segatools2/chuniio/serialimpl.c

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#include <windows.h>
#include <process.h>
#include <stdbool.h>
#include <stdint.h>
#include "chuniio/leddata.h"
#include "chuniio/serialimpl.h"
#include "util/dprintf.h"
static HANDLE serial_port;
static HANDLE serial_write_mutex;
HRESULT led_serial_init(wchar_t led_com[12], DWORD baud)
{
// Setup the serial communications
BOOL status;
serial_port = CreateFileW(led_com,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL);
if (serial_port == INVALID_HANDLE_VALUE)
dprintf("Chunithm Serial LEDs: Failed to open COM port (Attempted on %S)\n", led_com);
else
dprintf("Chunithm Serial LEDs: COM port success!\n");
DCB dcb_serial_params = { 0 };
dcb_serial_params.DCBlength = sizeof(dcb_serial_params);
status = GetCommState(serial_port, &dcb_serial_params);
dcb_serial_params.BaudRate = baud;
dcb_serial_params.ByteSize = 8;
dcb_serial_params.StopBits = ONESTOPBIT;
dcb_serial_params.Parity = NOPARITY;
SetCommState(serial_port, &dcb_serial_params);
COMMTIMEOUTS timeouts = { 0 };
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
SetCommTimeouts(serial_port, &timeouts);
if (!status)
{
return E_FAIL;
}
serial_write_mutex = CreateMutex(
NULL, // default security attributes
FALSE, // initially not owned
NULL); // unnamed mutex
if (serial_write_mutex == NULL)
{
return E_FAIL;
}
return S_OK;
}
void led_serial_update(struct _chuni_led_data_buf_t* data)
{
if (data->board > 2)
{
return;
}
if (WaitForSingleObject(serial_write_mutex, INFINITE) != WAIT_OBJECT_0)
{
return;
}
BOOL status = true;
DWORD bytes_written = 0;
if (serial_port != INVALID_HANDLE_VALUE) {
status = WriteFile(
serial_port,
data,
LED_OUTPUT_HEADER_SIZE + data->data_len,
&bytes_written,
NULL);
}
if (!status) {
DWORD last_err = GetLastError();
// dprintf("Chunithm Serial LEDs: Serial port write failed -- %d\n", last_err);
}
ReleaseMutex(serial_write_mutex);
}