PLIC Peripheral Interface

Use the SYSTEM_PLIC_CTRL parameter to reference the interface PLIC interface.

Table 1. RISC-V PLIC Operation Parameters

Defines	Description
Interrupt priorities registers	The interrupt priority for each interrupt source.
Interrupt pending bits registers	The interrupt pending status of each interrupt source.
Interrupt enables registers	Enables the interrupt source of each context.
Priority thresholds registers	The interrupt priority threshold of each context.
Interrupt claim registers	The register to acquire interrupt source ID of each context.
Interrupt completion registers	The register to send interrupt completion message to the associated gateway.

The soc.h file contains a number of PLIC parameters to specify the interrupt ID for the various peripherals.

Table 2. PLIC Interrupt ID ParametersWhere n is the peripheral number and m is the interrupt ID.

Parameter	Refer to
SYSTEM_PLIC_SYSTEM_I2C_n_IO_INTERRUPT m	Interrupt Register: 0x0000_0020 Interrupt Clears Register: 0x0000_0024
SYSTEM_PLIC_SYSTEM_GPIO_n_IO_INTERRUPTS_0 m	Interrupt Low Enable Register: 0x0000_002C Interrupt High Enable Register: 0x0000_0028 Interrupt Fall Enable Register: 0x0000_0024 Interrupt Rise Enable Register: 0x0000_0020
SYSTEM_PLIC_SYSTEM_AXI_A_INTERRUPT	Interrupts
SYSTEM_PLIC_SYSTEM_SPI_n_IO_INTERRUPT m	Interrupt Register: 0x0000_000C
SYSTEM_PLIC_SYSTEM_UART_n_IO_INTERRUPT m	Status Register: 0x0000_0004
SYSTEM_PLIC_USER_INTERRUPT_A_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_B_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_C_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_D_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_E_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_F_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_G_INTERRUPT SYSTEM_PLIC_USER_INTERRUPT_H_INTERRUPT	Interrupts
SYSTEM_PLIC_SYSTEM_USER_TIMER_n_INTERRUPTS_m	Timer Limit Register: 0x0000_00044