Performance Monitor
The Performance Monitor component provides APIs to use ESP32-S2 internal performance counters to profile functions and applications.
Application Example
An example which combines performance monitor is provided in examples/system/perfmon directory.
This example initializes the performance monitor structure and execute them with printing the statistics.
High level API Reference
Header Files
API Reference
Header File
Functions
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esp_err_t xtensa_perfmon_init(int id, uint16_t select, uint16_t mask, int kernelcnt, int tracelevel)
Init Performance Monitoor.
Initialize performance monitor register with define values
- 参数
id – [in] performance counter number
select – [in] select value from PMCTRLx register
mask – [in] mask value from PMCTRLx register
kernelcnt – [in] kernelcnt value from PMCTRLx register
tracelevel – [in] tracelevel value from PMCTRLx register
- 返回
ESP_OK on success
ESP_ERR_INVALID_ARG if one of the arguments is not correct
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esp_err_t xtensa_perfmon_reset(int id)
Reset PM counter.
Reset PM counter. Writes 0 to the PMx register.
- 参数
id – [in] performance counter number
- 返回
ESP_OK on success
ESP_ERR_INVALID_ARG if id out of range
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void xtensa_perfmon_start(void)
Start PM counters.
Start all PM counters synchronously. Write 1 to the PGM register
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void xtensa_perfmon_stop(void)
Stop PM counters.
Stop all PM counters synchronously. Write 0 to the PGM register
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uint32_t xtensa_perfmon_value(int id)
Read PM counter.
Read value of defined PM counter.
- 参数
id – [in] performance counter number
- 返回
Performance counter value
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esp_err_t xtensa_perfmon_overflow(int id)
Read PM overflow state.
Read overflow value of defined PM counter.
- 参数
id – [in] performance counter number
- 返回
ESP_OK if there is no overflow (overflow = 0)
ESP_FAIL if overflow occure (overflow = 1)
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void xtensa_perfmon_dump(void)
Dump PM values.
Dump all PM register to the console.
Header File
Functions
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esp_err_t xtensa_perfmon_exec(const xtensa_perfmon_config_t *config)
Execute PM.
Execute performance counter for dedicated function with defined parameters
- 参数
config – [in] pointer to the configuration structure
- 返回
ESP_OK if no errors
ESP_ERR_INVALID_ARG if one of the required parameters not defined
ESP_FAIL - counter overflow
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void xtensa_perfmon_view_cb(void *params, uint32_t select, uint32_t mask, uint32_t value)
Dump PM results.
Callback to dump perfmon result to a FILE* stream specified in perfmon_config_t::callback_params. If callback_params is set to NULL, will print to stdout
- 参数
params – [in] used parameters passed from configuration (callback_params). This parameter expected as FILE* hanle, where data will be stored. If this parameter NULL, then data will be stored to the stdout.
select – [in] select value for current counter
mask – [in] mask value for current counter
value – [in] counter value for current counter
Structures
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struct xtensa_perfmon_config
Performance monitor configuration structure.
Structure to configure performance counter to measure dedicated function
Public Members
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int repeat_count
how much times function will be called before the calback will be repeated
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float max_deviation
Difference between min and max counter number 0..1, 0 - no difference, 1 - not used
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void *call_params
This pointer will be passed to the call_function as a parameter
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void (*call_function)(void *params)
pointer to the function that have to be called
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void (*callback)(void *params, uint32_t select, uint32_t mask, uint32_t value)
pointer to the function that will be called with result parameters
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void *callback_params
parameter that will be passed to the callback
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int tracelevel
trace level for all counters. In case of negative value, the filter will be ignored. If it’s >=0, then the perfmon will count only when interrupt level > tracelevel. It’s useful to monitor interrupts.
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uint32_t counters_size
amount of counter in the list
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const uint32_t *select_mask
list of the select/mask parameters
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int repeat_count
Type Definitions
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typedef struct xtensa_perfmon_config xtensa_perfmon_config_t
Performance monitor configuration structure.
Structure to configure performance counter to measure dedicated function