I am using STM32F103C8 board and CubeMX to create the code. I have connected the M66 to STM32 to UART2 port. I try to send some commands to Quectel M66 via STM32's UART port. It receives the command but throws some junk characters. I have set the baud rate as 9600 for all UART ports. This is my code
void M66_Check()
{
char *buffer = "ATI\r\n";
char *rec_buffer = NULL;
rec_buffer = (char*)malloc(200 * sizeof(char));
if(HAL_UART_Transmit(&huart2,buffer,strlen(buffer),200) == HAL_OK)
{
printf("AT Command sent successfully\r\n");
HAL_Delay(1000);
}
else
{
printf("Not Sent\r\n");
}
HAL_UART_Receive(&huart2,rec_buffer,50,200);
printf("About to print Response from M66 \r\n");
HAL_Delay(2000);
printf(rec_buffer);
}
This is what I am getting...Result in Putty
Any help would be greatly appreciated
There is the only way - read the answer and parse it. Then you will know if the command was executed ok.
But your response shows that your UART is running another speed (9600) than the modem. If you have not changed anything it should be 115200 as it is default modem UART speed
I have found out the problem... I needed to transmit and receive in these formats....
I missed those (uint8_t *).
To Transmit -
HAL_UART_Transmit(&huart2, (uint8_t *)buffer, strlen(buffer), 100);
To Receive -
HAL_UART_Receive(&huart2, (uint8_t *)rec_buffer,50,2000);
Now there is no problem and I am getting the response correctly.
Thanks for your help...
Related
I am workin in a proyect where i need to make a bridge between to uart's. I am using the STM32F072CB Basically, all the data that I receive to the uart1 rx must be sent by uart2 tx. In the same way, what I receive in uart2 rx I must send through uart1 tx.(Both UARTs have the same baudrate). I am not aware of how much data I can receive on the rx uarts.
This is the idea
Uart1 rx --------> Uart2 tx
Uart1 tx <-------- Uart2 rx
I am using DMA with HAL_UARTEx_ReceiveToIdle_DMA to reduce cpu processing.
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
DMA_HandleTypeDef hdma_usart1_rx;
DMA_HandleTypeDef hdma_usart2_rx;
#define RXBuffSize 10
uint8_t RxBuff1[RxBuffSize];
uint8_t RxBuff2[RxBuffSize];
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_DMA_Init();
MX_USART1_UART_Init();
MX_USART2_UART_Init();
HAL_UARTEx_ReceiveToIdle_DMA(&huart1,RxBuff1,RxBuffSize);
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx,DMA_IT_HT);
HAL_UARTEx_ReceiveToIdle_DMA(&huart2,RxBuff2,RxBuffSize);
__HAL_DMA_DISABLE_IT(&hdma_usart2_rx,DMA_IT_HT);
while (1)
{}
}
Here is my DMA interruption callback function
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
if (huart->Instance == USART1)
{
HAL_UART_Transmit(&huart2,RxBuff1,RxBuffSize,1);
HAL_UARTEx_ReceiveToIdle_DMA(&huart1,RxBuff1,RxBuffSize);
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx,DMA_IT_HT);
}
else if (huart->Instance == USART2)
{
HAL_UART_Transmit(&huart1,RxBuff2,RxBuffSize,1);
HAL_UARTEx_ReceiveToIdle_DMA(&huart2,RxBuff2,RxBuffSize);
__HAL_DMA_DISABLE_IT(&hdma_usart2_rx,DMA_IT_HT);
}
}
The code runs when the data input to rx is low. If I send too much data in the tx of the other uart I get the first bytes but lose the last ones. I also tried doing the RXBuffSize = 1 , that is to say receive a character and send it but I get the same result.
Because HAL_UART_Transmit operates in a "polling" method, it stops at the point until all strings are transmitted.
Therefore, if another string comes in while HAL_UART_Transmit is being executed, the interrupt is not executed and the entered string is lost.
After activating the TX DMA of each uart in cubemx, try applying the code as shown below.
