basic button handler routines added, hard buttons tested

touch sensors were also preliminary tested but not all have been analyzed yet.

firmware/app/ui/btn.c

@@ -3,4 +3,99 @@
  */
 
 #include "ch32x035_conf.h"
-#include "driver/adc.h"
+#include "btn.h"
+
+#include "driver/adc.h"
+
+
+
+BtnSub btn[BTN_COUNT];
+
+uint16_t btn_pushed;
+uint16_t btn_held;
+
+
+
+void btn_push_cb(uint8_t idx)
+{
+    if (!(btn_pushed & (1 << idx))) {
+        btn_pushed |= (1 << idx);
+        if (btn[idx].cb_push) btn[idx].cb_push(idx);
+    }
+}
+
+void btn_hold_cb(uint8_t idx)
+{
+    btn_held |= (1 << idx);
+    if (btn[idx].cb_hold) btn[idx].cb_hold(idx);
+}
+
+void btn_release_cb(uint8_t idx)
+{
+    btn_pushed &= ~(1 << idx);
+    btn_held   &= ~(1 << idx);
+    if (btn[idx].cb_release) btn[idx].cb_release(idx);
+}
+
+void btn_process()
+{
+    uint16_t i;
+	uint32_t x;
+    uint16_t btn_state[4] = {0};
+
+    // fill button bitfield
+    for (i = 0; i < BTN_COUNT; i++) {
+        if (i == 0) {
+			// GPIOC pulldown button
+			x = GPIOC->INDR & (1 << 10);			// PC10 (or PC17)
+        } else if (i < 3) {
+			// GPIOB pullup buttons
+			x = !(GPIOB->INDR & (1 << (i + 10)));	// PB11, PB12
+		} else {
+            // touch sensors
+            x = adc_get_tkey(i - 3);
+        }
+
+        // is pushed?
+        if (x) {
+            if (btn[i].hold != 0xffff)
+                btn[i].hold++;
+            
+            if (btn[i].hold == DEBOUNCE) {
+                btn_state[1] |= (1 << (i + 3));
+            }
+        }
+        
+        // is held?
+        if (btn[i].hold == HOLD_COUNTS) {
+            btn_state[2] |= (1 << (i + 3));
+        }
+
+        // is repeated?
+        if (btn[i].repeat && (btn[i].hold == (HOLD_COUNTS + btn[i].repeat))) {
+            btn_state[2] |= (1 << (i + 3));
+            btn[i].hold = HOLD_COUNTS;
+        }
+
+        // is released?
+        if (!x) {
+            if (btn[i].hold) {
+                btn[i].hold = 0;
+                btn_state[3] |= (1 << (i + 3));
+            }
+        }
+    }
+
+    // process callbacks for new events
+    for (i = 0; i < BTN_COUNT; i++) {
+        if (btn_state[1] & (1 << i)) {
+            btn_push_cb(i);
+        }
+        if (btn_state[2] & (1 << i)) {
+            btn_hold_cb(i);
+        }
+        if (btn_state[3] & (1 << i)) {
+            btn_release_cb(i);
+        }
+    }
+}