117 lines
5.3 KiB
C
117 lines
5.3 KiB
C
/* ----------------------------------------------------------------------------
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* Teensy 2.0 specific stuff
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* ----------------------------------------------------------------------------
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* Copyright (c) 2012 Ben Blazak
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* Released under The MIT License (MIT) (see "license.md") at
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* <https://github.com/benblazak/ergodox-firmware>
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* ------------------------------------------------------------------------- */
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/* ----------------------------------------------------------------------------
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* Pinouts and Pin assignments
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* - '+' indicates pin
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* - 'o' indicates unused pin
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* - '-'s inserted between some of the pin names for readability
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* - 'OC**' pins enclosed in parenthesis had lines over them in the pinout
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* ----------------------------------------------------------------------------
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* ----------------------------------------------------------------------------
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* Teensy 2.0
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* ========== GND +---.....---+ VCC
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* SS PB0 + + PF0 ADC0
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* SCLK PB1 + + PF1 ADC1
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* MOSI PB2 + + PF4 ADC4
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* MISO PB3 + + + + PF5 ADC5
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* RTS OC1C OC0A --------- PB7 + PE6 AREF + PF6 ADC6
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* OC0B INT0 SCL PD0 + AIN0 + PF7 ADC7
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* INT1 SDA PD1 + INT6 + PB6 ADC13 OC1B OC4B
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* RXD1 ----------- INT2 --- PD2 + + PB5 ADC12 OC1A (OC4B)
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* TXD1 ----------- INT3 --- PD3 + + PB4 ADC11
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* OC3A (OC4A) -------- PC6 + + PD7 ADC10 T0 -- OC4D
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* ICP3 ----- OC4A --------- PC7 +-+-+-+-+-+-+ PD6 ADC9 T1 - (OC4D) onboardLED
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* CTS XCK1 PD5 --/ | | | \-- PD4 ADC8 ------------ ICP1
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* VCC ------------------/ | \-------------- RST
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* GND --------------------/
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* ----------------------------------------------------------------------------
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* MCP23018
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* ======== Vss(GND) +01---.---28+ NC
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* GPNC +02 27+ GPAC
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* GPB0 +03 26+ GPA6
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* GPB1 +04 25+ GPAC
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* GPB2 +05 24+ GPAC
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* GPB3 +06 23+ GPAC
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* GPB4 +07 22+ GPAC
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* GPB5 +08 21+ GPAC
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* GPB6 +09 20+ GPAC
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* GPB7 +10 19+ INTC
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* Vdd(Vcc) +11 18+ INTC
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* SCL +12 17+ NC
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* SDA +13 16+ RESET
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* NC +14-------15+ ADDR
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* ----------------------------------------------------------------------------
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* ----------------------------------------------------------------------------
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* Teensy 2.0 Pin Assignments
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* ==========================
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* power_negative GND +---.....---+ Vcc power_positive
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* column6 PB0 + + PF0 row0
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* o + PF1 row1
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* o + PF4 row2
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* o o o + PF5 row3
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* LED3 OC1C + + PF6 row4
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* I2C SCL + + PF7 row5
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* I2C SDA + + OC1B LED2
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* column3 PD2 + + OC1A LED1
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* column4 PD3 + + PB4 column0
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* column1 PC6 + + PD7 column5
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* column2 PC7 +-o-o-o-o-o-o
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* ----------------------------------------------------------------------------
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* MCP32018 Pin Assignments
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* ========================
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* power_negative Vss(GND) +01---.---28o
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* o02 27o
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* column0 GPB0 +03 26o
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* column1 GPB1 +04 25+ GPA5 row5
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* column2 GPB2 +05 24+ GPA4 row4
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* column3 GPB3 +06 23+ GPA3 row3
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* column4 GPB4 +07 22+ GPA2 row2
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* column5 GPB5 +08 21+ GPA1 row1
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* column6 GPB6 +09 20+ GPA0 row0
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* o10 19o
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* power_positive Vdd(Vcc) +11 18o
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* I2C SCL +12 17o
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* I2C SDA +13 16+ RESET (see note)
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* o14-------15+ ADDR (see note)
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*
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* notes:
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* - ADDR (pin15): Set to 0b000 via
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* Vdd(Vcc) -- R1 -- V2 (on ADDR) -- R2 -- Vss(GND)
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* where
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* Vdd = +5V
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* R1 = ?TODO:\
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* V2 = ?TODO: | (see mcp23018 datasheet, pg 11)
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* R2 = ?TODO:/
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* - RESET (pin16): Not used by software. Might want to have it available
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* somewhere physically just in case though?
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* ------------------------------------------------------------------------- */
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// processor frequency (from <http://www.pjrc.com/teensy/prescaler.html>)
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#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
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#define CPU_16MHz 0x00
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#define CPU_8MHz 0x01
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#define CPU_4MHz 0x02
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#define CPU_2MHz 0x03
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#define CPU_1MHz 0x04
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#define CPU_500kHz 0x05
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#define CPU_250kHz 0x06
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#define CPU_125kHz 0x07
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#define CPU_62kHz 0x08
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// pins
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// TODO: write some pretty macros
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// TODO:
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// - initialize pins
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void controller_init() {
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CPU_PRESCALE(CPU_16MHz); // speed should match F_CPU in makefile
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}
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