BeRTOS
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00001 00045 #ifndef DRV_TIMER_XMEGA_H 00046 #define DRV_TIMER_XMEGA_H 00047 00048 #include <hw/hw_cpufreq.h> /* CPU_FREQ */ 00049 00050 #include "cfg/cfg_timer.h" /* CONFIG_TIMER */ 00051 #include <cfg/compiler.h> /* uint8_t */ 00052 #include <cfg/macros.h> /* DIV_ROUND */ 00053 00054 #include <avr/io.h> 00055 #include <avr/interrupt.h> 00056 00057 /* 00058 * \name Values for CONFIG_TIMER. 00059 * 00060 * Select which hardware timer interrupt to use for system clock and softtimers. 00061 * $WIZ$ timer_select = "TIMER_USE_TCC0", "TIMER_USE_TCC1", "TIMER_USE_TCD0", "TIMER_USE_TCE0", "TIMER_USE_TCD1", "TIMER_DEFAULT" 00062 */ 00063 #define TIMER_USE_TCC0 1 00064 #define TIMER_USE_TCC1 2 00065 #define TIMER_USE_TCD0 3 00066 #define TIMER_USE_TCE0 4 00067 // The XMEGA A Family has one extra timer 00068 #ifdef CPU_AVR_XMEGA_A 00069 #define TIMER_USE_TCD1 5 00070 #endif 00071 00072 #define TIMER_DEFAULT TIMER_USE_TCC1 ///< Default system timer 00073 00074 /* 00075 * Hardware dependent timer initialization. 00076 */ 00077 #if (CONFIG_TIMER == TIMER_USE_TCC0) 00078 #define TIMER_OVF_VECT TCC0_OVF_vect 00079 #define TIMERCOUNTER TCC0 00080 #elif (CONFIG_TIMER == TIMER_USE_TCC1) 00081 #define TIMER_OVF_VECT TCC1_OVF_vect 00082 #define TIMERCOUNTER TCC1 00083 #elif (CONFIG_TIMER == TIMER_USE_TCD0) 00084 #define TIMER_OVF_VECT TCD0_OVF_vect 00085 #define TIMERCOUNTER TCD0 00086 #elif (CONFIG_TIMER == TIMER_USE_TCE0) 00087 #define TIMER_OVF_VECT TCE0_OVF_vect 00088 #define TIMERCOUNTER TCE0 00089 #elif (CONFIG_TIMER == TIMER_USE_TCD1) 00090 #define TIMER_OVF_VECT TCD1_OVF_vect 00091 #define TIMERCOUNTER TCD1 00092 #else 00093 #error Unimplemented value for CONFIG_TIMER 00094 #endif /* CONFIG_TIMER */ 00095 00096 //define the Interrupt Service Routine for this Timer Mode 00097 #define DEFINE_TIMER_ISR DECLARE_ISR_CONTEXT_SWITCH(TIMER_OVF_VECT) 00098 //define the Ticks per second we want 00099 #define TIMER_TICKS_PER_SEC 1000 00100 //define the Prescaler to use, which is dependend on the amount 00101 //of ticks per second, the maximum value for the TOP value of the 00102 //timer (0xFFFF) and the clock frequency. 00103 //The maximum clock frequency is 32Mhz, so as long as the TIMER_TICKS_PER_SEC 00104 //is larger then (about) 500 no prescaler is required. 00105 #define TIMER_PRESCALER 1 00106 //define the TOP/PERIOD value 00107 #define TIMER_PERIOD_VALUE DIV_ROUND(DIV_ROUND(CPU_FREQ, TIMER_PRESCALER), TIMER_TICKS_PER_SEC) 00108 //check if the TIMER_PRESCALER is large enough to accomate for the TIMER_TICKS_PER_SEC 00109 #if TIMER_PERIOD_VALUE > 0xFFFF 00110 #error Timer cannot generate the required Ticks per second, please adjust TIMER_PRESCALER 00111 #endif 00112 //define TIMER_HW_CNT it is used by the timer.c module to determine the 'edge' of the hardware counter 00113 #define TIMER_HW_CNT TIMER_PERIOD_VALUE 00114 00115 #define TIMER_HW_HPTICKS_PER_SEC DIV_ROUND(CPU_FREQ, TIMER_PRESCALER) 00116 00117 // Type of time expressed in ticks of the hardware high-precision timer 00118 typedef uint16_t hptime_t; 00119 #define SIZEOF_HPTIME_T 2 00120 00121 INLINE hptime_t timer_hw_hpread(void) 00122 { 00123 return (TIMERCOUNTER).CNT; 00124 } 00125 00126 /* Not needed, IRQ timer flag cleared automatically */ 00127 #define timer_hw_irq() do {} while (0) 00128 00129 /* Not needed, timer IRQ handler called only for timer source */ 00130 #define timer_hw_triggered() (true) 00131 00132 void timer_hw_init(void); 00133 00134 #endif /* DRV_TIMER_XMEGA_H */