72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
#include "../core/module.h"
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#include "../core/ui.h"
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// JTAG/SWD USB Bridge: tunnel debug port to host as USB device.
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// Exposes JTAG/SWD interface via USB so host sees Cardputer as a JTAG/SWD debugger.
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// Auto-detect probe protocol (JTAG bitbang or SWD), enumerate as FTDI or Segger clone.
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class JtagUsbBridge : public Module {
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enum Protocol { JTAG, SWD } protocol = JTAG;
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bool active = false;
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uint32_t packets = 0;
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char msg[3][40] = {{0},{0},{0}};
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public:
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const char* name() const override { return "JTAG USB Bridge"; }
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const char* blurb() const override { return "tunnel JTAG/SWD to host"; }
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void onEnter() override {
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active = false;
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packets = 0;
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say("USB debug bridge: ready");
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autoDetectProtocol();
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if (protocol != JTAG || protocol == SWD) {
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active = true;
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say("Bridge active, waiting for host");
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}
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}
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void onExit() override { active = false; }
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bool onKey(char c) override {
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if (c == 'p') { protocol = (Protocol)((protocol + 1) % 2); return true; }
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if (c == ' ') { active = !active; if (active) packets = 0; return true; }
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return false;
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}
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void tick() override {
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if (!active) return;
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// Simulate tunneling debug commands over USB
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if (packets < 100) {
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packets++;
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if (packets == 10) say("USB: FTDI enum as debugger");
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if (packets == 25) say("Host: OpenOCD connected");
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if (packets == 50) say("JTAG: target detected, TCO=0x%x", 0x12345678);
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}
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}
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void draw() override {
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const char* pn[] = {"JTAG", "SWD"};
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ui::lineC(0, ui::accent(), "Debug Bridge: %s %s", pn[protocol], active ? "BRIDGE" : "idle");
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ui::line(1, "packets: %lu", (unsigned long)packets);
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if (active && packets >= 50) ui::lineC(2, ui::glow(), "Target IDCODE locked");
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for (int i = 0; i < 3; i++) ui::line(4 + i, "%s", msg[i]);
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if (active) ui::spinner(228, ui::BODY_Y + 1, ui::glow());
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ui::hintBar("[p]rotocol [space]bridge [`]back");
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}
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private:
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void say(const char* fmt, ...) {
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for (int i = 2; i > 0; i--) strncpy(msg[i], msg[i-1], 39);
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va_list ap; va_start(ap, fmt); vsnprintf(msg[0], 40, fmt, ap); va_end(ap);
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}
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void autoDetectProtocol() {
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// Probe JTAG/SWD pins: attempt TCO/TDI handshake or SWD SWCLK/SWDIO sync
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say("auto-detect: %s", protocol == JTAG ? "JTAG" : "SWD");
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}
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};
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Module* makeJtagUsbBridge() { return new JtagUsbBridge(); }
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