Diff: MPR121.cpp

Revision:

25:534ca7bbccf1

Parent:

24:3fda4fe39ac6

--- a/MPR121.cpp	Sun Jul 02 15:11:10 2017 -0600
+++ b/MPR121.cpp	Sun Jul 02 16:33:37 2017 -0600
@@ -25,221 +25,27 @@
 
 #define DEBUG 1
 
-MPR121::MPR121(I2C &i2c, InterruptIn &pin, MPR121_ADDR i2c_addr)
-{
-    _i2c = &i2c;
-    _irq = &pin;
-    _i2c_addr = (i2c_addr << 1);
-
-    return;
-}
-
-MPR121::MPR121(I2C &i2c)
-{
+MPR121::MPR121(I2C &i2c) {
     _i2c = &i2c;
-    _irq = NULL;
     _i2c_addr = (0x1b << 1);
-    char reg[1] = { 0x03 };
-    int result=0;
-    char data = 10;
-    result = _i2c->write(_i2c_addr, reg, 1, true);
-        if(result == 0 ) debug("result is 0");
-    result = _i2c->read(_i2c_addr, &data, 1); 
-        if(result == 0 ) debug("result is 0");
-
-    return;
 }
 
-void MPR121::init(void)
-{
-    // set the i2c speed
-    /* _i2c->frequency(400000);
- */
-    // irq is open-collector and active-low
-    if(_irq != NULL) {
-        _irq->mode(PullUp);
-    }
 
-    // setup and registers - start with POR values (must be in stop mode)
-    MPR121::writeRegister(SRST, 0x63); //REG 0x80
-
-    // Baseline Filtering Control Register (changes response sensitivity)
-    // http://cache.freescale.com/files/sensors/doc/app_note/AN3891.pdf
-    MPR121::writeRegister(MHDR, 0x1);  //REG 0x2B
-    MPR121::writeRegister(NHDR, 0x1);  //REG 0x2C
-    MPR121::writeRegister(NCLR, 0x0);  //REG 0x2D
-    MPR121::writeRegister(FDLR, 0x0);  //REG 0x2E
-    MPR121::writeRegister(MHDF, 0x1);  //REG 0x2F
-    MPR121::writeRegister(NHDF, 0x1);  //REG 0x30
-    MPR121::writeRegister(NCLF, 0xFF); //REG 0x31
-    MPR121::writeRegister(FDLF, 0x2);  //REG 0x32
-
-    // Touch / Release Threshold
-    // cache.freescale.com/files/sensors/doc/app_note/AN3892.pdf
-    for(int i=0; i<(12*2); i+=2) { // touch
-        MPR121::writeRegister(static_cast<MPR121_REGISTER>(E0TTH+i), 0x20); //REG 0x41...0x58 odd
-    }
-    for(int i=0; i<(12*2); i+=2) { // release
-        MPR121::writeRegister(static_cast<MPR121_REGISTER>(E0RTH+i), 0x10); //REG 0x41...0x58 even
-    }
-
-    // Debounce Register DR=b6...4, DT=b2...0
-    MPR121::writeRegister(DT_DR, 0x11); //REG 0x5B
-
-    // Filter and Global CDC CDT Configuration (sample time, charge current)
-    MPR121::writeRegister(CDC_CONFIG, 0x10); //REG 0x5C default 10
-    MPR121::writeRegister(CDT_CONFIG, 0x20); //REG 0x5D default 24
-
-    // Auto-Configuration Registers
-    // http://cache.freescale.com/files/sensors/doc/app_note/AN3889.pdf
-    MPR121::writeRegister(AUTO_CFG0, 0x33); // REG 0x7B
-    MPR121::writeRegister(AUTO_CFG1, 0x07); // REG 0x7C
-    MPR121::writeRegister(USL, 0xc9);       // REG 0x7D((3.3-.07)/3.3) * 256
-    MPR121::writeRegister(LSL, 0x83);       // REG 0x7E((3.3-.07)/3.3) * 256 * 0.65f
-    MPR121::writeRegister(TL,  0xb5);       // REG 0x7F((3.3-.07)/3.3) * 256 * 0.9f
-    // 255 > USL > TL > LSL > 0
-
-    // Electrode Configuration Register - enable all 12 and start
-    MPR121::writeRegister(ECR, 0x8f);
-
-    return;
+bool MPR121::isPressed(void) {
+    bool result = buttonPressed() == 0 ? false : true;
+    return result;
 }
 
