Posted on November 16, 2017 at 15:19Hallo. I'm working in a STM32L433 and I'm using CubeMX tool to generate the initialization code.
I have a question regarding the comparators' Low level driver.
Although I'm using both comparator input pin (In+ and In-) connected to external port, and so I don't use the internal voltage reference, the low level driver keep the time wait for voltage scaler stabilization, but the internal voltage reference is off and the 'SCALEN' bit in 'COMP1_CSR' register is set to 0.
This is a low power application so I have should return in standby mode as quickly as I can, so I shouldn't wait this startup time if it weren't neccessary.
Am I doing something wrong or it is a kind of bug in low level driver? Is there any configuration to inform CubeMX to not add the wait cycle?
How can I bypass the issue and, eventually, how can I give feedbak about this bug (If it were).
Sorry for my english and thank you in advance.
Paolo
This is the generated code block:
void MX_COMP1_Init(void)
{
...cut...
/* Wait loop initialization and execution */
/* Note: Variable divided by 2 to compensate partially CPU processing cycles */
__IO uint32_t wait_loop_index = 0;
wait_loop_index = (LL_COMP_DELAY_VOLTAGE_SCALER_STAB_US * (SystemCoreClock / (1000000 * 2)));
while(wait_loop_index != 0)
{
wait_loop_index--;
}
LL_EXTI_DisableEvent_0_31(LL_EXTI_LINE_21);
LL_EXTI_DisableIT_0_31(LL_EXTI_LINE_21);
}
