use mbed os
Dependents: Seeed_Grove_I2C_Touch_Example
Fork of MPR121 by
MPR121.h@0:42add775212a, 2013-03-07 (annotated)
- Committer:
- sam_grove
- Date:
- Thu Mar 07 19:25:08 2013 +0000
- Revision:
- 0:42add775212a
- Child:
- 1:cee45334b36a
Working baseline example
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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sam_grove | 0:42add775212a | 1 | /** |
sam_grove | 0:42add775212a | 2 | * @file MPR121.h |
sam_grove | 0:42add775212a | 3 | * @brief Device driver - MPR121 capactiive touch IC |
sam_grove | 0:42add775212a | 4 | * @author sam grove |
sam_grove | 0:42add775212a | 5 | * @version 1.0 |
sam_grove | 0:42add775212a | 6 | * @see http://cache.freescale.com/files/sensors/doc/data_sheet/MPR121.pdf |
sam_grove | 0:42add775212a | 7 | * |
sam_grove | 0:42add775212a | 8 | * Copyright (c) 2013 |
sam_grove | 0:42add775212a | 9 | * |
sam_grove | 0:42add775212a | 10 | * Licensed under the Apache License, Version 2.0 (the "License"); |
sam_grove | 0:42add775212a | 11 | * you may not use this file except in compliance with the License. |
sam_grove | 0:42add775212a | 12 | * You may obtain a copy of the License at |
sam_grove | 0:42add775212a | 13 | * |
sam_grove | 0:42add775212a | 14 | * http://www.apache.org/licenses/LICENSE-2.0 |
sam_grove | 0:42add775212a | 15 | * |
sam_grove | 0:42add775212a | 16 | * Unless required by applicable law or agreed to in writing, software |
sam_grove | 0:42add775212a | 17 | * distributed under the License is distributed on an "AS IS" BASIS, |
sam_grove | 0:42add775212a | 18 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
sam_grove | 0:42add775212a | 19 | * See the License for the specific language governing permissions and |
sam_grove | 0:42add775212a | 20 | * limitations under the License. |
sam_grove | 0:42add775212a | 21 | */ |
sam_grove | 0:42add775212a | 22 | |
sam_grove | 0:42add775212a | 23 | #ifndef MPR121_H |
sam_grove | 0:42add775212a | 24 | #define MPR121_H |
sam_grove | 0:42add775212a | 25 | |
sam_grove | 0:42add775212a | 26 | #include "mbed.h" |
sam_grove | 0:42add775212a | 27 | |
sam_grove | 0:42add775212a | 28 | /** Using the Sparkfun SEN-10250 |
sam_grove | 0:42add775212a | 29 | * |
sam_grove | 0:42add775212a | 30 | * Example: |
sam_grove | 0:42add775212a | 31 | * @code |
sam_grove | 0:42add775212a | 32 | * #include "mbed.h" |
sam_grove | 0:42add775212a | 33 | * #include "MPR121.h" |
sam_grove | 0:42add775212a | 34 | * |
sam_grove | 0:42add775212a | 35 | * DigitalOut myled(LED1); |
sam_grove | 0:42add775212a | 36 | * Serial pc(USBTX, USBRX); |
sam_grove | 0:42add775212a | 37 | * |
sam_grove | 0:42add775212a | 38 | * I2C i2c(p28, p27); |
sam_grove | 0:42add775212a | 39 | * InterruptIn irq(p26); |
sam_grove | 0:42add775212a | 40 | * MPR121 touch_pad(i2c, irq, MPR121::ADDR_VSS); |
sam_grove | 0:42add775212a | 41 | * |
sam_grove | 0:42add775212a | 42 | * int main() |
sam_grove | 0:42add775212a | 43 | * { |
