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serial.c update (#4423)

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Pekaso 2018-11-15 11:36:53 +09:00 committed by Drashna Jaelre
parent d8f090e559
commit daf08f40f2
3 changed files with 254 additions and 103 deletions
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224
keyboards/fortitude60/serial.c
View file

@ -1,5 +1,10 @@
/* /*
* WARNING: be careful changing this code, it is very timing dependent * WARNING: be careful changing this code, it is very timing dependent
*
* 2018-10-28 checked
* avr-gcc 4.9.2
* avr-gcc 5.4.0
* avr-gcc 7.3.0
*/ */
#ifndef F_CPU #ifndef F_CPU
@ -14,10 +19,60 @@
#include "serial.h" #include "serial.h"
//#include <pro_micro.h> //#include <pro_micro.h>
#ifdef USE_SERIAL #ifdef SOFT_SERIAL_PIN
#ifndef SERIAL_USE_MULTI_TRANSACTION #ifdef __AVR_ATmega32U4__
/* --- USE Simple API (OLD API, compatible with let's split serial.c) */ // if using ATmega32U4 I2C, can not use PD0 and PD1 in soft serial.
#ifdef USE_I2C
#if SOFT_SERIAL_PIN == D0 || SOFT_SERIAL_PIN == D1
#error Using ATmega32U4 I2C, so can not use PD0, PD1
#endif
#endif
#if SOFT_SERIAL_PIN >= D0 && SOFT_SERIAL_PIN <= D3
#define SERIAL_PIN_DDR DDRD
#define SERIAL_PIN_PORT PORTD
#define SERIAL_PIN_INPUT PIND
#if SOFT_SERIAL_PIN == D0
#define SERIAL_PIN_MASK _BV(PD0)
#define EIMSK_BIT _BV(INT0)
#define EICRx_BIT (~(_BV(ISC00) | _BV(ISC01)))
#define SERIAL_PIN_INTERRUPT INT0_vect
#elif SOFT_SERIAL_PIN == D1
#define SERIAL_PIN_MASK _BV(PD1)
#define EIMSK_BIT _BV(INT1)
#define EICRx_BIT (~(_BV(ISC10) | _BV(ISC11)))
#define SERIAL_PIN_INTERRUPT INT1_vect
#elif SOFT_SERIAL_PIN == D2
#define SERIAL_PIN_MASK _BV(PD2)
#define EIMSK_BIT _BV(INT2)
#define EICRx_BIT (~(_BV(ISC20) | _BV(ISC21)))
#define SERIAL_PIN_INTERRUPT INT2_vect
#elif SOFT_SERIAL_PIN == D3
#define SERIAL_PIN_MASK _BV(PD3)
#define EIMSK_BIT _BV(INT3)
#define EICRx_BIT (~(_BV(ISC30) | _BV(ISC31)))
#define SERIAL_PIN_INTERRUPT INT3_vect
#endif
#elif SOFT_SERIAL_PIN == E6
#define SERIAL_PIN_DDR DDRE
#define SERIAL_PIN_PORT PORTE
#define SERIAL_PIN_INPUT PINE
#define SERIAL_PIN_MASK _BV(PE6)
#define EIMSK_BIT _BV(INT6)
#define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
#define SERIAL_PIN_INTERRUPT INT6_vect
#else
#error invalid SOFT_SERIAL_PIN value
#endif
#else
#error serial.c now support ATmega32U4 only
#endif
//////////////// for backward compatibility ////////////////////////////////
#if !defined(SERIAL_USE_SINGLE_TRANSACTION) && !defined(SERIAL_USE_MULTI_TRANSACTION)
/* --- USE OLD API (compatible with let's split serial.c) */
#if SERIAL_SLAVE_BUFFER_LENGTH > 0 #if SERIAL_SLAVE_BUFFER_LENGTH > 0
uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0}; uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
#endif #endif
@ -42,56 +97,118 @@ SSTD_t transactions[] = {
}; };
void serial_master_init(void) void serial_master_init(void)
{ soft_serial_initiator_init(transactions); } { soft_serial_initiator_init(transactions, TID_LIMIT(transactions)); }
