diff options
Diffstat (limited to 'os/hal/ports/NRF5/LLD/TIMERv1/hal_gpt_lld.c')
| -rw-r--r-- | os/hal/ports/NRF5/LLD/TIMERv1/hal_gpt_lld.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/os/hal/ports/NRF5/LLD/TIMERv1/hal_gpt_lld.c b/os/hal/ports/NRF5/LLD/TIMERv1/hal_gpt_lld.c new file mode 100644 index 0000000..aaff432 --- /dev/null +++ b/os/hal/ports/NRF5/LLD/TIMERv1/hal_gpt_lld.c @@ -0,0 +1,361 @@ +/*
+ ChibiOS - 2015 Stephen Caudle
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @file TIMERv1/hal_gpt_lld.c
+ * @brief NRF5 GPT subsystem low level driver source.
+ *
+ * @addtogroup GPT
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_GPT || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+#define NRF5_TIMER_PRESCALER_NUM 10
+#define NRF5_TIMER_COMPARE_NUM 4
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/**
+ * @brief GPTD1 driver identifier.
+ * @note The driver GPTD1 allocates the complex timer TIM1 when enabled.
+ */
+#if NRF5_GPT_USE_TIMER0 || defined(__DOXYGEN__)
+GPTDriver GPTD1;
+#endif
+
+/**
+ * @brief GPTD2 driver identifier.
+ * @note The driver GPTD2 allocates the timer TIM2 when enabled.
+ */
+#if NRF5_GPT_USE_TIMER1 || defined(__DOXYGEN__)
+GPTDriver GPTD2;
+#endif
+
+/**
+ * @brief GPTD3 driver identifier.
+ * @note The driver GPTD3 allocates the timer TIM3 when enabled.
+ */
+#if NRF5_GPT_USE_TIMER2 || defined(__DOXYGEN__)
+GPTDriver GPTD3;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+static uint8_t prescaler(uint16_t freq)
+{
+ uint8_t i;
+ static const gptfreq_t frequencies[] = {
+ NRF5_GPT_FREQ_16MHZ,
+ NRF5_GPT_FREQ_8MHZ,
+ NRF5_GPT_FREQ_4MHZ,
+ NRF5_GPT_FREQ_2MHZ,
+ NRF5_GPT_FREQ_1MHZ,
+ NRF5_GPT_FREQ_500KHZ,
+ NRF5_GPT_FREQ_250KHZ,
+ NRF5_GPT_FREQ_125KHZ,
+ NRF5_GPT_FREQ_62500HZ,
+ NRF5_GPT_FREQ_31250HZ,
+ };
+
+ for (i = 0; i < NRF5_TIMER_PRESCALER_NUM; i++)
+ if (freq == frequencies[i])
+ return i;
+
+ osalDbgAssert(FALSE, "invalid timer frequency");
+
+ return 0;
+}
+
+/**
+ * @brief Shared IRQ handler.
+ *
+ * @param[in] gptp pointer to a @p GPTDriver object
+ */
+static void gpt_lld_serve_interrupt(GPTDriver *gptp) {
+
+ gptp->tim->EVENTS_COMPARE[gptp->cc_int] = 0;
+#if CORTEX_MODEL >= 4
+ (void)gptp->tim->EVENTS_COMPARE[gptp->cc_int];
+#endif
+ if (gptp->state == GPT_ONESHOT)
+ gptp->state = GPT_READY; /* Back in GPT_READY state. */
+ gptp->config->callback(gptp);
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if NRF5_GPT_USE_TIMER0
+/**
+ * @brief TIMER0 interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(Vector60) {
+
+ OSAL_IRQ_PROLOGUE();
+
+ gpt_lld_serve_interrupt(&GPTD1);
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif /* NRF5_GPT_USE_TIMER0 */
+
+#if NRF5_GPT_USE_TIMER1
+/**
+ * @brief TIMER1 interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(Vector64) {
+
+ OSAL_IRQ_PROLOGUE();
+
+ gpt_lld_serve_interrupt(&GPTD2);
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif /* NRF5_GPT_USE_TIMER1 */
+
+#if NRF5_GPT_USE_TIMER2
+/**
+ * @brief TIMER2 interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(Vector68) {
+
+ OSAL_IRQ_PROLOGUE();
+
+ gpt_lld_serve_interrupt(&GPTD3);
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif /* NRF5_GPT_USE_TIMER2 */
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level GPT driver initialization.
+ *
+ * @notapi
+ */
+void gpt_lld_init(void) {
+
+#if NRF5_GPT_USE_TIMER0
+ /* Driver initialization.*/
+ GPTD1.tim = NRF_TIMER0;
+ gptObjectInit(&GPTD1);
+#endif
+
+#if NRF5_GPT_USE_TIMER1
+ /* Driver initialization.*/
+ GPTD2.tim = NRF_TIMER1;
+ gptObjectInit(&GPTD2);
+#endif
+
+#if NRF5_GPT_USE_TIMER2
+ /* Driver initialization.*/
+ GPTD3.tim = NRF_TIMER2;
+ gptObjectInit(&GPTD3);
+#endif
+}
+
+/**
+ * @brief Configures and activates the GPT peripheral.
