CCS/MSP430FR2311: Capacitive touch

Aref Smiley

Part Number: MSP430FR2311
Other Parts Discussed in Thread: MSP430FR2532, MSP430FR2522, MSP430FR2512

Tool/software: Code Composer Studio

Hi,

I am new to msp430 family. For my project, I do need to use one of the families of ultra-low-power-microcontrollers. I have a developement board of MSP430FR2311.

I want to use couple of pins as the Capacitive Proximity Detection and/or Capacitive touch sensing. In the Device Overview of the Data sheet, it is mentioned that "all I/Os are Capacitive touch I/Os". Is there any libraries or example codes I can use?

Thanks

over 8 years ago

0 Ling Zhu2 over 8 years ago

TI__Genius 9570 points

Hi,

We recommend CapTIvate device for cap-touch applications. CapTIvate is new touch technology from TIwhich provides higher performance and lower power.

If you still would like to use FR2311. Please find code examples attached.

Fullscreen msp430fr231x_pinosc_02.c Download

/* --COPYRIGHT--,BSD_EX
 * Copyright (c) 2014, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *******************************************************************************
 * 
 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//  MSP430FR231x Demo - Capacitive Touch, Pin Oscillator Method, 4-buttons
//
//  Description: Basic 4-button input using the built-in pin oscillation feature
//  on GPIO input structure. PinOsc signal feed into TB0CLK. WDT interval is used
//  to gate the measurements. Difference in measurements indicate button touch.
//  LED flash if input is touched.
//
//  Input 1: LED1 (LED2 off)
//  Input 2: LED2 (LED1 off)
//  Input 3: Both LEDs on
//  Input 4: Both LEDs flash on/off
//
//  ACLK = VLO = 32kHz, MCLK = SMCLK = 1MHz DCO
//
//               MSP430FR2311
//             -----------------
//         /|\|              XIN|-
//          | |                 | 
//          --|RST          XOUT|-
//            |                 |
//            |             P2.2|<--Capacitive Touch Input 1
//            |                 |
//  LED 2  <--|P1.1         P2.3|<--Capacitive Touch Input 2
//            |                 |
//  LED 1  <--|P1.0         P2.4|<--Capacitive Touch Input 3
//            |                 |
//            |             P2.5|<--Capacitive Touch Input 4
//
//   Darren Lu
//   Texas Instruments Inc.
//   Oct. 2015
//   Built with IAR Embedded Workbench v6.30 & Code Composer Studio v6.1
//******************************************************************************

#include <msp430.h>
/* Define User Configuration values */
/*----------------------------------*/
/* Defines WDT SMCLK interval for sensor measurements*/
#define WDT_meas_setting (DIV_SMCLK_512)
/* Defines WDT ACLK interval for delay between measurement cycles*/
#define WDT_delay_setting (DIV_ACLK_512)

/* Sensor settings*/
#define NUM_SEN     4                       // Defines number of sensors
#define KEY_LVL     220                     // Defines threshold for a key press
/*Set to ~ half the max delta expected*/

/* Definitions for use with the WDT settings*/
#define DIV_ACLK_32768  (WDT_ADLY_1000)     // ACLK/32768
#define DIV_ACLK_8192   (WDT_ADLY_250)      // ACLK/8192 
#define DIV_ACLK_512    (WDT_ADLY_16)       // ACLK/512 
#define DIV_ACLK_64     (WDT_ADLY_1_9)      // ACLK/64 
#define DIV_SMCLK_32768 (WDT_MDLY_32)       // SMCLK/32768
#define DIV_SMCLK_8192  (WDT_MDLY_8)        // SMCLK/8192 
#define DIV_SMCLK_512   (WDT_MDLY_0_5)      // SMCLK/512 
#define DIV_SMCLK_64    (WDT_MDLY_0_064)    // SMCLK/64 

#define LED_1   (BIT0)                      // P1.0 LED output
#define LED_2   (BIT1)                      // P1.1 LED output

