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Resistor calculator: Support Gigaohms in resistor to colour conversion, and guard against values that can not be represented

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28275 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Frank Gevaerts 2010-10-13 21:52:45 +00:00
parent ed869242e4
commit 7d6c73a1c1
1 changed files with 20 additions and 6 deletions
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26
apps/plugins/resistor.c
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@ -167,7 +167,7 @@ static int powi(int num, int exp)
static enum color get_band_rtoc(int in_val)
{
int return_color = 0;
int return_color = RES_INVALID;
switch(in_val) {
case 0:
return_color = RES_BLACK;
@ -808,7 +808,8 @@ static void resistance_to_color(void)
rb->lcd_clear_display();
rb->splash(HZ/2, "Resistance to Colour");
MENUITEM_STRINGLIST(r_to_c_menu, "Select unit to use:", NULL,
"Ohms", "Kiloohms (KOhms)", "Megaohms (MOhms)");
"Ohms", "Kiloohms (KOhms)", "Megaohms (MOhms)",
"Gigaohms (GOhms)");
MENUITEM_STRINGLIST(r_to_c_menu_tol, "Tolerance to display:", NULL,
"5%", "10%", "1%", "2%", "20%");
@ -848,19 +849,23 @@ static void resistance_to_color(void)
switch(menu_selection) {
case 0:
power_ten=0;
units_used = RES_BLACK;
break;
case 1: /* KOhms */
power_ten=3;
units_used = RES_ORANGE;
kbd_input_int *= 1000;
break;
case 2: /* MOhms */
power_ten=6;
units_used = RES_BLUE;
kbd_input_int *= 1000000;
break;
case 3: /* GOhms */
power_ten=9;
units_used = RES_WHITE;
break;
}
power_ten=0;
temp=kbd_input_int;
while(temp>=100)
{
@ -869,10 +874,19 @@ static void resistance_to_color(void)
}
first_band_int=temp/10;
second_band_int=temp%10;
first_band = get_band_rtoc(first_band_int);
second_band = get_band_rtoc(second_band_int);
multiplier = get_band_rtoc(power_ten);
if( first_band == RES_INVALID
|| second_band == RES_INVALID
|| multiplier == RES_INVALID)
{
rb->splashf(HZ, "%d %s can not be represented",
in_resistance_int,band_data[units_used].unit);
return;
}
rb->lcd_clear_display();
lineno = INITIAL_TEXT_Y;