void serial_slave_init(void) void serial_slave_init(void)
{ soft_serial_target_init(transactions); } { soft_serial_target_init(transactions, TID_LIMIT(transactions)); }
// 0 => no error // 0 => no error
// 1 => slave did not respond // 1 => slave did not respond
// 2 => checksum error // 2 => checksum error
int serial_update_buffers() int serial_update_buffers()
{ return soft_serial_transaction(); } {
int result;
result = soft_serial_transaction();
return result;
}
#endif // Simple API (OLD API, compatible with let's split serial.c) #endif // end of OLD API (compatible with let's split serial.c)
////////////////////////////////////////////////////////////////////////////
#define ALWAYS_INLINE __attribute__((always_inline)) #define ALWAYS_INLINE __attribute__((always_inline))
#define NO_INLINE __attribute__((noinline)) #define NO_INLINE __attribute__((noinline))
#define _delay_sub_us(x) __builtin_avr_delay_cycles(x) #define _delay_sub_us(x) __builtin_avr_delay_cycles(x)
// Serial pulse period in microseconds. // parity check
#define TID_SEND_ADJUST 14 #define ODD_PARITY 1
#define EVEN_PARITY 0
#define PARITY EVEN_PARITY
#define SELECT_SERIAL_SPEED 1 #ifdef SERIAL_DELAY
#if SELECT_SERIAL_SPEED == 0 // custom setup in config.h
// #define TID_SEND_ADJUST 2
// #define SERIAL_DELAY 6 // micro sec
// #define READ_WRITE_START_ADJUST 30 // cycles
// #define READ_WRITE_WIDTH_ADJUST 8 // cycles
#else
// ============ Standard setups ============
#ifndef SELECT_SOFT_SERIAL_SPEED
#define SELECT_SOFT_SERIAL_SPEED 1
// 0: about 189kbps
// 1: about 137kbps (default)
// 2: about 75kbps
// 3: about 39kbps
// 4: about 26kbps
// 5: about 20kbps
#endif
#if __GNUC__ < 6
#define TID_SEND_ADJUST 14
#else
#define TID_SEND_ADJUST 2
#endif
#if SELECT_SOFT_SERIAL_SPEED == 0
// Very High speed // Very High speed
#define SERIAL_DELAY 4 // micro sec #define SERIAL_DELAY 4 // micro sec
#if __GNUC__ < 6
#define READ_WRITE_START_ADJUST 33 // cycles #define READ_WRITE_START_ADJUST 33 // cycles
#define READ_WRITE_WIDTH_ADJUST 3 // cycles #define READ_WRITE_WIDTH_ADJUST 3 // cycles
#elif SELECT_SERIAL_SPEED == 1 #else
#define READ_WRITE_START_ADJUST 34 // cycles
#define READ_WRITE_WIDTH_ADJUST 7 // cycles
#endif
#elif SELECT_SOFT_SERIAL_SPEED == 1
// High speed // High speed
#define SERIAL_DELAY 6 // micro sec #define SERIAL_DELAY 6 // micro sec
#if __GNUC__ < 6
#define READ_WRITE_START_ADJUST 30 // cycles #define READ_WRITE_START_ADJUST 30 // cycles
#define READ_WRITE_WIDTH_ADJUST 3 // cycles #define READ_WRITE_WIDTH_ADJUST 3 // cycles
#elif SELECT_SERIAL_SPEED == 2 #else
#define READ_WRITE_START_ADJUST 33 // cycles
#define READ_WRITE_WIDTH_ADJUST 7 // cycles
#endif
#elif SELECT_SOFT_SERIAL_SPEED == 2
// Middle speed // Middle speed
#define SERIAL_DELAY 12 // micro sec #define SERIAL_DELAY 12 // micro sec
#define READ_WRITE_START_ADJUST 30 // cycles #define READ_WRITE_START_ADJUST 30 // cycles
#if __GNUC__ < 6
#define READ_WRITE_WIDTH_ADJUST 3 // cycles #define READ_WRITE_WIDTH_ADJUST 3 // cycles