// Global variables for sensing
unsigned int base_cnt[NUM_SEN];
unsigned int meas_cnt[NUM_SEN];
int delta_cnt[NUM_SEN];
unsigned char key_press[NUM_SEN];
char key_pressed;
const unsigned char electrode_bit[NUM_SEN]={BIT2, BIT3, BIT4, BIT5};
/* System Routines*/
void measure_count(void);                   // Measures each capacitive sensor
void pulse_LED(void);                       // LED gradient routine
void pinosc_channel_select(unsigned char PORT, unsigned char PIN);

int main( void )
{
    unsigned int i,j;
    WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;

    SFRIE1 |= WDTIE;                          // enable WDT interrupt
    P1DIR |= LED_1 + LED_2;                    // P1.0 & P1.1 = LEDs
    P1OUT &= ~(LED_1 + LED_2);

    __bis_SR_register(GIE);                   // Enable interrupts        

    measure_count();                          // Establish baseline capacitance
    for (i = 0; i<NUM_SEN; i++)
        base_cnt[i] = meas_cnt[i];
    
    for(i=15; i>0; i--)                       // Repeat and avg base measurement
    { 
        measure_count();
        for (j = 0; j<NUM_SEN; j++)
            base_cnt[j] = (meas_cnt[j]+base_cnt[j])/2;
    }
    
    /* Main loop starts here*/
    while (1)
    {
        j = KEY_LVL;
        key_pressed = 0;                        // Assume no keys are pressed
        
        measure_count();                        // Measure all sensors
        
        for (i = 0; i<NUM_SEN; i++)
        { 
            delta_cnt[i] = base_cnt[i] - meas_cnt[i];  // Calculate delta: c_change
            
            /* Handle baseline measurment for a base C decrease*/
            if (delta_cnt[i] < 0)                 // If negative: result increased
            {                                     // beyond baseline, i.e. cap dec
                base_cnt[i] = (base_cnt[i]+meas_cnt[i]) >> 1; // Re-average quickly
                delta_cnt[i] = 0;                 // Zero out for pos determination
            }
            if (delta_cnt[i] > j)                 // Determine if each key is pressed 
            {                                     // per a preset threshold
                key_press[i] = 1;                   // Specific key pressed
                j = delta_cnt[i];
                key_pressed = i+1;                  // key pressed
            }
            else
                key_press[i] = 0;
        }
        
        /* Delay to next sample */
        WDTCTL = WDT_delay_setting;             // WDT, ACLK, interval timer
        
        /* Handle baseline measurment for a base C increase*/
        if (!key_pressed)                       // Only adjust baseline down 
        {                                       // if no keys are touched
            for (i = 0; i<NUM_SEN; i++)
                base_cnt[i] = base_cnt[i] - 1;      // Adjust baseline down, should be 
        }                                       // slow to accomodate for genuine 
        pulse_LED();                           // changes in sensor C
        
        __bis_SR_register(LPM3_bits);
    }
}                                           // End Main

/* Measure count result (capacitance) of each sensor*/
/* Routine setup for four sensors, not dependent on NUM_SEN value!*/

void measure_count(void)
{ 
    unsigned char i;
    TB0CTL = TBSSEL_3 + MC_2;                   // INCLK, cont mode
    TB0CCTL1 = CM_3 + CCIS_2 + CAP;             // Pos&Neg,GND,Cap

    for (i = 0; i<NUM_SEN; i++)
    {
        /*Configure Ports for relaxation oscillator*/
        pinosc_channel_select(2, electrode_bit[i]);
        
