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MPR121 I2C Capacitive Touch/Proximity Sensor Library

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sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

MPR121 I2C Capacitive Touch/Proximity Sensor Library

Posted: Sun May 04, 2014 10:28 am

MPR121.h

Code:

#define MPR121addr 0x5A

#define Write_MPR121 0xB4
#define Read_MPR121 0xB5

#define ELE_L 0x00
#define ELE_H 0x01
#define OOR_STATU 0x02
#define ELEPROX 0x03
#define ELE0_L 0x04
#define ELE0_H 0x05
#define ELE1_L 0x06
#define ELE1_H 0x07
#define ELE2_L 0x08
#define ELE2_H 0x09
#define ELE3_L 0x0A
#define ELE3_H 0x0B
#define ELE4_L 0x0C
#define ELE4_H 0x0D
#define ELE5_L 0x0E
#define ELE5_H 0x0F
#define ELE6_L 0x10
#define ELE6_H 0x11
#define ELE7_L 0x12
#define ELE7_H 0x13
#define ELE8_L 0x14
#define ELE8_H 0x15
#define ELE9_L 0x16
#define ELE9_H 0x17
#define ELE10_L 0x18
#define ELE10_H 0x19
#define ELE11_L 0x1A
#define ELE11_H 0x1B
#define EFDPROX_L 0x1C
#define EFDPROX_H 0x1D
#define E0BV 0x1E
#define E1BV 0x1F
#define E2BV 0x20
#define E3BV 0x21
#define E4BV 0x22
#define E5BV 0x23
#define E6BV 0x24
#define E7BV 0x25
#define E8BV 0x26
#define E9BV 0x27
#define E10BV 0x28
#define E11BV 0x29
#define EPROXBV 0x2A
#define MHD_R 0x2B
#define NHD_R 0x2C
#define NCL_R 0x2D
#define FDL_R 0x2E
#define MHD_F 0x2F
#define NHD_F 0x30
#define NCL_F 0x31
#define FDL_F 0x32
#define NHD_T 0x33
#define NCL_T 0x34
#define FDL_T 0x35
#define MHDPROXR 0x36
#define NHDPROXR 0x37
#define NCLPROXR 0x38
#define FDLPROXR 0x39
#define MHDPROXF 0x3A
#define NHDPROXF 0x3B
#define NCLPROXF 0x3C
#define FDLPROXF 0x3D
#define NHDPROXT 0x3E
#define NCLPROXT 0x3F
#define FDLPROXT 0x40
#define ELE0_T 0x41
#define ELE0_R 0x42
#define ELE1_T 0x43
#define ELE1_R 0x44
#define ELE2_T 0x45
#define ELE2_R 0x46
#define ELE3_T 0x47
#define ELE3_R 0x48
#define ELE4_T 0x49
#define ELE4_R 0x4A
#define ELE5_T 0x4B
#define ELE5_R 0x4C
#define ELE6_T 0x4D
#define ELE6_R 0x4E
#define ELE7_T 0x4F
#define ELE7_R 0x50
#define ELE8_T 0x51
#define ELE8_R 0x52
#define ELE9_T 0x53
#define ELE9_R 0x54
#define ELE10_T 0x55
#define ELE10_R 0x56
#define ELE11_T 0x57
#define ELE11_R 0x58
#define EPROXTTH       0x59
#define EPROXRTH       0x5A
#define DEBOUNCE       0x5B
#define FIL_CFG1 0x5C
#define FIL_CFG2 0x5D
#define ELE_CFG 0x5E
#define CDC0 0x5F
#define CDC1 0x60
#define CDC2 0x61
#define CDC3 0x62
#define CDC4 0x63
#define CDC5 0x64
#define CDC6 0x65
#define CDC7 0x66
#define CDC8 0x67
#define CDC9 0x68
#define CDC10 0x69
#define CDC11 0x6A
#define CDCPROX 0x6B
#define CDT0_1 0x6C
#define CDT2_3 0x6D
#define CDT4_5 0x6E
#define CDT6_7 0x6F
#define CDT8_9 0x70
#define CDT10_11 0x71
#define CDTPROX 0x72
#define GPIO_CTRL0 0x73
#define GPIO_CTRL1 0x74
#define GPIO_DATA 0x75
#define GPIO_DIR 0x76
#define GPIO_EN 0x77
#define GPIO_SET 0x78
#define GPIO_CLEAR 0x79
#define GPIO_TOGGLE 0x7A
#define AUTO_CFG0 0x7B
#define AUTO_CFG_CTRL 0x7C
#define AUTO_CFGU 0x7D
#define AUTO_CFGL 0x7E
#define AUTO_CFGT 0x7F
#define SRST 0x80
#define TOU_THRESH 0x0F
#define REL_THRESH 0x09

