use mbed os
Dependents: Seeed_Grove_I2C_Touch_Example
Fork of MPR121 by
Diff: MPR121.cpp
- Revision:
- 5:3934358ec2b7
- Parent:
- 3:828260f21de6
- Child:
- 6:b6bb38744edd
diff -r 828260f21de6 -r 3934358ec2b7 MPR121.cpp --- a/MPR121.cpp Tue Aug 27 21:39:33 2013 +0000 +++ b/MPR121.cpp Fri Aug 15 23:00:13 2014 +0000 @@ -24,13 +24,22 @@ #include "mbed_debug.h" #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_ADDR i2c_addr) +{ + _i2c = &i2c; + _irq = NULL; + _i2c_addr = (i2c_addr << 1); + return; } @@ -39,11 +48,13 @@ // set the i2c speed _i2c->frequency(400000); // irq is open-collector and active-low - _irq->mode(PullUp); - + 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 @@ -54,25 +65,23 @@ 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 - { + 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 - { + 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 @@ -81,10 +90,10 @@ 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; } @@ -96,8 +105,10 @@ // lower current consumption mode MPR121::writeRegister(ECR, 0x8f); // and attach the interrupt handler - _irq->fall(this, &MPR121::handler); - + if(_irq != NULL) { + _irq->fall(this, &MPR121::handler); + } + return; } @@ -111,7 +122,7 @@ MPR121::writeRegister(ECR, 0x0); MPR121::writeRegister(AUTO_CFG0, 0x0); // REG 0x7B MPR121::writeRegister(AUTO_CFG1, 0x0); // REG 0x7C - + return; } @@ -122,6 +133,9 @@ uint16_t MPR121::buttonPressed(void) { + if(_irq == NULL) { + handler(); + } _button_has_changed = 0; return _button; } @@ -129,13 +143,24 @@ void MPR121::registerDump(Serial &obj) const { uint8_t reg_val = 0; - - for(int i=0; i<0x80; i++) - { + + 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; } @@ -148,19 +173,18 @@ // 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) - { + 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; } @@ -168,14 +192,13 @@ { char buf[2] = {reg, data}; uint8_t result = 0; - + result = _i2c->write(_i2c_addr, buf, 2); - - if(result && DEBUG) - { + + if(result && DEBUG) { debug("I2c write failed\n"); } - + return; } @@ -183,14 +206,13 @@ { 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) - { + result &= _i2c->read(_i2c_addr, &data, 1); + + if(result && DEBUG) { debug("I2c read failed\n"); } - + return data; }