我正在使用RTAI Patch 5.2在Linux内核3.18.20中解决问题。我发现驱动程序注册的中断频率很高，大约是20us /次。
我尝试更改其触发类型，以查看触发方式是否错误。
err = request_irq(dev->irq, sja1000_interrupt, IRQF_TRIGGER_HIGH | IRQF_SHARED | IRQF_ONESHOT,
dev->name, (void *)dev);
PINFO("priv->flags=%x\n",priv->flags);
if(irq_set_irq_type(dev->irq,IRQ_TYPE_LEVEL_HIGH))
PERROR("could not set irq %d type\n",dev->irq);
else
PINFO("set irq %d type success\n",dev->irq);
request_irq和irq_set_irq_type看起来不错，返回值为0。但是当我使用irq_get_irq_type时，它总是返回0。
中断号为 16 。以下/proc/interrupt/显示
它没有更改其触发类型。
CPU0 CPU1 CPU2 CPU3
0: 57 0 0 0 IO-APIC-edge timer
1: 12 0 0 0 IO-APIC-edge i8042
7: 1 0 0 0 IO-APIC-edge
9: 0 0 0 0 IO-APIC-fasteoi acpi
12: 1 0 0 0 IO-APIC-edge
16: 998473 0 49801960 0 IO-APIC 16-fasteoi can0
17: 52 0 0 0 IO-APIC 17-fasteoi mmc0
18: 0 0 0 0 IO-APIC 18-fasteoi mmc1
23: 28409 0 0 0 IO-APIC 23-fasteoi ehci_hcd:usb1, mmc2
87: 1905 0 0 0 PCI-MSI-edge i915
88: 0 0 0 0 PCI-MSI-edge eth0
89: 471 0 5 0 PCI-MSI-edge eth0-TxRx-0
90: 6 0 0 470 PCI-MSI-edge eth0-TxRx-1
91: 6 465 5 0 PCI-MSI-edge eth0-TxRx-2
92: 6 0 10 460 PCI-MSI-edge eth0-TxRx-3
93: 1 0 0 0 PCI-MSI-edge eth1
94: 32 0 0 666 PCI-MSI-edge eth1-TxRx-0
95: 18 506 9 0 PCI-MSI-edge eth1-TxRx-1
96: 23 0 53 485 PCI-MSI-edge eth1-TxRx-2
97: 113 561 13 0 PCI-MSI-edge eth1-TxRx-3
NMI: 31 0 94 21 Non-maskable interrupts
LOC: 1373419 2014 939934 1115589 Local timer interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 31 0 94 21 Performance monitoring interrupts
IWI: 2528 0 642 0 IRQ work interrupts
RTR: 0 0 0 0 APIC ICR read retries
RES: 195337 1 19434 42295 Rescheduling interrupts
CAL: 143 162 118 101 Function call interrupts
TLB: 571 0 290 640 TLB shootdowns
TRM: 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 Threshold APIC interrupts
MCE: 0 0 0 0 Machine check exceptions
MCP: 4 4 4 4 Machine check polls
ERR: 1
MIS: 0
是否可以设置irq 16的触发类型？