// *************************************************************************************************
// @fn CW_Send_Char
// @brief Send (via the buzzer) an alphanumeric character ("letter")
// @param letter character to send, in range 39 (''') to 90 ('Z'), inclusive
// @return none
// *************************************************************************************************
void CW_Send_Char(u8 letter)
{
if ((letter >= 39) && (letter <= 90)) { // In range
letter = CW_Char[letter - 39]; // Get first "letter"
//gibbons TODO: check if '=' operator or memcpy(...) is more appropriate
}
else if (letter == ' ') { // Send space (inter-word pause)
Timer0_A4_Delay(CONV_MS_TO_TICKS(CW_WORD_PAUSE * CW_DOT_LENGTH));
return;
}
else { // Invalid character
return;
}
int i = 0x80; // Mask bit, starting at 0x80 = 1000 0000b
while (i > letter) i >>= 1; // Find start bit
i >>= 1; // Needed to skip over start bit, otherwise all letters start with an extra DASH!
while (i > 0) {
if (i & letter) { // Send dash (and pause after it)
start_buzzer(1, CONV_MS_TO_TICKS(3*CW_DOT_LENGTH), CONV_MS_TO_TICKS(CW_SIGNAL_PAUSE * CW_DOT_LENGTH));
}
else { // Send dot (and pause after it)
start_buzzer(1, CONV_MS_TO_TICKS(CW_DOT_LENGTH), CONV_MS_TO_TICKS(CW_SIGNAL_PAUSE * CW_DOT_LENGTH));
}
i >>= 1; // Move mask bit to the right one
// Wait until finished buzzing
while (is_buzzer()) {
Timer0_A4_Delay(CONV_MS_TO_TICKS(2*CW_DOT_LENGTH)); // Go into LPM3
}
}
// Now send inter-letter pause (space between successive letters)
Timer0_A4_Delay(CONV_MS_TO_TICKS(CW_LETTER_PAUSE * CW_DOT_LENGTH));
// Clean up display
display.flag.full_update = 1;
}
// *************************************************************************************************
// @fn idle_loop
// @brief Go to LPM. Service watchdog timer when waking up.
// @param none
// @return none
// *************************************************************************************************
void idle_loop(void)
{
#ifdef CONFIG_CW_TIME
// what I'd like to do here is set a morsepos variable
// if non-zero it is how many digits we have left to go
// on sending the time.
// we also would have a morse var that would only get set
// the first send and reset when not in view so we'd only
// send the time once
#define CW_DIT_LEN CONV_MS_TO_TICKS(50) // basic element size (100mS)
static int morse=0; // should send morse == 1
static int morsepos=0; // position in morse time (10 hour =1, hour=2, etc.)
static int morsehr; // cached hour for morse code
static int morsemin; // cached minute for morse code
static int morsedig=-1; // current digit
static int morseel; // current element in digit (always 5 elements max)
static unsigned int morseinitdelay; // start up delay
// We only send the time in morse code if the seconds display is active, and then only
// once per activation
if (sTime.line1ViewStyle == DISPLAY_ALTERNATIVE_VIEW)
{
if (!morse) // this means its the first time (we reset this to zero in the else)
{
morse=1; // mark that we are sending
morsepos=1; // initialize pointer
// Jim pointed out it is remotely possible that a button
// int could wake up this routine and then the hour could
// flip over after reading so I added this "do" loop
do {
morsehr=sTime.hour; // and cache
morsemin=sTime.minute;
} while (morsehr!=sTime.hour);
morsedig=-1; // not currently sending digit
morseinitdelay=45000; // delay for a bit before starting so the key beep can quiet down
}
if (morseinitdelay) // this handles the initial delay
{
morseinitdelay--;
return; // do not sleep yet or no event will get scheduled and we'll hang for a very long time
}
if (!is_buzzer() && morsedig==-1) // if not sending anything
{
morseel=0; // start a new character
switch (morsepos++) // get the right digit
{
case 1:
morsedig=morsehr/10;
break;
case 2:
morsedig=morsehr%10;
break;
case 3:
morsedig=morsemin/10;
break;
case 4:
morsedig=morsemin%10;
break;
default:
morsepos=5; // done for now
}
if (morsedig==0)
morsedig=10; // treat zero as 10 for code algorithm
}
// now we have a digit and we need to send element
if (!is_buzzer()&&morsedig!=-1)
{
int digit=morsedig;
// assume we are sending dit for 1-5 or dah for 6-10 (zero is 10)
int ditdah=(morsedig>5)?1:0;
int dit=CW_DIT_LEN;
if (digit>=6)
digit-=5; // fold digits 6-10 to 1-5
if (digit>=++morseel)
ditdah=ditdah?0:1; // flip dits and dahs at the right point
// send the code
start_buzzer(1,ditdah?dit:(3*dit),(morseel>=5)?10*dit:dit);
// all digits have 5 elements
if (morseel==5)
morsedig=-1;
}
} else {
morse=0; // no morse code right now
}
#endif
// To low power mode
to_lpm();
#ifdef USE_WATCHDOG
// Service watchdog (reset counter)
WDTCTL = (WDTCTL &0xff) | WDTPW | WDTCNTCL;
#endif
}