diff options
Diffstat (limited to 'nuttx/arch/arm/src/tiva/tiva_timer.h')
| -rw-r--r-- | nuttx/arch/arm/src/tiva/tiva_timer.h | 117 |
1 files changed, 98 insertions, 19 deletions
diff --git a/nuttx/arch/arm/src/tiva/tiva_timer.h b/nuttx/arch/arm/src/tiva/tiva_timer.h index 6d6fa80cf..e367d542f 100644 --- a/nuttx/arch/arm/src/tiva/tiva_timer.h +++ b/nuttx/arch/arm/src/tiva/tiva_timer.h @@ -476,63 +476,142 @@ static inline void tiva_timer16b_setload(TIMER_HANDLE handle, uint16_t load) } /**************************************************************************** - * Name: tiva_timer32_setmatch + * Name: tiva_timer32_absmatch * * Description: * This function may be called at any time to change the timer interval - * match value of a 32-bit timer. + * match value of a 32-bit timer. This function sets the match register + * the the absolute value specified. * * Input Parameters: - * handle - The handle value returned by tiva_gptm_configure() - * match - The value to write to the timer match register + * handle - The handle value returned by tiva_gptm_configure() + * absmatch - The absolute value to write to the timer match register * * Returned Value: * None. * ****************************************************************************/ -static inline void tiva_timer32_setmatch(TIMER_HANDLE handle, uint32_t match) +static inline void tiva_timer32_absmatch(TIMER_HANDLE handle, + uint32_t absmatch) { - tiva_gptm_putreg(handle, TIVA_TIMER0_TAMATCHR, match); + tiva_gptm_putreg(handle, TIVA_TIMER_TAMATCHR_OFFSET, absmatch); } /**************************************************************************** - * Name: tiva_timer16_setmatch + * Name: tiva_timer16_absmatch * * Description: * This function may be called at any time to change the timer interval - * match value of a 16-bit timer. + * match value of a 16-bit timer. This function sets the match register + * the the absolute value specified. * * Input Parameters: - * handle - The handle value returned by tiva_gptm_configure() - * match - The value to write to the timer match register - * tmndx - Either TIMER16A or TIMER16B to select the 16-bit timer + * handle - The handle value returned by tiva_gptm_configure() + * absmatch - The value to write to the timer match register + * tmndx - Either TIMER16A or TIMER16B to select the 16-bit timer * * Returned Value: * None. * ****************************************************************************/ -static inline void tiva_timer16_setmatch(TIMER_HANDLE handle, uint16_t match, - int tmndx) +static inline void tiva_timer16_absmatch(TIMER_HANDLE handle, + uint16_t absmatch, int tmndx) { unsigned int regoffset = - tmndx ? TIVA_TIMER0_TBMATCHR : TIVA_TIMER0_TAMATCHR; + tmndx ? TIVA_TIMER_TBMATCHR_OFFSET : TIVA_TIMER_TAMATCHR_OFFSET; - tiva_gptm_putreg(handle, regoffset, match); + tiva_gptm_putreg(handle, regoffset, absmatch); } -static inline void tiva_timer16a_setmatch(TIMER_HANDLE handle, uint16_t match) +static inline void tiva_timer16a_absmatch(TIMER_HANDLE handle, uint16_t absmatch) { - tiva_gptm_putreg(handle, TIVA_TIMER0_TAMATCHR, match); + tiva_gptm_putreg(handle, TIVA_TIMER_TAMATCHR_OFFSET, absmatch); } -static inline void tiva_timer16b_setmatch(TIMER_HANDLE handle, uint16_t match) +static inline void tiva_timer16b_absmatch(TIMER_HANDLE handle, uint16_t absmatch) { - tiva_gptm_putreg(handle, TIVA_TIMER0_TBMATCHR, match); + tiva_gptm_putreg(handle, TIVA_TIMER_TBMATCHR_OFFSET, absmatch); } /**************************************************************************** + * Name: tiva_timer32_relmatch + * + * Description: + * This function may be called at any time to change the timer interval + * match value of a 32-bit timer. This function sets the match register + * to the current timer counter register value PLUS the relative value + * provided. The relative value then is some the offset to some timer + * counter value in the future. + * + * If an interrupt handler is provided, then the match interrupt will also + * be enabled. A single match interrupt will be generated; further match + * interrupts will be disabled. + * + * NOTE: Use of this function is only meaningful for a free-runnning, + * periodic timer. + * + * WARNING: For free-running timers, the relative match value should be + * sufficiently far in the future to avoid race conditions. + * + * Input Parameters: + * handle - The handle value returned by tiva_gptm_configure() + * relmatch - The value to write to the timer match register + * + * Returned Value: + * None. + * + ****************************************************************************/ + +void tiva_timer32_relmatch(TIMER_HANDLE handle, uint32_t relmatch); + +/**************************************************************************** + * Name: tiva_timer16_relmatch + * + * Description: + * This function may be called at any time to change the timer interval + * match value of a 16-bit timer. This function sets the match register + * to the current timer counter register value PLUS the relative value + * provided. The relative value then is some the offset to some timer + * counter value in the future. + * + * If an interrupt handler is provided, then the match interrupt will also + * be enabled. A single match interrupt will be generated; further match + * interrupts will be disabled. + * + * NOTE: Use of this function is only meaningful for a free-runnning, + * periodic timer. + * + * NOTE: The relmatch input is a really a 24-bit value; it is the 16-bit + * match counter match value AND the 8-bit prescaler value. From the + * callers point of view the match value is the 24-bit time to match + * driven at the timer input clock frequency. + * + * When counting down in periodic modes, the prescaler contains the + * least-significant bits of the count. When counting up, the prescaler + * holds the most-significant bits of the count. But the caller is + * protected from this complexity. + * + * WARNING: For free-running timers, the relative match value should be + * sufficiently far in the future to avoid race conditions. + * + * Input Parameters: + * handle - The handle value returned by tiva_gptm_configure() + * relmatch - The value to write to the timer match register + * tmndx - Either TIMER16A or TIMER16B to select the 16-bit timer + * + * Returned Value: + * None. + * + ****************************************************************************/ + +void tiva_timer16_relmatch(TIMER_HANDLE handle, uint32_t relmatch, int tmndx); + +#define tiva_timer16a_relmatch(h,r) tiva_timer16_relmatch(h,r,TIMER16A) +#define tiva_timer16b_relmatch(h,r) tiva_timer16_relmatch(h,r,TIMER16B) + +/**************************************************************************** * Name: tiva_gptm0_synchronize * * Description: |