/**
* @brief Starts an ADC conversion.
* @details Starts a conversion operation, there are two kind of conversion
* modes:
* - <b>LINEAR</b>, this mode is activated when the @p callback
* parameter is set to @p NULL, in this mode the buffer is filled
* once and then the conversion stops automatically.
* - <b>CIRCULAR</b>, when a callback function is defined the
* conversion never stops and the buffer is filled circularly.
* During the conversion the callback function is invoked when
* the buffer is 50% filled and when the buffer is 100% filled,
* this way is possible to process the conversion stream in real
* time. This kind of conversion can only be stopped by explicitly
* invoking @p adcStopConversion().
* .
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] grpp pointer to a @p ADCConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
* @param[in] callback pointer to the conversion callback function
* @return The operation status.
* @retval FALSE the conversion has been started.
* @retval TRUE the driver is busy, conversion not started.
*/
bool_t adcStartConversion(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth,
adccallback_t callback) {
chDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
((depth == 1) || ((depth & 1) == 0)),
"adcStartConversion");
chSysLock();
chDbgAssert((adcp->ad_state == ADC_READY) ||
(adcp->ad_state == ADC_RUNNING) ||
(adcp->ad_state == ADC_COMPLETE),
"adcStartConversion(), #1",
"invalid state");
if (adcp->ad_state == ADC_RUNNING) {
chSysUnlock();
return TRUE;
}
adcp->ad_callback = callback;
adcp->ad_samples = samples;
adcp->ad_depth = depth;
adcp->ad_grpp = grpp;
adc_lld_start_conversion(adcp);
adcp->ad_state = ADC_RUNNING;
chSysUnlock();
return FALSE;
}
/**
* @brief Starts an ADC conversion.
* @details Starts an asynchronous conversion operation.
* @post The callbacks associated to the conversion group will be invoked
* on buffer fill and error events.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] grpp pointer to a @p ADCConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
*
* @iclass
*/
void adcStartConversionI(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth) {
osalDbgCheckClassI();
osalDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
(depth > 0U) && ((depth == 1U) || ((depth & 1U) == 0U)));
osalDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_ERROR),
"not ready");
adcp->samples = samples;
adcp->depth = depth;
adcp->grpp = grpp;
adcp->state = ADC_ACTIVE;
adc_lld_start_conversion(adcp);
}
/**
* @brief Starts an ADC conversion.
* @details Starts an asynchronous conversion operation.
* @post The callbacks associated to the conversion group will be invoked
* on buffer fill and error events.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] adcp pointer to the @p ADCDriver object
* @param[in] grpp pointer to a @p ADCConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
*
* @iclass
*/
void adcStartConversionI(ADCDriver *adcp,
const ADCConversionGroup *grpp,
adcsample_t *samples,
size_t depth) {
chDbgCheckClassI();
chDbgCheck((adcp != NULL) && (grpp != NULL) && (samples != NULL) &&
((depth == 1) || ((depth & 1) == 0)),
"adcStartConversionI");
chDbgAssert((adcp->state == ADC_READY) ||
(adcp->state == ADC_COMPLETE) ||
(adcp->state == ADC_ERROR),
"adcStartConversionI(), #1", "not ready");
adcp->samples = samples;
adcp->depth = depth;
adcp->grpp = grpp;
adcp->state = ADC_ACTIVE;
adc_lld_start_conversion(adcp);
}
