diff options
Diffstat (limited to 'os/hal/ports/NRF5/LLD/ADCv1/hal_adc_lld.c')
| -rw-r--r-- | os/hal/ports/NRF5/LLD/ADCv1/hal_adc_lld.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/os/hal/ports/NRF5/LLD/ADCv1/hal_adc_lld.c b/os/hal/ports/NRF5/LLD/ADCv1/hal_adc_lld.c new file mode 100644 index 0000000..e1d8bc6 --- /dev/null +++ b/os/hal/ports/NRF5/LLD/ADCv1/hal_adc_lld.c @@ -0,0 +1,227 @@ +/*
+ Copyright (C) 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 ADCv1/adc_lld.c
+ * @brief NRF51 ADC subsystem low level driver source.
+ *
+ * @addtogroup ADC
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_ADC || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+#define ADC_CHANNEL_MASK 0x7
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/** @brief ADC1 driver identifier.*/
+#if NRF5_ADC_USE_ADC1 || defined(__DOXYGEN__)
+ADCDriver ADCD1;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+static void adc_lld_config_next_channel(ADCDriver *adcp, uint32_t config) {
+
+ /* Default to all analog input pins disabled */
+ config &= ~ADC_CONFIG_PSEL_Msk;
+
+ if (adcp->grpp->channel_mask) {
+ /* Skip to the next channel */
+ while (((1 << adcp->current_channel) & adcp->grpp->channel_mask) == 0)
+ adcp->current_channel = (adcp->current_channel + 1) & ADC_CHANNEL_MASK;
+ config |= (((1 << adcp->current_channel) << ADC_CONFIG_PSEL_Pos) & ADC_CONFIG_PSEL_Msk);
+ }
+
+ /* Setup analog input pin select and user config values */
+ adcp->adc->CONFIG = config;
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if NRF5_ADC_USE_ADC1 || defined(__DOXYGEN__)
+/**
+ * @brief ADC interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(Vector5C) {
+
+ ADCDriver *adcp = &ADCD1;
+ NRF_ADC_Type *adc = adcp->adc;
+ bool more = true;
+
+ OSAL_IRQ_PROLOGUE();
+
+ /* Clear the ADC event */
+ adc->EVENTS_END = 0;
+
+ /* Read the sample into the buffer */
+ adcp->samples[adcp->current_index++] = adc->RESULT;
+
+ /* At the end of the buffer then we may be finished */
+ if (adcp->current_index == adcp->number_of_samples) {
+ _adc_isr_full_code(adcp);
+
+ adcp->current_index = 0;
+
+ /* We are never finished in circular mode */
+ more = adcp->grpp->circular;
+ }
+
+ if (more) {
+
+ /* Signal half completion in circular mode. */
+ if (adcp->grpp->circular &&
+ (adcp->current_index == (adcp->number_of_samples / 2))) {
+
+ _adc_isr_half_code(adcp);
+ }
+
+ /* Skip to the next channel */
+ adcp->current_channel = (adcp->current_channel + 1) & ADC_CHANNEL_MASK;
+ adc_lld_config_next_channel(adcp, adcp->adc->CONFIG);
+ adcp->adc->TASKS_START = 1;
+ } else {
+ adc_lld_stop_conversion(adcp);
+ }
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level ADC driver initialization.
+ *
+ * @notapi
+ */
+void adc_lld_init(void) {
+
+#if NRF5_ADC_USE_ADC1
+ /* Driver initialization.*/
+ adcObjectInit(&ADCD1);
+ ADCD1.adc = NRF_ADC;
+#endif
+}
+
+/**
+ * @brief Configures and activates the ADC peripheral.
+ *
+ * @param[in] adcp pointer to the @p ADCDriver object
+ *
+ * @notapi
+ */
+void adc_lld_start(ADCDriver *adcp) {
+
+ /* If in stopped state then configures and enables the ADC. */
+ if (adcp->state == ADC_STOP) {
+#if NRF5_ADC_USE_ADC1
+ if (&ADCD1 == adcp) {
+
+ adcp->adc->INTENSET = ADC_INTENSET_END_Enabled << ADC_INTENSET_END_Pos;
+ nvicEnableVector(ADC_IRQn, NRF5_ADC_IRQ_PRIORITY);
+ }
+#endif /* NRF5_ADC_USE_ADC1 */
+ }
+}
+
+/**
+ * @brief Deactivates the ADC peripheral.
+ *
+ * @param[in] adcp pointer to the @p ADCDriver object
+ *
+ * @notapi
+ */
+void adc_lld_stop(ADCDriver *adcp) {
+
+ /* If in ready state then disables the ADC clock and analog part.*/
+ if (adcp->state == ADC_READY) {
+
+#if NRF5_ADC_USE_ADC1
+ if (&ADCD1 == adcp) {
+
+ nvicDisableVector(ADC_IRQn);
+ adcp->adc->INTENCLR = ADC_INTENCLR_END_Clear << ADC_INTENCLR_END_Pos;
+ adc_lld_stop_conversion(adcp);
+ }
+#endif
+ }
+}
+
+/**
+ * @brief Starts an ADC conversion.
+ *
+ * @param[in] adcp pointer to the @p ADCDriver object
+ *
+ * @notapi
+ */
+void adc_lld_start_conversion(ADCDriver *adcp) {
+
+ NRF_ADC_Type *adc = adcp->adc;
+
+ adcp->number_of_samples = adcp->depth * adcp->grpp->num_channels;
+ adcp->current_index = 0;
+
+ /* At least one sample must be configured */
+ osalDbgAssert(adcp->number_of_samples, "must configure at least one sample");
+
+ /* Skip to the next channel */
+ adcp->current_channel = 0;
+ adc_lld_config_next_channel(adcp, adcp->grpp->cfg);
+
+ /* Enable and start the conversion */
+ adc->ENABLE = ADC_ENABLE_ENABLE_Enabled << ADC_ENABLE_ENABLE_Pos;
+ adc->TASKS_START = 1;
+}
+
+/**
+ * @brief Stops an ongoing conversion.
+ *
+ * @param[in] adcp pointer to the @p ADCDriver object
+ *
+ * @notapi
+ */
+void adc_lld_stop_conversion(ADCDriver *adcp) {
+
+ NRF_ADC_Type *adc = adcp->adc;
+
+ adc->TASKS_STOP = 1;
+ adc->ENABLE = ADC_ENABLE_ENABLE_Disabled << ADC_ENABLE_ENABLE_Pos;
+}
+
+#endif /* HAL_USE_ADC */
+
+/** @} */
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