From b3df20a08974584076e802d5f7061a8a8cb96930 Mon Sep 17 00:00:00 2001 From: root Date: Thu, 16 Jul 2015 08:35:16 +0100 Subject: initial commit --- app/ticker.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 app/ticker.c (limited to 'app/ticker.c') diff --git a/app/ticker.c b/app/ticker.c new file mode 100644 index 0000000..6ffff31 --- /dev/null +++ b/app/ticker.c @@ -0,0 +1,51 @@ +#include "project.h" + +static volatile uint32_t delay_ms_count; +uint32_t ticks; + +void +delay_us (uint32_t d) +{ + d *= 36; + while (d--) + { + __asm__ ("nop"); + } +} + +void +sys_tick_handler (void) +{ + if (delay_ms_count) + delay_ms_count--; + + ticks++; + + led_tick (); + lcd_refresh_wdt (); +} + + + +void +delay_ms (uint32_t d) +{ + delay_ms_count = d; + while (delay_ms_count); +} + + +void +ticker_init (void) +{ + + /*Start periodic timer */ + systick_set_clocksource (STK_CSR_CLKSOURCE_AHB_DIV8); + /* 48MHz / 8 = > 6Mhz */ + systick_set_reload (6000); + /* 6MHz / 6000 => 1kHz */ + systick_interrupt_enable (); + systick_counter_enable (); + + +} -- cgit v1.2.3