st7567_base.cpp

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#include "st7567_base.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
 
namespace esphome::st7567_base {
 
ESPHOME_LOG_TAG(TAG, "st7567");
 
void ST7567::setup() {
  this->init_internal_(this->get_buffer_length_());
  this->display_init_();
}
 
void ST7567::display_init_() {
  ESP_LOGD(TAG, "Initializing display");
  this->display_init_registers_();
  this->clear();
  this->write_display_data();
  this->command(ST7567_DISPLAY_ON);
}
 
void ST7567::display_init_registers_() {
  this->command(ST7567_BIAS_9);
  this->command(this->mirror_x_ ? ST7567_SEG_REVERSE : ST7567_SEG_NORMAL);
  this->command(this->mirror_y_ ? ST7567_COM_NORMAL : ST7567_COM_REMAP);
  this->command(ST7567_POWER_CTL | 0x4);
  this->command(ST7567_POWER_CTL | 0x6);
  this->command(ST7567_POWER_CTL | 0x7);
 
  this->set_brightness(this->brightness_);
  this->set_contrast(this->contrast_);
 
  this->command(ST7567_INVERT_OFF | this->invert_colors_);
 
  this->command(ST7567_BOOSTER_ON);
  this->command(ST7567_REGULATOR_ON);
  this->command(ST7567_POWER_ON);
 
  this->command(ST7567_SCAN_START_LINE);
  this->command(ST7567_PIXELS_NORMAL | this->all_pixels_on_);
}
 
void ST7567::display_sw_refresh_() {
  ESP_LOGD(TAG, "Performing refresh sequence");
  this->command(ST7567_SW_REFRESH);
  this->display_init_registers_();
}
 
void ST7567::request_refresh() {
  // as per datasheet: It is recommended to use the refresh sequence regularly in a specified interval.
  this->refresh_requested_ = true;
}
 
void ST7567::update() {
  this->do_update_();
  if (this->refresh_requested_) {
    this->refresh_requested_ = false;
    this->display_sw_refresh_();
  }
  this->write_display_data();
}
 
void ST7567::set_all_pixels_on(bool enable) {
  this->all_pixels_on_ = enable;
  this->command(ST7567_PIXELS_NORMAL | this->all_pixels_on_);
}
 
void ST7567::set_invert_colors(bool invert_colors) {
  this->invert_colors_ = invert_colors;
  this->command(ST7567_INVERT_OFF | this->invert_colors_);
}
 
void ST7567::set_contrast(uint8_t val) {
  this->contrast_ = val & 0b111111;
  // 0..63, 26 is normal
 
  // two byte command
  // first byte 0x81
  // second byte 0-63
 
  this->command(ST7567_SET_EV_CMD);
  this->command(this->contrast_);
}
 
void ST7567::set_brightness(uint8_t val) {
  this->brightness_ = val & 0b111;
  // 0..7, 5 normal
 
  //********Adjust display brightness********
  // 0x20-0x27 is the internal Rb/Ra resistance
  // adjustment setting of V5 voltage RR=4.5V
 
  this->command(ST7567_RESISTOR_RATIO | this->brightness_);
}
 
bool ST7567::is_on() { return this->is_on_; }
 
void ST7567::turn_on() {
  this->command(ST7567_DISPLAY_ON);
  this->is_on_ = true;
}
 
void ST7567::turn_off() {
  this->command(ST7567_DISPLAY_OFF);
  this->is_on_ = false;
}
 
void ST7567::set_scroll(uint8_t line) { this->start_line_ = line % this->get_height_internal(); }
 
int ST7567::get_width_internal() { return 128; }
 
int ST7567::get_height_internal() { return 64; }
 
// 128x64, but memory size 132x64, line starts from 0, but if mirrored then it starts from 131, not 127
size_t ST7567::get_buffer_length_() {
  return size_t(this->get_width_internal() + 4) * size_t(this->get_height_internal()) / 8u;
}
 
void HOT ST7567::draw_absolute_pixel_internal(int x, int y, Color color) {
  if (x >= this->get_width_internal() || x < 0 || y >= this->get_height_internal() || y < 0) {
    return;
  }
 
  uint16_t pos = x + (y / 8) * this->get_width_internal();
  uint8_t subpos = y & 0x07;
  assign_bits(this->buffer_[pos], 1 << subpos, color.is_on());
}
 
void ST7567::fill(Color color) {
  // If clipping is active, fall back to base implementation
  if (this->get_clipping().is_set()) {
    Display::fill(color);
    return;
  }
 
  uint8_t fill = color.is_on() ? 0xFF : 0x00;
  memset(buffer_, fill, this->get_buffer_length_());
}
 
void ST7567::init_reset_() {
  if (this->reset_pin_ != nullptr) {
    this->reset_pin_->setup();
    this->reset_pin_->digital_write(true);
    delay(1);
    // Trigger Reset
    this->reset_pin_->digital_write(false);
    delay(10);
    // Wake up
    this->reset_pin_->digital_write(true);
  }
}
 
const char *ST7567::model_str_() { return "ST7567 128x64"; }
 
}  // namespace esphome::st7567_base