Maxim Integrated / MAXREFDES1265

Firmware for MAXREFES1265

Dependencies:   max32625pico SerialInterface maxim-dev USBDevice

MAXREFDES1265 Numeric keypad interface using MAX7360 and MAX32625PICO

Description: MAX7360 is an I2C interfaced key switch controller when integrated with a microcontroller it can be used to control the numeric keypad

Operation: This code was developed in a such a way that initially all the registers in MAX7360 gets initialized and based upon the key press the data gets displayed on Serial monitor

main.cpp@1:6dcb933b366d, 2020-05-05 (annotated)

Committer:
brianh
Date:
Tue May 05 17:47:25 2020 +0000
Revision:
1:6dcb933b366d
Parent:
0:4a433af35131 
Changed from Blinky readme to project readme.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
venkik 0:4a433af35131 1 /*******************************************************************************
venkik 0:4a433af35131 2 * Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
venkik 0:4a433af35131 3 *
venkik 0:4a433af35131 4 * Permission is hereby granted, free of charge, to any person obtaining a
venkik 0:4a433af35131 5 * copy of this software and associated documentation files (the "Software"),
venkik 0:4a433af35131 6 * to deal in the Software without restriction, including without limitation
venkik 0:4a433af35131 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
venkik 0:4a433af35131 8 * and/or sell copies of the Software, and to permit persons to whom the
venkik 0:4a433af35131 9 * Software is furnished to do so, subject to the following conditions:
venkik 0:4a433af35131 10 *
venkik 0:4a433af35131 11 * The above copyright notice and this permission notice shall be included
venkik 0:4a433af35131 12 * in all copies or substantial portions of the Software.
venkik 0:4a433af35131 13 *
venkik 0:4a433af35131 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
venkik 0:4a433af35131 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
venkik 0:4a433af35131 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
venkik 0:4a433af35131 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
venkik 0:4a433af35131 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
venkik 0:4a433af35131 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
venkik 0:4a433af35131 20 * OTHER DEALINGS IN THE SOFTWARE.
venkik 0:4a433af35131 21 *
venkik 0:4a433af35131 22 * Except as contained in this notice, the name of Maxim Integrated
venkik 0:4a433af35131 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
venkik 0:4a433af35131 24 * Products, Inc. Branding Policy.
venkik 0:4a433af35131 25 *
venkik 0:4a433af35131 26 * The mere transfer of this software does not imply any licenses
venkik 0:4a433af35131 27 * of trade secrets, proprietary technology, copyrights, patents,
venkik 0:4a433af35131 28 * trademarks, maskwork rights, or any other form of intellectual
venkik 0:4a433af35131 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
venkik 0:4a433af35131 30 * ownership rights.
venkik 0:4a433af35131 31 *******************************************************************************/
venkik 0:4a433af35131 32 //==============================================================================
venkik 0:4a433af35131 33 //This code is only suitable for single switch press not simultaneous switch press
venkik 0:4a433af35131 34 //The following code needs maxim-dev library to run. The complete package is available in the GITHUB
venkik 0:4a433af35131 35 //==============================================================================
venkik 0:4a433af35131 36 //Header files
venkik 0:4a433af35131 37 #include "mbed.h"
venkik 0:4a433af35131 38 #include "USBSerial.h"
venkik 0:4a433af35131 39 #include "max32625pico.h"
venkik 0:4a433af35131 40 #include "SerialInterface.h"
venkik 0:4a433af35131 41
venkik 0:4a433af35131 42
venkik 0:4a433af35131 43 const int Slave_address = 0x70; // MAX7360 I2C slave address
venkik 0:4a433af35131 44 const int max_key = 63;
venkik 0:4a433af35131 45
venkik 0:4a433af35131 46 // Virtual serial port over USB
venkik 0:4a433af35131 47 USBSerial microUSB(0x0B6A, 0x4360);
venkik 0:4a433af35131 48
venkik 0:4a433af35131 49 DigitalIn nINTK(P4_5); // Key switch interrupt configures as GPIO, refer to page 11 of DS for more info
venkik 0:4a433af35131 50
venkik 0:4a433af35131 51 //The following line of code is optional and please uncomment if you are using rotary encoder