#include <string.h>
uint8_t TxBuff1[RxBuffSize];
uint8_t TxBuff2[RxBuffSize];
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
Size = Size > RxBuffSize ? RxBuffSize : Size;
if (huart->Instance == USART1)
{
memcpy(TxBuff2, RxBuff1, Size);
HAL_UART_Transmit_DMA(&huart2, TxBuff2, Size);
HAL_UARTEx_ReceiveToIdle_DMA(&huart1, RxBuff1, RxBuffSize);
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx, DMA_IT_HT);
}
else if (huart->Instance == USART2)
{
memcpy(TxBuff1, RxBuff2, Size);
HAL_UART_Transmit_DMA(&huart1, TxBuff1, Size);
HAL_UARTEx_ReceiveToIdle_DMA(&huart2, RxBuff2, RxBuffSize);
__HAL_DMA_DISABLE_IT(&hdma_usart2_rx, DMA_IT_HT);
}
}
Transmitting RxBuff directly is dangerous. When a character is received from the UART while sending, an incorrect value may be sent by the TX DMA because RX DMA changes the value in the corresponding memory.
Therefore, when RX DMA is deactivated, it is better to enable it after copying the corresponding memory value to another location.
I have compiled code to transmit data from an STM32 board to the Arduino Uno and print it on the serial terminal. I have previously written code, similar to this and it worked as expected.
However, when I try transmitting a string from the STM32 this time, the TX-Led of the Arduino blinks, which is strange.
I have checked the baud rate of both devices and they match. On the serial terminal of the Arduino, backward question marks are printed when I am transmitting a short string "Test".
Please could someone help me identify any potential problems with what I have done.
The code for the STM32 UART settings was generated by cubeMX:
static void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;`
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}
The string and HAL_UART instruction to transmit the data:
char let[30] = "Test\r\n";
HAL_UART_Transmit(&huart1, (uint8_t*)let, strlen(let), 1000);
All necessary functions (MX_USART1_UART_Init()) have been called and the HAL_UART_Transmit() is in the while loop, situated in the main loop, as I have cross-checked that.
My arduino program:
void setup() {
Serial.begin(115200);
// Define the LED pin as Output
pinMode (13, OUTPUT);
Serial.println("Arduino UART Receiver");
Serial.println("-----------------------------");
}
void loop() {
digitalWrite(13, LOW);
//wait until something is received
while(! Serial.available());
digitalWrite(13, HIGH);
//read the data
char in_read=Serial.read();
//print the data
Serial.print(in_read);
}
Arduino Uno has only one USART hardware, and it's connected to a USART-USB converter chip. This bus is point-to-point and can't be shared by another device when there is an active connection between Arduino and PC.
The RX pin of the Arduino is driven by two devices: STM32 and the converter chip. Converter tries to keep that line at logic high (because the TX coming from the PC is idle) while STM32 tries to drive that line with its own TX. Anything can happen there... Arduino is probably getting junk from its RX line.
If you can somehow disconnect Arduino RX from the converter chip (cutting the trace for example) it will probably work. But then you won't be able to program Arduino again.
You may use a software serial pin instead of the hardware RX pin. I don't have much experience with Arduino but I'm sure there must be software serial libraries out there.
I'm working on a code to communicate two arduinos, one with ethernet shield and another with an ENC28J60 ethernet module. I'm not a newbie in arduino neither an wise/expert yet. But i'm a complete -and less than a- newbie in UDP communication.
Here is the question: my code works fine, it sends and receives UDP packets from one to another and viceversa. But after every packet is sent, it increment in one the "Udp.remotePort" value (that viewing from the "udp-reader" side). It starts from 1024 up to ~32000 (and starts over after reach the highest value). I have researched about UDP and i understand that the first 0-1023 are reserved for specifics services p.e. 80 http, 21 ftp. But i think it should not be incremented after every send. Or it should?
I don't paste the code because as i said it works OK. I just would like to know what could be wrong from your experience.
