add gui system and demo screen with handled keyboard input

src/app_io.c

@@ -0,0 +1,30 @@
+/**
+ * TODO file description
+ */
+
+#include <stdbool.h>
+#include <hardware/gpio.h>
+#include <hardware/adc.h>
+#include "app_io.h"
+#include "pinout.h"
+
+
+void set_relays(bool one, bool two, bool three, bool four) {
+    gpio_put(PIN_RE1, one);
+    gpio_put(PIN_RE2, two);
+    gpio_put(PIN_RE3, three);
+    gpio_put(PIN_RE1, four);
+}
+
+void open_valve(uint8_t num) {
+    gpio_put(PIN_RE1, num == 1);
+    gpio_put(PIN_RE2, num == 2);
+    gpio_put(PIN_RE3, num == 3);
+    gpio_put(PIN_RE4, num == 4);
+}
+
+uint16_t moisture_read() {
+    adc_select_input(ADC_NUM_MOISTURE);
+    return adc_read();
+}
+

src/app_io.h

@@ -0,0 +1,17 @@
+/**
+ * TODO file description
+ */
+
+#ifndef ZAVLAHA_APP_IO_H
+#define ZAVLAHA_APP_IO_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+void set_relays(bool one, bool two, bool three, bool four);
+
+void open_valve(uint8_t num);
+
+uint16_t moisture_read();
+
+#endif //ZAVLAHA_APP_IO_H

src/main.c

@@ -4,11 +4,13 @@
 #include <hardware/i2c.h>
 #include <hardware/adc.h>
 #include <hardware/irq.h>
+#include <hardware/sync.h>
 #include "pinout.h"
 #include "lcd.h"
 #include "ds_rtc.h"
 #include "ee.h"
 #include "lcd/lcdbuf.h"
+#include "screens/app_gui.h"
 
 /*
 
@@ -49,37 +51,26 @@ void setup_output(uint num)
     gpio_set_function(num, GPIO_FUNC_SIO);
 }
 
+#define KEYPAD_BUFFER_LEN 10
+static uint8_t keypad_buffer[KEYPAD_BUFFER_LEN];
+static uint8_t keypad_buffer_wp = 0;
+static uint8_t keypad_buffer_rp = 0;
+
 // RX interrupt handler
 void irq_uart() {
     while (uart_is_readable(uart0)) {
         uint8_t ch = uart_getc(uart0);
 
-        // TODO do something useful
-        if (uart_is_writable(uart0)) {
-            uart_putc(uart0, ch);
+        if (keypad_buffer[keypad_buffer_wp] == 0) {
+            keypad_buffer[keypad_buffer_wp] = ch;
+            keypad_buffer_wp++;
+            if (keypad_buffer_wp >= KEYPAD_BUFFER_LEN) {
+                keypad_buffer_wp = 0;
+            }
         }
     }
 }
 
-void set_relays(bool one, bool two, bool three, bool four) {
-    gpio_put(PIN_RE1, one);
-    gpio_put(PIN_RE2, two);
-    gpio_put(PIN_RE3, three);
-    gpio_put(PIN_RE1, four);
-}
-
-void open_valve(uint num) {
-    gpio_put(PIN_RE1, num == 1);
-    gpio_put(PIN_RE2, num == 2);
-    gpio_put(PIN_RE3, num == 3);
-    gpio_put(PIN_RE4, num == 4);
-}
-
-uint16_t moisture_read() {
-    adc_select_input(ADC_NUM_MOISTURE);
-    return adc_read();
-}
-
 int main()
 {
     // picotool binary info
@@ -134,24 +125,44 @@ int main()
 
     lcd_init();
 
-    struct LcdBuffer lcd;
-    LcdBuffer_Init(&lcd, CGROM_A00, CGRAM_CZ);
+    gui_init();
 
-    LcdBuffer_Write(&lcd, 0, 0, "ěščřŽÝÁÍ pyčo!");
-    LcdBuffer_Flush(&lcd);
-
-    char buf[100];
-    while (1) {
-        struct rtc_time time;
-        if (0 == rtc_get_time(&time)) {
-            sprintf(buf, "čas: %02d:%02d:%02d", time.hour, time.minute, time.second);
-            LcdBuffer_Write(&lcd, 2, 2, buf);
+    for(;;) {
+        uint32_t interrupts = save_and_disable_interrupts();
+        GuiEvent event = GUI_EVENT_NONE;
+        if (keypad_buffer[keypad_buffer_rp] != 0) {
+            char ch = keypad_buffer[keypad_buffer_rp];
+            keypad_buffer[keypad_buffer_rp] = 0;
+            keypad_buffer_rp++;
+            if (keypad_buffer_rp >= KEYPAD_BUFFER_LEN) {
+                keypad_buffer_rp = 0;
+            }
+            event = ch; // there is 1:1 mapping for keypad ASCII
         }
-        LcdBuffer_Flush(&lcd);
+        restore_interrupts(interrupts);
 
