Class DataAPI
Public Functions
Type | Name |
---|---|
float32_t | convert (channel_t channel, uint16_t raw_value) Use this function to convert values obtained using matching data.get*RawValues() function to relevant unit for the data: Volts, Amperes, or Degree Celcius. |
float32_t | convert (uint8_t adc_num, uint8_t pin_num, uint16_t raw_value) Use this function to convert values obtained using matching data.get*RawValues() function to relevant unit for the data: Volts, Amperes, or Degree Celcius. |
int8_t | enableAcquisition (uint8_t adc_num, uint8_t pin_num) This function is used to enable acquisition on a Spin PIN with a given ADC. |
int8_t | enableShieldChannel (uint8_t adc_num, channel_t channel_name) This function is used to enable a channel on a given ADC using its name on a shield, rather than the ADC channel number. This function requires the presence of an "adc-channels" node in the shield device-tree. |
void | enableTwistDefaultChannels () This function is used to enable acquisition of all voltage/current channels on the Twist shield. Channels are attributed as follows: ADC1: - I1_LOW ADC2: - I2_LOW. |
DispatchMethod_t | getDispatchMethod () Gets the dispatch method of the module. |
float32_t | getLatest (channel_t channel, uint8_t * dataValid=nullptr) This function returns the latest acquired measure expressed in the relevant unit for the channel: Volts, Amperes, or Degree Celcius. |
float32_t | getLatest (uint8_t adc_num, uint8_t pin_num, uint8_t * dataValid=nullptr) This function returns the latest acquired measure expressed in the relevant unit for the channel: Volts, Amperes, or Degree Celcius. |
uint16_t * | getRawValues (channel_t channel, uint32_t & number_of_values_acquired) Function to access the acquired data for specified channel. This function provides a buffer in which all data that have been acquired since last call are stored. The count of these values is returned as an output parameter: the user has to define a variable and pass it as the parameter of the function. The variable will be updated with the number of values that are available in the buffer. |
uint16_t * | getRawValues (uint8_t adc_num, uint8_t pin_num, uint32_t & number_of_values_acquired) Function to access the acquired data for specified pin. This function provides a buffer in which all data that have been acquired since last call are stored. The count of these values is returned as an output parameter: the user has to define a variable and pass it as the parameter of the function. The variable will be updated with the number of values that are available in the buffer. |
float32_t | peek (channel_t channel) Function to access the latest value available from the channel, expressed in the relevant unit for the data: Volts, Amperes, or Degree Celcius. This function will not touch anything in the buffer, and thus can be called safely at any time after the module has been started. |
float32_t | peek (uint8_t adc_num, uint8_t pin_num) Function to access the latest value available from a pin, expressed in the relevant unit for the data: Volts, Amperes, or Degree Celcius. This function will not touch anything in the buffer, and thus can be called safely at any time after the module has been started. |
int8_t | retrieveParametersFromMemory (channel_t channel) Use this function to read the gain and offset parameters of the board to is non-volatile memory. |
int8_t | retrieveParametersFromMemory (uint8_t adc_num, uint8_t pin_num) Retreived previously configured conversion parameters from NVS. |
conversion_type_t | retrieveStoredConversionType (channel_t channel) Use this function to get the current conversion type for the chosen channel. |
conversion_type_t | retrieveStoredConversionType (uint8_t adc_num, uint8_t pin_num) Use this function to get the current conversion type for the chosen channel. |
float32_t | retrieveStoredParameterValue (channel_t channel, parameter_t parameter_name) Use this function to get the current conversion parameteres for the chosen channel . |
float32_t | retrieveStoredParameterValue (uint8_t adc_num, uint8_t pin_num, parameter_t parameter_name) Use this function to get the current conversion parameteres for the chosen channel . |
void | setDispatchMethod (DispatchMethod_t dispatch_method) Sets the dispatch method of the module. |
void | setParameters (channel_t channel, float32_t gain, float32_t offset) Use this function to tweak the conversion values for the channel if default values are not accurate enough. |
void | setParameters (uint8_t adc_num, uint8_t pin_num, float32_t gain, float32_t offset) Use this function to tweak the conversion values for the channel if default values are not accurate enough. |
void | setRepetitionsBetweenDispatches (uint32_t repetition) Indicates the repetition count between two external dispatches when it is handled externally by the Scheduling module. This value is used to calibrate buffers sizes. |
void | setTwistChannelsUserCalibrationFactors () Retrieve stored parameters from Flash memory and configure ADC parameters. |
int8_t | start () This functions manually starts the acquisition chain. |
bool | started () Checks if the module is already started. |
int8_t | storeParametersInMemory (channel_t channel) Use this function to write the gain and offset parameters of the board to is non-volatile memory. |
int8_t | storeParametersInMemory (uint8_t adc_num, uint8_t pin_num) Store the currently configured conversion parameters of a given channel in NVS. |
void | triggerAcquisition (uint8_t adc_num) Triggers an acquisition on a given ADC. Each channel configured on this ADC will be acquired one after the other until all configured channels have been acquired. |
Public Functions Documentation
function convert [1/2]
Use this function to convert values obtained using matching data.get*RawValues() function to relevant unit for the data: Volts, Amperes, or Degree Celcius.
