Texas Instrument CC1350 UART for RSSI signal strength

[imfromsa]

Hi,

i currently have an UARTecho that is working and the current code is as follows

else if(e & RF_EventRxEntryDone)
{
/* Successful RX */
bRxSuccess = true;

/* Get current unhandled data entry */
currentDataEntry = RFQueue_getDataEntry();
RSSIout = rxStatistics.lastRssi;

/* Handle the packet data, located at &(currentDataEntry->data):
* - Length is the first byte with the current configuration
* - Data starts from the second byte
*/
packetLength = *(uint8_t *)(&(currentDataEntry->data));
packetDataPointer = (uint8_t *)(&(currentDataEntry->data) + 1);

/* Copy the payload + status byte to the rxPacket variable */
memcpy(rxPacket, packetDataPointer, (packetLength + 1));

/* Check the packet against what was transmitted */
int16_t status = memcmp(returnCheck, rxPacket, checkLength);

if(status == 0)
{
/* Toggle LED1, clear LED2 to indicate RX */
PIN_setOutputValue(ledPinHandle, Board_PIN_LED1,
!PIN_getOutputValue(Board_PIN_LED1));
PIN_setOutputValue(ledPinHandle, Board_PIN_LED2, 0);

UART_write(uart, &rxPacket, sizeof(rxPacket));
UART_write(uart, " ", 1);
}

However i want to additionally print the RSSI value of the packet i receive,

I have tried including the line UART_write(uart, &RSSIout, sizeof(RSSIout) below my existing UART_write lines

However it causes my TX and RX to stop transmitting after a few seconds

Anyone knows how to fix this?

[salem c]

> I have tried including the line UART_write(uart, &RSSIout, sizeof(RSSIout)
> below my existing UART_write lines
That seemed a reasonable thing to try.

> However it causes my TX and RX to stop transmitting after a few seconds
Does the thing at the other end understand that you're now sending RSSI information?

In particular, is rxPacket entirely printable characters, and is RSSIout something like a raw integer?

At lot of things complain if you send arbitrary binary data over a UART.

[imfromsa]

RSSIout is a 8 bit integer value! is there anyway to send a 8 bit sign integer over uart? and is it possible to send two bundles of data (the packet information and the RSSI signal strength) through Uart?

[salem c]

Try sending it as a formatted string, not a raw integer.

[imfromsa]

Hi salem thank you so much for the help so far, as i am really new to C++ how would i send the UART as a string?

Which part or UART_write(uart, &RSSIout, sizeof(RSSIout) would i need to change

[salem c]

I'm going to go with C, which is what your code looks like, and is far more likely to be what you're using on small devices without operating systems.

char buff[10];
snprintf(buff,sizeof(buff),"%d ",RSSIout);
UART_write(uart, buff, strlen(buff));

If you don't have snprintf.

char buff[10];  // take a chance that 10 is always enough
sprintf(buff,"%d ",RSSIout);
UART_write(uart, buff, strlen(buff));

If you have no formatted printing, build your own.

const char *lut = "0123456789abcdef";
char buff[4] = ".. ";
buff[0] = lut[ (unsigned)(RSSIout >> 4) & 0xf ];
buff[1] = lut[ (unsigned)(RSSIout >> 0) & 0xf ];  // yes, >>0 is a no-op, it's pretty though
UART_write(uart, buff, strlen(buff));

Yes, this sends it in hex rather than decimal.
If you want decimal, and this is your only option, consider it an easy exercise.

[imfromsa]

It works!!!!! thank you so much salem! hope you have a great day ahead!

[imfromsa]

Hi salem sorry to trouble again. now that i have the RSSI value, is it possible to UART_write 2 different information? i am now unable to

char buff[10]; // take a chance that 10 is always enough
sprintf(buff,"%d ",RSSIout);
UART_write(uart, buff, strlen(buff));
UART_write(uart, &Rxpacket, sizeof(rxpacket);

the display only shows

char buff[10]; // take a chance that 10 is always enough
sprintf(buff,"%d ",RSSIout);
UART_write(uart, buff, strlen(buff));

is it possible to display both of this information in the same line?

[salem c]

I've no idea about the mysteries of your 'display', or what might be in your Rxpacket .