        /*Setup Gate Timer*/
        WDTCTL = WDT_meas_setting;              // WDT, ACLK, interval timer
        TB0CTL |= TBCLR;                        // Clear Timer_B TBR
        __bis_SR_register(LPM0_bits+GIE);       // Wait for WDT interrupt
        TB0CCTL1 ^= CCIS0;                      // Create SW capture of CCR1
        meas_cnt[i] = TB0CCR1;                  // Save result
        WDTCTL = WDTPW + WDTHOLD;               // Stop watchdog timer
        CAPTIOCTL = 0;
    }
}

void pinosc_channel_select(unsigned char PORT, unsigned char PIN)
{
    CAPTIOCTL = 0;
    switch(PORT)
    {
    case 1: CAPTIOCTL |= CAPTIOPOSEL0; break;
    case 2: CAPTIOCTL |= CAPTIOPOSEL1; break;
    case 3: CAPTIOCTL |= CAPTIOPOSEL0 + CAPTIOPOSEL1; break;
    case 4: CAPTIOCTL |= CAPTIOPOSEL2; break;
    case 5: CAPTIOCTL |= CAPTIOPOSEL0 + CAPTIOPOSEL2; break;
    case 6: CAPTIOCTL |= CAPTIOPOSEL1 + CAPTIOPOSEL2; break;
    case 7: CAPTIOCTL |= CAPTIOPOSEL0 + CAPTIOPOSEL1 + CAPTIOPOSEL2; break;
    case 8: CAPTIOCTL |= CAPTIOPOSEL3; break;
    case 9: CAPTIOCTL |= CAPTIOPOSEL0 + CAPTIOPOSEL3; break;
    case 10: CAPTIOCTL |= CAPTIOPOSEL1 + CAPTIOPOSEL3; break;
    case 11: CAPTIOCTL |= CAPTIOPOSEL0 + CAPTIOPOSEL1 + CAPTIOPOSEL3; break;
    case 12: CAPTIOCTL |= CAPTIOPOSEL2 + CAPTIOPOSEL3; break;
    case 13: CAPTIOCTL |= CAPTIOPOSEL0 + CAPTIOPOSEL2 + CAPTIOPOSEL3; break;
    case 14: CAPTIOCTL |= CAPTIOPOSEL1 + CAPTIOPOSEL2 + CAPTIOPOSEL3; break;
    case 15: CAPTIOCTL |= CAPTIOPOSEL0 +CAPTIOPOSEL1 + CAPTIOPOSEL2 + CAPTIOPOSEL3; break;
    default: break;
    }
    switch(PIN)
    {
    case BIT0: break;
    case BIT1: CAPTIOCTL |= CAPTIOPISEL0; break;
    case BIT2: CAPTIOCTL |= CAPTIOPISEL1; break;
    case BIT3: CAPTIOCTL |= CAPTIOPISEL0 + CAPTIOPISEL1; break;
    case BIT4: CAPTIOCTL |= CAPTIOPISEL2; break;
    case BIT5: CAPTIOCTL |= CAPTIOPISEL0 + CAPTIOPISEL2; break;
    case BIT6: CAPTIOCTL |= CAPTIOPISEL1 + CAPTIOPISEL2; break;
    case BIT7: CAPTIOCTL |= CAPTIOPISEL0 + CAPTIOPISEL1 + CAPTIOPISEL2; break;
    default: break;
    }
    CAPTIOCTL |= CAPTIOEN;
}

void pulse_LED(void)
{ 
    switch (key_pressed)
        {
    case 0: P1OUT &= ~(LED_1 + LED_2); break;
    case 1: P1OUT |= LED_1; break;
    case 2: P1OUT |= LED_2; break;
    case 3: P1OUT |= LED_1 + LED_2; break;
    case 4: P1OUT ^= LED_1 + LED_2; break;
    }
}
/* Watchdog Timer interrupt service routine*/
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(WDT_VECTOR))) watchdog_timer (void)
#else
#error Compiler not supported!
#endif
{
    TB0CCTL1 ^= CCIS0;                        // Create SW capture of CCR1
    __bic_SR_register_on_exit(LPM3_bits);     // Exit LPM3 on reti
}

