在pandaboard OMAP4中,GPIO_39上每隔10ms產(chǎn)生一次中斷.我已在Linux驅(qū)動(dòng)程序代碼中為此注冊(cè)了處理程序,但由于未檢測(cè)到中斷,因此未處理該處理程序.

我確保在硬件級(jí)別(通過探測(cè)gpio引腳)確實(shí)正在生成中斷.只是軟件無法檢測(cè)到它.

我在驅(qū)動(dòng)程序代碼中有以下內(nèi)容.

#define GPIO_NO 39

iowrite16(0x3,gpio_39_address + 2); /* Configured the pin 22 to be used as gpio. */

ret = gpio_request(GPIO_NO,"Claiming GPIO");

if(ret < 0)

{

printk(KERN_ALERT "%s: Claiming GPIO_%d failed\n",__func__,GPIO_NO);

return -1;

}

else

{

printk(KERN_INFO "%s: Claiming GPIO_%d successful\n",GPIO_NO);

}

ret = gpio_direction_input(GPIO_NO);

if(ret < 0)

{

printk(KERN_INFO "%s: Setting GPIO direction to input failed\n",__func__);

return -1;

}

else

{

printk(KERN_INFO "%s: Direction of GPIO_%d set to input\n",GPIO_NO);

}

GPIO_IRQ = gpio_to_irq(GPIO_NO);

if(GPIO_IRQ < 0)

{

printk(KERN_INFO "%s: Mapping GPIO_%d to IRQ failed\n",GPIO_NO);

return -1;

}

else

{

printk(KERN_INFO "%s: Mapping GPIO_%d to IRQ_%d successful\n",GPIO_NO,GPIO_IRQ);

}

if((request_irq(GPIO_IRQ,ten_ms_int,IRQF_TRIGGER_FALLING,DEVICE_NAME,NULL)))

{

printk(KERN_ALERT "%s: requeseting GPIO_IRQ %d failed\n",GPIO_IRQ);

return -1;

}

else

{

printk(KERN_INFO "%s: requesting GPIO_IRQ %d successful\n",GPIO_IRQ);

}

irqreturn_t ten_ms_int(int irq,void *dev_id)

{

T_UINT32 l;

/* Enable spi channel */

l = ioread32(spi_base + SPI_CHCONF0);

l |= SPI_CHCONF0_FORCE;

iowrite32(l,(spi_base + SPI_CHCONF0));

l = ioread32(spi_base + SPI_CHCTRL0);

l |= SPI_CHCTRL_EN;

iowrite32(l,(spi_base + SPI_CHCTRL0));

/* Enable dma channel 0 */

l = ioread32(sdma_base + SDMA_CCR(CHANNEL0));

l |= SDMA_CCR_ENABLE;

iowrite32(l,sdma_base + SDMA_CCR(CHANNEL0));

/* Enable dma channel 1 */

l = ioread32(sdma_base + SDMA_CCR(CHANNEL1));

l |= SDMA_CCR_ENABLE;

iowrite32(l,sdma_base + SDMA_CCR(CHANNEL1));

//printk(KERN_INFO "%s: 10ms interrupt detected %d\n",irq); /* I know that I've to remove this printk statement */

return IRQ_HANDLED;

}

GPIO_39屬于存儲(chǔ)體GPIO2,相應(yīng)的中斷號(hào)為32.但是,gpio_to_irq()的返回值為199.這是另一個(gè)引起關(guān)注的原因.

如果代碼中有問題或錯(cuò)過了某些內(nèi)容,請(qǐng)告訴我.

總結(jié)

以上是生活随笔為你收集整理的linux 应用层gpio中断_如何在嵌入式Linux中检测GPIO线路上的中断？的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。