The problem of delay function being optimized when debugging stm8 microcontroller with IAR-EEWORLD

Collect

When IAR optimization level is set to the highest, the compiler will directly optimize the following delay functions when they are called, and the delay effect cannot be achieved.

void delay_n_ms(u32 time)

{

u32 m = 0;

u16 n = 0;

for(;m < time;m++)

{

for(n = 0;n < 2720;n++) // 16Mhz

{

;

}

The problem is solved by adding the volatile keyword before the function's variable.

void delay_n_ms(u32 time)

{

volatile u32 m = 0;

volatile u16 n = 0;

for(;m < time;m++)

{

for(n = 0;n < 2720;n++) // 16Mhz

{

;

}

Reference address：The problem of delay function being optimized when debugging stm8 microcontroller with IAR

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