Fullscreen msp430fr231x_pinosc_01.c Download

/* --COPYRIGHT--,BSD_EX
 * Copyright (c) 2014, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *******************************************************************************
 * 
 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//  MSP430FR231x Demo - Capacitive Touch, Pin Oscillator Method, 1 button
//
//  Description: Basic 1-button input using the built-in pin oscillation feature
//  on GPIO input structure. PinOsc signal feed into TB0CLK. WDT interval is used
//  to gate the measurements. Difference in measurements indicate button touch.
//  LEDs flash if input is touched.
//  
//  ACLK = REFO = 32kHz, MCLK = SMCLK = 1MHz DCO
//
//               MSP430FR2311
//             -----------------
//         /|\|              XIN|-
//          | |                 | 
//          --|RST          XOUT|-
//            |                 |
//            |             P1.1|<--Capacitive Touch Input 1
//            |                 |
//            |                 |
//            |                 |
//  LED 1  <--|P1.0             |
//            |                 |
//            |                 |
//
//   Darren Lu
//   Texas Instruments Inc.
//   Oct. 2015
//   Built with IAR Embedded Workbench v6.30 & Code Composer Studio v6.1
//******************************************************************************

#include <msp430.h>
/* Define User Configuration values */
/*----------------------------------*/
/* Defines WDT SMCLK interval for sensor measurements*/
#define WDT_meas_setting (DIV_SMCLK_512)
/* Defines WDT ACLK interval for delay between measurement cycles*/
#define WDT_delay_setting (DIV_ACLK_512)

/* Sensor settings*/
#define KEY_LVL     220                     // Defines threshold for a key press
/*Set to ~ half the max delta expected*/

/* Definitions for use with the WDT settings*/
#define DIV_ACLK_32768  (WDT_ADLY_1000)     // ACLK/32768
#define DIV_ACLK_8192   (WDT_ADLY_250)      // ACLK/8192 
#define DIV_ACLK_512    (WDT_ADLY_16)       // ACLK/512 
#define DIV_ACLK_64     (WDT_ADLY_1_9)      // ACLK/64 
#define DIV_SMCLK_32768 (WDT_MDLY_32)       // SMCLK/32768
#define DIV_SMCLK_8192  (WDT_MDLY_8)        // SMCLK/8192 
#define DIV_SMCLK_512   (WDT_MDLY_0_5)      // SMCLK/512 
#define DIV_SMCLK_64    (WDT_MDLY_0_064)    // SMCLK/64 

#define LED   (0x01)                        // P1.0 LED output

// Global variables for sensing
unsigned int base_cnt, meas_cnt;
int delta_cnt;
char key_pressed;
/* System Routines*/
void measure_count(void);                   // Measures each capacitive sensor
void pulse_LED(void);                       // LED gradient routine

int main( void )
{
    unsigned int i,j;
    WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;
    
    SFRIE1 |= WDTIE;                          // enable WDT interrupt
    P1DIR = LED;                              // P1.0 = LED
    P1OUT = 0x00;                             
    
    __bis_SR_register(GIE);                   // Enable interrupts
    
    measure_count();                          // Establish baseline capacitance
    base_cnt = meas_cnt;
    
    for(i=15; i>0; i--)                       // Repeat and avg base measurement
    { 
        measure_count();
        base_cnt = (meas_cnt+base_cnt)/2;
    }
    
    /* Main loop starts here*/
    while (1)
    {
        j = KEY_LVL;
        key_pressed = 0;                        // Assume no keys are pressed
        
        measure_count();                        // Measure all sensors
        
        delta_cnt = base_cnt - meas_cnt;  // Calculate delta: c_change
        
        /* Handle baseline measurment for a base C decrease*/
        if (delta_cnt < 0)                    // If negative: result increased
        {                                     // beyond baseline, i.e. cap dec
            base_cnt = (base_cnt+meas_cnt) >> 1; // Re-average quickly
            delta_cnt = 0;                    // Zero out for pos determination
        }
        if (delta_cnt > j)                    // Determine if each key is pressed 
        {                                     // per a preset threshold
            j = delta_cnt;
            key_pressed = 1;                    // key pressed
        }
        else
            key_pressed = 0;
        
        /* Delay to next sample */
        WDTCTL = WDT_delay_setting;             // WDT, ACLK, interval timer
        
