Hi
I'm modifying EZ430-RF2569 accelerometer application. I have modified sdk_spp_data_read:
void sdk_spp_data_read(UCHAR * buffer, UINT16 buf_len)
{
float rez;
char temp[6];
int buf;
rez = -1;
#ifdef EZ430_PLATFORM
UART_DISABLE_BT_UART_RTS();
rez = izmjeri_koncentraciju(76, 85, 312000, 51);
buf = (int) rez;
if (buf<0) buf = 0;
temp[2] = buf / 1000 + 48;
temp[3] = (buf / 100) % 10 + 48;
temp[4] = (buf / 10) % 10 + 48;
temp[5] = buf % 10 + 48;
temp[0] = 'c';
temp[1] = '=';
UART_ENABLE_BT_UART_RTS();
#else /* MSP-EXP430F5438 Platform */
/* start the ADC to read the accelerometer output */
//halAdcStartRead();
/* read the digital accelerometer x- direction and y - direction output */
//halAccelerometerRead((int *)&accl_x, (int *)&accl_y);
#endif
/* Pack the x and y co-ordinate values in to buffer */
buffer[0] = temp[0];
buffer[1] = temp[1];
buffer[2] = temp[2];
buffer[3] = temp[3];
buffer[4] = temp[4];
buffer[5] = temp[5];
}
and code for izmjeri_koncentraciju is :
float izmjeri_koncentraciju (unsigned int PHtip, unsigned int PHmax, float RL, short select)
{
unsigned int Uref, US, i, d;
float RS, PH, UH;
WDTCTL = WDTPW + WDTHOLD;
//set outputs low
P8OUT &= ~BIT6;
P4OUT &= ~BIT2;
P4OUT &= ~BIT0;
P8OUT &= ~BIT4;
// set output depending on select
if (select == 26) //log1
{
P8DIR |= BIT6;
P8OUT |= BIT6;
}
else if (select == 27) //log2
{
P4DIR |= BIT2;
P4OUT |= BIT2;
}
else if (select == 51) //log3
{
P4DIR |= BIT0;
P4OUT |= BIT0;
}
else if (select == 55) //log4
{
P8DIR |= BIT4;
P8OUT |= BIT4;
}
else
return -1;
// PWM on pin P8.2
P8DIR |= BIT2; // P8.2 output
P8SEL |= BIT2; // P8.2 options select
TA0CCR0 = 200 ; // PWM Period, f = 5 kHz
TA0CCTL2 = OUTMOD_7; // CCR2 reset/set
TA0CCR2 = 100; // CCR2 PWM duty cycle, pocinje sa 70% max outputa
TA0CTL = TASSEL_2 + MC_1 + TACLR; // SMCLK, up mode, clear TAR
//ADC
REFCTL0 &= ~REFMSTR; // no ADC ref
REFCTL0 &= ~REFON; // shutdown ref
P7SEL |= BIT4; // P7.4 ADC option select
ADC12CTL0 = ADC12ON + 0xB000; // ADC ON, 768 cycles
ADC12CTL1 = ADC12SHP + 0xC000; // SHP, A12
ADC12CTL2 = ADC12RES_2; // 12 bit resolution
ADC12MCTL12 = ADC12INCH_12 + ADC12SREF_0; // A12 to memory register 12, VCC ref
// for cca. 5 seconds regulate PH
for(i=0; i<455; i++)
{
ADC12IFG = 0; /* Clear any pending flags */
ADC12CTL0 |= ADC12ENC; // enable
ADC12IE = 0x1000;
ADC12CTL0 |= ADC12SC; // start
__delay_cycles(1000); //delay 0.001 s
d = TA0CCR2;
UH = ADC12MEM12 / 4095 * 3;
PH = (float)d /1000 /4.99 * (UH - d);
// PH is dependent on PWM duty cycle
// P regulator, if PH is to small, increase duty cycle of PWM, if to big, decrease duty cycle
if (PH < 0.95 * PHmax && TA0CCR2 < 200)
TA0CCR2++;
if (PH > 0.95 * PHmax && TA0CCR2 > 0)
TA0CCR2--;
__delay_cycles(9000); //delay 0.009 s
}
// set output
P4DIR |= BIT6;
