I’m playing with Endpoint and particularly with UART port (@Greg_Norris I use a click GPS Module on click 2 socket 
).
I can’t read any data on UART port. (I try a TinyClr program and data is correctly received).
I discover that the number of UARTs is not label as in linux (as I can’t verify UART port, it is just a guess for now !) - maybe it could be written in doc:
| Linux |
Pinout |
Remarks |
| /dev/ttySTM0 |
UART1 |
|
| /dev/ttySTM1 |
UART2 |
|
| /dev/ttySTM2 |
UART3 |
|
| /dev/ttySTM3 |
UART4 |
|
| /dev/ttySTM4 |
UART5 |
Can’t be access but it does exist on pinout (BUG ?) |
| /dev/ttySTM5 |
UART6 |
Doesn’t exist but I think it is normal as it doesn’t exist on pinout |
| /dev/ttySTM6 |
UART7 |
|
| /dev/ttySTM7 |
UART8 |
|
Here is code to test:
using System.IO.Ports;
using System.Device.Gpio.Drivers;
using System.Device.Gpio;
using GHIElectronics.Endpoint.Core;
using System.Diagnostics;
using System.Text;
namespace testEndpointGPSSimple
{
internal class Program
{
static byte[] buffer = new byte[64];
static void Main(string[] args)
{
Console.WriteLine("Start...");
// Reset pin
var pinNumber = EPM815.Gpio.Pin.PF4;
var port = pinNumber / 16;
var pin = pinNumber % 16;
var gpioDriver = new LibGpiodDriver(port);
var gpio = new GpioController(PinNumberingScheme.Logical, gpioDriver);
gpio.OpenPin(pin);
gpio.SetPinMode(pin, PinMode.Output);
var _serial = new SerialPort
{
PortName = "/dev/ttySTM2",
BaudRate = 9600,
DataBits = 8,
Parity = Parity.None,
StopBits = StopBits.One,
};
// Reset GPS Click
Console.WriteLine("Reset GPS");
gpio.Write(pin, PinValue.High);
Thread.Sleep(100);
gpio.Write(pin, PinValue.Low);
Thread.Sleep(200);
gpio.Write(pin, PinValue.High);
Thread.Sleep(100);
_serial.Open();
Console.WriteLine("Awaiting data...");
while (true)
{
// Read data if any
if (_serial.BytesToRead > 0)
{
var received = _serial.Read(buffer, 0, _serial.BytesToRead);
Debug.Write(Encoding.UTF8.GetString(buffer, 0, received));
}
Thread.Sleep(20);
}
}
}
}
You are right, we just saw these issue yesterday :).
UART6 does not exist, and UART5 has wrong alternate so it doesn’t work.
We will remove UART6, and correct UART5 in next release
But it won’t explain why I can’t read on UART3 !
add EPM815.SerialPort.Initialize(EPM815.SerialPort.Uart3); before opening serial
These four: SPI, I2C, PWM, UART you need “EPM815.xxxx.Initialize” before use them.
I begin to discover Endpoint with … UART ! The only one for which it’s not write in doc 
Does it explain why you can’t read UART3 yet ?
1 Like
Yes, of course.
And I can read what GPS send.
2 Likes
Which GPS click module did you use? We’ll have to get one if we don’t already have it. Can’t wait to try it with the Google Maps project!
All modules should be compatible or very close
1 Like
My attempt to get longitutde and latitude (Parser is in TinyClr Library ):
using System.IO.Ports;
using System.Device.Gpio.Drivers;
using System.Device.Gpio;
using GHIElectronics.Endpoint.Core;
using System.Diagnostics;
using System.Text;
namespace testEndpointGPSSimple
{
internal class Program
{
static byte[]? _lastSentence;
static byte[] reader = new byte[512];
static int idxReader = 0;
static byte[] buffer = new byte[64];
static bool started = false;
static double _latitude;
static double _longitude;
static char _latitudeHemisphere;
static char _longitudeOrientation;
static void Main(string[] args)
{
Console.WriteLine("Start...");
// Reset pin
var pinNumber = EPM815.Gpio.Pin.PF4;
var port = pinNumber / 16;
var pin = pinNumber % 16;
var gpioDriver = new LibGpiodDriver(port);
var gpio = new GpioController(PinNumberingScheme.Logical, gpioDriver);
gpio.OpenPin(pin);
gpio.SetPinMode(pin, PinMode.Output);
var _serial = new SerialPort
{
PortName = "/dev/ttySTM2",
BaudRate = 9600,
DataBits = 8,
Parity = Parity.None,
StopBits = StopBits.One,
};
EPM815.SerialPort.Initialize(EPM815.SerialPort.Uart3);
// Reset GPS Click
Console.WriteLine("Reset GPS");
gpio.Write(pin, PinValue.High);
Thread.Sleep(100);
gpio.Write(pin, PinValue.Low);
Thread.Sleep(200);
gpio.Write(pin, PinValue.High);
Thread.Sleep(100);
_serial.Open();
Console.WriteLine("Awaiting data...");
while (true)
{
// Read data if any
if (_serial.BytesToRead > 0)
{
var received = _serial.Read(buffer, 0, buffer.Length);
ProcessBuffer(received);
}
// Check Parser state
if (Parser.GLLSentence.Status == 'A')
{
var latitude = Parser.GLLSentence.Latitude;
if (latitude != 0)
{
// Get Data
if (_latitude != latitude)
{
_latitude = latitude;
_latitudeHemisphere = Parser.GLLSentence.LatitudeHemisphere;
//Display Data
Debug.WriteLine("Lat: " + _latitude + _latitudeHemisphere);
}
if (_longitude != Parser.GLLSentence.Longitude)
{
_longitude = Parser.GLLSentence.Longitude;
_longitudeOrientation = Parser.GLLSentence.LongitudePosition;
//Display Data
Debug.WriteLine("Lon: " + _longitude + _longitudeOrientation);
}
}
}
Thread.Sleep(20);
}
}
private static void ProcessBuffer(int received)
{
for (int i = 0; i < received; i++)
{
var ch = Encoding.UTF8.GetString(buffer, i, 1);
if (!started)
if (ch == "$")
{
idxReader = 0;
reader[idxReader] = buffer[i];
started = true;
idxReader++;
}
else
{
// Discard byte
}
else
{
if (ch == "$") // Already started, so restart
{
idxReader = 0;
reader[idxReader] = buffer[i];
started = true;
idxReader++;
}
else if (ch == "\r")
{ // End of sentence
started = false;
// Get sentence from reader idx 0 to idxReader
_lastSentence = new byte[idxReader];
Array.Copy(reader, _lastSentence, idxReader);
ProcessSentence(_lastSentence);
}
else
{ // Keep copying
reader[idxReader] = buffer[i];
idxReader++;
}
}
}
}
private static void ProcessSentence(byte[] lastSentence)
{
// Debug.WriteLine(Encoding.UTF8.GetString(lastSentence));
Parser.Parse(lastSentence);
}
}
}
1 Like
…I’ll fix the docs!