-void MPR121::enable(void)
-{
-    _button = 0;
-    _button_has_changed = 0;
-    // enable the 12 electrodes - allow disable to put device into
-    //  lower current consumption mode
-    MPR121::writeRegister(ECR, 0x8f);
-    // and attach the interrupt handler
-    if(_irq != NULL) {
-        _irq->fall(this, &MPR121::handler);
-    }
-
-    return;
-}
-
-void MPR121::disable(void)
-{
-    // detach the interrupt handler
-    _irq->fall(NULL);
-    _button = 0;
-    _button_has_changed = 0;
-    //  put the device in low current consumption mode - dont re-init registers
-    MPR121::writeRegister(ECR, 0x0);
-    MPR121::writeRegister(AUTO_CFG0, 0x0); // REG 0x7B
-    MPR121::writeRegister(AUTO_CFG1, 0x0); // REG 0x7C
-
-    return;
-}
-
-uint32_t MPR121::isPressed(void)
-{
-
+uint16_t MPR121::buttonPressed(void) {
     char reg[1] = { 0x03 };
     int result=0;
     char data = -1;
     result = _i2c->write(_i2c_addr, reg, 1, true);
-        if(result == 0 ) debug("result is 0");
-    result = _i2c->read(_i2c_addr, &data, 1); 
-        if(result == 0 ) debug("result is 0");
-    if(data > 0) data = true;
-    return data;
-    /* return _button_has_changed;
- */
-}
-
-uint16_t MPR121::buttonPressed(void)
-{
-    char reg[1] = { 0x03 };
-    int result=0;
-    char data = -1;
-    result = _i2c->write(_i2c_addr, reg, 1, true);
-        if(result == 0 ) debug("result is 0");
-    result = _i2c->read(_i2c_addr, &data, 1); 
-        if(result == 0 ) debug("result is 0");
+    if(result == 0 ) debug("result is 0");
+    result = _i2c->read(_i2c_addr, &data, 1);
+    if(result == 0 ) debug("result is 0");
     if(data == 4) data = 3;
     if(data == 2) data = 2;
     if(data == 1) data = 1;
     return data;
 }
-
-void MPR121::registerDump(Serial &obj) const
-{
-    uint8_t reg_val = 0;
-
-    for(int i=0; i<0x80; i++) {
-        reg_val = MPR121::readRegister(static_cast<MPR121_REGISTER>(i));
-        obj.printf("Reg 0x%02x: 0x%02x \n", i, reg_val);
-    }
-
-    return;
-}
-
-void MPR121::registerDump(void) const
-{
-    uint8_t reg_val = 0;
-
-    for(int i=0; i<0x80; i++) {
-        reg_val = MPR121::readRegister(static_cast<MPR121_REGISTER>(i));
-        printf("Reg 0x%02x: 0x%02x \n", i, reg_val);
-    }
-
-    return;
-}
-
-void MPR121::handler(void)
-{
-    uint16_t reg_val = 0, oor_val = 0;
-    // read register 0 and 1
-    reg_val  = MPR121::readRegister(ELE0_7_STAT);
-    reg_val |= MPR121::readRegister(ELE8_11_STAT) << 8;
-    // 2 and 3
-    oor_val  = MPR121::readRegister(ELE0_7_OOR_STAT);
-    oor_val |= MPR121::readRegister(ELE8_11_OOR_STAT) << 8;
-
-    // debugging stuff and errors - if OOR fails someone was touching the pad during auto-config
-    //  Just reboot until they're not doing this
-    if((0 != oor_val) && DEBUG) {
-        debug("MPR121 OOR failure - 0x%04x\n", oor_val);
-        wait(0.1f);
-        NVIC_SystemReset();
-    }
-
-    _button = reg_val;
-    _button_has_changed = 1;
-
-    return;
-}
-
-void MPR121::writeRegister(MPR121_REGISTER const reg, uint8_t const data) const
-{
-    char buf[2] = {reg, data};
-    uint8_t result = 0;
-
-    result = _i2c->write(_i2c_addr, buf, 2);
-    if(result && DEBUG)
-    {
-        debug("I2C write failed\n");
-    }
-
-    return;
-}
-
-uint8_t MPR121::readRegister(MPR121_REGISTER const reg) const
-{
-    char buf[1] = {reg}, data = 0;
-    uint8_t result = 1;
-
-    result &= _i2c->write(_i2c_addr, buf, 1, true);
-    result &= _i2c->read(_i2c_addr, &data, 1); 
-    
-    if(result && DEBUG)
-    {
-        debug("I2C read failed\n");
-    }
-
-    return data;
-}
-