Owen Brotherwood / microbitmpr121

Start of a microbit mpr121 library

Dependents:   microbitmpr121-example

MicroBitMpr121.cpp@2:4e130924a398, 2017-01-16 (annotated)

Committer:
owenbrotherwood
Date:
Mon Jan 16 14:00:36 2017 +0000
Revision:
2:4e130924a398
Parent:
1:f6fed00a3ff2
Child:
3:a91b1bb396ca
problems in library;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
owenbrotherwood 0:fb4572fc4901 1 #include "MicroBit.h"
owenbrotherwood 1:f6fed00a3ff2 2 #include "MicroBitI2C.h"
owenbrotherwood 1:f6fed00a3ff2 3 #include "MicroBitMpr121.h"
owenbrotherwood 0:fb4572fc4901 4
owenbrotherwood 0:fb4572fc4901 5 #define DEBUG 1
owenbrotherwood 1:f6fed00a3ff2 6
owenbrotherwood 1:f6fed00a3ff2 7 //MicroBitMpr121::MicroBitMpr121(PinName sda, PinName scl, PinName irq, MPR121_ADDR addr)
owenbrotherwood 1:f6fed00a3ff2 8 MicroBitMpr121::MicroBitMpr121()
owenbrotherwood 0:fb4572fc4901 9 {
owenbrotherwood 2:4e130924a398 10 I2C _i2c = MicroBitI2C(I2C_SDA0, I2C_SCL0);
owenbrotherwood 2:4e130924a398 11 uint8_t addr = ADDR_SDA;
owenbrotherwood 1:f6fed00a3ff2 12 // PinName _irq = irq; //TODO :: use
owenbrotherwood 1:f6fed00a3ff2 13 uint8_t _i2c_addr = (addr << 1); // To get 8bit address ...?
owenbrotherwood 0:fb4572fc4901 14 return;
owenbrotherwood 0:fb4572fc4901 15 }
owenbrotherwood 0:fb4572fc4901 16
owenbrotherwood 1:f6fed00a3ff2 17 void MicroBitMpr121::init(void)
owenbrotherwood 0:fb4572fc4901 18 {
owenbrotherwood 1:f6fed00a3ff2 19 P16.setPull(PullUp); //TODO use _irq and not hard code
owenbrotherwood 1:f6fed00a3ff2 20 MicroBitI2C::write(SRST, 0x63);
owenbrotherwood 1:f6fed00a3ff2 21 MicroBitI2C::write(MHDR, 0x1);
owenbrotherwood 1:f6fed00a3ff2 22 MicroBitI2C::write(NHDR, 0x1);
owenbrotherwood 1:f6fed00a3ff2 23 MicroBitI2C::write(NCLR, 0x0);
owenbrotherwood 1:f6fed00a3ff2 24 MicroBitI2C::write(FDLR, 0x0);
owenbrotherwood 1:f6fed00a3ff2 25 MicroBitI2C::write(MHDF, 0x1);
owenbrotherwood 1:f6fed00a3ff2 26 MicroBitI2C::write(NHDF, 0x1);
owenbrotherwood 1:f6fed00a3ff2 27 MicroBitI2C::write(NCLF, 0xFF);
owenbrotherwood 1:f6fed00a3ff2 28 MicroBitI2C::write(FDLF, 0x2);
owenbrotherwood 1:f6fed00a3ff2 29 for(int i=0; i<(12*2); i+=2) {
owenbrotherwood 1:f6fed00a3ff2 30 MicroBitI2C::write(static_cast<MPR121_REGISTER>(E0TTH+i), 0x20);
owenbrotherwood 0:fb4572fc4901 31 }
owenbrotherwood 1:f6fed00a3ff2 32 for(int i=0; i<(12*2); i+=2) {
owenbrotherwood 1:f6fed00a3ff2 33 MicroBitI2C::write(static_cast<MPR121_REGISTER>(E0RTH+i), 0x10);
owenbrotherwood 0:fb4572fc4901 34 }
owenbrotherwood 1:f6fed00a3ff2 35 MicroBitI2C::write(DT_DR, 0x11);
