OgcLoggerUsbGecko.cpp

/****************************************************************************
 * Platform Abstraction Layer
 * Daryl Borth 2026
 * OgcLoggerUsbGecko.cpp
 ***************************************************************************/
#include "OgcLoggerUsbGecko.h"
#include <ogc/usbgecko.h>
 
namespace
{
    constexpr uint32_t PROBE_INTERVAL_MS = 1000;
    constexpr int GECKO_RETRY_SPINS_PER_BYTE = 64;
}
 
bool OgcLoggerUsbGecko::probe()
{
    attached = usb_isgeckoalive(channel) != 0;
    lastProbe = SystemTime::now();
    probed = true;
    return attached;
}
 
bool OgcLoggerUsbGecko::init(const LogConfig & config)
{
    channel = config.geckoChannel;
    probed = false;
    probe();
    return true;
}
 
void OgcLoggerUsbGecko::shutdown()
{
    attached = false;
    probed = false;
}
 
void OgcLoggerUsbGecko::write(LogLevel /*level*/, const char * line, size_t len)
{
    if (len == 0)
        return;
 
    if (!attached)
    {
        // Detached: re-probe at a bounded rate, drop the line otherwise.
        if (probed && SystemTime::diffMillisecs(lastProbe, SystemTime::now()) < PROBE_INTERVAL_MS)
            return;
        if (!probe())
            return;
    }
 
    int retries = static_cast<int>(len) * GECKO_RETRY_SPINS_PER_BYTE;
    int sent = usb_sendbuffer_safe_ex(channel, line, static_cast<int>(len), retries);
 
    if (sent < static_cast<int>(len))
    {
        // Unplugged, or the host stopped draining the Gecko's buffer.
        // Drop the rest of this line and go back to the detached state;
        attached = false;
        lastProbe = SystemTime::now();
        probed = true;
    }
}