驱动里怎么设置低电平触发？不生效啊
Hi experts,I have trouble about interrupt. I need low level trigger the interrupt. My control flow is that when data is less than a threshold, it needs keeping interrupt until data is supplied.
So I use the flag `IRQ_TYPE_LEVEL_LOW `, but it doesn’t work. I have also tried `IRQF_TRIGGER_LOW`, it also doesn’t work.
I have checked the hardware register, the interrupt GPIO is still `falling edges`, not `low level`.
My board is ARM S3C6410 tiny board.
221 /* inkprinter */
222 #define S3C64XX_PA_INKPRINTER (0x30000000)
223 #define S3C64XX_SZ_INKPRINTER SZ_1M
224 static struct resource inkprinter_resources[] = {
225 = {
226 .start = S3C64XX_PA_INKPRINTER,
227 .end = S3C64XX_PA_INKPRINTER + S3C64XX_SZ_INKPRINTER,
228 .flags = IORESOURCE_MEM,
229 },
230 = {
231 .start = IRQ_EINT(1),
232 .end = IRQ_EINT(1),
233 .flags = IORESOURCE_IRQ | IRQ_TYPE_LEVEL_LOW,
234 }
235 };
236 static struct platform_device s3c_device_inkprinter = {
237 .name = "inkprinter",
238 .num_resources = ARRAY_SIZE(inkprinter_resources),
239 .resource = inkprinter_resources,
240 };
241
My question is :
Is `IRQ_TYPE_LEVEL_LOW ` or `IRQF_TRIGGER_LOW `for low level trigger? Or some other problem? Any tips?
Your response will be highly appreciated.
欢迎大家帮忙解答。
感觉还是老的定义方式，现在新的都是dts了。
我觉得原因可能是你request_irq的时候没有带IRQ_TYPE_LEVEL_LOW这个标记。 回复 2# linuxlife123
感谢！
后来发现是你说的问题，这里设置没什么大用。
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