i2c working

keyboards/lets-split/lets-split.h

@@ -1,4 +0,0 @@
-#include "quantum.h"
-#include <avr/wdt.h>
-
-void promicro_bootloader_jmp(bool program);

keyboards/lets_split/Makefile

@@ -1,4 +1,6 @@
-
+SRC += matrix.c \
+	   i2c.c \
+	   split_util.c
 
 # MCU name
 #MCU = at90usb1287
@@ -68,6 +70,8 @@ RGBLIGHT_ENABLE ?= no        # Enable WS2812 RGB underlight.  Do not enable this
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE ?= no    # Breathing sleep LED during USB suspend
 
+CUSTOM_MATRIX = yes
+
 ifndef QUANTUM_DIR
 	include ../../Makefile
 endif

keyboards/lets_split/config.h

@@ -29,12 +29,18 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define DESCRIPTION     A split keyboard for the cheap makers
 
 /* key matrix size */
-#define MATRIX_ROWS 4
+#define MATRIX_ROWS 8
 #define MATRIX_COLS 6
 
-#define MATRIX_ROW_PINS { B5, B4, E6, D7, }
+// wiring of each half
+#define MATRIX_ROW_PINS { B5, B4, E6, D7 }
 #define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
 
+#define USE_I2C
+
+// #define I2C_MASTER_LEFT
+#define I2C_MASTER_RIGHT
+
 /* COL2ROW or ROW2COL */
 #define DIODE_DIRECTION COL2ROW
 

keyboards/lets_split/i2c.c

@@ -0,0 +1,159 @@
+#include <util/twi.h>
+#include <avr/io.h>
+#include <stdlib.h>
+#include <avr/interrupt.h>
+#include <util/twi.h>
+#include <stdbool.h>
+#include "i2c.h"
+
+// Limits the amount of we wait for any one i2c transaction.
+// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
+// 9 bits, a single transaction will take around 90μs to complete.
+//
+// (F_CPU/SCL_CLOCK)  =>  # of μC cycles to transfer a bit
+// poll loop takes at least 8 clock cycles to execute
+#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8
+
+#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)
+
+volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
+
+static volatile uint8_t slave_buffer_pos;
+static volatile bool slave_has_register_set = false;
+
+// Wait for an i2c operation to finish
+inline static
+void i2c_delay(void) {
+  uint16_t lim = 0;
+  while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
+    lim++;
+
+  // easier way, but will wait slightly longer
+  // _delay_us(100);
+}
+
+// Setup twi to run at 100kHz
+void i2c_master_init(void) {
+  // no prescaler
+  TWSR = 0;
+  // Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
+  // Check datasheets for more info.
+  TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
+}
+
+// Start a transaction with the given i2c slave address. The direction of the
+// transfer is set with I2C_READ and I2C_WRITE.
+// returns: 0 => success
+//          1 => error
+uint8_t i2c_master_start(uint8_t address) {
+  TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
+
+  i2c_delay();
+
+  // check that we started successfully
+  if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
+    return 1;
+
+  TWDR = address;
+  TWCR = (1<<TWINT) | (1<<TWEN);
+
+  i2c_delay();
+
+  if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
+    return 1; // slave did not acknowledge
+  else
+    return 0; // success
+}
+
+
+// Finish the i2c transaction.
+void i2c_master_stop(void) {
+  TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
+
+  uint16_t lim = 0;
+  while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
+    lim++;
+}
+
+// Write one byte to the i2c slave.
+// returns 0 => slave ACK
+//         1 => slave NACK
+uint8_t i2c_master_write(uint8_t data) {
+  TWDR = data;
+  TWCR = (1<<TWINT) | (1<<TWEN);
+
+  i2c_delay();
+
+  // check if the slave acknowledged us
+  return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
+}
+
+// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
+// if ack=0 the acknowledge bit is not set.
+// returns: byte read from i2c device
+uint8_t i2c_master_read(int ack) {
+  TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);
+
+  i2c_delay();
+  return TWDR;
+}
+
+void i2c_reset_state(void) {
+  TWCR = 0;
+}
+
+void i2c_slave_init(uint8_t address) {
+  TWAR = address << 0; // slave i2c address
+  // TWEN  - twi enable
+  // TWEA  - enable address acknowledgement
+  // TWINT - twi interrupt flag
+  // TWIE  - enable the twi interrupt
+  TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
+}
+
+ISR(TWI_vect);
+
+ISR(TWI_vect) {
+  uint8_t ack = 1;
+  switch(TW_STATUS) {
+    case TW_SR_SLA_ACK:
+      // this device has been addressed as a slave receiver
+      slave_has_register_set = false;
+      break;
+
+    case TW_SR_DATA_ACK:
+      // this device has received data as a slave receiver
+      // The first byte that we receive in this transaction sets the location
+      // of the read/write location of the slaves memory that it exposes over
+      // i2c.  After that, bytes will be written at slave_buffer_pos, incrementing
+      // slave_buffer_pos after each write.
+      if(!slave_has_register_set) {
+        slave_buffer_pos = TWDR;
+        // don't acknowledge the master if this memory loctaion is out of bounds
+        if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
+          ack = 0;
+          slave_buffer_pos = 0;
+        }
+        slave_has_register_set = true;
+      } else {
+        i2c_slave_buffer[slave_buffer_pos] = TWDR;
+        BUFFER_POS_INC();
+      }
+      break;
+
+    case TW_ST_SLA_ACK:
+    case TW_ST_DATA_ACK:
+      // master has addressed this device as a slave transmitter and is
+      // requesting data.
+      TWDR = i2c_slave_buffer[slave_buffer_pos];
+      BUFFER_POS_INC();
+      break;
+
+    case TW_BUS_ERROR: // something went wrong, reset twi state
+      TWCR = 0;
+    default:
+      break;
+  }
+  // Reset everything, so we are ready for the next TWI interrupt
+  TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
+}

