Part Number: TMS320F2812
I am using a F2812 based development board. One of my project goal is to send the ADC value to an android app via bluetooth. I am using a HC-05 bluetooth module and a 5 Volt is being applied to this module from a different 5V source. Following is the code for sending the any value via bluetooth.
#include "DSP281x_Device.h" // DSP281x Headerfile Include File
#include "DSP281x_Examples.h" // DSP281x Examples Include File
#include<stdio.h>
#include<math.h>
#include <stdlib.h>
// Prototype statements for functions found within this file.
void scia_echoback_init(void);
void scia_fifo_init(void);
void scia_xmit(char a);
void scia_msg(char *msg);
void ftoa(float n, char *res, int afterpoint);
int intToStr(int x, char str[], int d);
void reverse(char *str, int len);
// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;
void main(void)
{
//Uint16 ReceivedChar;
char *msg;
char res[20];
// float n = 9.1;
//float m = 2.5;
float q = 2.51;
//char array[10];
//sprintf(array, "%d", 311);
ftoa(q,res,2); // Convert the float value into a string
InitSysCtrl();
EALLOW;
GpioMuxRegs.GPFMUX.all=0x0030; // Select GPIOs to be Scia pins
// Port F MUX - x000 0000 0011 0000
//GpioMuxRegs.GPGMUX.all=0x0030; // Select GPIOs to be Scib pins
// Port G MUX - x000 0000 0011 0000
EDIS;
DINT;
InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
LoopCount = 0;
ErrorCount = 0;
scia_fifo_init(); // Initialize the SCI FIFO
scia_echoback_init(); // Initalize SCI for echoback
for(;;)
{
msg ='\r'+'\n'+'\n'+res+'\0';
scia_msg(msg);
LoopCount++;
}
void scia_echoback_init()
{
// Note: Clocks were turned on to the SCIA peripheral
// in the InitSysCtrl() function
SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
SciaRegs.SCICCR.bit.LOOPBKENA =0;
// async mode, idle-line protocol
SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
SciaRegs.SCICTL2.all =0x0003;
SciaRegs.SCICTL2.bit.TXINTENA =1;
SciaRegs.SCICTL2.bit.RXBKINTENA =1;
SciaRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 37.5MHz.
SciaRegs.SCILBAUD =0x00E7;
SciaRegs.SCICCR.bit.LOOPBKENA =0; // Enable loop back
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
// Transmit a character from the SCI
void scia_xmit(char a)
{
while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
SciaRegs.SCITXBUF=a;
}
void scia_msg(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
scia_xmit(msg[i]);
i++;
}
}
// Initalize the SCI FIFO
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all=0xE040;
SciaRegs.SCIFFRX.all=0x204f;
SciaRegs.SCIFFCT.all=0x0;
}
// reverses a string 'str' of length 'len'
void reverse(char *str, int len)
{
int i=0, j=len-1, temp;
while (i<j)
{
temp = str[i];
str[i] = str[j];
str[j] = temp;
i++; j--;
}
}
// Converts a given integer x to string str[]. d is the number
// of digits required in output. If d is more than the number
// of digits in x, then 0s are added at the beginning.
int intToStr(int x, char str[], int d)
{
int i = 0;
while (x)
{
str[i++] = (x%10) + '0';
x = x/10;
}
// If number of digits required is more, then
// add 0s at the beginning
while (i < d)
str[i++] = '0';
reverse(str, i);
str[i] = '\0';
return i;
}
// Converts a floating point number to string.
void ftoa(float n, char *res, int afterpoint)
{
// Extract integer part
int ipart = (int)n;
// Extract floating part
float fpart = n - (float)ipart;
// convert integer part to string
int i = intToStr(ipart, res, 0);
// check for display option after point
if (afterpoint != 0)
{
res[i] = '.'; // add dot
// Get the value of fraction part upto given no.
// of points after dot. The third parameter is needed
// to handle cases like 233.007
fpart = fpart * pow(10, afterpoint);
intToStr((int)fpart, res + i + 1, afterpoint);
}
}
Now when i am trying to send the data via bluetooth then i am getting some garbage data ( please see the attached file). Am i doing something wrong in the code? what to do to receive the actual data?