venkik 0:4a433af35131 52 //DigitalIn nINTI(P4_4); // Interrupt for rotary switch configuration, refer to page 14 for more info
venkik 0:4a433af35131 53
venkik 0:4a433af35131 54 //The following line of code sets all the GPIO to 1.8 volts
venkik 0:4a433af35131 55 MAX32625PICO pico(MAX32625PICO::IOH_DIP_IN, MAX32625PICO::VIO_IOH, MAX32625PICO::VIO_1V8);
venkik 0:4a433af35131 56
venkik 0:4a433af35131 57 // Serial Interfaces
venkik 0:4a433af35131 58 I2C i2c(P1_6, P1_7);
venkik 0:4a433af35131 59
venkik 0:4a433af35131 60
venkik 0:4a433af35131 61
venkik 0:4a433af35131 62 int main()
venkik 0:4a433af35131 63 {
venkik 0:4a433af35131 64
venkik 0:4a433af35131 65
venkik 0:4a433af35131 66 //--------Register configuration for the MAX7360--------------------------------
venkik 0:4a433af35131 67 //Please refer to page 10 and table 8 of the data sheet
venkik 0:4a433af35131 68
venkik 0:4a433af35131 69 //Writing the configuration register (0x01) of MAX7360.
venkik 0:4a433af35131 70
venkik 0:4a433af35131 71
venkik 0:4a433af35131 72 char Datawrite_config[2];
venkik 0:4a433af35131 73 Datawrite_config[0] = 0x01; //Address of the register
venkik 0:4a433af35131 74 Datawrite_config[1] = 0x20; //Configuring the register for Interrupt by making D5 to 1 and all the other bits to 0
venkik 0:4a433af35131 75 i2c.write( Slave_address, Datawrite_config, 2 );
venkik 0:4a433af35131 76
venkik 0:4a433af35131 77 //Writing the Key switch interrupt register (0x03) MAX7360.
venkik 0:4a433af35131 78 //Please refer to table 10 of the data sheet
venkik 0:4a433af35131 79 //The interrupt register contains information related to the
venkik 0:4a433af35131 80 //settings of the interrupt request function, as well as the
venkik 0:4a433af35131 81 //status of the INTK output, which can also be configured
venkik 0:4a433af35131 82 //as a GPIO
venkik 0:4a433af35131 83 char Datawrite_Key_Switch_Interrupt[2];
venkik 0:4a433af35131 84 Datawrite_Key_Switch_Interrupt[0] = 0x03; //Address of the register
venkik 0:4a433af35131 85 Datawrite_Key_Switch_Interrupt[1] = 0x08; //Configuring the TIME-BASED INTK bits to get 8 debounce cycles
venkik 0:4a433af35131 86 i2c.write( Slave_address, Datawrite_Key_Switch_Interrupt, 2 );
venkik 0:4a433af35131 87
venkik 0:4a433af35131 88
venkik 0:4a433af35131 89 //Writing the auto sleep register (0x06)MAX7360 Autosleep Register no autosleep
venkik 0:4a433af35131 90 char Autosleep[2];
venkik 0:4a433af35131 91 Autosleep[0] = 0x06; //Address of the register
venkik 0:4a433af35131 92 Autosleep[1] = 0x00; //AUTOSHUTDOWN TIME to no autosleep, refer to page 25 of DS
venkik 0:4a433af35131 93 i2c.write( Slave_address, Autosleep, 2 );
venkik 0:4a433af35131 94
venkik 0:4a433af35131 95
venkik 0:4a433af35131 96 //Writing the GPIO Global Configuration (0x40)
venkik 0:4a433af35131 97 //Enable rotary encoder and normal GPIO operation
venkik 0:4a433af35131 98 char GlobalConfig[2];
venkik 0:4a433af35131 99 GlobalConfig[0] = 0x40; //Address of the register
venkik 0:4a433af35131 100 GlobalConfig[1] = 0x90; //Enabling the I2C timeout interrupt and rotary switch by setting D7 and D5 to 1 and all others to zero
venkik 0:4a433af35131 101 i2c.write( Slave_address, GlobalConfig, 2 );
venkik 0:4a433af35131 102
venkik 0:4a433af35131 103 //==============================================================================
venkik 0:4a433af35131 104 //Uncomment below if you would like ot use rotary encoder
venkik 0:4a433af35131 105 //==============================================================================
venkik 0:4a433af35131 106 //Writing GPIO Control Register
venkik 0:4a433af35131 107 // char GPIOControl[2];
venkik 0:4a433af35131 108 // GPIOControl[0] = 0x41; //Address
venkik 0:4a433af35131 109 // GPIOControl[1] = 0x3F; //Registrer configuration, All GPIOs configured as output, except ports 6 and 7, because they are connected to the rotary encoder
venkik 0:4a433af35131 110 // i2c.write( Slave_address, GPIOControl, 2 );
venkik 0:4a433af35131 111 //Writing the Rotatory switch configuration (0x46). Please refer to table 20 of the data sheet
venkik 0:4a433af35131 112 // char Datawrite_Rotatory_Switch_configuration[2];
venkik 0:4a433af35131 113 //Rotary Switch Configuration Register nINTI asserted 25ms after first debounced event, no debounce cycle time
venkik 0:4a433af35131 114 // Datawrite_Rotatory_Switch_configuration[0] = 0x46;
