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ergodox-firmware/src/ergodox/teensy-2-0--mcp23018.c

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/* ----------------------------------------------------------------------------
* ergodox controller (Teensy 2.0 and MCP23018) specific stuff
* - public things are prefixed by `controller_` or `CONTROLLER_`
* ----------------------------------------------------------------------------
* Copyright (c) 2012 Ben Blazak
* Released under The MIT License (MIT) (see "license.md") at
* <https://github.com/benblazak/ergodox-firmware>
* ------------------------------------------------------------------------- */
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ~~~ documentation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
/* ----------------------------------------------------------------------------
* Pinouts and Pin assignments
* - '+' indicates pin
* - 'o' indicates unused pin
* - '-'s inserted between some of the pin functions for readability
* - 'OC**' pins enclosed in parenthesis had lines over them in the pinout
* ----------------------------------------------------------------------------
* ----------------------------------------------------------------------------
* Teensy 2.0
* ========== GND +---.....---+ VCC
* SS PB0 + + PF0 ADC0
* SCLK PB1 + + PF1 ADC1
* MOSI PB2 + + PF4 ADC4
* MISO PB3 + + + + PF5 ADC5
* RTS OC1C OC0A --------- PB7 + PE6 AREF + PF6 ADC6
* OC0B INT0 SCL PD0 + AIN0 + PF7 ADC7
* INT1 SDA PD1 + INT6 + PB6 ADC13 OC1B OC4B
* RXD1 ----------- INT2 --- PD2 + + PB5 ADC12 OC1A (OC4B)
* TXD1 ----------- INT3 --- PD3 + + PB4 ADC11
* OC3A (OC4A) -------- PC6 + + PD7 ADC10 T0 -- OC4D
* ICP3 ----- OC4A --------- PC7 +-+-+-+-+-+-+ PD6 ADC9 T1 - (OC4D) onboardLED
* CTS XCK1 PD5 --/ | | | \-- PD4 ADC8 ------------ ICP1
* VCC ------------------/ | \-------------- RST
* GND --------------------/
* ----------------------------------------------------------------------------
* MCP23018
* ======== Vss(GND) +01---.---28+ NC
* NC +02 27+ GPA7
* GPB0 +03 26+ GPA6
* GPB1 +04 25+ GPA5
* GPB2 +05 24+ GPA4
* GPB3 +06 23+ GPA3
* GPB4 +07 22+ GPA2
* GPB5 +08 21+ GPA1
* GPB6 +09 20+ GPA0
* GPB7 +10 19+ INTA
* Vdd(Vcc) +11 18+ INTB
* SCL +12 17+ NC
* SDA +13 16+ RESET
* NC +14-------15+ ADDR
* ----------------------------------------------------------------------------
* ----------------------------------------------------------------------------
* Teensy 2.0 Pin Assignments
* ==========================
* power_negative GND +---.....---+ Vcc power_positive
* column6 PB0 + + PF0 row6
* o + PF1 row7
* o + PF4 row8
* o o o + PF5 row9
* LED3 OC1C + + PF6 rowA
* I2C SCL + + PF7 rowB
* I2C SDA + + OC1B LED2
* column3 PD2 + + OC1A LED1
* column4 PD3 + + PB4 column0
* column1 PC6 + + PD7 column5
* column2 PC7 +-o-o-o-o-o-o
*
* notes:
* - SCL and SDA: Need external pull-up resistors. Sometimes the internal
* pull-ups are enough (see datasheet section 20.5.1), but i think for this
* project we'll want external ones, in case people want to separate the
* halves very far.
* ----------------------------------------------------------------------------
* MCP32018 Pin Assignments
* ========================
* power_negative Vss(GND) +01---.---28o
* o02 27o
* column0 GPB0 +03 26o
* column1 GPB1 +04 25+ GPA5 rowB
* column2 GPB2 +05 24+ GPA4 rowA
* column3 GPB3 +06 23+ GPA3 row9
* column4 GPB4 +07 22+ GPA2 row8
* column5 GPB5 +08 21+ GPA1 row7
* column6 GPB6 +09 20+ GPA0 row6
* o10 19o
* power_positive Vdd(Vcc) +11 18o
* I2C SCL +12 17o
* I2C SDA +13 16o
* o14-------15+ ADDR (see note)
*
* notes:
* - ADDR (pin15): Set slave address to 0b0100000 by connecting to Vss(GND).
* (The user-defined bits are the three least significant).
