From c2404c307c569b4bdc0b9de1174988c799e5ec84 Mon Sep 17 00:00:00 2001
From: Wielebny666 <avraqua@hot.pl>
Date: Wed, 29 Apr 2020 13:24:07 +0200
Subject: [PATCH] Adjusting min and max values to the number format

---
 src/lv_misc/lv_math.c    | 20 ++++++++++++++++++++
 src/lv_misc/lv_math.h    |  8 ++++++++
 src/lv_objx/lv_spinbox.c |  7 +++++++
 src/lv_objx/lv_spinbox.h |  2 +-
 4 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/lv_misc/lv_math.c b/src/lv_misc/lv_math.c
index f015456e4..74ddbe49c 100644
--- a/src/lv_misc/lv_math.c
+++ b/src/lv_misc/lv_math.c
@@ -198,6 +198,26 @@ uint32_t lv_sqrt(uint32_t num)
     return root;
 }
 
+/**
+ * Calculate the integer exponents.
+ * @param base
+ * @param power
+ * @return base raised to the power exponent
+ */
+int64_t lv_pow(int64_t base, int8_t exp)
+{
+	int64_t result = 1;
+    while (exp)
+    {
+        if (exp & 1)
+            result *= base;
+        exp >>= 1;
+        base *= base;
+    }
+
+    return result;
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/
diff --git a/src/lv_misc/lv_math.h b/src/lv_misc/lv_math.h
index 0f93a7c6a..7fadc8590 100644
--- a/src/lv_misc/lv_math.h
+++ b/src/lv_misc/lv_math.h
@@ -74,6 +74,14 @@ uint16_t lv_atan2(int x, int y);
  */
 uint32_t lv_sqrt(uint32_t num);
 
+/**
+ * Calculate the integer exponents.
+ * @param base
+ * @param power
+ * @return base raised to the power exponent
+ */
+int64_t lv_pow(int64_t base, int8_t exp);
+
 /**********************
  *      MACROS
  **********************/
diff --git a/src/lv_objx/lv_spinbox.c b/src/lv_objx/lv_spinbox.c
index 21a19205d..e89570856 100644
--- a/src/lv_objx/lv_spinbox.c
+++ b/src/lv_objx/lv_spinbox.c
@@ -154,6 +154,13 @@ void lv_spinbox_set_digit_format(lv_obj_t * spinbox, uint8_t digit_count, uint8_
 
     if(separator_position > LV_SPINBOX_MAX_DIGIT_COUNT) separator_position = LV_SPINBOX_MAX_DIGIT_COUNT;
 
+    if(digit_count < LV_SPINBOX_MAX_DIGIT_COUNT)
+    {
+        uint64_t max_val = lv_pow(10, digit_count);
+        if(ext->range_max > max_val - 1) ext->range_max = max_val - 1;
+        if(ext->range_min < - max_val  + 1) ext->range_min = - max_val  + 1;
+    }
+
     ext->digit_count   = digit_count;
     ext->dec_point_pos = separator_position;
 
diff --git a/src/lv_objx/lv_spinbox.h b/src/lv_objx/lv_spinbox.h
index 396159590..5e7f3c17d 100644
--- a/src/lv_objx/lv_spinbox.h
+++ b/src/lv_objx/lv_spinbox.h
@@ -32,7 +32,7 @@ extern "C" {
 /*********************
  *      DEFINES
  *********************/
-#define LV_SPINBOX_MAX_DIGIT_COUNT 16
+#define LV_SPINBOX_MAX_DIGIT_COUNT 10
 
 /**********************
  *      TYPEDEFS