-        sleep_ms(1000);
+        gui_loop_iter(event);
     }
 
+//
+//    struct LcdBuffer lcd;
+//    LcdBuffer_Init(&lcd, CGROM_A00, CGRAM_CZ);
+//
+//    LcdBuffer_Write(&lcd, 0, 0, "ěščřŽÝÁÍ pyčo!");
+//    LcdBuffer_Flush(&lcd);
+//
+//    char buf[100];
+//    while (1) {
+//        struct rtc_time time;
+//        if (0 == rtc_get_time(&time)) {
+//            sprintf(buf, "čas: %02d:%02d:%02d", time.hour, time.minute, time.second);
+//            LcdBuffer_Write(&lcd, 2, 2, buf);
+//        }
+//        LcdBuffer_Flush(&lcd);
+//
+//        sleep_ms(1000);
+//    }
+
 #if 0
 
 //    while (1) {

src/screens/app_gui.c

@@ -0,0 +1,83 @@
+/**
+ * TODO file description
+ */
+
+#include <stdbool.h>
+#include <string.h>
+#include "app_gui.h"
+#include "../lcd/lcdbuf.h"
+
+struct State s_app = {};
+
+struct LcdBuffer lcd = {};
+
+/** Schedule paint (the screen func will be called with the PAINT event argument */
+void request_paint() {
+    s_app.paint_needed = true;
+}
+
+/** Draw the common overlay / HUD (with temperatures and heater status) */
+static void draw_common_overlay();
+
+char stmp[100];
+
+/** Main loop */
+void gui_init()
+{
+    switch_screen(screen_home, true);
+    s_app.last_tick_time = timestamp();
+
+    LcdBuffer_Init(&lcd, CGROM_A00, CGRAM_CZ);
+}
+
+void gui_loop_iter(GuiEvent message) {
+    uint32_t tickNow = timestamp();
+
+    // 10ms tick event
+    if (tickNow - s_app.last_tick_time > 10) {
+        s_app.screen(GUI_EVENT_SCREEN_TICK);
+        s_app.last_tick_time = tickNow;
+    }
+
+    if (message != GUI_EVENT_NONE) {
+        s_app.screen(message);
+    }
+
+    if (message >= 32) { // lazy shortcut so we dont have to list all of them
+        // key was pressed
+        input_sound_effect();
+    }
+
+    if (s_app.paint_needed) {
+        s_app.paint_needed = false;
+
+        draw_common_overlay();
+        s_app.screen(GUI_EVENT_PAINT);
+
+        // If there is anything to print, do it
+        LcdBuffer_Flush(&lcd);
+    }
+}
+
+/** Switch to a different screen handler.
+ * If "init" is true, immediately call it with the init event. */
+void switch_screen(screen_t pScreen, bool init) {
+    s_app.screen = pScreen;
+
+    LcdBuffer_Clear(&lcd);
+    request_paint();
+
+    if (init) {
+        pScreen(GUI_EVENT_SCREEN_INIT);
+    }
+}
+
+/** Draw GUI common to all screens */
+static void draw_common_overlay() {
+    // TODO
+}
+
+/** Play input sound effect if this is an input event */
+void input_sound_effect() {
+    // TODO
+}

