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| author | Kevin O'Connor <kevin@koconnor.net> | 2018-10-18 09:37:47 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2018-10-18 09:37:47 -0400 |
| commit | 8fca90844524993feb8f9dc7cfc4586ac86f2fb5 (patch) | |
| tree | 496dfb5552c9aec38b18071e4e329fb712f3300a /src/lpc176x/timer.c | |
| parent | 0079311b0bb23aed886c5673a6dbef13a8f35317 (diff) | |
| download | kutter-8fca90844524993feb8f9dc7cfc4586ac86f2fb5.tar.gz kutter-8fca90844524993feb8f9dc7cfc4586ac86f2fb5.tar.xz kutter-8fca90844524993feb8f9dc7cfc4586ac86f2fb5.zip | |
lpc176x: Divide system clock within timer; not on system bus
Scaling the timer on the system bus has a notable impact on
performance. So, scale the timer within the timer hardware itself.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/lpc176x/timer.c')
| -rw-r--r-- | src/lpc176x/timer.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/lpc176x/timer.c b/src/lpc176x/timer.c index d8196329..1b966d1c 100644 --- a/src/lpc176x/timer.c +++ b/src/lpc176x/timer.c @@ -37,6 +37,9 @@ timer_init(void) { // Disable timer LPC_TIM0->TCR = 0x02; + // Setup clock and prescaler (divide sys clock by 4) + LPC_SC->PCLKSEL0 = (LPC_SC->PCLKSEL0 & ~(0x3<<2)) | (0x1<<2); + LPC_TIM0->PR = 3; // Enable interrupts NVIC_SetPriority(TIMER0_IRQn, 2); NVIC_EnableIRQ(TIMER0_IRQn); |