        /* Handle baseline measurment for a base C increase*/
        if (!key_pressed)                       // Only adjust baseline down 
        {                                       // if no keys are touched
            base_cnt = base_cnt - 1;        // Adjust baseline down, should be 
        }                                       // slow to accomodate for genuine 
        pulse_LED();                           // changes in sensor C
        
        __bis_SR_register(LPM3_bits);
    }
}                                           // End Main

/* Measure count result (capacitance) of each sensor*/
/* Routine setup for four sensors, not dependent on NUM_SEN value!*/

void measure_count(void)
{ 
    TB0CTL = TBSSEL_3 + MC_2;                   // INCLK, cont mode
    TB0CCTL1 = CM_3 + CCIS_2 + CAP;               // Pos&Neg,GND,Cap
    
    /*Configure Ports for relaxation oscillator*/
    CAPTIOCTL |= CAPTIOEN + CAPTIOPOSEL0 + CAPTIOPISEL0; //P1.1
    
    /*Setup Gate Timer*/
    WDTCTL = WDT_meas_setting;              // WDT, ACLK, interval timer
    TB0CTL |= TBCLR;                        // Clear Timer_B TBR
    __bis_SR_register(LPM0_bits+GIE);       // Wait for WDT interrupt
    TB0CCTL1 ^= CCIS0;                      // Create SW capture of CCR1
    meas_cnt = TB0CCR1;                      // Save result
    WDTCTL = WDTPW + WDTHOLD;               // Stop watchdog timer
    CAPTIOCTL = 0;
}

void pulse_LED(void)
{ 
    if(key_pressed)
    {
        P1OUT ^= LED;
    }
    else
    {
        P1OUT = 0;
    }
}
/* Watchdog Timer interrupt service routine*/
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(WDT_VECTOR))) watchdog_timer (void)
#else
#error Compiler not supported!
#endif
{
    TB0CCTL1 ^= CCIS0;                        // Create SW capture of CCR1
    __bic_SR_register_on_exit(LPM3_bits);     // Exit LPM3 on reti
}

Regards,

Ling

0 Aref Smiley over 8 years ago in reply to Ling Zhu2

Intellectual 300 points

Hi Ling,

Thanks for your comments.

I made a development board for MSP430 FR 2532. I also ordered the captivate-FR2632 development kit to see how it works.

But my final goal is to program the MSP430FR2532 for captivative measurement. Here is what I have done:

1- I used CapTIvateDesignCenter App to generate the CCS code and then imported the code to CCS. (One self touch button (BTN00) is connected to the CAP.02 port). so I have only one RX00.

2- Here is the generated code:

-------------------------------------------------------------------------------------------------

#include <msp430.h> // Generic MSP430 Device Include
#include "driverlib.h" // MSPWare Driver Library
#include "captivate.h" // CapTIvate Touch Software Library
#include "CAPT_App.h" // CapTIvate Application Code
#include "CAPT_BSP.h" // CapTIvate EVM Board Support Package

void main(void)
{
//
// Initialize the MCU
// BSP_configureMCU() sets up the device IO and clocking
// The global interrupt enable is set to allow peripherals
// to wake the MCU.
//
WDTCTL = WDTPW | WDTHOLD;
BSP_configureMCU();
__bis_SR_register(GIE);

//
// Start the CapTIvate application
//
CAPT_appStart();

//
// Background Loop
//
while(1)
{
//
// Run the captivate application handler.
// Set LED1 while the app handler is running,
// and set LED2 if proximity is detected
// on any sensor.
//
LED1_ON;
if(CAPT_appHandler()==true)
LED2_ON;
else
LED2_OFF;
LED1_OFF;

//
// This is a great place to add in any
// background application code.
//
__no_operation();

//
// End of background loop iteration
// Go to sleep if there is nothing left to do
//
CAPT_appSleep();

} // End background loop
} // End main()

-----------------------------------------------------------------------------------------

I want to store the values of the filtered count and the long term average (from tElement) in two separate variables (Like V1 and V2). This is what I found as the suggested code for reading raw count:

extern tElement BTN00_E00;
uint16_t rawSample;

// Perform the update
CAPT_updateSensorRawCount(
        &keypadSensor,      // Pointer to the sensor to update
        eStandard,          // Conversion type
        e2xOversampling,    // Oversampling type
        LPM0_bits           // Low power mode to use
    );

// Read out the data
rawSample = BTN00_E00.ui16CompositeRawCount;

Am I in a right way? can I use the same code for reading filtered count and the long term average? Do I need to change anything? should I place the code in the while loop?