keyboards/lets_split/i2c.h

@@ -0,0 +1,31 @@
+#ifndef I2C_H
+#define I2C_H
+
+#include <stdint.h>
+
+#ifndef F_CPU
+#define F_CPU 16000000UL
+#endif
+
+#define I2C_READ 1
+#define I2C_WRITE 0
+
+#define I2C_ACK 1
+#define I2C_NACK 0
+
+#define SLAVE_BUFFER_SIZE 0x10
+
+// i2c SCL clock frequency
+#define SCL_CLOCK  100000L
+
+extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
+
+void i2c_master_init(void);
+uint8_t i2c_master_start(uint8_t address);
+void i2c_master_stop(void);
+uint8_t i2c_master_write(uint8_t data);
+uint8_t i2c_master_read(int);
+void i2c_reset_state(void);
+void i2c_slave_init(uint8_t address);
+
+#endif

keyboards/lets_split/keymaps/default/keymap.c

@@ -1,4 +1,4 @@
-#include "lets-split.h"
+#include "lets_split.h"
 #include "action_layer.h"
 
 #define BASE 0
@@ -14,12 +14,12 @@ enum preonic_keycodes {
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
-[BASE] = {
-  {KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T     },
-  {KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G     },
-  {KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B     },
-  {KC_IDK,  KC_LCTL, KC_LALT, KC_LGUI, KC_SPC,  PM_RESET }
-}
+[BASE] = KEYMAP(
+  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,        KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC, \
+  KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,        KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, \
+  KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,        KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT, \
+  KC_IDK,  KC_LCTL, KC_LALT, KC_LGUI, PM_RESET,KC_SPC,      KC_SPC,  PM_RESET,KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT \
+)
 
 };
 

keyboards/lets_split/lets_split.c

@@ -1,4 +1,4 @@
-#include "lets-split.h"
+#include "lets_split.h"
 
 #ifdef AUDIO_ENABLE
     float tone_startup[][2] = SONG(STARTUP_SOUND);
@@ -12,13 +12,13 @@ void matrix_init_kb(void) {
         PLAY_NOTE_ARRAY(tone_startup, false, 0);
     #endif
 
-    // green led on
-    DDRD |= (1<<5);
-    PORTD &= ~(1<<5);
+    // // green led on
+    // DDRD |= (1<<5);
+    // PORTD &= ~(1<<5);
 
