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Fix SSD1306 post-setup brightness control (#1090)

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* Fix post-setup brightness control

* Add turn_on() and turn_off() methods

* Added is_on() method

* Set brightness later in setup()

* Use clamp() for brightness validation
This commit is contained in:
Keith Burzinski 2020-08-23 18:36:11 -05:00 committed by GitHub
parent 9a57e8fcb0
commit 69f5d8cd0f
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 34 additions and 27 deletions
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2
esphome/components/ssd1306_base/__init__.py
View file

@ -41,7 +41,7 @@ def setup_ssd1036(var, config):
reset = yield cg.gpio_pin_expression(config[CONF_RESET_PIN])
cg.add(var.set_reset_pin(reset))
if CONF_BRIGHTNESS in config:
cg.add(var.set_brightness(config[CONF_BRIGHTNESS]))
cg.add(var.init_brightness(config[CONF_BRIGHTNESS]))
if CONF_EXTERNAL_VCC in config:
cg.add(var.set_external_vcc(config[CONF_EXTERNAL_VCC]))
if CONF_LAMBDA in config:

51
esphome/components/ssd1306_base/ssd1306_base.cpp
View file

@ -5,7 +5,11 @@
namespace esphome {
namespace ssd1306_base {
static const char *TAG = "sd1306";
static const char *TAG = "ssd1306";
static const uint8_t BLACK = 0;
static const uint8_t WHITE = 1;
static const uint8_t SSD1306_MAX_CONTRAST = 255;
static const uint8_t SSD1306_COMMAND_DISPLAY_OFF = 0xAE;
static const uint8_t SSD1306_COMMAND_DISPLAY_ON = 0xAF;
@ -69,27 +73,6 @@ void SSD1306::setup() {
break;
}
this->command(SSD1306_COMMAND_SET_CONTRAST);
switch (this->model_) {
case SSD1306_MODEL_128_32:
case SH1106_MODEL_128_32:
this->command(0x8F);
break;
case SSD1306_MODEL_128_64:
case SH1106_MODEL_128_64:
case SSD1306_MODEL_64_48:
case SH1106_MODEL_64_48:
this->command(int(255 * (this->brightness_)));
break;
case SSD1306_MODEL_96_16:
case SH1106_MODEL_96_16:
if (this->external_vcc_)
this->command(0x10);
else
this->command(0xAF);
break;
}
this->command(SSD1306_COMMAND_SET_PRE_CHARGE);
if (this->external_vcc_)
this->command(0x22);
@ -104,7 +87,12 @@ void SSD1306::setup() {
this->command(SSD1306_COMMAND_DEACTIVATE_SCROLL);
this->command(SSD1306_COMMAND_DISPLAY_ON);
set_brightness(this->brightness_);
this->fill(BLACK); // clear display - ensures we do not see garbage at power-on
this->display(); // ...write buffer, which actually clears the display's memory
this->turn_on();
}
void SSD1306::display() {
if (this->is_sh1106_()) {
@ -140,6 +128,22 @@ void SSD1306::update() {
this->do_update_();
this->display();
}
void SSD1306::set_brightness(float brightness) {
// validation
this->brightness_ = clamp(brightness, 0, 1);
// now write the new brightness level to the display
this->command(SSD1306_COMMAND_SET_CONTRAST);
this->command(int(SSD1306_MAX_CONTRAST * (this->brightness_)));
}
bool SSD1306::is_on() { return this->is_on_; }
void SSD1306::turn_on() {
this->command(SSD1306_COMMAND_DISPLAY_ON);
this->is_on_ = true;
}
void SSD1306::turn_off() {
this->command(SSD1306_COMMAND_DISPLAY_OFF);
this->is_on_ = false;
}
int SSD1306::get_height_internal() {
switch (this->model_) {
case SSD1306_MODEL_128_32:
@ -178,7 +182,6 @@ int SSD1306::get_width_internal() {
size_t SSD1306::get_buffer_length_() {
return size_t(this->get_width_internal()) * size_t(this->get_height_internal()) / 8u;
}
void HOT SSD1306::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;

8
esphome/components/ssd1306_base/ssd1306_base.h
View file

@ -29,8 +29,11 @@ class SSD1306 : public PollingComponent, public display::DisplayBuffer {
void set_model(SSD1306Model model) { this->model_ = model; }
void set_reset_pin(GPIOPin *reset_pin) { this->reset_pin_ = reset_pin; }
void set_external_vcc(bool external_vcc) { this->external_vcc_ = external_vcc; }
void set_brightness(float brightness) { this->brightness_ = brightness; }
void init_brightness(float brightness) { this->brightness_ = brightness; }
void set_brightness(float brightness);
bool is_on();
void turn_on();
void turn_off();
float get_setup_priority() const override { return setup_priority::PROCESSOR; }
void fill(Color color) override;
@ -51,6 +54,7 @@ class SSD1306 : public PollingComponent, public display::DisplayBuffer {
SSD1306Model model_{SSD1306_MODEL_128_64};
GPIOPin *reset_pin_{nullptr};
bool external_vcc_{false};
bool is_on_{false};
float brightness_{1.0};
};