1. Before using LED, you need to initialize the IO port
2. When using external interrupts, you need to initialize the IO port, configure the trigger edge, and then process it in the interrupt function
Note: When using maskable interrupts, you need to add rim();
3. When using beep, you need to initialize the IO port, calibrate the 128K clock, and enable the clock.
Note: When using Beep, you need to configure the option bytes
The option bytes are configured using iar:
FLASH_Unlock(FLASH_MEMTYPE_DATA);
FLASH_ProgramOptionByte(0x4803, 0x00);
FLASH_Lock(FLASH_MEMTYPE_DATA);
programming
4. Regarding the 3s timing of the awu wake-up unit
Set the time base unit to 1s, and then add 3 halt();
5. Reasons for excessive current when measuring power consumption
First confirm that it is the smallest unit, then confirm that the emulator has been unplugged
6. For the case where ADC can only be converted once: if it enters sleep mode, it is necessary to re-enable ADC before it can be used.
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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