-    // orange led on
-    DDRB |= (1<<0);
-    PORTB &= ~(1<<0);
+    // // orange led on
+    // DDRB |= (1<<0);
+    // PORTB &= ~(1<<0);
 
 	matrix_init_user();
 };

keyboards/lets_split/lets_split.h

@@ -0,0 +1,21 @@
+#include "quantum.h"
+#include <avr/wdt.h>
+
+void promicro_bootloader_jmp(bool program);
+
+#define KEYMAP( \
+	k00, k01, k02, k03, k04, k05, k40, k41, k42, k43, k44, k45, \
+	k10, k11, k12, k13, k14, k15, k50, k51, k52, k53, k54, k55, \
+	k20, k21, k22, k23, k24, k25, k60, k61, k62, k63, k64, k65, \
+	k30, k31, k32, k33, k34, k35, k70, k71, k72, k73, k74, k75 \
+	) \
+	{ \
+		{ k00, k01, k02, k03, k04, k05 }, \
+		{ k10, k11, k12, k13, k14, k15 }, \
+		{ k20, k21, k22, k23, k24, k25 }, \
+		{ k30, k31, k32, k33, k34, k35 }, \
+		{ k40, k41, k42, k43, k44, k45 }, \
+		{ k50, k51, k52, k53, k54, k55 }, \
+		{ k60, k61, k62, k63, k64, k65 }, \
+		{ k70, k71, k72, k73, k74, k75 } \
+	}

keyboards/lets_split/split_util.c

@@ -0,0 +1,67 @@
+#include <avr/io.h>
+#include <avr/wdt.h>
+#include <avr/power.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/eeprom.h>
+#include "split_util.h"
+#include "matrix.h"
+#include "i2c.h"
+#include "keyboard.h"
+#include "config.h"
+
+volatile bool isLeftHand = true;
+
+static void setup_handedness(void) {
+    isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
+}
+
+static void keyboard_master_setup(void) {
+#ifdef USE_I2C
+    i2c_master_init();
+#else
+    serial_master_init();
+#endif
+}
+
+static void keyboard_slave_setup(void) {
+#ifdef USE_I2C
+    i2c_slave_init(SLAVE_I2C_ADDRESS);
+#else
+    serial_slave_init();
+#endif
+}
+
+bool has_usb(void) {
+   USBCON |= (1 << OTGPADE); //enables VBUS pad
+   _delay_us(5);
+   return (USBSTA & (1<<VBUS));  //checks state of VBUS
+}
+
+void split_keyboard_setup(void) {
+   setup_handedness();
+
+   if (has_usb()) {
+      keyboard_master_setup();
+   } else {
+      keyboard_slave_setup();
+   }
+   sei();
+}
+
+void keyboard_slave_loop(void) {
+   matrix_init();
+
+   while (1) {
+      matrix_slave_scan();
+   }
+}
+
+// this code runs before the usb and keyboard is initialized
+void matrix_setup(void) {
+    split_keyboard_setup();
+
+    if (!has_usb()) {
+        keyboard_slave_loop();
+    }
+}

keyboards/lets_split/split_util.h

@@ -0,0 +1,20 @@
+#ifndef SPLIT_KEYBOARD_UTIL_H
+#define SPLIT_KEYBOARD_UTIL_H
+
+#include <stdbool.h>
+
+#define EECONFIG_BOOTMAGIC_END      (uint8_t *)10
+#define EECONFIG_HANDEDNESS         EECONFIG_BOOTMAGIC_END
+
+#define SLAVE_I2C_ADDRESS           0x32
+
+extern volatile bool isLeftHand;
+
+// slave version of matix scan, defined in matrix.c
+void matrix_slave_scan(void);
+
+void split_keyboard_setup(void);
+bool has_usb(void);
+void keyboard_slave_loop(void);
+
+#endif

