From dc8703206e3f0f69605c56d0e1127f7e17f3476a Mon Sep 17 00:00:00 2001
From: Jan Sucan <sucanjan@fit.cvut.cz>
Date: Tue, 4 Jun 2019 14:34:27 +0200
Subject: Initial commit

---
 testing/yup-comm/comm/serial_port.c | 144 ++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 testing/yup-comm/comm/serial_port.c

(limited to 'testing/yup-comm/comm/serial_port.c')

diff --git a/testing/yup-comm/comm/serial_port.c b/testing/yup-comm/comm/serial_port.c
new file mode 100644
index 0000000..da30fab
--- /dev/null
+++ b/testing/yup-comm/comm/serial_port.c
@@ -0,0 +1,144 @@
+/* Author: Jan Sucan */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "serial_port.h"
+
+static HANDLE  serial_port_open_port(const char * const portName);
+static BOOL    serial_port_set_timeouts(HANDLE serial_port, int ms);
+
+LPSTR
+serial_port_get_error(void)
+{
+    DWORD e = GetLastError();
+    if (e == 0) {
+      return NULL;
+    }
+
+    LPSTR msgBuff = NULL;
+    FormatMessageA(
+       FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+       NULL,
+       e,
+       MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+       (LPSTR) &msgBuff,
+       0,
+       NULL);
+
+    return msgBuff;
+}
+
+void
+serial_port_free_error(LPSTR msg)
+{
+  LocalFree(msg);
+}
+
+HANDLE
+serial_port_open_port(const char * const portName)
+{
+  HANDLE sp = INVALID_HANDLE_VALUE;
+  
+  // Construct Windows serial port name
+  char sn[16];
+  strcpy(sn, "\\\\.\\");
+  strcpy(sn + strlen(sn), portName);
+  // Open serial port  
+  sp = CreateFile(sn,             // Port name
+		  GENERIC_READ | GENERIC_WRITE, // Read/Write
+		  0,                            // No Sharing
+		  NULL,                         // No Security
+		  OPEN_EXISTING,// Open existing port only
+		  0,            // Non Overlapped I/O
+		  NULL);        // Null for Comm Devices
+
+  return sp;
+}
+
+HANDLE
+serial_port_open(const char * const portName)
+{
+    HANDLE serial_port = serial_port_open_port(portName);
+    if (serial_port == INVALID_HANDLE_VALUE) {
+      return INVALID_HANDLE_VALUE;
+    }
+    
+    // Konfiguracia
+    DCB dcbSerialParams = { 0 };
+    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
+    
+    if (GetCommState(serial_port, &dcbSerialParams) == 0) {
+      serial_port_close(serial_port);
+      return INVALID_HANDLE_VALUE;
+    }
+    
+    dcbSerialParams.BaudRate = CBR_115200;
+    dcbSerialParams.ByteSize = 8;         // Setting ByteSize = 8
+    dcbSerialParams.StopBits = ONESTOPBIT;// Setting StopBits = 1
+    dcbSerialParams.Parity   = NOPARITY;  // Setting Parity = None
+    
+    if ((SetCommState(serial_port, &dcbSerialParams) == 0)
+        || (serial_port_set_timeouts(serial_port, 3000U) == 0)) {
+      serial_port_close(serial_port);
+      return INVALID_HANDLE_VALUE;
+    }
+
+    return serial_port;
+}
+
+void
+serial_port_close(HANDLE serial_port)
+{
+    if (serial_port != INVALID_HANDLE_VALUE) {
+      CloseHandle(serial_port);
+      serial_port = INVALID_HANDLE_VALUE;
+    }
+}
+
+BOOL
+serial_port_set_timeouts(HANDLE serial_port, int ms)
+{
+    COMMTIMEOUTS timeouts;
+    
+    if (!GetCommTimeouts(serial_port, &timeouts)) {
+      return FALSE;
+    }
+    
+    timeouts.ReadIntervalTimeout = ms; 
+    timeouts.ReadTotalTimeoutMultiplier = ms;
+    timeouts.ReadTotalTimeoutConstant = 0;
+    
+    timeouts.WriteTotalTimeoutMultiplier = ms;
+    timeouts.WriteTotalTimeoutConstant = 0;
+    
+    if (!SetCommTimeouts(serial_port, &timeouts)) {
+      return FALSE;
+    }
+
+    return TRUE;
+}
+
+int
+serial_port_write_byte(HANDLE serial_port, uint8_t * const data, unsigned size)
+{   
+    DWORD written = 0;
+
+    if (!WriteFile(serial_port, data, size, &written, NULL)) {
+      written = 0;
+    }
+
+    return (written != size) ? -1 : 0;
+}
+
+int
+serial_port_read_byte(HANDLE serial_port, uint8_t * const byte)
+{
+    DWORD read;
+
+    if (!ReadFile(serial_port, byte, sizeof(uint8_t), &read, NULL)) {
+      return -1;
+    }
+
+    return (read != 0) ? 0 : -2;
+}
-- 
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