint8_t *firstStripPtr; // Pointers to the strips to allow for buffer having extra content static uint8_t *firstStripPtr; // Pointers to the strips to allow for buffer having extra content