keyboards/lets_split/uno-slave/Makefile

@@ -0,0 +1,226 @@
+# Hey Emacs, this is a -*- makefile -*-
+
+# AVR-GCC Makefile template, derived from the WinAVR template (which
+# is public domain), believed to be neutral to any flavor of "make"
+# (GNU make, BSD make, SysV make)
+
+
+MCU = atmega328p
+FORMAT = ihex
+TARGET = keyboard-i2c-slave
+SRC = \
+	$(TARGET).c \
+	uno-matrix.c \
+	../serial.c \
+	../i2c-slave.c
+
+ASRC =
+OPT = s
+
+# Programming support using avrdude. Settings and variables.
+
+AVRDUDE_PROGRAMMER = arduino
+AVRDUDE_PORT = /dev/ttyACM0
+
+# Name of this Makefile (used for "make depend").
+MAKEFILE = Makefile
+
+# Debugging format.
+# Native formats for AVR-GCC's -g are stabs [default], or dwarf-2.
+# AVR (extended) COFF requires stabs, plus an avr-objcopy run.
+DEBUG = stabs
+
+# Compiler flag to set the C Standard level.
+# c89   - "ANSI" C
+# gnu89 - c89 plus GCC extensions
+# c99   - ISO C99 standard (not yet fully implemented)
+# gnu99 - c99 plus GCC extensions
+CSTANDARD = -std=gnu99
+
+# Place -D or -U options here
+CDEFS =
+
+# Place -I options here
+CINCS =
+
+
+CDEBUG = -g$(DEBUG)
+CWARN = -Wall -Wstrict-prototypes
+CTUNING = -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+#CEXTRA = -Wa,-adhlns=$(<:.c=.lst)
+CFLAGS = $(CDEBUG) $(CDEFS) $(CINCS) -O$(OPT) $(CWARN) $(CSTANDARD) $(CEXTRA) \
+	-fno-aggressive-loop-optimizations
+
+#ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs
+
+
+#Additional libraries.
+
+# Minimalistic printf version
+PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min
+
+# Floating point printf version (requires MATH_LIB = -lm below)
+PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt
+
+PRINTF_LIB =
+
+# Minimalistic scanf version
+SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min
+
+# Floating point + %[ scanf version (requires MATH_LIB = -lm below)
+SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt
+
+SCANF_LIB =
+
+MATH_LIB = -lm
+
+# External memory options
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# used for variables (.data/.bss) and heap (malloc()).
+#EXTMEMOPTS = -Wl,--section-start,.data=0x801100,--defsym=__heap_end=0x80ffff
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# only used for heap (malloc()).
+#EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff
+
+EXTMEMOPTS =
+
+#LDMAP = $(LDFLAGS) -Wl,-Map=$(TARGET).map,--cref
+LDFLAGS = $(EXTMEMOPTS) $(LDMAP) $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
+
+
+AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
+#AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep
+
+
+# Uncomment the following if you want avrdude's erase cycle counter.
+# Note that this counter needs to be initialized first using -Yn,
+# see avrdude manual.
+#AVRDUDE_ERASE_COUNTER = -y
+
+# Uncomment the following if you do /not/ wish a verification to be
+# performed after programming the device.
+#AVRDUDE_NO_VERIFY = -V
+
+# Increase verbosity level.  Please use this when submitting bug
+# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude>
+# to submit bug reports.
+#AVRDUDE_VERBOSE = -v -v
+
+AVRDUDE_BASIC = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
+AVRDUDE_FLAGS = $(AVRDUDE_BASIC) $(AVRDUDE_NO_VERIFY) $(AVRDUDE_VERBOSE) $(AVRDUDE_ERASE_COUNTER)
+
+
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+NM = avr-nm
+AVRDUDE = avrdude
+REMOVE = rm -f
+MV = mv -f
+
+# Define all object files.
+OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)
+
+# Define all listing files.
+LST = $(ASRC:.S=.lst) $(SRC:.c=.lst)
+
+# Combine all necessary flags and optional flags.
+# Add target processor to flags.
+ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS)
+ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)
+
+
+# Default target.
+all: build
+
+build: elf hex eep
+
+elf: $(TARGET).elf
+hex: $(TARGET).hex
+eep: $(TARGET).eep
+lss: $(TARGET).lss
+sym: $(TARGET).sym
+
+
+# Program the device.
+program: $(TARGET).hex $(TARGET).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+
+
+# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
+COFFCONVERT=$(OBJCOPY) --debugging \
+--change-section-address .data-0x800000 \
+--change-section-address .bss-0x800000 \
+--change-section-address .noinit-0x800000 \
+--change-section-address .eeprom-0x810000
+
+
+coff: $(TARGET).elf
+	$(COFFCONVERT) -O coff-avr $(TARGET).elf $(TARGET).cof
+
+
+extcoff: $(TARGET).elf
+	$(COFFCONVERT) -O coff-ext-avr $(TARGET).elf $(TARGET).cof
+
+
+.SUFFIXES: .elf .hex .eep .lss .sym
+
+.elf.hex:
+	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+.elf.eep:
+	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+	--change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+
+# Create extended listing file from ELF output file.
+.elf.lss:
+	$(OBJDUMP) -h -S $< > $@
+
+# Create a symbol table from ELF output file.
+.elf.sym:
+	$(NM) -n $< > $@
+
+
+
+# Link: create ELF output file from object files.
+$(TARGET).elf: $(OBJ)
+	$(CC) $(ALL_CFLAGS) $(OBJ) --output $@ $(LDFLAGS)
+
+
+# Compile: create object files from C source files.
+.c.o:
+	$(CC) -c $(ALL_CFLAGS) $< -o $@
+
+
+# Compile: create assembler files from C source files.
+.c.s:
+	$(CC) -S $(ALL_CFLAGS) $< -o $@
+
+
+# Assemble: create object files from assembler source files.
+.S.o:
+	$(CC) -c $(ALL_ASFLAGS) $< -o $@
+
+
+
+# Target: clean project.
+clean:
+	$(REMOVE) $(TARGET).hex $(TARGET).eep $(TARGET).cof $(TARGET).elf \
+	$(TARGET).map $(TARGET).sym $(TARGET).lss \
+	$(OBJ) $(LST) $(SRC:.c=.s) $(SRC:.c=.d)
+
+depend:
+	if grep '^# DO NOT DELETE' $(MAKEFILE) >/dev/null; \
+	then \
+		sed -e '/^# DO NOT DELETE/,$$d' $(MAKEFILE) > \
+			$(MAKEFILE).$$$$ && \
+		$(MV) $(MAKEFILE).$$$$ $(MAKEFILE); \
+	fi
+	echo '# DO NOT DELETE THIS LINE -- make depend depends on it.' \
+		>> $(MAKEFILE); \
+	$(CC) -M -mmcu=$(MCU) $(CDEFS) $(CINCS) $(SRC) $(ASRC) >> $(MAKEFILE)
+
+.PHONY:	all build elf hex eep lss sym program coff extcoff clean depend