The sentence i'm using to write the packets is:
udp.beginPacket(IPAddress([ip address]), [port no]);
The libraries i'm using:
UIPEthernet.h https://github.com/UIPEthernet/UIPEthernet for ENC28J60
Ethernet.h for ethernet shield
EDIT: This is the code of the UDP sender (ENC28J60). Basically is the example code of the library as i said it works correctly in terms of communication. I only changed the IPs: 192.168.1.50 which is the UDP sender and 192.168.1.51 which is the UDP destination.
#include <UIPEthernet.h>
EthernetUDP udp;
unsigned long next;
void setup() {
Serial.begin(115200);
uint8_t mac[6] = {0x00,0x01,0x02,0x03,0x04,0x05};
Ethernet.begin(mac,IPAddress(192,168,1,51));
// Also i used: Ethernet.begin(mac,IPAddress(192,168,1,51), 5000);
// with the same result
next = millis()+2000;
}
void loop() {
int success;
int len = 0;
if (((signed long)(millis()-next))>0)
{
do
{
success = udp.beginPacket(IPAddress(192,168,1,50),5000);
Serial.print("beginPacket: ");
Serial.println(success ? "success" : "failed");
//beginPacket fails if remote ethaddr is unknown. In this case an
//arp-request is send out first and beginPacket succeeds as soon
//the arp-response is received.
}
while (!success && ((signed long)(millis()-next))<0);
if (!success )
goto stop;
success = udp.write("hello world&from&arduino");
Serial.print("bytes written: ");
Serial.println(success);
success = udp.endPacket();
Serial.print("endPacket: ");
Serial.println(success ? "success" : "failed");
do
{
//check for new udp-packet:
success = udp.parsePacket();
}
while (!success && ((signed long)(millis()-next))<0);
if (!success )
goto stop;
Serial.print("received: '");
do
{
int c = udp.read();
Serial.write(c);
len++;
}
while ((success = udp.available())>0);
Serial.print("', ");
Serial.print(len);
Serial.println(" bytes");
//finish reading this packet:
udp.flush();
stop:
udp.stop();
next = millis()+2000;
}
}
EDIT 2: This is a capture of testing with SocketTest listening on port 5000, and after a packet received, the next one arrives with the remote port incremented on 1 each time
You must be creating a new UDP socket per sent datagram. Don't do that. Use the same one for the life of the application.
I have a device that listen to UDP packets on port IN_PORT and echo the message on port OUT_PORT. I can communicate with it using a test software like Packet Sender.
I have to write a C++ library (Win32 at the moment) to communicate with the device. I made several tests but I still wasn't able to communicate. My guess is to use this workflow:
create socket
fill sockaddr_in structure with the device address, AF_INET family and the listeng port (OUT_PORT)
bind the socket
change sockaddr_in.sin_port with IN_PORT and send a packet (using sendto)
wait for an answer (using recvfrom)
repeat from 4
This works if I simulate the device with the Packet Sender utility working locally (device address = 127.0.0.1). I can't use the same workflow to connect to a remote address, even in the same subnet (e.g. my PC address: 192.168.1.2, remote PC address 192.168.1.5), since I get WSAEADDRNOTAVAIL error.
I've tested several different workflows, and read several discussions on the topic here and there, but none works, awfully.
Can someone give me some hints on the subject.
Thanks!
MIX
Your work flow is slightly wrong. It should be more like this instead:
create socket
fill sockaddr_in structure with the address of the local network adapter that is communicating with the device, AF_INET family, and the listenig port (OUT_PORT)
bind the socket
change sockaddr.sin_addr with device address, and sockaddr_in.sin_port with IN_PORT, and send a packet (using sendto)
wait for an answer (using recvfrom)
repeat from 4
I changed my code following Remy Lebeau hints. It works now. If someone will like to have a look and spot some weak points, or suggest improvements, I'll be glad (a code that "just works" is never enough; it must also "shine"!). Comments mark the previous (wrong) version of the code.
