#define LPC_GPIO0_BASE 0x2009C000
#define LPC_GPIO1_BASE 0x2009C020
#define LPC_GPIO2_BASE 0x2009C040
#define LPC_GPIO3_BASE 0x20098060
#define LPC_GPIO4_BASE 0x2009C080
typedef enum {
GPIOINT_PORT0, /*!< GPIO PORT 0 */
GPIOINT_PORT2 = 2 /*!< GPIO PORT 2 */
}LPC_GPIOINT_PORT_T;
#define LPC_GPIO ((LPC_GPIO_T *) LPC_GPIO0_BASE)
#define LPC_GPIOINT ((LPC_GPIOINT_T *) LPC_GPIOINT_BASE)
#define GPIO_INTERRUPT_PIN 17 /* GPIO pin number mapped to interrupt */
#define GPIO_INTERRUPT_PORT GPIOINT_PORT0 /* GPIO port number mapped to interrupt */
int main(void)
{
/* Generic Initialization */
SystemCoreClockUpdate();
/* Board_Init calls Chip_GPIO_Init and enables GPIO clock if needed,
Chip_GPIO_Init is not called again */
Board_Init();
Board_LED_Set(0, false);
/* Configure GPIO interrupt pin as input */
Chip_GPIO_SetPinDIRInput(LPC_GPIO, GPIO_INTERRUPT_PORT, GPIO_INTERRUPT_PIN);
/* Configure the GPIO interrupt */
Chip_GPIOINT_SetIntFalling(LPC_GPIOINT, GPIO_INTERRUPT_PORT, 1 << GPIO_INTERRUPT_PIN);
/* Enable interrupt in the NVIC */
NVIC_ClearPendingIRQ(GPIO_INTERRUPT_NVIC_NAME);
NVIC_EnableIRQ(GPIO_INTERRUPT_NVIC_NAME);
/* Wait for interrupts - LED will toggle on each wakeup event */
while (1) {
__WFI();
}
return 0;
}
不太明白这个函数中 形参 port的具体定义,一开始以为是P0~P4,但是看到enum里面只有 0和2,,瞬间傻了,不知道这个Port是干嘛的,而且这个Port形参每个IO口程序里面都有
STATIC INLINE void Chip_GPIO_SetPinDIRInput(LPC_GPIO_T *pGPIO, uint8_t port, uint8_t pin)
{
pGPIO[port].DIR &= ~(1UL << pin);
}
STATIC INLINE void Chip_GPIOINT_SetIntFalling(LPC_GPIOINT_T *pGPIOINT, LPC_GPIOINT_PORT_T port, uint32_t pins)
{
if (port == GPIOINT_PORT0) {
pGPIOINT->IO0.ENF = pins;
} else {
pGPIOINT->IO2.ENF = pins;
}
}
楼主你好!
你的理解其实没错,port就是PIN的port,比如PIO0_17,那么它的port就是0,。
/**
* @brief Set GPIO direction for a single GPIO pin to an input
* @param pGPIO : The base of GPIO peripheral on the chip
* @param port : GPIO Port number where pin is located
* @param pin : GPIO pin to set direction on as input
* @return Nothing
*/
STATIC INLINE void Chip_GPIO_SetPinDIRInput(LPC_GPIO_T *pGPIO, uint8_t port, uint8_t pin)
{
pGPIO[port].DIR &= ~(1UL << pin);
}
还是以PIO0_17为例的调用:
Chip_GPIO_SetPinDIRInput(LPC_GPIO, 0 ,17);
你现在不明白的是这个定义
typedef enum {
GPIOINT_PORT0, /*!< GPIO PORT 0 */
GPIOINT_PORT2 = 2 /*!< GPIO PORT 2 */
}LPC_GPIOINT_PORT_T;
但是,你没有注意这个定义是在哪里?gpioint_17xx_40xx.h.
这个是gpio中断,对于GPIO中断,你可以在user manual的GPIO章节也能看到相关内容。
只有 port0和port2支持中断,那么在中断的头文件中还有必要定义其他的port口吗?
我想这样解释你应该清楚多了。
希望能帮到你,如果还有问题,欢迎继续交流!
Have a great day,
Kerry
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