#include "display.hpp"
//=== variables ===
static const char *TAG = "display"; //tag for logging
//==============================
//======== init display ========
//==============================
//initialize display with parameters defined in config.hpp
//TODO: dont use global variables/macros here
max7219_t display_init(){
ESP_LOGI(TAG, "initializing display...");
// Configure SPI bus
spi_bus_config_t cfg;
memset(&cfg, 0, sizeof(spi_bus_config_t)); //init bus config with 0 to prevent bugs with random flags
cfg.mosi_io_num = DISPLAY_PIN_NUM_MOSI;
cfg.miso_io_num = -1;
cfg.sclk_io_num = DISPLAY_PIN_NUM_CLK;
cfg.quadwp_io_num = -1;
cfg.quadhd_io_num = -1;
cfg.max_transfer_sz = 0;
cfg.flags = 0;
ESP_ERROR_CHECK(spi_bus_initialize(HOST, &cfg, 1));
// Configure device
max7219_t dev;
dev.cascade_size = 2;
dev.digits = 0;
dev.mirrored = true;
ESP_ERROR_CHECK(max7219_init_desc(&dev, HOST, MAX7219_MAX_CLOCK_SPEED_HZ, DISPLAY_PIN_NUM_CS));
ESP_ERROR_CHECK(max7219_init(&dev));
//0...15
ESP_ERROR_CHECK(max7219_set_brightness(&dev, 8)); //TODO add this to config
return dev;
//display = dev;
ESP_LOGI(TAG, "initializing display - done");
}
//===================================
//======= display welcome msg =======
//===================================
void display_ShowWelcomeMsg(max7219_t dev){
//display welcome message on two 7 segment displays
//show name and date
ESP_LOGI(TAG, "showing startup message...");
max7219_clear(&dev);
max7219_draw_text_7seg(&dev, 0, "CUTTER 29.09.2022");
// 1234567812 34 5678
vTaskDelay(pdMS_TO_TICKS(700));
//scroll "hello" over 2 displays
for (int offset = 0; offset < 23; offset++) {
max7219_clear(&dev);
char hello[40] = " HELL0 ";
max7219_draw_text_7seg(&dev, 0, hello + (22 - offset) );
vTaskDelay(pdMS_TO_TICKS(50));
}
//noticed rare bug that one display does not initialize / is not configured correctly after start
//initialize display again after the welcome message in case it did not work the first time
ESP_ERROR_CHECK(max7219_init(&dev));
ESP_ERROR_CHECK(max7219_set_brightness(&dev, 8)); //TODO add this to config
}
//---------------------------------
//---------- constructor ----------
//---------------------------------
handledDisplay::handledDisplay(max7219_t displayDevice, uint8_t posStart_f) {
ESP_LOGI(TAG, "Creating handledDisplay instance with startPos at %i", posStart);
//copy variables
dev = displayDevice;
posStart = posStart_f;
}
//--------------------------------
//---------- showString ----------
//--------------------------------
//function that displays a given string on the display
void handledDisplay::showString(const char * buf, uint8_t pos_f){
//calculate actual absolute position
posCurrent = posStart + pos_f;
//copy the desired string
strcpy(strOn, buf);
//exit blinking mode
if (mode == displayMode::BLINK_STRINGS){
mode = displayMode::NORMAL;
ESP_LOGI(TAG, "pos:%i - disable blink strings mode -> normal mode str='%s'", posStart, strOn);
}
handle(); //draws the text depending on mode
}
//TODO: blinkStrings() and blink() are very similar - can be optimized?
//only difficulty currently is the reset behaivor of blinkStrings through showString (blink does not reset)
//----------------------------------
//---------- blinkStrings ----------
//----------------------------------
//function switches between two strings in a given interval
void handledDisplay::blinkStrings(const char * strOn_f, const char * strOff_f, uint32_t msOn_f, uint32_t msOff_f){
//copy/update variables
strcpy(strOn, strOn_f);
strcpy(strOff, strOff_f);
msOn = msOn_f;
msOff = msOff_f;
//if changed to blink mode just now:
if (mode != displayMode::BLINK_STRINGS) {
//switch mode
ESP_LOGI(TAG, "pos:%i - toggle blink strings mode on/off=%d/%d stings='%s'/'%s'", posStart, msOn, msOff, strOn, strOff);
mode = displayMode::BLINK_STRINGS;
//start with on state
state = true;
timestampOn = esp_log_timestamp();
}
//run handle function for display update
handle();
}
//-------------------------------
//------------ blink ------------
//-------------------------------
//function triggers certain count and interval of off durations
void handledDisplay::blink(uint8_t count_f, uint32_t msOn_f, uint32_t msOff_f, const char * strOff_f) {
//copy/update parameters
count = count_f;
msOn = msOn_f;
msOff = msOff_f;
strcpy(strOff, strOff_f);
//FIXME this strings length must be dynamic depending on display size (posEnd - posStart) -> otherwise overwrites next segments if other display size or start pos
//if changed to blink mode just now:
if (mode != displayMode::BLINK) {
//set to blink mode
mode = displayMode::BLINK;
ESP_LOGI(TAG, "pos:%i - start blinking: count=%i on/off=%d/%d sting='%s'",posStart, count, msOn, msOff, strOff);
//start with off state
state = false;
timestampOff = esp_log_timestamp();
}
//run handle function for display update
handle();
}
//--------------------------------
//------------ handle ------------
//--------------------------------
//function that handles time based modes
//writes text to the 7 segment display depending on the current mode
void handledDisplay::handle() {
switch (mode){
case displayMode::NORMAL:
//daw given string
max7219_draw_text_7seg(&dev, posCurrent, strOn);
break;
case displayMode::BLINK:
case displayMode::BLINK_STRINGS:
//--- define state on/off ---
if (state == true){ //display in ON state
if (esp_log_timestamp() - timestampOn > msOn){
state = false;
timestampOff = esp_log_timestamp();
//decrement remaining counts in BLINK mode each cycle
if (mode == displayMode::BLINK) count--;
}
} else { //display in OFF state
if (esp_log_timestamp() - timestampOff > msOff) {
state = true;
timestampOn = esp_log_timestamp();
}
}
//--- draw text of current state ---
if (state) {
max7219_draw_text_7seg(&dev, posStart, strOn);
} else {
max7219_draw_text_7seg(&dev, posStart, strOff);
}
//--- check finished condition in BLINK mode ---
if (mode == displayMode::BLINK){
if (count == 0) {
mode = displayMode::NORMAL;
ESP_LOGI(TAG, "pos:%i - finished blinking -> normal mode", posStart);
}
}
break;
}
}