#elif SELECT_SERIAL_SPEED == 3 #else
#define READ_WRITE_WIDTH_ADJUST 7 // cycles
#endif
#elif SELECT_SOFT_SERIAL_SPEED == 3
// Low speed // Low speed
#define SERIAL_DELAY 24 // micro sec #define SERIAL_DELAY 24 // micro sec
#define READ_WRITE_START_ADJUST 30 // cycles #define READ_WRITE_START_ADJUST 30 // cycles
#if __GNUC__ < 6
#define READ_WRITE_WIDTH_ADJUST 3 // cycles #define READ_WRITE_WIDTH_ADJUST 3 // cycles
#elif SELECT_SERIAL_SPEED == 4 #else
#define READ_WRITE_WIDTH_ADJUST 7 // cycles
#endif
#elif SELECT_SOFT_SERIAL_SPEED == 4
// Very Low speed // Very Low speed
#define SERIAL_DELAY 50 // micro sec #define SERIAL_DELAY 36 // micro sec
#define READ_WRITE_START_ADJUST 30 // cycles #define READ_WRITE_START_ADJUST 30 // cycles
#if __GNUC__ < 6
#define READ_WRITE_WIDTH_ADJUST 3 // cycles #define READ_WRITE_WIDTH_ADJUST 3 // cycles
#else
#define READ_WRITE_WIDTH_ADJUST 7 // cycles
#endif
#elif SELECT_SOFT_SERIAL_SPEED == 5
// Ultra Low speed
#define SERIAL_DELAY 48 // micro sec
#define READ_WRITE_START_ADJUST 30 // cycles
#if __GNUC__ < 6
#define READ_WRITE_WIDTH_ADJUST 3 // cycles
#else
#define READ_WRITE_WIDTH_ADJUST 7 // cycles
#endif
#else #else
#error Illegal Serial Speed #error invalid SELECT_SOFT_SERIAL_SPEED value
#endif #endif /* SELECT_SOFT_SERIAL_SPEED */
#endif /* SERIAL_DELAY */
#define SERIAL_DELAY_HALF1 (SERIAL_DELAY/2) #define SERIAL_DELAY_HALF1 (SERIAL_DELAY/2)
#define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY/2) #define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY/2)
@ -105,17 +222,21 @@ int serial_update_buffers()
#endif #endif
static SSTD_t *Transaction_table = NULL; static SSTD_t *Transaction_table = NULL;
static uint8_t Transaction_table_size = 0;
inline static void serial_delay(void) ALWAYS_INLINE;
inline static inline static
void serial_delay(void) { void serial_delay(void) {
_delay_us(SERIAL_DELAY); _delay_us(SERIAL_DELAY);
} }
inline static void serial_delay_half1(void) ALWAYS_INLINE;
inline static inline static
void serial_delay_half1(void) { void serial_delay_half1(void) {
_delay_us(SERIAL_DELAY_HALF1); _delay_us(SERIAL_DELAY_HALF1);
} }
inline static void serial_delay_half2(void) ALWAYS_INLINE;
inline static inline static
void serial_delay_half2(void) { void serial_delay_half2(void) {
_delay_us(SERIAL_DELAY_HALF2); _delay_us(SERIAL_DELAY_HALF2);
@ -135,6 +256,7 @@ void serial_input_with_pullup(void) {
SERIAL_PIN_PORT |= SERIAL_PIN_MASK; SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
} }
inline static uint8_t serial_read_pin(void) ALWAYS_INLINE;
inline static inline static
uint8_t serial_read_pin(void) { uint8_t serial_read_pin(void) {
return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK); return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK);
@ -152,30 +274,28 @@ void serial_high(void) {
SERIAL_PIN_PORT |= SERIAL_PIN_MASK; SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
} }
void soft_serial_initiator_init(SSTD_t *sstd_table) void soft_serial_initiator_init(SSTD_t *sstd_table, int sstd_table_size)