keyboards/lets_split/uno-slave/keyboard-i2c-slave.c

@@ -0,0 +1,42 @@
+#include "../i2c-slave.h"
+#include "../serial.h"
+#include "uno-matrix.h"
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+void setup(void) {
+  // give some time for noise to clear
+  _delay_us(1000);
+
+  // turn off arduino uno's led on pin 13
+  DDRB |= (1 << 5);
+  PORTB &= ~(1 << 5);
+
+  matrix_init();
+  /* i2c_slave_init(0x32); */
+  serial_slave_init();
+
+  /* serial_slave_buffer[0] = 0xa1; */
+  /* serial_slave_buffer[1] = 0x52; */
+  /* serial_slave_buffer[2] = 0xa2; */
+  /* serial_slave_buffer[3] = 0x67; */
+
+  // need interrupts for i2c slave code to work
+  sei();
+}
+
+void loop(void) {
+  matrix_scan();
+  for(int i=0; i<MATRIX_ROWS; ++i) {
+    slaveBuffer[i] = matrix_get_row(i);
+    serial_slave_buffer[i] = slaveBuffer[i];
+  }
+}
+
+int main(int argc, char *argv[]) {
+  setup();
+  while (1)
+    loop();
+}

keyboards/lets_split/uno-slave/readme.md

@@ -0,0 +1 @@
+Code for Arduino uno (atmega328p) slave used for testing.

