Hello guys,
I am working on a project, where I want to make two MCUs communicate with each other. I am using STM32F29ZI. I am using the example sketch UDPSendReceiveString and it works fine. The two MCUs have different MAC-Addresses and IPs. And one of them begins to send a message. After that the infinite loop begins..
#include <SPI.h>
#include <LwIP.h>
#include <STM32Ethernet.h>
#include <EthernetUdp.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xFF
};
IPAddress ip(192, 168, 1, 176);
IPAddress server(192, 168, 1, 177);
const int slaveSelectPin = 7;
unsigned int localPort = 8888; // local port to listen on
// buffers for receiving and sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; // buffer to hold incoming packet,
char ReplyBuffer[] = "acknowledged"; // a string to send back
// An EthernetUDP instance to let us send and receive packets over UDP
EthernetUDP Udp;
void setup() {
pinMode (slaveSelectPin, OUTPUT);
// start the Ethernet
SPI.begin();
Ethernet.begin(mac, ip);
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
if (Ethernet.linkStatus() == LinkOFF) {
Serial.println("Ethernet cable is not connected.");
}
// start UDP // only one of them
Udp.begin(localPort);
Udp.beginPacket(server,localPort);
Udp.write(ReplyBuffer);
Udp.endPacket();
}
void loop() {
// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if (packetSize) {
Serial.print("Received packet of size ");
Serial.println(packetSize);
Serial.print("From ");
IPAddress remote = Udp.remoteIP();
for (int i=0; i < 4; i++) {
Serial.print(remote[i], DEC);
if (i < 3) {
Serial.print(".");
}
}
Serial.print(", port ");
Serial.println(Udp.remotePort());
// read the packet into packetBufffer
Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
Serial.println("Contents:");
Serial.println(packetBuffer);
// send a reply to the IP address and port that sent us the packet we received
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(ReplyBuffer);
Udp.endPacket();
}
delay(10);
}
Soo the code above works, but if I paste this code right under void loop{:
void loop() {
SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE2));
SPI.endTransaction();
it wont work anymore, and I have really not one idea, why it doesnt.
I need your help please..
LG
Furkan