GPIO的翻转速度指：输入/输出寄存器的0 ，1 值反映到外部引脚高低电平的速度.
代码在示例SampleCode\01_GPIO_Basic代码上修改而来，具体如下：
- int main(void)
- {
- InitDelay();
- InitDebug();
- GPIO_LedInit();
- GPIO_KeyInit();
- TIMER_PrdInit();
- printf("Hi This is GPIO Basic Demo !\r\n");
- while (1)
- {
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- GPIOA->ODR |= (1<<2);
- GPIOA->ODR &= ~(1<<2);
- // GPIO_ScanKeyInput();
- // GPIO_ToggleLedPrd();
- }
- }
从波形上看，可以达到1.61MHz。GPIO寄存器好似没有速度调试的寄存器，如果是spi的状态下不知道可以达到多少速度。
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