62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
#include "debugpins.h"
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#include "board.hpp"
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#include <avr/io.h>
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#include <avr/fuse.h>
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FUSES = {
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.WDTCFG = 0x00,
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.BODCFG = ACTIVE_DISABLE_gc,
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.OSCCFG = CLKSEL_OSCHF_gc,
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.reserved_1 = {0x00, 0x00},
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.SYSCFG0 = CRCSRC_NOCRC_gc,
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.SYSCFG1 = MVSYSCFG_DUAL_gc,
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.CODESIZE = 0x00,
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.BOOTSIZE = 0x00
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};
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void board_pins_init()
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{
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// We have a lot of analog inputs. Just disable ALL input buffers, then
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// go back and enable the ones we care about.
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PORTA.PINCONFIG = PORT_ISC_INPUT_DISABLE_gc; // Mirrored to all PORTx
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PORTA.PINCTRLUPD = 0xFF;
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PORTB.PINCTRLUPD = 0xFF;
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PORTC.PINCTRLUPD = 0xFF;
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PORTD.PINCTRLUPD = 0xFF;
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PORTE.PINCTRLUPD = 0xFF;
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PORTF.PINCTRLUPD = 0xFF;
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PORTG.PINCTRLUPD = 0xFF;
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DEBUGPINS_INIT();
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// Drive all the chip selects high
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PIN_DRIVE_TO(PIN_MIXER_nCS, 1);
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PIN_DRIVE_TO(PIN_LFO_nCS, 1);
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PIN_DRIVE_TO(PIN_SD_nCS, 1);
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PIN_DRIVE_TO(PIN_nVS, 1);
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// Set the alternates and inversions (we invert usbmidi.rx to allow
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// detection of cable disconnects - because the opto is ON by default,
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// depowering the USB region will generate a break)
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//
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// USART2 -> PF4,5 and invert PF5
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// SPI0 -> PG4-7
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PORTMUX.USARTROUTEA = PORTMUX_USART2_ALT1_gc;
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PINCTRL_FOR(PIN_USBMIDI_RX) = PORT_INVEN_bm;
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PORTMUX.SPIROUTEA = PORTMUX_SPI0_ALT2_gc;
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// Set up the clocks
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DEBUGPINS_START_INIT_CLOCK();
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_PROTECTED_WRITE(CLKCTRL.XOSCHFCTRLA,
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CLKCTRL_CSUTHF_4K_gc | CLKCTRL_FRQRANGE_24M_gc
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| CLKCTRL_ENABLE_bm);
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while (!(CLKCTRL.MCLKSTATUS & CLKCTRL_EXTS_bm));
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DEBUGPINS_CLOCK_READY();
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_PROTECTED_WRITE(CLKCTRL.MCLKCTRLA, CLKCTRL_CLKSEL_EXTCLK_gc);
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_PROTECTED_WRITE(CLKCTRL.MCLKCTRLB, 0); // No prescaler
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DEBUGPINS_RUN();
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}
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