Paparazzi UAS  v5.17_devel-3-g5993d39
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sys_time_arch.h
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23 
31 #ifndef SYS_TIME_ARCH_H
32 #define SYS_TIME_ARCH_H
33 
34 #include "mcu_periph/sys_time.h"
35 
36 #include BOARD_CONFIG
37 #include "LPC21xx.h"
38 #include "armVIC.h"
39 
40 #include "std.h"
41 
42 void TIMER0_ISR(void) __attribute__((naked));
43 
44 /* T0 prescaler, set T0_CLK to 15MHz, T0_CLK = PCLK / T0PCLK_DIV */
45 #if (PCLK == 15000000)
46 #define T0_PCLK_DIV 1
47 
48 #elif (PCLK == 30000000)
49 #define T0_PCLK_DIV 2
50 
51 #elif (PCLK == 60000000)
52 #define T0_PCLK_DIV 4
53 
54 #else
55 #error unknown PCLK frequency
56 #endif
57 
58 #ifndef TIMER0_VIC_SLOT
59 #define TIMER0_VIC_SLOT 1
60 #endif /* TIMER0_VIC_SLOT */
61 
67 static inline uint32_t get_sys_time_usec(void)
68 {
69  return usec_of_cpu_ticks(T0TC);
70 }
71 
76 static inline uint32_t get_sys_time_msec(void)
77 {
78  return msec_of_cpu_ticks(T0TC);
79 }
80 
81 
82 #define SysTickTimerStart(_t) { _t = T0TC; }
83 #define SysTickTimer(_t) ((uint32_t)(T0TC - _t))
84 #define SysTickTimerStop(_t) { _t = (T0TC - _t); }
85 
87 static inline void sys_time_usleep(uint32_t us)
88 {
89  uint32_t start = T0TC;
91  while ((uint32_t)(T0TC - start) < ticks);
92 }
93 
94 #endif /* SYS_TIME_ARCH_H */
static uint32_t msec_of_cpu_ticks(uint32_t cpu_ticks)
Definition: sys_time.h:193
void TIMER0_ISR(void)
static uint32_t usec_of_cpu_ticks(uint32_t cpu_ticks)
Definition: sys_time.h:198
Architecture independent timing functions.
uint32_t get_sys_time_usec(void)
Get the time in microseconds since startup.
Definition: sys_time_arch.c:68
#define T0TC
Definition: LPC21xx.h:52
unsigned long uint32_t
Definition: types.h:18
int ticks
Definition: gps_sirf.c:193
void sys_time_usleep(uint32_t us)
sys_time_usleep(uint32_t us)
Definition: sys_time_arch.c:95
uint32_t get_sys_time_msec(void)
Get the time in milliseconds since startup.
Definition: sys_time_arch.c:78
static uint32_t cpu_ticks_of_usec(uint32_t usec)
Definition: sys_time.h:178