owenbrotherwood 1:f6fed00a3ff2 36 MicroBitI2C::write(CDC_CONFIG, 0x10);
owenbrotherwood 1:f6fed00a3ff2 37 MicroBitI2C::write(CDT_CONFIG, 0x20);
owenbrotherwood 1:f6fed00a3ff2 38 MicroBitI2C::write(AUTO_CFG0, 0x33);
owenbrotherwood 1:f6fed00a3ff2 39 MicroBitI2C::write(AUTO_CFG1, 0x07);
owenbrotherwood 1:f6fed00a3ff2 40 MicroBitI2C::write(USL, 0xc9);
owenbrotherwood 1:f6fed00a3ff2 41 MicroBitI2C::write(LSL, 0x83);
owenbrotherwood 1:f6fed00a3ff2 42 MicroBitI2C::write(TL, 0xb5);
owenbrotherwood 1:f6fed00a3ff2 43 MicroBitI2C::write(ECR, 0x8f);
owenbrotherwood 0:fb4572fc4901 44 return;
owenbrotherwood 0:fb4572fc4901 45 }
owenbrotherwood 0:fb4572fc4901 46
owenbrotherwood 1:f6fed00a3ff2 47 void MicroBitMpr121::enable(void)
owenbrotherwood 0:fb4572fc4901 48 {
owenbrotherwood 0:fb4572fc4901 49 _button = 0;
owenbrotherwood 0:fb4572fc4901 50 _button_has_changed = 0;
owenbrotherwood 1:f6fed00a3ff2 51 MicroBitI2C::write(ECR, 0x8f);
owenbrotherwood 1:f6fed00a3ff2 52 _irq->fall(this, &MicroBitMpr121::handler);
owenbrotherwood 0:fb4572fc4901 53 return;
owenbrotherwood 0:fb4572fc4901 54 }
owenbrotherwood 0:fb4572fc4901 55
owenbrotherwood 1:f6fed00a3ff2 56 void MicroBitMpr121::disable(void)
owenbrotherwood 0:fb4572fc4901 57 {
owenbrotherwood 0:fb4572fc4901 58 _irq->fall(NULL);
owenbrotherwood 0:fb4572fc4901 59 _button = 0;
owenbrotherwood 0:fb4572fc4901 60 _button_has_changed = 0;
owenbrotherwood 1:f6fed00a3ff2 61 MicroBitI2C::write(ECR, 0x0);
owenbrotherwood 1:f6fed00a3ff2 62 MicroBitI2C::write(AUTO_CFG0, 0x0);
owenbrotherwood 1:f6fed00a3ff2 63 MicroBitI2C::write(AUTO_CFG1, 0x0);
owenbrotherwood 0:fb4572fc4901 64 return;
owenbrotherwood 0:fb4572fc4901 65 }
owenbrotherwood 0:fb4572fc4901 66
owenbrotherwood 1:f6fed00a3ff2 67 uint32_t MicroBitMpr121::isPressed(void)
owenbrotherwood 0:fb4572fc4901 68 {
owenbrotherwood 0:fb4572fc4901 69 return _button_has_changed;
owenbrotherwood 0:fb4572fc4901 70 }
owenbrotherwood 0:fb4572fc4901 71
owenbrotherwood 1:f6fed00a3ff2 72 uint16_t MicroBitMpr121::buttonPressed(void)
owenbrotherwood 0:fb4572fc4901 73 {
owenbrotherwood 0:fb4572fc4901 74 _button_has_changed = 0;
owenbrotherwood 0:fb4572fc4901 75 return _button;
owenbrotherwood 0:fb4572fc4901 76 }
owenbrotherwood 0:fb4572fc4901 77
owenbrotherwood 1:f6fed00a3ff2 78 void MicroBitMpr121::registerDump() const
owenbrotherwood 0:fb4572fc4901 79 {
owenbrotherwood 0:fb4572fc4901 80 uint8_t reg_val = 0;
owenbrotherwood 1:f6fed00a3ff2 81
owenbrotherwood 1:f6fed00a3ff2 82 for(int i=0; i<0x80; i++) {
owenbrotherwood 1:f6fed00a3ff2 83 reg_val = MicroBitMpr121::read(static_cast<MPR121_REGISTER>(i));
