delaying slightly longer than requested. */
void prep_timer()
{
- BCSCTL2 = 0x00; /* In particular, use DCOCLK as SMCLK source with
- divider 1. Hence, Timer A ticks with system
- clock at 16 MHz. */
+ BCSCTL2 = 0x00; /* In particular, use DCOCLK as SMCLK source with
+ divider 1. Hence, Timer A ticks with system
+ clock at 16 MHz. */
- TACTL = 0x0204; /* Driven by SMCLK; disable Timer A interrupts;
- reset timer in case it was previously in use */
+ TACTL = 0x0204; /* Driven by SMCLK; disable Timer A interrupts;
+ reset timer in case it was previously in use */
}
//! Delay for specified number of milliseconds (given 16 MHz clock)
void delay_ms( unsigned int ms )
{
- // 16000 ticks = 1 ms
- TACTL |= 0x20; // Start timer!
- while (ms--) {
- while (TAR < 16000)
- asm( "nop" );
- TACTL = 0x0224;
- }
- TACTL = 0x0204; // Reset Timer A, till next time
+ // 16000 ticks = 1 ms
+ TACTL |= 0x20; // Start timer!
+ while (ms--) {
+ while (TAR < 16000)
+ asm( "nop" );
+ TACTL = 0x0224;
+ }
+ TACTL = 0x0204; // Reset Timer A, till next time
}
//! Delay for specified number of microseconds (given 16 MHz clock)
void delay_us( unsigned int us )
{
- // 16 ticks = 1 us
- TACTL |= 0x20; // Start timer!
- while (us--) {
- while (TAR < 16)
- asm( "nop" );
- TACTL = 0x0224;
- }
- TACTL = 0x0204; // Reset Timer A, till next time
+ // 16 ticks = 1 us
+ TACTL |= 0x20; // Start timer!
+ while (us--) {
+ while (TAR < 16)
+ asm( "nop" );
+ TACTL = 0x0224;
+ }
+ TACTL = 0x0204; // Reset Timer A, till next time
}
//! Delay for specified number of clock ticks (16 MHz clock implies 62.5 ns per tick).
void delay_ticks( unsigned int num_ticks )
{
- TACTL |= 0x20; // Start timer
- while (TAR < num_ticks)
- asm( "nop" );
- TACTL = 0x0204; // Reset Timer A, till next time
+ TACTL |= 0x20; // Start timer
+ while (TAR < num_ticks)
+ asm( "nop" );
+ TACTL = 0x0204; // Reset Timer A, till next time
}