#define SDA_pin pin_A0
#define SCL_pin pin_A1

#use I2C(MASTER, SDA = SDA_pin, SCL = SCL_pin)

void MPR121_init();
unsigned char MPR121_read(unsigned char address);
void MPR121_write(unsigned char address, unsigned char value);

MPR121.c

Code:

#include "MPR121.h"

void MPR121_init()
{
MPR121_write(GPIO_CTRL0, 0x00);
MPR121_write(GPIO_CTRL1, 0x00);
MPR121_write(GPIO_DIR, 0x00);
MPR121_write(GPIO_EN, 0x00);
MPR121_write(MHD_R, 0x01);
MPR121_write(NHD_R, 0x01);
MPR121_write(NCL_R, 0x00);
MPR121_write(FDL_R, 0x00);
MPR121_write(MHD_F, 0x01);
MPR121_write(NHD_F, 0x01);
MPR121_write(NCL_F, 0x7F);
MPR121_write(FDL_F, 0x09);
MPR121_write(ELE0_T, TOU_THRESH);
MPR121_write(ELE0_R, REL_THRESH);
MPR121_write(ELE1_T, TOU_THRESH);
MPR121_write(ELE1_R, REL_THRESH);
MPR121_write(ELE2_T, TOU_THRESH);
MPR121_write(ELE2_R, REL_THRESH);
MPR121_write(ELE3_T, TOU_THRESH);
MPR121_write(ELE3_R, REL_THRESH);
MPR121_write(AUTO_CFG0, 0x1B);
MPR121_write(AUTO_CFGU, 0xC9);
MPR121_write(AUTO_CFGL, 0x82);
MPR121_write(AUTO_CFGT,0xB5);
MPR121_write(ELE_CFG, 0x84);
}

unsigned char MPR121_read(unsigned char addr)
{
unsigned char value = 0;

I2C_Start();
I2C_Write(Write_MPR121);
I2C_Write(addr);
I2C_Start();
I2C_Write(Read_MPR121);
value = I2C_Read(0);
I2C_Stop();

return value;
}

void MPR121_write(unsigned char addr, unsigned char value)
{
I2C_Start();
I2C_Write(Write_MPR121);
I2C_Write(addr);
I2C_Write(value);
I2C_Stop();
}

Example Code

Code:

#include <16F630.h>
#device *= 16
#fuses INTRC_IO, PUT, PROTECT, NOWDT, NOMCLR, BROWNOUT, CPD
#use delay (clock = 4MHz)

#include "MPR121.c"

void setup();

void main()
{
unsigned char states = 0;

setup();

while(TRUE)
{
   states = MPR121_read(ELE_L);
   states &= 0x0F;
   output_C(states);
};
}

void setup()
{
disable_interrupts(global);
setup_comparator(NC_NC_NC_NC);
set_TRIS_C(0xF0);
setup_timer_0(T0_INTERNAL | T0_8_BIT);
setup_timer_1(T1_DISABLED);
set_timer0(0);
set_timer1(0);
MPR121_init();
}

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SShahryiar

ressas

Joined: 15 Nov 2019
Posts: 135


Posted: Mon Dec 30, 2019 1:15 am

Your code works for touch detection. What should be changed for proximity detection?

ressas

Joined: 15 Nov 2019
Posts: 135


Posted: Mon Dec 30, 2019 2:14 am

And the vu code only works for 4 channels. How do I make it work for twelve channels ?

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