I'd like to make a PPG&GSR signal waveform mornitoring system by MSP430&Android.
My system is simply ADC12(12bit) -> NumToString(for 1signal(2chanel)12Char=12byte=96bit) -> UART(8bit, 119200bps) -> Bluetooth(8bit, 1~3MB/s) -> Android
But I just get 50~60sample per second(I need 200~300sample per second). I guess my problem is in Timer or Main Clock or UART.
My question is...
1. When I changed Timer clock register(TA1CCR0), nothing changed(I still got same sample per second)
2. My freind uses NumToBinary algorithm and get around 250 sample per sec, I know it is more effiecient than my way. But I don't know why even I chaned up UART speed it doesnt works. I messured this. UART speed is 119200bps=14.4kB/s and 1 signal(12char=12byte). So, 14400/12=1200 sample per sec. am I wrong?
I don't know exactly know what is the problem and looking forward to your help
thanks indeed.
I attach my main code
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void main(void) {
WDTCTL = WDTPW + WDTHOLD; // Stop watch dog timer
//Initialize LCD
halLcdInit();
halLcdBackLightInit();
halLcdSetBackLight(0);
halLcdSetContrast(100);
halLcdClearScreen();
__bis_SR_register(SCG0); // Disable the FLL control loop
UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx
UCSCTL1 = DCORSEL_7; // Select DCO range 16MHz operation
UCSCTL2 = FLLD_1 + 249; // Set DCO Multiplier for 8MHz
// (N + 1) * FLLRef = Fdco
// (249 + 1) * 32768 = 8MHz
// Set FLL Div = fDCOCLK/2
__bic_SR_register(SCG0); // Enable the FLL control loop
//Initialize ADC12_A
P7SEL |= 0x50; // Enable A/D channel Port7.4, 7.6 (A12, A14)
ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT1_0;// Turn on ADC12, set sampling time , ADC12CLK Cycle 4
ADC12CTL1 = ADC12SHP+ADC12CONSEQ_3+ADC12DIV_0; // Use sampling timer, Repeat-sequence-of-channels
//ADC12CTL2 = ADC12RES_3;
ADC12MCTL9 = ADC12INCH_12;// ref+=AVcc, channel = A12, ADC_12A Memory Control 9
ADC12MCTL11 = ADC12INCH_14+ADC12EOS;// ref+=AVcc, channel = A14, ADC_12A Memory Control 11
ADC12IE = 0xF080; //Enable ADC12IFG7, ADC12IFG15
ADC12CTL0 |= ADC12ENC; // Enable conversions
//Initialize UART
P3SEL = 0x30; //Port3.4, 3.5
UCA0CTL1 |= UCSWRST; // **Put state machine in reset**
UCA0CTL1 |= UCSSEL_2; // CLK = SMCLK 8Mhz
UCA0BR0 = 4; // 8MHz/9600=69.44 (see User's Guide)
UCA0BR1 = 0x00; // 32.3.13 Typical Baud Rates and Errors
UCA0MCTL = UCBRS_5+UCBRF_3+UCOS16; // Modulation UCBRSx=5, UCBRFx=3, Oversamping ON
UCA0CTL1 &= ~UCSWRST;
UCA1IE |= UCRXIE;
//Initialize Timer
TA1CCTL0 = CCIE; // CCR0 interrupt enabled
TA1CCR0 = 8333; // 8MHz/8333ms divide =
TA1CTL = TASSEL_2 + MC_1; // SMCLK 1MHz, Continuous mode, clear TAR
__enable_interrupt();
while(1);
}
// Timer A0 interrupt service routine
#pragma vector=TIMER1_A0_VECTOR
__interrupt void TIMER1_A(void)
{
while(1){
ADC12CTL0 |= ADC12SC; // Start conversion
__bis_SR_register(LPM0_bits+GIE);
}
}
// ADC12 interrupt service routine
#pragma vector=ADC12_VECTOR
__interrupt void ADC12_ISR(void){
readADC();
}
void readADC(){
sum_data[0] = (unsigned int)ADC12MEM9; // Move sum_data[0], IFG is cleared p.7.4
sum_data[1] = (unsigned int)ADC12MEM11; // Move sum_data[1], IFG is cleared p.7.5
numtostring(sum_data[0],sum_data[1]);
}
void numtostring(long num, long num2){
char str[12] = {' '};
int tmp;
int i = 0;
int j,k,l;
while(num!=0){
for(j=i; j>0; j--){
*(str+j) = *(str+j-1);
}
tmp = num%10;
if(tmp==0)
*str='0';
else if(tmp==1)
*str='1';
else if(tmp==2)
*str='2';
else if(tmp==3)
*str='3';
else if(tmp==4)
*str='4';
else if(tmp==5)
*str='5';
else if(tmp==6)
*str='6';
else if(tmp==7)
*str='7';
else if(tmp==8)
*str='8';
else if(tmp==9)
*str='9';
num = num / 10;
i++;
}
str[i++]='A';
str[i++]='/';
k=i;
halLcdPrintLineCol("PPG", 3, 1, OVERWRITE_TEXT);
halLcdPrintLineCol(str, 3, 7, OVERWRITE_TEXT);
while(num2!=0){
for(j=i; j>k; j--){
*(str+j) = *(str+j-1);
}
tmp = num2%10;
if(tmp==0)
*(str+k)='0';
else if(tmp==1)
*(str+k)='1';
else if(tmp==2)
*(str+k)='2';
else if(tmp==3)
*(str+k)='3';
else if(tmp==4)
*(str+k)='4';
else if(tmp==5)
*(str+k)='5';
else if(tmp==6)
*(str+k)='6';
else if(tmp==7)
*(str+k)='7';
else if(tmp==8)
*(str+k)='8';
else if(tmp==9)
*(str+k)='9';
num2 = num2 / 10;
i++;
}
str[i++]='B';
str[i++]='/';
halLcdPrintLineCol("GSR", 5, 1, OVERWRITE_TEXT);
halLcdPrintLineCol(str+k, 5, 7, OVERWRITE_TEXT);
for(j=0;j<i; j++){
while (!(UCA0IFG&UCTXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = str[j];
}
}