{ {
Transaction_table = sstd_table; Transaction_table = sstd_table;
Transaction_table_size = (uint8_t)sstd_table_size;
serial_output(); serial_output();
serial_high(); serial_high();
} }
void soft_serial_target_init(SSTD_t *sstd_table) void soft_serial_target_init(SSTD_t *sstd_table, int sstd_table_size)
{ {
Transaction_table = sstd_table; Transaction_table = sstd_table;
Transaction_table_size = (uint8_t)sstd_table_size;
serial_input_with_pullup(); serial_input_with_pullup();
#if SERIAL_PIN_MASK == _BV(PD0) // Enable INT0-INT3,INT6
// Enable INT0 EIMSK |= EIMSK_BIT;
EIMSK |= _BV(INT0); #if SERIAL_PIN_MASK == _BV(PE6)
// Trigger on falling edge of INT0 // Trigger on falling edge of INT6
EICRA &= ~(_BV(ISC00) | _BV(ISC01)); EICRB &= EICRx_BIT;
#elif SERIAL_PIN_MASK == _BV(PD2)
// Enable INT2
EIMSK |= _BV(INT2);
// Trigger on falling edge of INT2
EICRA &= ~(_BV(ISC20) | _BV(ISC21));
#else #else
#error unknown SERIAL_PIN_MASK value // Trigger on falling edge of INT0-INT3
EICRA &= EICRx_BIT;
#endif #endif
} }
@ -191,7 +311,7 @@ void sync_recv(void) {
} }
// Used by the reciver to send a synchronization signal to the sender. // Used by the reciver to send a synchronization signal to the sender.
static void sync_send(void)NO_INLINE; static void sync_send(void) NO_INLINE;
static static
void sync_send(void) { void sync_send(void) {
serial_low(); serial_low();
@ -205,7 +325,7 @@ static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
uint8_t byte, i, p, pb; uint8_t byte, i, p, pb;
_delay_sub_us(READ_WRITE_START_ADJUST); _delay_sub_us(READ_WRITE_START_ADJUST);
for( i = 0, byte = 0, p = 0; i < bit; i++ ) { for( i = 0, byte = 0, p = PARITY; i < bit; i++ ) {
serial_delay_half1(); // read the middle of pulses serial_delay_half1(); // read the middle of pulses
if( serial_read_pin() ) { if( serial_read_pin() ) {
byte = (byte << 1) | 1; p ^= 1; byte = (byte << 1) | 1; p ^= 1;
@ -230,7 +350,7 @@ static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE; void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE;
void serial_write_chunk(uint8_t data, uint8_t bit) { void serial_write_chunk(uint8_t data, uint8_t bit) {
uint8_t b, p; uint8_t b, p;
for( p = 0, b = 1<<(bit-1); b ; b >>= 1) { for( p = PARITY, b = 1<<(bit-1); b ; b >>= 1) {
if(data & b) { if(data & b) {
serial_high(); p ^= 1; serial_high(); p ^= 1;
} else { } else {
@ -288,6 +408,13 @@ void change_reciver2sender(void) {
serial_delay_half1(); //4 serial_delay_half1(); //4
} }
static inline uint8_t nibble_bits_count(uint8_t bits)
{
bits = (bits & 0x5) + (bits >> 1 & 0x5);
bits = (bits & 0x3) + (bits >> 2 & 0x3);
return bits;
}
// interrupt handle to be used by the target device // interrupt handle to be used by the target device
ISR(SERIAL_PIN_INTERRUPT) { ISR(SERIAL_PIN_INTERRUPT) {
@ -297,12 +424,15 @@ ISR(SERIAL_PIN_INTERRUPT) {
SSTD_t *trans = Transaction_table; SSTD_t *trans = Transaction_table;
#else #else
// recive transaction table index // recive transaction table index