venkik 0:4a433af35131 115 // Datawrite_Rotatory_Switch_configuration[1] = 0x90; // Rotary Switch Configuration Register nINTI asserted 25ms after first debounced event, no debounce cycle time
venkik 0:4a433af35131 116 //Datawrite_Rotatory_Switch_configuration[1] = 0x11;
venkik 0:4a433af35131 117 // i2c.write( Slave_address, Datawrite_Rotatory_Switch_configuration, 2 );
venkik 0:4a433af35131 118
venkik 0:4a433af35131 119 /*
venkik 0:4a433af35131 120 // Writing PORT6 Configuration Register mask interrupt (0x5E)
venkik 0:4a433af35131 121 char Port6[2];
venkik 0:4a433af35131 122 Port6[0] = 0x5E; // Address
venkik 0:4a433af35131 123 Port6[1] = 0x80;// masking the interrupt by enabling the D7 to 1 refer to page 30 of DS
venkik 0:4a433af35131 124 i2c.write( Slave_address, Port6, 2 );
venkik 0:4a433af35131 125
venkik 0:4a433af35131 126 // Writing PORT7 Configuration Register mask interrupt (0x5F)
venkik 0:4a433af35131 127 char Port7[2];
venkik 0:4a433af35131 128 Port7[0] = 0x5F; //Address
venkik 0:4a433af35131 129 Port7[1] = 0x80; // masking of the interrupt by making D7 to 1 refer to page 30 of DS
venkik 0:4a433af35131 130 i2c.write( Slave_address, Port7, 2 );
venkik 0:4a433af35131 131 */
venkik 0:4a433af35131 132 //-----------------------------------------------------------------------------
venkik 0:4a433af35131 133 //Default register values
venkik 0:4a433af35131 134 //-----------------------------------------------------------------------------
venkik 0:4a433af35131 135 //writeMAX7360(0x02,0xFF);// Debounce Register only column 0 enabled, debounce set to 40ms
venkik 0:4a433af35131 136 // writeMAX7360(0x04,0xFE); // Ports Register
venkik 0:4a433af35131 137 // writeMAX7360(0x05,0x00); // Autorepeat Register
venkik 0:4a433af35131 138 // writeMAX7360(0x42,0x00); // GPIO Debounce Configuration Register
venkik 0:4a433af35131 139 // writeMAX7360(0x43,0xC0); // GPIO Constant-Current Setting Register
venkik 0:4a433af35131 140 // writeMAX7360(0x44,0x00); // GPIO Output Mode Register
venkik 0:4a433af35131 141 // writeMAX7360(0x45,0x00); // Common PWM Register
venkik 0:4a433af35131 142
venkik 0:4a433af35131 143 //------------------End of Register configuration for MAX7360-----------------//
venkik 0:4a433af35131 144
venkik 0:4a433af35131 145
venkik 0:4a433af35131 146 while(1) {
venkik 0:4a433af35131 147
venkik 0:4a433af35131 148
venkik 0:4a433af35131 149
venkik 0:4a433af35131 150 //Reading the Key FIFO register (0x00) from MAX7360.
venkik 0:4a433af35131 151 //Please refer to page 10 and table 7 of the data sheet
venkik 0:4a433af35131 152 char KeyFIFOData;
venkik 0:4a433af35131 153 char l = 0x00;
venkik 0:4a433af35131 154 i2c.write( Slave_address, &l, 1 );
venkik 0:4a433af35131 155 i2c.read( Slave_address, &KeyFIFOData, 1 );
venkik 0:4a433af35131 156
venkik 0:4a433af35131 157
venkik 0:4a433af35131 158 if(KeyFIFOData!= max_key) {
venkik 0:4a433af35131 159 microUSB.printf("KeyFIFOData = %d \n\r", KeyFIFOData);
venkik 0:4a433af35131 160 }
venkik 0:4a433af35131 161
venkik 0:4a433af35131 162 // wait_ms(50); This may be necessary for console printing
venkik 0:4a433af35131 163
venkik 0:4a433af35131 164 //==============================================================================
venkik 0:4a433af35131 165 //Uncomment the code below for rotary encoder
venkik 0:4a433af35131 166 //==============================================================================
venkik 0:4a433af35131 167 ////Reading the Rotatory switch count register (0x4A). Please refer to page 12 and table 23 of the data sheet
venkik 0:4a433af35131 168 //
venkik 0:4a433af35131 169 // char RotaryData;
venkik 0:4a433af35131 170 // char m = 0x4A;
venkik 0:4a433af35131 171 // if(!nINTI) {
venkik 0:4a433af35131 172 // i2c.write( Slave_address, &m, 1 );
venkik 0:4a433af35131 173 // i2c.read( Slave_address, &RotaryData, 1 );
venkik 0:4a433af35131 174 //
venkik 0:4a433af35131 175 // if(RotaryData!= 0) {
venkik 0:4a433af35131 176 //
venkik 0:4a433af35131 177 // microUSB.printf("RotaryData = %x \r\n", RotaryData);
venkik 0:4a433af35131 178 // }
venkik 0:4a433af35131 179 //
venkik 0:4a433af35131 180 // // wait_ms(100); This may be necessary for console printing
venkik 0:4a433af35131 181 //
venkik 0:4a433af35131 182 // }
venkik 0:4a433af35131 183
venkik 0:4a433af35131 184 }
venkik 0:4a433af35131 185 }
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