diff options
Diffstat (limited to 'app/t.c')
-rw-r--r-- | app/t.c | 105 |
1 files changed, 105 insertions, 0 deletions
@@ -0,0 +1,105 @@ +#include "project.h" + + +static volatile uint32_t delay_hms_count; +static volatile uint32_t ticks; +static uint32_t scale = 7; + +void +delay_us (uint32_t d) +{ + d *= scale; + + while (d--) + __asm__ ("nop"); +} + + +void +sys_tick_handler (void) +{ + if (delay_hms_count) + delay_hms_count--; + + + led_tick(); + ot_phy_tx_tick(); + ot_tick(); + onewire_tick(); + temp_tick(); + adc_tick(); + pressure_tick(); + + + ticks++; +} + + + +void +delay_ms (uint32_t d) +{ + delay_hms_count = d << 1; + + while (delay_hms_count); +} + +#if 0 +int +timed_out (uint32_t then, unsigned int ms) +{ + then = ticks - then; + + if (then > ms) + return 1; + + return 0; +} + +int +timed_out_cycles (uint32_t then, unsigned int cycles) +{ + then = dwt_read_cycle_counter() - then; + + if (then > cycles) + return 1; + + return 0; +} +#endif + + + +void +ticker_init (void) +{ + uint32_t v, w; + + /*Start periodic timer */ + + systick_set_clocksource (STK_CSR_CLKSOURCE_AHB_DIV8); + /* 72MHz / 8 = > 9Mhz */ + systick_set_reload (4500); + /* 9MHz / 4500 => 2kHz */ + systick_interrupt_enable(); + systick_counter_enable(); + + /*Calibrate the delay loop */ + + + + do { + scale--; + v = ticks; + + while (v == ticks); + + delay_us (500); + w = ticks; + v++; + w -= v; + } while (w); + + + +} |