+ *
+ * @param[in] gptp pointer to the @p GPTDriver object
+ *
+ * @notapi
+ */
+void gpt_lld_start(GPTDriver *gptp) {
+
+ NRF_TIMER_Type *tim = gptp->tim;
+
+ if (gptp->state == GPT_STOP) {
+ osalDbgAssert(gptp->cc_int < NRF5_TIMER_COMPARE_NUM,
+ "invalid capture/compare index");
+
+ tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
+#if NRF5_GPT_USE_TIMER0
+ if (&GPTD1 == gptp)
+ nvicEnableVector(TIMER0_IRQn, NRF5_GPT_TIMER0_IRQ_PRIORITY);
+#endif
+#if NRF5_GPT_USE_TIMER1
+ if (&GPTD2 == gptp)
+ nvicEnableVector(TIMER1_IRQn, NRF5_GPT_TIMER1_IRQ_PRIORITY);
+#endif
+#if NRF5_GPT_USE_TIMER2
+ if (&GPTD3 == gptp)
+ nvicEnableVector(TIMER2_IRQn, NRF5_GPT_TIMER2_IRQ_PRIORITY);
+#endif
+ }
+
+ /* Prescaler value calculation.*/
+ tim->PRESCALER = prescaler(gptp->config->frequency);
+
+ /* Timer configuration.*/
+ tim->MODE = TIMER_MODE_MODE_Timer << TIMER_MODE_MODE_Pos;
+
+ switch (gptp->config->resolution) {
+
+ case 8:
+ tim->BITMODE = TIMER_BITMODE_BITMODE_08Bit << TIMER_BITMODE_BITMODE_Pos;
+ break;
+
+ case 16:
+ tim->BITMODE = TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos;
+ break;
+
+#if NRF5_GPT_USE_TIMER0
+ case 24:
+ tim->BITMODE = TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos;
+ break;
+
+ case 32:
+ tim->BITMODE = TIMER_BITMODE_BITMODE_32Bit << TIMER_BITMODE_BITMODE_Pos;
+ break;
+#endif
+
+ default:
+ osalDbgAssert(FALSE, "invalid timer resolution");
+ break;
+ };
+}
+
+/**
+ * @brief Deactivates the GPT peripheral.
+ *
+ * @param[in] gptp pointer to the @p GPTDriver object
+ *
+ * @notapi
+ */
+void gpt_lld_stop(GPTDriver *gptp) {
+
+ if (gptp->state == GPT_READY) {
+ gptp->tim->TASKS_SHUTDOWN = 1;
+
+#if NRF5_GPT_USE_TIMER0
+ if (&GPTD1 == gptp)
+ nvicDisableVector(TIMER0_IRQn);
+#endif
+#if NRF5_GPT_USE_TIMER1
+ if (&GPTD2 == gptp)
+ nvicDisableVector(TIMER1_IRQn);
+#endif
+#if NRF5_GPT_USE_TIMER2
+ if (&GPTD3 == gptp)
+ nvicDisableVector(TIMER2_IRQn);
+#endif
+ gptp->tim->INTENCLR = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
+ }
+}
+
+/**
+ * @brief Starts the timer in continuous mode.
+ *
+ * @param[in] gptp pointer to the @p GPTDriver object
+ * @param[in] interval period in ticks
+ *
+ * @notapi
+ */
+void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t interval) {
+
+ NRF_TIMER_Type *tim = gptp->tim;
+
+ tim->TASKS_CLEAR = 1;
+ tim->CC[gptp->cc_int] = (uint32_t)(interval - 1); /* Time constant. */
+ if (gptp->state == GPT_ONESHOT)
+ gptp->tim->SHORTS = TIMER_SHORTS_COMPARE0_STOP_Msk << gptp->cc_int;
+ else if (gptp->state == GPT_CONTINUOUS)
+ gptp->tim->SHORTS = TIMER_SHORTS_COMPARE0_CLEAR_Msk << gptp->cc_int;
+ tim->TASKS_START = 1;
+}
+
+/**
+ * @brief Stops the timer.
+ *
+ * @param[in] gptp pointer to the @p GPTDriver object
+ *
+ * @notapi
+ */
+void gpt_lld_stop_timer(GPTDriver *gptp) {
+
+ gptp->tim->TASKS_STOP = 1;
+}
+
+/**
+ * @brief Starts the timer in one shot mode and waits for completion.
+ * @details This function specifically polls the timer waiting for completion
+ * in order to not have extra delays caused by interrupt servicing,
+ * this function is only recommended for short delays.
+ *
+ * @param[in] gptp pointer to the @p GPTDriver object
+ * @param[in] interval time interval in ticks
+ *
+ * @notapi
+ */
+void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval) {
+
+ NRF_TIMER_Type *tim = gptp->tim;
+
+ tim->INTENCLR = (1UL << gptp->cc_int) << TIMER_INTENSET_COMPARE0_Pos;
+ tim->TASKS_CLEAR = 1;
+ tim->CC[gptp->cc_int] = (uint32_t)(interval - 1); /* Time constant. */
+ tim->TASKS_START = 1;
+ while (!(tim->INTENSET & (TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int)))
+ ;
+ tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
+}
+
+/**
+ * @brief Returns the counter value of GPT peripheral.
+ * @pre The GPT unit must be running in continuous mode.
+ * @note The nature of the counter is not defined, it may count upward
+ * or downward, it could be continuously running or not.
+ *
+ * @param[in] gptp pointer to a @p GPTDriver object
+ * @return The current counter value.
+ *
+ * @notapi
+ */
+gptcnt_t gpt_lld_get_counter(GPTDriver *gptp) {
+
+ gptp->tim->TASKS_CAPTURE[gptp->cc_get] = 1;
+ return gptp->tim->CC[gptp->cc_get];
+}
+
+#endif /* HAL_USE_GPT */
+
+/** @} */
|