keyboards/lets_split/uno-slave/uno-matrix.c

@@ -0,0 +1,160 @@
+#define F_CPU 16000000UL
+
+#include <util/delay.h>
+#include <avr/io.h>
+#include <stdlib.h>
+
+#include "uno-matrix.h"
+
+#define debug(X) NULL
+#define debug_hex(X) NULL
+
+#ifndef DEBOUNCE
+#   define DEBOUNCE  5
+#endif
+
+static uint8_t debouncing = DEBOUNCE;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static matrix_row_t read_cols(void);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+    //debug_enable = true;
+    //debug_matrix = true;
+    //debug_mouse = true;
+    // initialize row and col
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+        matrix[i] = 0;
+        matrix_debouncing[i] = 0;
+    }
+}
+
+uint8_t matrix_scan(void)
+{
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        select_row(i);
+        _delay_us(30);  // without this wait read unstable value.
+        matrix_row_t cols = read_cols();
+        //Serial.println(cols, BIN);
+        if (matrix_debouncing[i] != cols) {
+            matrix_debouncing[i] = cols;
+            if (debouncing) {
+                debug("bounce!: "); debug_hex(debouncing); debug("\n");
+            }
+            debouncing = DEBOUNCE;
+        }
+        unselect_rows();
+    }
+
+    if (debouncing) {
+        if (--debouncing) {
+            _delay_ms(1);
+        } else {
+            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+                matrix[i] = matrix_debouncing[i];
+            }
+        }
+    }
+
+    return 1;
+}
+
+bool matrix_is_modified(void)
+{
+    if (debouncing) return false;
+    return true;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & ((matrix_row_t)1<<col));
+}
+
+inline
+matrix_row_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+// TODO update this comment
+/* Column pin configuration
+ * col: 0   1   2   3   4   5
+ * pin: D3  D4  D5  D6  D7  B0
+ */
+static void  init_cols(void)
+{
+    // Input with pull-up(DDR:0, PORT:1)
+  DDRD  &= ~(1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
+  PORTD |=  (1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
+
+  DDRB  &= ~(1<<0);
+  PORTB |=  (1<<0);
+}
+
+static matrix_row_t read_cols(void)
+{
+    return (PIND&(1<<3) ? 0 : (1<<0)) |
+           (PIND&(1<<4) ? 0 : (1<<1)) |
+           (PIND&(1<<5) ? 0 : (1<<2)) |
+           (PIND&(1<<6) ? 0 : (1<<3)) |
+           (PIND&(1<<7) ? 0 : (1<<4)) |
+           (PINB&(1<<0) ? 0 : (1<<5));
+}
+
+/* Row pin configuration
+ * row: 0  1  2  3
+ * pin: C0 C1 C2 C3
+ */
+static void unselect_rows(void)
+{
+    // Hi-Z(DDR:0, PORT:0) to unselect
+    DDRC  &= ~0xF;
+    PORTC &= ~0xF;
+}
+
+static void select_row(uint8_t row)
+{
+    // Output low(DDR:1, PORT:0) to select
+    switch (row) {
+        case 0:
+            DDRC  |= (1<<0);
+            PORTC &= ~(1<<0);
+            break;
+        case 1:
+            DDRC  |= (1<<1);
+            PORTC &= ~(1<<1);
+            break;
+        case 2:
+            DDRC  |= (1<<2);
+            PORTC &= ~(1<<2);
+            break;
+        case 3:
+            DDRC  |= (1<<3);
+            PORTC &= ~(1<<3);
+            break;
+    }
+}

keyboards/lets_split/uno-slave/uno-matrix.h

@@ -0,0 +1,19 @@
+#ifndef UNO_MATRIX
+#define UNO_MATRIX
+
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 6
+
+#include <stdbool.h>
+
+typedef uint8_t matrix_row_t;
+
+uint8_t matrix_rows(void);
+uint8_t matrix_cols(void);
+void matrix_init(void);
+uint8_t matrix_scan(void);
+bool matrix_is_modified(void);
+bool matrix_is_on(uint8_t row, uint8_t col);
+matrix_row_t matrix_get_row(uint8_t row);
+
+#endif

tmk_core/common/matrix.h

@@ -72,6 +72,11 @@ void matrix_scan_kb(void);
 void matrix_init_user(void);
 void matrix_scan_user(void);
 
+#ifdef I2C_SPLIT
+	void slave_matrix_init(void);
+	uint8_t slave_matrix_scan(void);
+#endif
+
 #ifdef __cplusplus
 }
 #endif