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/**********************************************************************//**
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/**********************************************************************//**
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* @file demo_xirq/main.c
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* @file demo_xirq/main.c
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* @author Stephan Nolting
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* @author Stephan Nolting
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* @brief External interrupt controller (XIRQ) demo program.
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* @brief External interrupt controller (XIRQ) demo program (using hardware-assisted prioritization).
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**************************************************************************/
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**************************************************************************/
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#include <neorv32.h>
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#include <neorv32.h>
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neorv32_gpio_port_set(0xF); // set output pins 3:0 -> trigger XIRQ 3:0
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neorv32_gpio_port_set(0xF); // set output pins 3:0 -> trigger XIRQ 3:0
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neorv32_gpio_port_set(0x0);
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neorv32_gpio_port_set(0x0);
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}
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}
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// wait for interrupts
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// --- wait for interrupts ---
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// All incoming XIRQ interrupt requests are "prioritized" in this example. The XIRQ FIRQ handler
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// reads the ID of the interrupt with the highest priority from the XIRQ controller ("source" register) and calls the according
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// handler function.
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// Non-prioritized handling of interrupts (or custom prioritization) can be implemented by manually reading the
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// XIRQ controller's "pending" register. It is up to the software to define which pending IRQ should be served.
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while(1);
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while(1);
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// just as an example: to disable certain XIRQ interrupt channels, we can
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// just as an example: to disable certain XIRQ interrupt channels, we can
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// uninstall the according handler. this will also clear a pending interrupt for that channel
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// un-install the according handler. this will also clear a pending interrupt for that channel
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neorv32_xirq_uninstall(0); // disable XIRQ channel 0 and remove associated handler
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neorv32_xirq_uninstall(0); // disable XIRQ channel 0 and remove associated handler
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neorv32_xirq_uninstall(1); // disable XIRQ channel 1 and remove associated handler
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neorv32_xirq_uninstall(1); // disable XIRQ channel 1 and remove associated handler
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neorv32_xirq_uninstall(2); // disable XIRQ channel 2 and remove associated handler
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neorv32_xirq_uninstall(2); // disable XIRQ channel 2 and remove associated handler
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neorv32_xirq_uninstall(3); // disable XIRQ channel 3 and remove associated handler
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neorv32_xirq_uninstall(3); // disable XIRQ channel 3 and remove associated handler
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