0 Ling Zhu2 over 8 years ago in reply to Aref Smiley

TI__Genius 9570 points

Hi Aref,

You might need to register a callback function for your button. And put your code in this function.

For details and examples, see

Ling

0 Aref Smiley over 8 years ago in reply to Ling Zhu2

Intellectual 300 points

Thanks Ling,

In my previous program, I checked the "BTN00_E00_RawCnts" in the debug mode and it is updating. However, I can not check the "rawSample" values. Do you have any example code which shows me how to monitor the value in the terminal of the CCS. Do I need to add any new library and/or functions?

Sorry, I am new to MSP430.

Thanks for your time.

void printf(char *, ...);
void main(void)
{
//
// Initialize the MCU
// BSP_configureMCU() sets up the device IO and clocking
// The global interrupt enable is set to allow peripherals
// to wake the MCU.
//
WDTCTL = WDTPW | WDTHOLD;
BSP_configureMCU();

__bis_SR_register(GIE);

//
// Start the CapTIvate application
//
CAPT_appStart();

//
// Background Loop
//
while(1)
{
//
// Run the captivate application handler.
// Set LED1 while the app handler is running,
// and set LED2 if proximity is detected
// on any sensor.
//
//LED1_ON;
//if(CAPT_appHandler()==true)
// LED2_ON;
//else
// LED2_OFF;
//LED1_OFF;

extern tElement BTN00_E00;
uint16_t rawSample;

// Perform the update
CAPT_updateSensorRawCount(
&BTN00, // Pointer to the sensor to update
eStandard, // Conversion type
e2xOversampling, // Oversampling type
LPM0_bits // Low power mode to use
);

// Read out the data
rawSample = BTN00_E00.ui16CompositeRawCount;

printf("%u", rawSample );
printf("F\r\n");

// This is a great place to add in any
// background application code.
//
__no_operation();

//
// End of background loop iteration
// Go to sleep if there is nothing left to do
//
//CAPT_appSleep();

} // End background loop
} // End main()

0 Ling Zhu2 over 8 years ago in reply to Aref Smiley

TI__Genius 9570 points

cem_touch.zipHi Aref,

Why do you want to output rawSample value.

We usually use CapTIvate Design Center to watch and tuning the value. And this on line tuning function use the UART of FR2532 which means that UART can't be used for printf output.

If you still would like to output rawSample value throuth printf, you may need to disable the online tuning feature.

Attached is the example project which can output user defined data package through UART, the baudrate is 9600.

What you have to do is replace the CAPT_UserConfig.c and CAPT_UserConfig.h files in captivate_config folder with your own files.

Regards,

Ling

0 Aref Smiley over 8 years ago in reply to Ling Zhu2

Intellectual 300 points

Hi Ling,

Thanks for your answer.

RawSample value is just an example of the data which I want to monitor. But the final goal is to detect the capacitance changes. There will be couple of simple touch button (electrodes) connected to the MUC for capacitive changes monitoring.

I noticed that the files you send me are for MSP430FR2522 and MSP430FR2512 MUCs. I made the MSP430FR2532 developemet board and I currently use it.

I imported your suggested program to my MCU, but it does not show anything in the terminal port. I added only "printf " function in the while loop (+ printf lib).

Do I need to do anything else?

Thanks,

0 Ling Zhu2 over 8 years ago in reply to Aref Smiley

TI__Genius 9570 points

Hi Aref,

See attached. Baudrate is 14400.Test_case.zip

Ling

**Attention** This is a public forum

MSP low-power microcontrollers

MSP low-power microcontroller forum

CCS/MSP430FR2311: Capacitive touch