Note:
This function can't be called before the channel is enabled.
Parameters:
channel
Name of the shield channel from which the value originatesraw_value
Raw value obtained from which the value originates
Returns:
Converted value in the relevant unit. Returns -5000 if the channel is not active.
function convert [2/2]
Use this function to convert values obtained using matching data.get*RawValues() function to relevant unit for the data: Volts, Amperes, or Degree Celcius.
Note:
This function can't be called before the pin is enabled.
Parameters:
adc_num
Number of the ADC from which the value originates.pin_num
Number of the pin from which to obtain values.raw_value
Raw value obtained from the channel buffer.
Returns:
Converted value in the relevant unit. If there is an error, returns -5000.
function enableAcquisition
This function is used to enable acquisition on a Spin PIN with a given ADC.
Note:
Not any pin can be used for acquisiton: the pin must be linked to a channel of the given ADC. Refer to Spin pinout image for PIN/ADC relations.
Note:
This function must be called before ADC is started.
Parameters:
adc_number
Number of the ADC on which acquisition is to be done.pin_num
Number of the Spin pin to acquire.
Returns:
0 if acquisition was correctly enabled, -1 if there was an error.
function enableShieldChannel
This function is used to enable a channel on a given ADC using its name on a shield, rather than the ADC channel number. This function requires the presence of an "adc-channels" node in the shield device-tree.
Note:
This function must be called before ADC is started.
Parameters:
adc_number
Number of the ADC on which channel is to be enabled.channel_name
Name of the channel using enumeration channel_t.
Returns:
0 if channel was correctly enabled, -1 if there was an error.
function enableTwistDefaultChannels
This function is used to enable acquisition of all voltage/current channels on the Twist shield. Channels are attributed as follows: ADC1: - I1_LOW ADC2: - I2_LOW.
- V1_LOW - V2_LOW
- V_HIGH - I_HIGH
Note:
This function will configure ADC 1 and 2 to be automatically triggered by the HRTIM, so the board must be configured as a power converted to enable HRTIM events. All other ADCs remain software triggered, thus will only be acquired when triggerAcquisition() is called.
Note:
This function must be called before ADC is started.
function getDispatchMethod
Gets the dispatch method of the module.
Note:
End-user should not worry about this function, which is used internally by the Scheduling module.
Returns:
Dispatch method indicatinng when the dispatch is done.
function getLatest [1/2]
This function returns the latest acquired measure expressed in the relevant unit for the channel: Volts, Amperes, or Degree Celcius.
Note:
This function can't be called before the channel is enabled and the DataAPI module is started, either explicitly or by starting the Uninterruptible task.
Note:
When using this functions, you loose the ability to access raw values using data.get*RawValues() function for the matching channel, as data.get*() function clears the buffer on each call.
Parameters:
channel
Name of the shield channel from which to obtain value.dataValid
Pointer to an uint8_t variable. This parameter is facultative. If this parameter is provided, it will be updated to indicate information about data. Possible values for this parameter will be:- DATA_IS_OK if returned data is a newly acquired data,
- DATA_IS_OLD if returned data has already been provided before (no new data available since latest time this function was called),
- DATA_IS_MISSING if returned data is NO_VALUE.
Returns:
Latest acquired measure for the channel. If no value was acquired in this channel yet, return value is NO_VALUE.
function getLatest [2/2]
This function returns the latest acquired measure expressed in the relevant unit for the channel: Volts, Amperes, or Degree Celcius.
Note:
This function can't be called before the pin is enabled. The DataAPI module must have been started, either explicitly or by starting the Uninterruptible task.
Note:
When using this functions, you loose the ability to access raw values using data.get*RawValues() function for the matching channel, as data.get*() function clears the buffer on each call.
Parameters:
adc_num
Number of the ADC from which to obtain value.pin_num
Number of the pin from which to obtain values.dataValid
Pointer to an uint8_t variable. This parameter is facultative. If this parameter is provided, it will be updated to indicate information about data. Possible values for this parameter will be:- DATA_IS_OK if returned data is a newly acquired data,
- DATA_IS_OLD if returned data has already been provided before (no new data available since latest time this function was called),
- DATA_IS_MISSING if returned data is NO_VALUE.
