Description
nvs not good work,when i use simplefoc,this is a issue：
void _driverSyncLowSide(void* driver_params, void* cs_params){
mcpwm_dev_t* mcpwm_dev = ((ESP32MCPWMDriverParams*)driver_params)->mcpwm_dev;
mcpwm_unit_t mcpwm_unit = ((ESP32MCPWMDriverParams*)driver_params)->mcpwm_unit;
mcpwm_dev->int_ena.timer0_tep_int_ena = true;//A PWM timer 0 TEP event will trigger this interrupt
// mcpwm_dev->int_ena.timer0_tep_int_ena = true;//A PWM timer 0 TEZ event will trigger this interrupt
if(mcpwm_unit == MCPWM_UNIT_0)
{
mcpwm_isr_register(mcpwm_unit, mcpwm0_isr_handler, NULL, ESP_INTR_FLAG_IRAM, NULL); //Set ISR Handler
}
else
mcpwm_isr_register(mcpwm_unit, mcpwm1_isr_handler, NULL, ESP_INTR_FLAG_IRAM, NULL); //Set ISR Handler
}
Why does ESP_INTR_FLAG_IRAM affect NVS?
IRAM Interrupts Disable Flash Access:
If the ESP32 interrupt service routine (ISR) is placed in IRAM (using ESP_INTR_FLAG_IRAM), the CPU cannot access Flash during the execution of the ISR (because IRAM code must be executed without delay).
NVS operations (such as nvs_get_* and nvs_set_*) require Flash access. If an IRAM ISR is running, NVS operations may fail or cause a deadlock.
NVS Depends on Flash Operations:
NVS relies on SPI Flash at the lower level. Flash access may be blocked during IRAM ISR execution, leading to NVS read/write failures.
Interrupt Priority Issues:
If the MCPWM interrupt has a higher priority and is triggered frequently, it may prevent NVS operations from completing in a timely manner.