sam_grove | 0:42add775212a | 44 | * pc.baud(921600); // boost the communication speed |
sam_grove | 0:42add775212a | 45 | * printf("\033[2J"); // clear the terminal |
sam_grove | 0:42add775212a | 46 | * printf("\033[1;1H");// and set the cursor to home |
sam_grove | 0:42add775212a | 47 | * wait(0.1f); |
sam_grove | 0:42add775212a | 48 | * printf("*******************************************************\n"); |
sam_grove | 0:42add775212a | 49 | * |
sam_grove | 0:42add775212a | 50 | * touch_pad.init(); |
sam_grove | 0:42add775212a | 51 | * touch_pad.enable(); |
sam_grove | 0:42add775212a | 52 | * |
sam_grove | 0:42add775212a | 53 | * while(1) |
sam_grove | 0:42add775212a | 54 | * { |
sam_grove | 0:42add775212a | 55 | * if(touch_pad.isPressed()) |
sam_grove | 0:42add775212a | 56 | * { |
sam_grove | 0:42add775212a | 57 | * uint16_t button_val = touch_pad.buttonPressed(); |
sam_grove | 0:42add775212a | 58 | * printf("button = 0x%04x\n", button_val); |
sam_grove | 0:42add775212a | 59 | * myled = (button_val>0) ? 1 : 0; |
sam_grove | 0:42add775212a | 60 | * } |
sam_grove | 0:42add775212a | 61 | * } |
sam_grove | 0:42add775212a | 62 | * } |
sam_grove | 0:42add775212a | 63 | * @endcode |
sam_grove | 0:42add775212a | 64 | */ |
sam_grove | 0:42add775212a | 65 | |
sam_grove | 0:42add775212a | 66 | /** |
sam_grove | 0:42add775212a | 67 | * @class MPR121 |
sam_grove | 0:42add775212a | 68 | * @brief API abstraction for the MPR121 capacitive touch IC |
sam_grove | 0:42add775212a | 69 | */ |
sam_grove | 0:42add775212a | 70 | class MPR121 |
sam_grove | 0:42add775212a | 71 | { |
sam_grove | 0:42add775212a | 72 | private: |
sam_grove | 0:42add775212a | 73 | |
sam_grove | 0:42add775212a | 74 | I2C *_i2c; |
sam_grove | 0:42add775212a | 75 | InterruptIn *_irq; |
sam_grove | 0:42add775212a | 76 | uint8_t _i2c_addr; |
sam_grove | 0:42add775212a | 77 | volatile uint16_t _button; |
sam_grove | 0:42add775212a | 78 | volatile uint32_t _button_has_changed; |
sam_grove | 0:42add775212a | 79 | |
sam_grove | 0:42add775212a | 80 | /** The interrupt handler for the IRQ pin |
sam_grove | 0:42add775212a | 81 | */ |
sam_grove | 0:42add775212a | 82 | void handler(void); |
sam_grove | 0:42add775212a | 83 | |
sam_grove | 0:42add775212a | 84 | public: |
sam_grove | 0:42add775212a | 85 | |
sam_grove | 0:42add775212a | 86 | /** |
sam_grove | 0:42add775212a | 87 | * @enum MPR121_ADDR |
sam_grove | 0:42add775212a | 88 | * @brief Possible terminations for the ADDR pin |
sam_grove | 0:42add775212a | 89 | */ |
sam_grove | 0:42add775212a | 90 | enum MPR121_ADDR |
sam_grove | 0:42add775212a | 91 | { |
sam_grove | 0:42add775212a | 92 | ADDR_VSS = 0x5A, /*!< ADDR connected to VSS */ |
sam_grove | 0:42add775212a | 93 | ADDR_VDD, /*!< ADDR connected to VDD */ |
sam_grove | 0:42add775212a | 94 | ADDR_SCL, /*!< ADDR connected to SDA */ |
sam_grove | 0:42add775212a | 95 | ADDR_SDA /*!< ADDR connected to SCL */ |
sam_grove | 0:42add775212a | 96 | }; |
sam_grove | 0:42add775212a | 97 | |
