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Another round of optimizations

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DJGummikuh 2024-08-13 21:01:39 +00:00
parent 6f1db1d3fb
commit 54901977d9
2 changed files with 23 additions and 17 deletions
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31
esphome/components/waveshare_epaper/waveshare_epaper.cpp
View file

@ -1527,29 +1527,28 @@ void GDEY075Z08::calculate_crcs_(bool full_sync) {
ESP_LOGD(TAG, "Entering CRC calculation Loop");
for (seg_y = 0; seg_y < this->seg_y_; seg_y++) { // vertically iterate through the number of lines (px)
for (seg_x = 0; seg_x < this->seg_x_; seg_x++) { // horizontally iterate through number of columns (px)
uint8_t *segment = new uint8_t[segment_size * 2]; // create segment array (muliply by 2 since we need 2 byte per
// 8 pixel, 1 for black and 1 for red)
for (y = 0; y < height_px; y++) {
for (x = 0; x < width_b; x++) {
uint16_t segment_position = x + y * width_b; // linear position inside the segment in bytes
uint16_t global_position = seg_y * height_px * this->get_width_internal() / 8 +
y * this->get_width_internal() / 8 + seg_x * width_b + x;
segment[segment_position] = this->buffer_[global_position]; // copy black data
segment[segment_position + segment_size] = this->buffer_[global_position + buffer_half_size]; // copy red data
this->segment_buffer_[segment_position] = this->buffer_[global_position]; // copy black data
this->segment_buffer_[segment_position + segment_size] =
this->buffer_[global_position + buffer_half_size]; // copy red data
}
}
// now calculate a CRC16_checksum and compare it against the stored value.
// ESP_LOGD(TAG, "Calculating a CRC");
uint16_t segment_crc = crc16(segment, segment_size * 2, 65535U, 40961U, false, false);
uint16_t segment_crc = crc16(this->segment_buffer_, segment_size * 2, 65535U, 40961U, false, false);
if (full_sync) {
// no need to compare, we're in the first run, just place it. This is called by full refresh only
this->checksums_[seg_x + seg_y * seg_x_] = segment_crc;
this->checksums_[seg_x + seg_y * this->seg_x_] = segment_crc;
} else {
// Partial Update, compare checksums while replacing and record the X and Y block position of the top left and
// bottom right corner of the changed elements. Afterwards, we can partially update only the segment that has
// been altered.
bool changed = this->checksums_[seg_x + seg_y * seg_x_] != segment_crc;
this->checksums_[seg_x + seg_y * seg_x_] = segment_crc;
bool changed = this->checksums_[seg_x + seg_y * this->seg_x_] != segment_crc;
this->checksums_[seg_x + seg_y * this->seg_x_] = segment_crc;
if (changed && !found_change) {
found_change = true;
// We need to span the x segment, with the lowest segment found making the first segment and the highest
@ -1572,7 +1571,6 @@ void GDEY075Z08::calculate_crcs_(bool full_sync) {
// do nothing, segment didn't change.
}
}
delete[] segment; // Delete the heap element again, this is not java... >.<
}
}
if (found_change) {
@ -1631,11 +1629,18 @@ void GDEY075Z08::init_fast_() {
this->data(0x07);
}
void GDEY075Z08::initialize() {
ExternalRAMAllocator<uint8_t> allocator8(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
ExternalRAMAllocator<uint16_t> allocator16(ExternalRAMAllocator<uint16_t>::ALLOW_FAILURE);
uint16_t width_b = this->get_width_internal() / (this->seg_x_ * 8); // width of individual segments in bytes
uint16_t height_px = this->get_height_internal() / this->seg_y_; // height of individual segments in pixel
uint16_t segment_size = width_b * height_px;
this->segment_buffer_ = allocator8.allocate(
segment_size * 2); // Allocate the buffer for twice the segment size because we have 2 bit per Pixel.
this->reset_();
this->at_update_ = 0;
checksums_ =
new uint16_t[seg_x_ *
seg_y_]; // initialize the checksums array. Will be filed and maintained by calculate_CRCs_()
this->checksums_ = allocator16.allocate(
this->seg_x_ *
this->seg_y_); // initialize the checksums array. Will be filed and maintained by calculate_crss_()
ESP_LOGE(TAG, "Before Powerup, after Reset");
this->command(0x01); // POWER SETTING
@ -1701,7 +1706,7 @@ void HOT GDEY075Z08::display() {
ESP_LOGI(TAG, "Evaluating Partial Screen Update");
this->calculate_crcs_(false);
ESP_LOGD(TAG, "Partial Screen Update Evaluation complete");
if (first_segment_x_ > seg_x_ || first_segment_x_ > last_segment_x_) {
if (this->first_segment_x_ > this->seg_x_ || this->first_segment_x_ > this->last_segment_x_) {
// if first_segment_x_ was not altered from seg_x_ + 1, this means that no changes have happened in the display.
// Jump out, without waking the display, so we don't have to send it back to sleep.
return;

1
esphome/components/waveshare_epaper/waveshare_epaper.h
View file

@ -250,6 +250,7 @@ class GDEY075Z08 : public WaveshareEPaperBWR {
uint32_t at_update_{0};
uint8_t seg_x_{20}; // number of horizontal segments for partial update
uint8_t seg_y_{10}; // number of vertical segments for partial update.
uint8_t *segment_buffer_; // byte buffer of segments to hold a single segment for CRC calculation.
uint16_t first_segment_x_ = 0;
uint16_t first_segment_y_ = 0;
uint16_t last_segment_x_ = 0;