Warehouse temperature alarm system based on GD32---GPIO port lighting

yin_wu_qing

Warehouse temperature alarm system based on GD32---GPIO port lighting [Copy link]

     During the National Day holiday, recharge yourself. Based on the GD32 MCU development, I found in the debugging code that when using GPIOA_3 to light up the external extended LED light, the LED light never lights up. At first, I thought it was because the expansion board made before had poor contact due to oxidation. Later, I used a multimeter to measure and confirm that the light-emitting diode had voltage, but it was always a high level of 3.3V, and no voltage drop occurred. Later, GPIOA_3 was changed to GPIOA_8, and the bad phenomenon was solved. I developed it in the demo package of GD32F350. This GPIOA_3 may be occupied by the routine in the demo package, and it has been pulled high, or the port is not enabled by the clock.