sam_grove | 0:42add775212a | 98 | /** |
sam_grove | 0:42add775212a | 99 | * @enum MPR121_REGISTER |
sam_grove | 0:42add775212a | 100 | * @brief The device register map |
sam_grove | 0:42add775212a | 101 | */ |
sam_grove | 0:42add775212a | 102 | enum MPR121_REGISTER |
sam_grove | 0:42add775212a | 103 | { |
sam_grove | 0:42add775212a | 104 | ELE0_7_STAT = 0x00, |
sam_grove | 0:42add775212a | 105 | ELE8_11_STAT, ELE0_7_OOR_STAT, ELE8_11_OOR_STAT, EFD0LB, EFD0HB, |
sam_grove | 0:42add775212a | 106 | EFD1LB, EFD1HB, EFD2LB, EFD2HB, EFD3LB, EFD3HB, EFD4LB, EFD4HB, EFD5LB, EFD5HB, |
sam_grove | 0:42add775212a | 107 | |
sam_grove | 0:42add775212a | 108 | EFD6LB = 0x10, |
sam_grove | 0:42add775212a | 109 | EFD6HB, EFD7LB, EFD7HB, EFD8LB, EFD8HB, EFD9LB, EFD9HB, EFD10LB, |
sam_grove | 0:42add775212a | 110 | EFD10HB, EFD11LB, EFD11HB, EFDPROXLB, EFDPROXHB, E0BV, E1BV, |
sam_grove | 0:42add775212a | 111 | |
sam_grove | 0:42add775212a | 112 | E2BV = 0x20, |
sam_grove | 0:42add775212a | 113 | E3BV, E4BV, E5BV, E6BV, E7BV, E8BV, E9BV, E10BV, E11BV, EPROXBV, |
sam_grove | 0:42add775212a | 114 | MHDR, NHDR, NCLR, FDLR, MHDF, |
sam_grove | 0:42add775212a | 115 | |
sam_grove | 0:42add775212a | 116 | NHDF = 0x30, |
sam_grove | 0:42add775212a | 117 | NCLF, FDLF, NHDT, NCLT, FDLT, MHDPROXR, NHDPROXR, NCLPROXR, |
sam_grove | 0:42add775212a | 118 | FDLPROXR, MHDPROXF, NHDPROXF, NCLPROXF, FDLPROXF, NHDPROXT, NCLPROXT, |
sam_grove | 0:42add775212a | 119 | |
sam_grove | 0:42add775212a | 120 | FDLPROXT = 0x40, |
sam_grove | 0:42add775212a | 121 | E0TTH, E0RTH, E1TTH, E1RTH, E2TTH, E2RTH, E3TTH, E3RTH, |
sam_grove | 0:42add775212a | 122 | E4TTH, E4RTH, E5TTH, E5RTH, E6TTH, E6RTH, E7TTH, |
sam_grove | 0:42add775212a | 123 | |
sam_grove | 0:42add775212a | 124 | E7RTH = 0x50, |
sam_grove | 0:42add775212a | 125 | E8TTH, E8RTH, E9TTH, E9RTH, E10TTH, E10RTH, E11TTH, E11RTH, |
sam_grove | 0:42add775212a | 126 | EPROXTTH, EPROXRTH, DT_DR, CDC_CONFIG, CDT_CONFIG, ECR, CDC0, |
sam_grove | 0:42add775212a | 127 | |
sam_grove | 0:42add775212a | 128 | CDC1 = 0x60, |
sam_grove | 0:42add775212a | 129 | CDC2, CDC3, CDC4, CDC5, CDC6, CDC7, CDC8, CDC9, CDC10, CDC11, CDCPROX, CDT0_CDT1, |
sam_grove | 0:42add775212a | 130 | CDT2_CDT3, CDT4_CDT5, CDT6_CDT7, |
sam_grove | 0:42add775212a | 131 | |
sam_grove | 0:42add775212a | 132 | CDT8_CDT9 = 0x70, |
sam_grove | 0:42add775212a | 133 | CDT10_CDT11, CDTPROX, GPIO_CTRL0, GPIO_CTRL1, GPIO_DATA, GPIO_DIR, GPIO_EN, GPIO_SET, |
sam_grove | 0:42add775212a | 134 | GPIO_CLR, GPIO_TOGGLE, AUTO_CFG0, AUTO_CFG1, USL, LSL, TL, |
sam_grove | 0:42add775212a | 135 | |
sam_grove | 0:42add775212a | 136 | SRST = 0x80 |
sam_grove | 0:42add775212a | 137 | }; |
sam_grove | 0:42add775212a | 138 | |
sam_grove | 0:42add775212a | 139 | /** Create the MPR121 object |
sam_grove | 0:42add775212a | 140 | * @param i2c A defined I2C object |
sam_grove | 0:42add775212a | 141 | * @param pin A defined InterruptIn object |
sam_grove | 0:42add775212a | 142 | * @param i2c_addr Connection of the address line |