src/screens/app_gui.h

@@ -0,0 +1,63 @@
+/**
+ * TODO file description
+ */
+
+#ifndef ZAVLAHA_APP_GUI_H
+#define ZAVLAHA_APP_GUI_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <pico/time.h>
+#include "gui_event.h"
+#include "lcd/lcdbuf.h"
+
+/// Temporary scratch buffer
+extern char stmp[100];
+
+extern struct LcdBuffer lcd;
+
+/**
+ * Screen callback type. The event is either INIT, PAINT, or one of the input events.
+ */
+typedef void (*screen_t)(GuiEvent event);
+
+
+static inline uint32_t timestamp() {
+    return to_ms_since_boot(get_absolute_time());
+}
+
+/** Input beep (push or knob turn) */
+void input_sound_effect();
+
+
+void gui_loop_iter(GuiEvent message);
+void gui_init();
+
+/** Switch to a different screen. Handles initial push state handling (so release
+ * does not cause a "click" event).
+ *
+ * @param pScreen - screen to switch to
+ * @param init - call the INIT event immediately after
+ */
+void switch_screen(screen_t pScreen, bool init);
+
+void request_paint();
+
+// prototypes for screen handlers
+
+void screen_home(GuiEvent event);
+// XXX other prototypes
+
+struct State {
+  /// Repaint was requested from the screen code
+  bool paint_needed;
+
+  /// Pointer to the currently active screen func
+  screen_t screen;
+
+  uint32_t last_tick_time;
+};
+
+extern struct State s_app;
+
+#endif //ZAVLAHA_APP_GUI_H

src/screens/gui_event.h

@@ -0,0 +1,38 @@
+//
+// Created by MightyPork on 2023/04/09.
+//
+
+#ifndef ZAVLAHA_GUI_EVENT_H
+#define ZAVLAHA_GUI_EVENT_H
+
+// sent through the notify queue
+typedef enum GuiEvent {
+  /// No event, zero; This is a default value.
+  GUI_EVENT_NONE = 0,
+  /// Cause redraw
+  GUI_EVENT_PAINT = 0,
+  /// Used as the argument when initing a screen
+  GUI_EVENT_SCREEN_INIT = 1,
+  /// Time tick, used to carry timing to the screen functions.
+  /// This tick has 10ms interval
+  GUI_EVENT_SCREEN_TICK = 2,
+  /// Keypad
+  GUI_EVENT_KEY_0 = '0',
+  GUI_EVENT_KEY_1,
+  GUI_EVENT_KEY_2,
+  GUI_EVENT_KEY_3,
+  GUI_EVENT_KEY_4,
+  GUI_EVENT_KEY_5,
+  GUI_EVENT_KEY_6,
+  GUI_EVENT_KEY_7,
+  GUI_EVENT_KEY_8,
+  GUI_EVENT_KEY_9,
+  GUI_EVENT_KEY_A = 'A',
+  GUI_EVENT_KEY_B,
+  GUI_EVENT_KEY_C,
+  GUI_EVENT_KEY_D,
+  GUI_EVENT_KEY_STAR = '*',
+  GUI_EVENT_KEY_HASH = '#',
+} GuiEvent;
+
+#endif //ZAVLAHA_GUI_EVENT_H

src/screens/screen_home.c

@@ -0,0 +1,59 @@
+/**
+ * TODO file description
+ */
+//
+// Created by MightyPork on 2023/04/09.
+//
+
+#include <stdio.h>
+#include <string.h>
+#include "app_gui.h"
+#include "gui_event.h"
+#include "ds_rtc.h"
+#include "app_io.h"
+
+static uint32_t last_time = 0;
+static struct rtc_time rtc_time = {};
+static uint16_t moisture = 0;
+
+static char showbuf[20];
+static uint8_t showbuf_wp = 0;
+
+void screen_home(GuiEvent event)
+{
+    uint32_t now = timestamp();
+    uint32_t elapsed = now - last_time;
+
+    switch (event) {
+        case GUI_EVENT_SCREEN_INIT:
+            memset(showbuf, ' ', sizeof(showbuf));
+            // pass
+        case GUI_EVENT_SCREEN_TICK:
+            if (elapsed >= 100) {
+                last_time = now;
+                rtc_get_time(&rtc_time);
+                moisture = moisture_read();
+                request_paint();
+            }
+            break;
+
+        case GUI_EVENT_PAINT:;
+            LcdBuffer_Write(&lcd, 0, 0, showbuf);
+
+            sprintf(stmp, "Čas: %02d:%02d:%02d", rtc_time.hour, rtc_time.minute, rtc_time.second);
+            LcdBuffer_Write(&lcd, 1, 0, stmp);
+
+            sprintf(stmp, "Vlhkost: %4d", moisture);
+            LcdBuffer_Write(&lcd, 2, 0, stmp);
+            break;
+
+        default:
+            if (event >= 32) {
+                showbuf[showbuf_wp++] = event;
+                if (showbuf_wp == 20) {
+                    showbuf_wp = 0;
+                }
+                request_paint();
+            }
+    }
+}