UART Communication

I attached my code for other people's reference.
I was having trouble with configurations, so anyways thank you for your help.
Regards
Krishnan

You are so kind to share experiences here. Thank you too.

Hi Krishnan Raghavan 

I am trying to do uart communication between two smart RF06 (cc2650) could u please share the working code with me 

Thank You,

There is an UART echo example for CC2640DK under C:\ti\tirtos_simplelink_2_13_00_06\tirtos_simplelink_2_13_00_06_examples\IAR\CC2650DK if you install BLE Stack V2.1.

Hii YK chen

I am working in CCS studio 6.1.2 i will share my code with u now could u please tell me what is the wrong in that code please help me to solve this problem




#include "Board.h"
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/BIOS.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/PIN/PINCC26XX.h>
#include <ti/sysbios/knl/Semaphore.h>
#include <ti/drivers/UART.h>
#include <xdc/runtime/System.h>
#include "delay.h"
#include "string.h"
static PIN_Handle pinHandle;
static PIN_State ModbusState;

#define TASK_STACK_SIZE 512
#define TASK_PRI 1

char taskStack[TASK_STACK_SIZE];
Task_Struct taskStruct;

void taskFxn(UArg a0, UArg a1);


#define BUFTYPE char
#define PBUFTYPE char*
#define BUFSIZE 15

UART_Handle hUART;

BUFTYPE txBuf[] = "AT\r";
BUFTYPE rxBuf[2];

UART_Params params;

Semaphore_Struct sem;
Semaphore_Handle hSem;

static void uartRxCb(UART_Handle handle, void *buf, size_t count)
{
Semaphore_post(hSem);
}

void taskFxn(UArg a0, UArg a1)
{
pinHandle = PIN_open(&ModbusState, BoardGpioInitTable);
PIN_setOutputValue(pinHandle, PIN_ID(Board_UART_RX), 1);
PIN_setOutputValue(pinHandle, PIN_ID(Board_UART_TX), 1);


UART_Params_init(&params);
params.readMode = UART_MODE_CALLBACK;
params.writeMode = UART_MODE_BLOCKING;
params.readCallback = uartRxCb;
params.readEcho = UART_ECHO_OFF;
params.dataLength = UART_LEN_8;
params.stopBits = UART_STOP_ONE;
params.baudRate = 115200;

hUART = UART_open(CC2650_UART0, &params);

Semaphore_Params sParams;
Semaphore_Params_init(&sParams);
sParams.mode = Semaphore_Mode_BINARY;

Semaphore_construct(&sem, 0, &sParams);
hSem = Semaphore_handle(&sem);

PIN_close(pinHandle);

UART_write(hUART, txBuf, sizeof(txBuf));

UART_read(hUART, &rxBuf, sizeof(rxBuf));
Semaphore_pend(hSem, BIOS_WAIT_FOREVER);

if((strstr(rxBuf,"OK")) || (strstr(rxBuf,"ok")))
{
System_printf("AT : OK");
}
else
{
System_printf("Error...");
}
}



int main(void)
{

PIN_init(BoardGpioInitTable);

Task_Params params;
Task_Params_init(&params);
params.priority = TASK_PRI;
params.stackSize = TASK_STACK_SIZE;
params.stack = taskStack;

Task_construct(&taskStruct, taskFxn, &params, NULL);

BIOS_start();
}

Thank You,

What is your problem?

See am using 2 smartRF06 EVB boards to communicate through UART so i wrote that code where am transmitting AT to the other device but am not able to receive anything from the UART is that code is right or do i need to modify anything

You should do UART read in RX callback function "uartRxCb".

Thnak you so much will try this now and let me know if any other changes to be made thank u once again

You are welcome.

Hii YiKai Chen

I have done all the changes that u have asked me to do but its not working moreover its not going inside the uartRxCb loop what to do now ?

If you run default uartecho example and only remove UART_write in the while loop, can it receive UART data?

    /* Loop forever echoing */
    while (1) {
        UART_read(uart, &input, 1);
        //UART_write(uart, &input, 1);
    }

Hello Yikai 

Can u please send me the uart echo example code bec am new to this CCS so could u please send me the echo example code 

And if u have the working code which communicates 2 SmartRf06 through UART please send me

If you already install BLE Stack 2.1, you can find uartecho example under C:\ti\tirtos_simplelink_2_13_00_06\tirtos_simplelink_2_13_00_06_examples\TI\CC2650DK\uartecho

Yeah I got it thank u will try now and will let u know

You are welcome.

hello Yikai

Since I am using SmartRf 06 (cc2650) i need to select CC2640F128 but after i select this its giving error

You don't have to change it.

But while uploading the code its giving error and for echo my hardware connections r like this i have connected TX of the board to the RX of the same board. is this connection is right for echo ?

Hii I tried that commenting UART_write (uart,&input,1) still am unable to receive data and my hardware connections r like this i have connected TX to RX of the same board will it work

What do you mean "its giving error"? uartecho example will echo what you input to UART so it looks like RX is connected to TX.

Yeah i have connected RX to TX shall i remove tat connection and try ???

Yes, you should remove connection between RX and TX.

den How will i getta know that UART pin TX is Transmitting and RX is receiving ??

Open a UART terminal tool and type some character there. If you see what you type into the terminal, it means the uartecho works.

Yeah i can able to see what ever i type on the terminal den is it working ??? if so then yy its not working when i connect UART pins to other MCU what do i need to change in this example code

Is the baudrate setting 9600 on another board?

the boards am using are same both r SmartRf06 (CC2650) both r having same baurdrate

It supports flexible baudrate
generation up to a maximum of 3 Mbps (115200) this baud rate i am using is it fine >?

What do you mean flexible baudrate? If you use CC2650, you have to set baudrate.

ooooo den wats the baud rate do i need to set

If the baudrate of sender is set to 115200, the baudrate of receiver should be the same.

Yeah am trying with the same baud rate but still not able to receive any data and my hardware connections are like this I have connected TX and RX and GND with other cc2650 by connecting TX to RX and RX to TX and GND to GND.

Can you take a picture to show me how you connect two CC2650DK?

and let me know if u want me to change anything in the code

thank u

I suggest you give power from USB cable for both of your CC2560DK.

Yeah I have given but while taking photo i didnt give, when i do debugg and when i check my rxBuf it will be empty

uart_write (huart, txBuf, 15);
uart_read(huart,&rxBuf,15);

where txBuf[] = "message sent"

I can receive that "message sent" on the uart terminal but its not transmitting to rxBuf

Do you run UARTecho example on both your CC2650DK?

Yeah i have run on both and yeah both r working fine in echo but y am i not able to transfer data from UART TX to other UART RX please help me in this

please send the working code if u have it

I use UARTecho example but I don't connect two CC2650DK. I see no reason why it doesn't work. Do you use oscilloscope to check I'd there's TX/RX signals running?

yeah i will check it by connecting to CRO and check

CRO?

cathode-ray oscilloscope I told

OK, that is oscilloscope.