Returns:
Latest acquired measure for the channel. If no value was acquired in this channel yet, return value is NO_VALUE.
function getRawValues [1/2]
Function to access the acquired data for specified channel. This function provides a buffer in which all data that have been acquired since last call are stored. The count of these values is returned as an output parameter: the user has to define a variable and pass it as the parameter of the function. The variable will be updated with the number of values that are available in the buffer.
Note:
This function can't be called before the channel is enabled and the DataAPI module is started, either explicitly or by starting the Uninterruptible task.
Note:
When calling this function, it invalidates the buffer returned by a previous call to the same function. However, different channels buffers are independent from each other.
Note:
When using this functions, the user is responsible for data conversion. Use matching data.convert*() function for this purpose.
Note:
When using this function, DO NOT use the function to get the latest converted value for the same channel as this function will clear the buffer and disregard all values but the latest.
Parameters:
channel
Name of the shield channel from which to obtain values.number_of_values_acquired
Pass an uint32_t variable. This variable will be updated with the number of values that are present in the returned buffer.
Returns:
Pointer to a buffer in which the acquired values are stored. If number_of_values_acquired is 0, do not try to access the buffer as it may be nullptr.
function getRawValues [2/2]
Function to access the acquired data for specified pin. This function provides a buffer in which all data that have been acquired since last call are stored. The count of these values is returned as an output parameter: the user has to define a variable and pass it as the parameter of the function. The variable will be updated with the number of values that are available in the buffer.
uint16_t * DataAPI::getRawValues (
uint8_t adc_num,
uint8_t pin_num,
uint32_t & number_of_values_acquired
)
Note:
This function can't be called before the pin is enabled. The DataAPI module must have been started, either explicitly or by starting the Uninterruptible task.
Note:
When calling this function, it invalidates the buffer returned by a previous call to the same function. However, different channels buffers are independent from each other.
Note:
When using this functions, the user is responsible for data conversion. Use matching data.convert*() function for this purpose.
Note:
When using this function, DO NOT use the function to get the latest converted value for the same channel as this function will clear the buffer and disregard all values but the latest.
Parameters:
adc_num
Number of the ADC from which to obtain values.pin_num
Number of the pin from which to obtain values.number_of_values_acquired
Pass an uint32_t variable. This variable will be updated with the number of values that are present in the returned buffer.
Returns:
Pointer to a buffer in which the acquired values are stored. If number_of_values_acquired is 0, do not try to access the buffer as it may be nullptr.
function peek [1/2]
Function to access the latest value available from the channel, expressed in the relevant unit for the data: Volts, Amperes, or Degree Celcius. This function will not touch anything in the buffer, and thus can be called safely at any time after the module has been started.
Note:
This function can't be called before the channel is enabled and the DataAPI module is started, either explicitly or by starting the Uninterruptible task.
Parameters:
channel
Name of the shield channel from which to obtain value.
Returns:
Latest available value available from the given channel. If there was no value acquired in this channel yet, return value is NO_VALUE.
function peek [2/2]
Function to access the latest value available from a pin, expressed in the relevant unit for the data: Volts, Amperes, or Degree Celcius. This function will not touch anything in the buffer, and thus can be called safely at any time after the module has been started.
Note:
This function can't be called before the pin is enabled. The DataAPI module must have been started, either explicitly or by starting the Uninterruptible task.
Parameters:
adc_num
Number of the ADC from which to obtain value.pin_num
Number of the pin from which to obtain values.
Returns:
Latest available value available from the given channel. If there was no value acquired in this channel yet, return value is NO_VALUE.
function retrieveParametersFromMemory [1/2]
Use this function to read the gain and offset parameters of the board to is non-volatile memory.
Parameters:
channel
Name of the shield channel to save the values.
function retrieveParametersFromMemory [2/2]
Retreived previously configured conversion parameters from NVS.
Parameters:
adc_num
ADC numberpin_num
SPIN pin number
Returns:
0 if parameters were correcly retreived, negative value if there was an error: -1: NVS is empty -2: NVS contains data, but their version doesn't match current version -3: NVS data is corrupted -4: NVS contains data, but not for the requested channel -5000: Channel not found.
function retrieveStoredConversionType [1/2]
Use this function to get the current conversion type for the chosen channel.
Note:
This function can't be called before the channel is enabled.
Parameters:
channel
Name of the shield channel to get a conversion parameter.
function retrieveStoredConversionType [2/2]
Use this function to get the current conversion type for the chosen channel.
Note:
This function can't be called before the channel is enabled.
Parameters:
channel
Name of the shield channel to get a conversion parameter.
Returns:
Returns the type of convertion of the given pin. Returns -5 if the channel is not active.
function retrieveStoredParameterValue [1/2]
Use this function to get the current conversion parameteres for the chosen channel .
Note:
This function can't be called before the channel is enabled.