P4OUT |= BIT6;
TA0CCR2 = 100; // set duty on 50%
// for cca. 9 seconds regulate PH
for(i=0; i<865; i++)
{
ADC12IFG = 0; /* Clear any pending flags */
ADC12CTL0 |= ADC12ENC; // enable
ADC12IE = 0x1000;
ADC12CTL0 |= ADC12SC; // start
__delay_cycles(1000); //delay 0.001 s
d = TA0CCR2;
UH = ADC12MEM12 / 4095 * 3;
PH = (float)d /1000 /4.99 * (UH - d); //PH u mW
// P regulator
if (PH < PHtip && TA0CCR2 < 200)
TA0CCR2++;
if (PH > PHtip && TA0CCR2 > 0)
TA0CCR2--;
__delay_cycles(9000); //delay 0.009 s
}
// ADC sequence, channel A13 and A14
ADC12CTL0 = 0;
REFCTL0 |= REFMSTR + REFTCOFF + REFON; // turn on ref for ADC
REFCTL0 &= ~0x0030; // ref = 1.5 V
P7SEL = BIT5 + BIT6; // P7.5 i P7.6 ADC option select
ADC12CTL0 = ADC12ON + 0xB000 + ADC12MSC; // ON, cycles, sequence
ADC12CTL1 = ADC12SHP + ADC12CONSEQ_1 + 0xD000; // s&h, sequence once, A13 first signal
ADC12CTL2 = ADC12RES_2;
ADC12MCTL13 = ADC12INCH_13 + ADC12SREF_1; //A13 to MEM13, ref 1,5 V
ADC12MCTL14 = ADC12INCH_14 + ADC12EOS + ADC12SREF_1; //A14 to MEM14, end of sequence, ref 1,5 V
ADC12IFG = 0; /* Clear any pending flags */
ADC12CTL0 |= ADC12ENC; // enable conversion
ADC12IE = 0x4000; // enable interrupt
ADC12CTL0 |= ADC12SC; // start
__delay_cycles(50000); //delay 0.05 s
Uref = ADC12MEM13; //
US = ADC12MEM14; //
REFCTL0 &= ~REFMSTR; // disable ref
REFCTL0 &= ~REFON; // shutdown ref
RS = ( (float) US/Uref - 1) * RL; //calculate RS
// set output low
P4OUT &= ~BIT6;
ADC12CTL0=0; // turn off ADC
TA0CTL = MC_0 + TACLR; // Stop PWM counter, clear TAR
//set outputs low
P8OUT &= ~BIT6;
P4OUT &= ~BIT2;
P4OUT &= ~BIT0;
P8OUT &= ~BIT4;
return RS;
}
I also modified the code so the data is send via Bluetooth only by pressing on switch 2. I've done that by commenting all calls of appl_send_spp_data and adding the same line in switch 2 case.
What I am trying to do is that switch 2 triggers appl_send_spp_data, which ultimately starts izmjeri_koncentraciju. However, it seems that Izmjeri_koncentraciju is never started or is started but is shortly terminated after.
Function should make AD conversions for first 5 seconds and regulate output with regard to result of AD conversion. Then it does the same thing for next cca. 9 seconds. After that it should make a sequence AD conversion and calculate the result, which is to be send via Bluetooth.
I would appreciate any suggestions on how to effectively incorporate this function in accelerometer application.
I've tried replacing izmjeri_koncentraciju code with simple AD conversion and sending result over Bluetooth. This works.
At the moment, I'm using switch 2 as trigger, but my final version should start appl_send_spp_data when a special command is received via Bluetooth.
Regards,
bj
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