A20 GPIO中断类型差别结果迥异的问题思考
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A20GPIO中断类型差别结果迥异的问题思考
最近在使用全志A20做开发时,发现在处理中断的时候,用电平触发模式,报中断比较乱,用边沿触发则很稳定,不会乱报。笔者感到比较困惑,笔者用电平触发写的code如下:
reverseHandle = sw_gpio_irq_request(gReverseCar_gpio_hdle.gpio, TRIG_LEVL_HIGH, \ &sw_reverseCar_irq_Handle, &privateData);if (!reverseHandle) {printk("Failed to get gpio irq for reverse car detection\n");} privateData.trigtype = TRIG_LEVL_HIGH;static int sw_reverseCar_irq_Handle(void *para){printk("IRQ sw_reverseCar_irq: %d ", privateData.trigtype);printk("IO:%d, value:%d\n",gReverseCar_gpio_hdle.gpio, \ __gpio_get_value(gReverseCar_gpio_hdle.gpio)); sw_gpio_eint_set_enable(gReverseCar_gpio_hdle.gpio, 0);sw_gpio_eint_clr_irqpd_sta(gReverseCar_gpio_hdle.gpio);//TRIG_LEVL_LOW TRIG_LEVL_HIGH TRIG_EDGE_POSITIVE TRIG_EDGE_NEGATIVEif(privateData.trigtype == TRIG_LEVL_HIGH) {if(0 == sw_gpio_eint_set_trigtype(gReverseCar_gpio_hdle.gpio,TRIG_LEVL_LOW)) privateData.trigtype = TRIG_LEVL_LOW;} else if(privateData.trigtype == TRIG_LEVL_LOW) { if(0 == sw_gpio_eint_set_trigtype(gReverseCar_gpio_hdle.gpio,TRIG_LEVL_HIGH)) privateData.trigtype = TRIG_LEVL_HIGH; } sw_gpio_eint_set_enable(gReverseCar_gpio_hdle.gpio, 1);return 0;}
中断类型设置成DEBO中断打印信息有问题,具体如下:
root@android:/ # [ 519.018955] IRQ sw_reverseCar_irq: 2 IO:188, value:1[ 519.024773] IRQ sw_reverseCar_irq: 3 IO:188, value:1[ 519.030576] IRQ sw_reverseCar_irq: 2 IO:188, value:1[ 519.036378] IRQ sw_reverseCar_irq: 3 IO:188, value:1[ 519.042169] IRQ sw_reverseCar_irq: 2 IO:188, value:1[ 520.898643] IRQ sw_reverseCar_irq: 3 IO:188, value:0[ 520.904456] IRQ sw_reverseCar_irq: 2 IO:188, value:0[ 520.910363] IRQ sw_reverseCar_irq: 3 IO:188, value:0[ 520.916215] IRQ sw_reverseCar_irq: 2 IO:188, value:0[ 520.921995] IRQ sw_reverseCar_irq: 3 IO:188, value:0[ 520.927832] IRQ sw_reverseCar_irq: 2 IO:188, value:0[ 520.933612] IRQ sw_reverseCar_irq: 3 IO:188, value:0[ 520.939432] IRQ sw_reverseCar_irq: 2 IO:188, value:0[ 520.945317] IRQ sw_reverseCar_irq: 3 IO:188, value:0
用边沿触发写的code如下,
gPrivData.trigtype = TRIG_EDGE_POSITIVE; gPrivData.irqReqHandle = sw_gpio_irq_request(gPrivData.gpio_hdle.gpio, TRIG_EDGE_POSITIVE, \ (peint_handle)&sw_reverseCar_irq_Handle, (void *)&gPrivData);static int sw_reverseCar_irq_Handle(void *para){//printk("IRQ sw_reverseCar_irq: %d ", gPrivData.trigtype);gPrivData.CarStatus = __gpio_get_value(gPrivData.gpio_hdle.gpio);//printk("io:%d, value:%d\n",gPrivData.gpio_hdle.gpio, gPrivData.CarStatus); /*if app has no capacity for handle reverse event, system need reboot*/if(1 == gPrivData.needRebootFlag) { printk("Reboot for handle reverse in boot now!\n"); *(volatile __u32 *)(0xf1c20c94) = 0x3; }up(&gPrivData.sem_lock); sw_gpio_eint_set_enable(gPrivData.gpio_hdle.gpio, 0);sw_gpio_eint_clr_irqpd_sta(gPrivData.gpio_hdle.gpio);if(gPrivData.trigtype == TRIG_EDGE_POSITIVE) {if(0 == sw_gpio_eint_set_trigtype(gPrivData.gpio_hdle.gpio,TRIG_EDGE_NEGATIVE)) gPrivData.trigtype = TRIG_EDGE_NEGATIVE;} else if(gPrivData.trigtype == TRIG_EDGE_NEGATIVE) { if(0 == sw_gpio_eint_set_trigtype(gPrivData.gpio_hdle.gpio,TRIG_EDGE_POSITIVE)) gPrivData.trigtype = TRIG_EDGE_POSITIVE; } sw_gpio_eint_set_enable(gPrivData.gpio_hdle.gpio, 1);return 0;}
EDGE时还可以设置中断类型为TRIG_EDGE_DOUBLE,笔者暂时没有采用,中断打印信息正常,如下:
root@android:/ # [ 517.116361] IRQ sw_reverseCar_irq: 0 io:188, value:1[ 518.103095] IRQ sw_reverseCar_irq: 1 io:188, value:0root@android:/ # [ 520.918512] IRQ sw_reverseCar_irq: 0 io:188, value:1[ 521.876038] IRQ sw_reverseCar_irq: 1 io:188, value:0[ 527.796107] IRQ sw_reverseCar_irq: 0 io:188, value:1[ 528.843397] IRQ sw_reverseCar_irq: 1 io:188, value:0[ 531.335858] IRQ sw_reverseCar_irq: 0 io:188, value:1[ 532.306660] IRQ sw_reverseCar_irq: 1 io:188, value:0[ 534.552011] IRQ sw_reverseCar_irq: 0 io:188, value:1[ 535.101586] IRQ sw_reverseCar_irq: 1 io:188, value:0
笔者不清楚原因,怀疑是芯片驱动的问题,但是驱动也就那样写了啊,难道是芯片设计的问题,当然这种也就是在刚有中断时会有乱irq上来,如果用delaywork延时一下处理也是可以绕过去的。望哪位大侠清楚的解释一下。
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