* ------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------------
* Notes about Registers
* ----------------------------------------------------------------------------
* General I/O (see datasheet section 10.2.1)
*
* DDRxn function PINxn function
* 1 output 1 drive high
* 0 drive low
* 0 input 1 internal pull-up on
* 0 internal pull-up off
*
* notes:
* - Unused pins should be set as input with internal pullup enabled (see
* datasheet section 10.2.6).
* ----------------------------------------------------------------------------
* PWM on ports OC1(A|B|C) (see datasheet section 14.10)
*
* notes:
* - PWM pins should be set as outputs.
* - we want Waveform Generation Mode 15
* (fast PWM, TOP = OCRnA)
* (see table 14-5)
* - set (TCCRB[4,3],TCCRA[1,0]) to (1,1,1,1)
* - we want "Compare Output Mode, Fast PWM" to be 0b10
* "Clear OCnA/OCnB/OCnC on compare match, set OCnA/OCnB/OCnC at TOP"
* (see table 14-3)
* this way higher values of OCR1(A|B|C) will mean longer 'on' times for the
* LEDs
* - when in a fast PWM mode, set (TCCR1A[7,6,5,4,3,2]) to (1,0,1,0,1,0)
* - we want "Clock Select Bit Description" to be 0b001
* "clkI/O/1 (No prescaling)"
* (see table 14-6)
* - set (TCCR1B[2,1,0]) to (0,0,1)
* - LEDs will be at minimum brightness until OCR1(A|B|C) are changed (since
* the default value of all the bits in those registers is 0)
*
* abbreviations:
* - OCR = Output Compare Register
* - TCCR = Timer/Counter Control Register
* ------------------------------------------------------------------------- */
#include "lib/twi.h"
#include "teensy-2-0--mcp23018.h"
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ~~~ macros ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
// processor frequency (from <http://www.pjrc.com/teensy/prescaler.html>)
#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
#define CPU_16MHz 0x00
#define CPU_8MHz 0x01
#define CPU_4MHz 0x02
#define CPU_2MHz 0x03
#define CPU_1MHz 0x04
#define CPU_500kHz 0x05
#define CPU_250kHz 0x06
#define CPU_125kHz 0x07
#define CPU_62kHz 0x08
// TWI frequency
#define TWI_FREQ 400000 // (see lib/twi.(h|c))
// pins
// --- rows ?TODO
// --- columns ?TODO
// mcp23018 pins
// TODO
// I2C SCL
// I2C SDA
// ROW_6 GPA0
// ROW_7 GPA1
// ROW_8 GPA2
// ROW_9 GPA3
// ROW_A GPA4
// ROW_B GPA5
// COLUMN_0_LH GPB0
// COLUMN_1_LH GPB1
// COLUMN_2_LH GPB2
// COLUMN_3_LH GPB3
// COLUMN_4_LH GPB4
// COLUMN_5_LH GPB5
// COLUMN_6_LH GPB6
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ~~~ functions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void controller_init() {
teensy_init(); // must be first
mcp23018_init(); // must be second
}
void teensy_init() {
CPU_PRESCALE(CPU_16MHz); // speed should match F_CPU in makefile
// unused pins
DDRB &= ~0b00001110; // set B(1,2,3) as input
PORTB |= 0b00001110; // set B(1,2,3) internal pull-up enabled
DDRD &= ~0b01110000; // set D(4,5,6) as input
PORTD |= 0b01110000; // set D(4,5,6) internal pull-up enabled
DDRE &= ~0b01000000; // set E(6) as input
PORTE |= 0b01000000; // set E(6) internal pull-up enabled
// LEDs
DDRB |= 0b11100000; // set B(5,6,7) as output
TCCR1A = 0b10101011; // set and configure fast PWM
TCCR1B = 0b00011001; // set and configure fast PWM
// rows
DDRF |= 0b11110011; // set F(0,1,4,5,6,7) as output
PORTF |= 0b11110011; // set F(0,1,4,5,6,7) drive high
// columns
DDRB &= ~0b00010001; // set B(0,4) as input
PORTB |= 0b00010001; // set B(0,4) internal pull-up enabled
DDRC &= ~0b11000000; // set C(6,7) as input
PORTC |= 0b11000000; // set C(6,7) internal pull-up enabled
DDRD &= ~0b10001100; // set D(2,3,7) as input
PORTD |= 0b10001100; // set D(2,3,7) internal pull-up enabled
// I2C (TWI)
twi_init(); // (on pins D(0,1))
twi_setAddress(0b0100000);
}
// TODO
void mcp23018_init() {
}
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