Nathan Yonkee
use mbed os
Dependents: Seeed_Grove_I2C_Touch_Example
Diff: MPR121.cpp
- Revision:
- 9:8cb5ce483be3
- Parent:
- 6:b6bb38744edd
- Child:
- 11:ad26c0810f02
--- a/MPR121.cpp Thu Jun 29 15:56:48 2017 +0000
+++ b/MPR121.cpp Thu Jun 29 11:03:25 2017 -0600
@@ -1,219 +1,219 @@
-/**
- * @file MPR121.cpp
- * @brief Device driver - MPR121 capactiive touch IC
- * @author sam grove
- * @version 1.0
- * @see http://cache.freescale.com/files/sensors/doc/data_sheet/MPR121.pdf
- *
- * Copyright (c) 2013
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "MPR121.h"
-#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;
-}
-
-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;
-}
-
-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)
-{
- return _button_has_changed;
-}
-
-uint16_t MPR121::buttonPressed(void)
-{
- if(_irq == NULL) {
- handler();
- }
- _button_has_changed = 0;
- return _button;
-}
-
-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;
-}
+/**
+ * @file MPR121.cpp
+ * @brief Device driver - MPR121 capactiive touch IC
+ * @author sam grove
+ * @version 1.0
+ * @see http://cache.freescale.com/files/sensors/doc/data_sheet/MPR121.pdf
+ *
+ * Copyright (c) 2013
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MPR121.h"
+#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;
+}
+
+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;
+}
+
+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)
+{
+ return _button_has_changed;
+}
+
+uint16_t MPR121::buttonPressed(void)
+{
+ if(_irq == NULL) {
+ handler();
+ }
+ _button_has_changed = 0;
+ return _button;
+}
+
+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;
+}