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| ------------------------------------------------ |
| Caravel |
| irq testbench |
| ------------------------------------------------ |
| |
| This testbench demonstrates how to use the interrupts on the |
| picoRV32. It uses the internal picoRV32 counter to set up an |
| interval timer. At each timer expiration, an interrupt is |
| generated, and the assembler code in start.S runs and captures |
| data from a routine emulating a Digilent PMOD MIC-3 microphone |
| module. Data are accumulated in a ring buffer reserved in the |
| top of memory. The main loop of the program queries the |
| current ring buffer position, reads the data there, and |
| displays the value on the GPIO (upper 16 of the lower 32 GPIO |
| channels). |
