how to send a negative number using SimpliciTI?

It is all a matter of formatting. If you need to send anything bigger than a 8 bit value, just define consecutive bytes as a word or longword, etc. For signed vs unsigned you would just need to cast the variable properly. A signed variable is just an unsigned with the MSB as the sign bit.

Hi, thanks for the reply!

I tried to cast the ADCH before sending it over the radio, using the following code,

uint8_t uADCH = (uint8_t) ADCH;

SMPL_Send (linkID, &uADCH, 1);

But did not seem to work.

I tried the following way, y = static_cast<unsigned char>(x), IAR does not support static_cast.

So how to cast it properly? Thanks!

Basically you have to do some bit manipulation to fit larger variable sizes into the 8 bit char values sent by SimpliciTI.See my example in this topic. :

http://e2e.ti.com/support/low_power_rf/f/155/t/235885.aspx

The following code is type agnostic, just put whatever data type in the structure you need. Memcpy transfers the data from type to char and back again.

VARIABLES:

typedef struct {
int Sample1;
int Sample2;
} ADC;

MyData ADC;
MsgBuf[Len] = {0}

SENDER
memcpy( MsgBuf, (char *)&ADC, sizeof(ADC));
SMPL_Send (linkID, MsgBuf, sizeof(ADC));

RECEIVER
int Len;
SMPL_Receive(LinkID, MsgBuf, &Len);
memcpy((char *)&ADC, MsgBuf, sizeof(ADC));