Parameters:
channel
Name of the shield channel to get a conversion parameter.parameter_name
Paramater to be retreived:gain
oroffset
.
function retrieveStoredParameterValue [2/2]
Use this function to get the current conversion parameteres for the chosen channel .
float32_t DataAPI::retrieveStoredParameterValue (
uint8_t adc_num,
uint8_t pin_num,
parameter_t parameter_name
)
Note:
This function can't be called before the channel is enabled.
Parameters:
channel
Name of the shield channel to get a conversion parameter.parameter_name
Paramater to be retreived:gain
oroffset
.
Returns:
Returns the value of the parameter. Returns -5000 if the channel is not active.
function setDispatchMethod
Sets the dispatch method of the module.
Note:
End-user should not worry about this function, which is used internally by the Scheduling module.
Parameters:
dispatch_method
Indicates when the dispatch should be done (default value: DispatchMethod_t::on_dma_interrupt)
function setParameters [1/2]
Use this function to tweak the conversion values for the channel if default values are not accurate enough.
Note:
This function can't be called before the channel is enabled. The DataAPI must not have been started, neither explicitly nor by starting the Uninterruptible task.
Parameters:
channel
Name of the shield channel to set conversion values.gain
Gain to be applied (multiplied) to the channel raw value.offset
Offset to be applied (added) to the channel value after gain has been applied.
function setParameters [2/2]
Use this function to tweak the conversion values for the channel if default values are not accurate enough.
Note:
This function can't be called before the pin is enabled. The DataAPI module must not have been started, neither explicitly nor by starting the Uninterruptible task.
Parameters:
adc_num
Number of the ADC to set conversion values.pin_num
Number of the pin from which to obtain values.gain
Gain to be applied (multiplied) to the channel raw value.offset
Offset to be applied (added) to the channel value after gain has been applied.
function setRepetitionsBetweenDispatches
Indicates the repetition count between two external dispatches when it is handled externally by the Scheduling module. This value is used to calibrate buffers sizes.
Note:
End-user should not worry about this function, which is used internally by the Scheduling module.
Parameters:
repetition
Number of repetitions between two calls of dispatch. Used to calibrate buffers sizes.
function setTwistChannelsUserCalibrationFactors
Retrieve stored parameters from Flash memory and configure ADC parameters.
Note:
This function requires Console to interact with the user. You must first call console_init() before calling this function.
Note:
This function can't be called before all Twist channels have been enabled (you can use enableTwistDefaultChannels() for that purpose). The DataAPI must not have been started, neither explicitly nor by starting the Uninterruptible task.
function start
This functions manually starts the acquisition chain.
Note:
If your code uses an uninterruptible task, you do not need to start Data Acquisition manually, it will automatically be started at the same time as the task as their internal behavior are intrinsically linked. If for some reason you have an uninterruptible task in your code, but do not want the Scheduling module to be in charge of Data Acquisition, you need to indicate it when starting the uninterruptible task. In that case, Data Acquisition must be manually started using this function. Note that in taht case, dispatch will use DMA interrupts which consumes a non-negligible amount of processor time and it is not advised.
Note:
Data Acquisition must be started only after ADC module configuration has been fully carried out. No ADC configuration change is allowed after module has been started. If you're using the Twist shield and are not sure how to initialize ADCs, you can use data.enableTwistDefaultChannels() for that purpose.
Note:
Data Acquisition must be started before accessing any data.get*() or data.peek*() function. Other Data Acquisition functions are safe to use before starting the module.
Returns:
0 if everything went well, -1 if there was an error. Error is triggered when dispatch method is set to be external, but the repetition value has not provided. Another source of error is trying to start Data Acquisition after it has already been started.
function started
Checks if the module is already started.
Returns:
true is the module has been started, false otherwise.
function storeParametersInMemory [1/2]
Use this function to write the gain and offset parameters of the board to is non-volatile memory.
Note:
This function should be called after updating the parameters using setParameters.
Parameters:
channel
Name of the shield channel to save the values.
function storeParametersInMemory [2/2]
Store the currently configured conversion parameters of a given channel in NVS.
Parameters:
adc_num
ADC numberpin_num
SPIN pin number
Returns:
0 if parameters were correcly stored, negative value if there was an error: -1: There was an error, -5000: Channel not found.
function triggerAcquisition
Triggers an acquisition on a given ADC. Each channel configured on this ADC will be acquired one after the other until all configured channels have been acquired.
Note:
This function can't be called before the at least one channel is enabled on the ADC and the DataAPI module is started, either explicitly or by starting the Uninterruptible task.
Parameters:
adc_num
Number of the ADC on which to acquire channels.
The documentation for this class was generated from the following file docs/core/zephyr/modules/owntech_data_api/zephyr/public_api/DataAPI.h