owenbrotherwood 1:f6fed00a3ff2 84 printf("Reg 0x%02x: 0x%02x \n", i, reg_val);
owenbrotherwood 0:fb4572fc4901 85 }
owenbrotherwood 1:f6fed00a3ff2 86
owenbrotherwood 0:fb4572fc4901 87 return;
owenbrotherwood 0:fb4572fc4901 88 }
owenbrotherwood 0:fb4572fc4901 89
owenbrotherwood 1:f6fed00a3ff2 90 void MicroBitMpr121::handler(void)
owenbrotherwood 0:fb4572fc4901 91 {
owenbrotherwood 0:fb4572fc4901 92 uint16_t reg_val = 0, oor_val = 0;
owenbrotherwood 1:f6fed00a3ff2 93 reg_val = MicroBitMpr121::read(ELE0_7_STAT);
owenbrotherwood 1:f6fed00a3ff2 94 reg_val |= MicroBitMpr121::read(ELE8_11_STAT) << 8;
owenbrotherwood 1:f6fed00a3ff2 95 oor_val = MicroBitMpr121::read(ELE0_7_OOR_STAT);
owenbrotherwood 1:f6fed00a3ff2 96 oor_val |= MicroBitMpr121::read(ELE8_11_OOR_STAT) << 8;
owenbrotherwood 1:f6fed00a3ff2 97 if((0 != oor_val) && DEBUG) {
owenbrotherwood 1:f6fed00a3ff2 98 printf("MPR121 OOR failure - 0x%04x\n", oor_val);
owenbrotherwood 0:fb4572fc4901 99 wait(0.1f);
owenbrotherwood 0:fb4572fc4901 100 NVIC_SystemReset();
owenbrotherwood 0:fb4572fc4901 101 }
owenbrotherwood 0:fb4572fc4901 102 _button = reg_val;
owenbrotherwood 0:fb4572fc4901 103 _button_has_changed = 1;
owenbrotherwood 0:fb4572fc4901 104 return;
owenbrotherwood 0:fb4572fc4901 105 }
owenbrotherwood 0:fb4572fc4901 106
owenbrotherwood 1:f6fed00a3ff2 107 void MicroBitI2C::write(MPR121_REGISTER const reg, uint8_t const data) const
owenbrotherwood 0:fb4572fc4901 108 {
owenbrotherwood 0:fb4572fc4901 109 char buf[2] = {reg, data};
owenbrotherwood 0:fb4572fc4901 110 uint8_t result = 0;
owenbrotherwood 0:fb4572fc4901 111 result = _i2c->write(_i2c_addr, buf, 2);
owenbrotherwood 1:f6fed00a3ff2 112 if(result && DEBUG) {
owenbrotherwood 1:f6fed00a3ff2 113 printf("I2c write failed\n");
owenbrotherwood 0:fb4572fc4901 114 }
owenbrotherwood 0:fb4572fc4901 115 return;
owenbrotherwood 0:fb4572fc4901 116 }
owenbrotherwood 0:fb4572fc4901 117
owenbrotherwood 1:f6fed00a3ff2 118 uint8_t MicroBitMpr121::read(MPR121_REGISTER const reg) const
owenbrotherwood 0:fb4572fc4901 119 {
owenbrotherwood 0:fb4572fc4901 120 char buf[1] = {reg}, data = 0;
owenbrotherwood 0:fb4572fc4901 121 uint8_t result = 1;
owenbrotherwood 1:f6fed00a3ff2 122 result &= _i2c->write(_i2c_addr, buf, 1, true); //TODO: Correct with true?
owenbrotherwood 1:f6fed00a3ff2 123 result &= _i2c->read(_i2c_addr, &data, 1);
owenbrotherwood 1:f6fed00a3ff2 124 if(result && DEBUG) {
owenbrotherwood 1:f6fed00a3ff2 125 printf("I2c read failed\n");
owenbrotherwood 0:fb4572fc4901 126 }
owenbrotherwood 0:fb4572fc4901 127 return data;
owenbrotherwood 0:fb4572fc4901 128 }