sam_grove | 0:42add775212a | 143 | */ |
sam_grove | 0:42add775212a | 144 | MPR121(I2C &i2c, InterruptIn &pin, MPR121_ADDR i2c_addr); |
sam_grove | 0:42add775212a | 145 | |
sam_grove | 0:42add775212a | 146 | /** Clear state vars and initilize the dependant objects |
sam_grove | 0:42add775212a | 147 | */ |
sam_grove | 0:42add775212a | 148 | void init(void); |
sam_grove | 0:42add775212a | 149 | |
sam_grove | 0:42add775212a | 150 | /** Allow the IC to run and collect user input |
sam_grove | 0:42add775212a | 151 | */ |
sam_grove | 0:42add775212a | 152 | void enable(void); |
sam_grove | 0:42add775212a | 153 | |
sam_grove | 0:42add775212a | 154 | /** Stop the IC and put into low power mode |
sam_grove | 0:42add775212a | 155 | */ |
sam_grove | 0:42add775212a | 156 | void disable(void); |
sam_grove | 0:42add775212a | 157 | |
sam_grove | 0:42add775212a | 158 | /** Determine if a new button press event occured |
sam_grove | 0:42add775212a | 159 | * Upon calling the state is cleared until another press is detected |
sam_grove | 0:42add775212a | 160 | * @return 1 if a press has been detected since the last call, 0 otherwise |
sam_grove | 0:42add775212a | 161 | */ |
sam_grove | 0:42add775212a | 162 | uint32_t isPressed(void); |
sam_grove | 0:42add775212a | 163 | |
sam_grove | 0:42add775212a | 164 | /** Get the electrode status (ELE12 ... ELE0 -> b15 xxx b11 ... b0 |
sam_grove | 0:42add775212a | 165 | * The buttons are bit mapped. ELE0 = b0 ... ELE11 = b11 b12 ... b15 undefined |
sam_grove | 0:42add775212a | 166 | * @return The state of all buttons |
sam_grove | 0:42add775212a | 167 | */ |
sam_grove | 0:42add775212a | 168 | uint16_t buttonPressed(void); |
sam_grove | 0:42add775212a | 169 | |
sam_grove | 0:42add775212a | 170 | /** print the register map and values to the console |
sam_grove | 0:42add775212a | 171 | */ |
sam_grove | 0:42add775212a | 172 | void registerDump(void); |
sam_grove | 0:42add775212a | 173 | |
sam_grove | 0:42add775212a | 174 | /** Write to a register (exposed for debugging reasons) |
sam_grove | 0:42add775212a | 175 | * Note: most writes are only valid in stop mode |
sam_grove | 0:42add775212a | 176 | * @param reg The register to be written |
sam_grove | 0:42add775212a | 177 | * @param data The data to be written |
sam_grove | 0:42add775212a | 178 | */ |
sam_grove | 0:42add775212a | 179 | void writeRegister(uint8_t reg, uint8_t data); |
sam_grove | 0:42add775212a | 180 | |
sam_grove | 0:42add775212a | 181 | /** Read from a register (exposed for debugging reasons) |
sam_grove | 0:42add775212a | 182 | * @param reg The register to read from |
sam_grove | 0:42add775212a | 183 | * @return The register contents |
sam_grove | 0:42add775212a | 184 | */ |
sam_grove | 0:42add775212a | 185 | uint8_t readRegister(uint8_t reg); |
sam_grove | 0:42add775212a | 186 | |
sam_grove | 0:42add775212a | 187 | }; |
sam_grove | 0:42add775212a | 188 | |
sam_grove | 0:42add775212a | 189 | #endif |