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Lyu.1
Associate III
since ‎2020-04-17
‎2024-10-05

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  • 41 Posts
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GPIO pin transient load current capacity

2024-09-25
Master:Platform: stm32G070cbQuesion:The MCU pin is driven through a 100R resistor to drive an N-channel MOS transistor (2N7002, Ciss < 50pF).When the pin is given a high output, the starting transient current peak approximates I = 3.3V / 100R = 33mA,...

CMOS- and TTL-compliant

2024-08-19
Hi,Master:platform: STM32G070CBQuesion:       Regarding CMOS - and TTL compliant, the manual provides the above diagram. How does it achieve compatibility? When Vin>min (07 x VDDIO, 2), is it considered that the input is at a high level? When Vin<min...

Voltage withstand of MCU pins

2024-08-16
Hi,Master:platform: STM32G070CBphenomenon:When the MCU is empty (without any program), connect an external pull-up resistor 10K to the adjustable voltage source on the PA4 pin, adjust the voltage in the range of 4~18V, and find that the maximum clamp...

Pack alignment exception issue

2024-03-28
Hi,Master:platform: STM32G070CBkeil ide:  arm Compiler:version 5 (c99 mode)Question: #pragma pack(8) typedef struct{ uint32_t a; uint8_t b; uint32_t c; uint32_t d; uint32_t e; } x_t; #pragma pack() x_t a[10] = {0}; int sz = siz...

Racing adventure in OS

2021-11-17
Hi,Master:Question 1:As shown in the figure below, why does the api read this variable with critical protection?Question 2:Suppose two tasks have write operations to shared variables. For example:int var; void task1(void) { OS_ENTER_CRITICAL(); ...
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