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| 1 | +import * as fs from "fs"; |
| 2 | +import { RP2040 } from "../src"; |
| 3 | +import { GPIOPinState } from "../src/gpio-pin"; |
| 4 | +import { bootromB1 } from "./bootrom"; |
| 5 | +import { loadHex } from "./intelhex"; |
| 6 | + |
| 7 | +const hex1 = fs.readFileSync("demo/dual-mcu/dual-mcu-0.hex", "utf-8"); |
| 8 | +const hex2 = fs.readFileSync("demo/dual-mcu/dual-mcu-1.hex", "utf-8"); |
| 9 | +const mcu1 = new RP2040(); |
| 10 | +const mcu2 = new RP2040(); |
| 11 | +mcu1.loadBootrom(bootromB1); |
| 12 | +mcu2.loadBootrom(bootromB1); |
| 13 | +loadHex(hex1, mcu1.flash, 0x10000000); |
| 14 | +loadHex(hex2, mcu2.flash, 0x10000000); |
| 15 | + |
| 16 | +mcu1.uart[0].onByte = (value) => { |
| 17 | + process.stdout.write(new Uint8Array([value])); |
| 18 | +}; |
| 19 | + |
| 20 | +mcu2.uart[0].onByte = (value) => { |
| 21 | + process.stdout.write(new Uint8Array([value])); |
| 22 | +}; |
| 23 | + |
| 24 | +// GPIOPinState: { Low, High, Input, InputPullUp, InputPullDown } |
| 25 | + |
| 26 | +let pin_state: number[][] = [ |
| 27 | + [0, 0, 0, 0, 0, 0, 0], // result value |
| 28 | + [3, 3, 3, 3, 3, 3, 3], // input from mcu1 (pullup initially) |
| 29 | + [3, 3, 3, 3, 3, 3, 3], // input from mcu2 (pullup initially) |
| 30 | +]; |
| 31 | +let pin_gpio: number[] = [2, 3, 4, 5, 6, 7, 8, 9]; |
| 32 | +let pin_label: string[] = ["d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7"]; |
| 33 | +let vcd_file = fs.createWriteStream("dual-mcu-bus-trace.vcd", {}); |
| 34 | +let last_conflict_cycle: number = -1; |
| 35 | + |
| 36 | +// This listener connects the two MCUs and writes a VCD signal trace file. |
| 37 | +// This code assumes pullups enabled (open collector/pullup bus). |
| 38 | +function pinListener(mcu_id: number, pin: number) { |
| 39 | + return (state: GPIOPinState, oldState: GPIOPinState) => { |
| 40 | + pin_state[mcu_id + 1][pin] = state; |
| 41 | + let v: number = |
| 42 | + pin_state[0 + 1][pin] === 0 || pin_state[1 + 1][pin] === 0 ? 0 : 1; |
| 43 | + mcu1.gpio[pin_gpio[pin]].setInputValue(v == 1 ? true : false); |
| 44 | + mcu2.gpio[pin_gpio[pin]].setInputValue(v == 1 ? true : false); |
| 45 | + |
| 46 | + // write signal to VCD file |
| 47 | + let pin_vcd_id = String.fromCharCode(pin + 34); |
| 48 | + if (pin_state[0][pin] !== v) { |
| 49 | + pin_state[0][pin] = v; |
| 50 | + vcd_file.write(`#${mcu1.core.cycles} ${v}${pin_vcd_id}\n`); |
| 51 | + } |
| 52 | + |
| 53 | + // write conflict flag to VCD file |
| 54 | + let conflict: boolean = |
| 55 | + (pin_state[0 + 1][pin] === 0 && pin_state[1 + 1][pin] === 1) || |
| 56 | + (pin_state[0 + 1][pin] === 1 && pin_state[1 + 1][pin] === 0); |
| 57 | + if (conflict) |
| 58 | + console.log( |
| 59 | + `Conflict on pin ${pin_label[pin]} at cycle ${mcu1.core.cycles} (${ |
| 60 | + pin_state[0 + 1][pin] |
| 61 | + }/${pin_state[1 + 1][pin]})` |
| 62 | + ); |
| 63 | + let have_new_conflict = conflict && last_conflict_cycle === -1; |
| 64 | + let conflict_recently_resolved = !conflict && last_conflict_cycle !== -1; |
| 65 | + if ( |
| 66 | + conflict_recently_resolved && |
| 67 | + mcu1.core.cycles === last_conflict_cycle |
| 68 | + ) { |
| 69 | + // one mcu set conflict and other resolved in same cycle: |
| 70 | + // delay until next signal change so that the conflict signal is visible in VCD |
| 71 | + return; |
| 72 | + } |
| 73 | + let write_conflict_flag: boolean = |
| 74 | + have_new_conflict || conflict_recently_resolved; |
| 75 | + if (write_conflict_flag) { |
| 76 | + vcd_file.write(`#${mcu1.core.cycles} ${conflict ? 1 : 0}!\n`); |
| 77 | + } |
| 78 | + last_conflict_cycle = conflict ? mcu1.core.cycles : -1; |
| 79 | + }; |
| 80 | +} |
| 81 | + |
| 82 | +for (let i = 0; i < pin_label.length; i++) { |
| 83 | + mcu1.gpio[pin_gpio[i]].addListener(pinListener(0, i)); |
| 84 | + mcu2.gpio[pin_gpio[i]].addListener(pinListener(1, i)); |
| 85 | +} |
| 86 | + |
| 87 | +mcu1.core.PC = 0x10000000; |
| 88 | +mcu2.core.PC = 0x10000000; |
| 89 | + |
| 90 | +// write VCD file header |
| 91 | +vcd_file.write("$timescale 1ns $end\n"); |
| 92 | +vcd_file.write("$scope module logic $end\n"); |
| 93 | +vcd_file.write(`$var wire 1 ! bus_conflict $end\n`); |
| 94 | +for (let pin = 0; pin < pin_label.length; pin++) { |
| 95 | + let pin_vcd_id = String.fromCharCode(pin + 34); |
| 96 | + vcd_file.write(`$var wire 1 ${pin_vcd_id} ${pin_label[pin]} $end\n`); |
| 97 | +} |
| 98 | +vcd_file.write("$upscope $end\n"); |
| 99 | +vcd_file.write("$enddefinitions $end\n"); |
| 100 | + |
| 101 | +function run_mcus() { |
| 102 | + let cycles_mcu2_behind = 0; |
| 103 | + for (let i = 0; i < 100000; i++) { |
| 104 | + if (mcu1.core.cycles % (1 << 25) === 0) |
| 105 | + console.log(`clock: ${mcu1.core.cycles / 125000000} secs`); |
| 106 | + // run mcu1 for one step, take note of how many cycles that took, |
| 107 | + // then step mcu2 until it caught up. |
| 108 | + let cycles = mcu1.core.cycles; |
| 109 | + mcu1.step(); |
| 110 | + cycles_mcu2_behind += mcu1.core.cycles - cycles; |
| 111 | + while (cycles_mcu2_behind > 0) { |
| 112 | + cycles = mcu2.core.cycles; |
| 113 | + mcu2.step(); |
| 114 | + cycles_mcu2_behind -= mcu2.core.cycles - cycles; |
| 115 | + } |
| 116 | + } |
| 117 | + setTimeout(() => run_mcus(), 0); |
| 118 | +} |
| 119 | + |
| 120 | +run_mcus(); |
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