#pragma comment (lib, "Ws2_32.lib")
#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include <STRING>
#define IN_PORT 18
#define OUT_PORT 17
#define LOCAL_IP "10.0.10.108"
#define DEVICE_IP "10.0.10.104"
#define DEFAULT_BUFLEN 1024
int main(int argc, char *argv[])
{
WSADATA wsaData;
SOCKET sck;
struct sockaddr_in sckAddrInfo;
bool terminate;
char dataBuffer[DEFAULT_BUFLEN];
int rcvDataLength;
int sckAddrInfoLength;
WSAStartup(MAKEWORD(2,2), &wsaData);
sck = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
memset((&sckAddrInfo), 0, sizeof(sckAddrInfo));
sckAddrInfo.sin_family = AF_INET;
sckAddrInfo.sin_port = htons(IN_PORT);
//sckAddrInfo.sin_addr.s_addr = inet_addr(DEVICE_IP); // WRONG! Must bind local address
sckAddrInfo.sin_addr.s_addr = inet_addr(LOCAL_IP);
bind(sck, (struct sockaddr*)(&sckAddrInfo), sizeof(sckAddrInfo));
terminate = false;
sckAddrInfoLength = sizeof(sckAddrInfo);
while(!terminate)
{
printf("Write echo request: ");
gets(dataBuffer);
sckAddrInfo.sin_addr.s_addr = inet_addr(DEVICE_IP); // Must set device address, too, not just output port
sckAddrInfo.sin_port = htons(OUT_PORT);
sendto(sck, dataBuffer, strlen(dataBuffer), 0, (struct sockaddr*)(&sckAddrInfo), sizeof(sckAddrInfo));
memset(dataBuffer, '\0', DEFAULT_BUFLEN);
rcvDataLength = recvfrom(sck, dataBuffer, DEFAULT_BUFLEN, 0, (struct sockaddr*)(&sckAddrInfo), &sckAddrInfoLength);
printf("Device answer: %s\n", dataBuffer);
if(strcmp(dataBuffer, "quit") == 0)
terminate = true;
}
closesocket(sck);
WSACleanup();
return 0;
}
I am writing a kernel module that should receive messages from user-space and send response back via socket.
When program and module are on the same machine and I use IP 127.0.0.1, everything works fine. But when I try it on different machines and use real network IP, something like 192.168.3.146 it works only in one way.
I receive message from user-space, but I can not receive it from kernel. I use sock_sendmsg function for sending message from kernel and it's not return any error. Also I am not get any messages from firewall that something is came up from another machine, from kernel module.
Here were similar questions and examples, but they were not useful enough for me or examples were used too old kernel version.For skeleton I used this one,from UDP sockets: http://people.ee.ethz.ch/~arkeller/linux/multi/kernel_user_space_howto-3.html. Any help?
Kernel module code for sending:
void send_data(unsigned char *data)
{
if(!IS_ERR_OR_NULL(data))
{
int ret;
mm_segment_t oldfs;
struct msghdr message;
struct iovec ioVector;
struct sockaddr_in sendAddr;
sendAddr.sin_family = AF_INET;
sendAddr.sin_addr.s_addr = INADDR_ANY;
//sendAddr.sin_addr.s_addr = in_aton("192.168.1.75");
//here I get port from sk_buff structure that I received.
sendAddr.sin_port = *((unsigned short*)skBuffer->data);
memset(&message, 0, sizeof(message));
message.msg_name = &sendAddr;
message.msg_namelen = sizeof(sendAddr);
/* send the message back */
ioVector.iov_base = data;
ioVector.iov_len = strlen(data);
message.msg_iov = &ioVector;
message.msg_iovlen = 1;
message.msg_control = NULL;
message.msg_controllen = 0;
oldfs = get_fs();
set_fs(KERNEL_DS);
ret = sock_sendmsg(sendSocket, &message, strlen(data));
set_fs(oldfs);
}
}
I found an alternative solution, using netpoll sockets. It is more easier than sockets, I used before and it works. The answer and proper code is here, on another StackOverflow question.