uint8_t tid; uint8_t tid, bits;
uint8_t pecount = 0; uint8_t pecount = 0;
sync_recv(); sync_recv();
tid = serial_read_chunk(&pecount,4); bits = serial_read_chunk(&pecount,7);
if(pecount> 0) tid = bits>>3;
bits = (bits&7) != nibble_bits_count(tid);
if( bits || pecount> 0 || tid > Transaction_table_size ) {
return; return;
}
serial_delay_half1(); serial_delay_half1();
serial_high(); // response step1 low->high serial_high(); // response step1 low->high
@ -349,6 +479,8 @@ int soft_serial_transaction(void) {
SSTD_t *trans = Transaction_table; SSTD_t *trans = Transaction_table;
#else #else
int soft_serial_transaction(int sstd_index) { int soft_serial_transaction(int sstd_index) {
if( sstd_index > Transaction_table_size )
return TRANSACTION_TYPE_ERROR;
SSTD_t *trans = &Transaction_table[sstd_index]; SSTD_t *trans = &Transaction_table[sstd_index];
#endif #endif
cli(); cli();
@ -375,9 +507,10 @@ int soft_serial_transaction(int sstd_index) {
#else #else
// send transaction table index // send transaction table index
int tid = (sstd_index<<3) | (7 & nibble_bits_count(sstd_index));
sync_send(); sync_send();
_delay_sub_us(TID_SEND_ADJUST); _delay_sub_us(TID_SEND_ADJUST);
serial_write_chunk(sstd_index, 4); serial_write_chunk(tid, 7);
serial_delay_half1(); serial_delay_half1();
// wait for the target response (step1 low->high) // wait for the target response (step1 low->high)
@ -442,3 +575,16 @@ int soft_serial_get_and_clean_status(int sstd_index) {
#endif #endif
#endif #endif
// Helix serial.c history
// 2018-1-29 fork from let's split and add PD2, modify sync_recv() (#2308, bceffdefc)
// 2018-6-28 bug fix master to slave comm and speed up (#3255, 1038bbef4)
// (adjusted with avr-gcc 4.9.2)
// 2018-7-13 remove USE_SERIAL_PD2 macro (#3374, f30d6dd78)
// (adjusted with avr-gcc 4.9.2)
// 2018-8-11 add support multi-type transaction (#3608, feb5e4aae)
// (adjusted with avr-gcc 4.9.2)
// 2018-10-21 fix serial and RGB animation conflict (#4191, 4665e4fff)
// (adjusted with avr-gcc 7.3.0)
// 2018-10-28 re-adjust compiler depend value of delay (#4269, 8517f8a66)
// (adjusted with avr-gcc 5.4.0, 7.3.0)

53
keyboards/fortitude60/serial.h
View file

@ -4,40 +4,47 @@
#include <stdbool.h> #include <stdbool.h>
// ///////////////////////////////////////////////////////////////// // /////////////////////////////////////////////////////////////////
// Need Soft Serial defines in serial_config.h // Need Soft Serial defines in config.h
// ///////////////////////////////////////////////////////////////// // /////////////////////////////////////////////////////////////////
// ex. // ex.
// #define SERIAL_PIN_DDR DDRD // #define SOFT_SERIAL_PIN ?? // ?? = D0,D1,D2,D3,E6
// #define SERIAL_PIN_PORT PORTD // OPTIONAL: #define SELECT_SOFT_SERIAL_SPEED ? // ? = 1,2,3,4,5
// #define SERIAL_PIN_INPUT PIND // // 1: about 137kbps (default)
// #define SERIAL_PIN_MASK _BV(PD?) ?=0,2 // // 2: about 75kbps
// #define SERIAL_PIN_INTERRUPT INT?_vect ?=0,2 // // 3: about 39kbps
// // 4: about 26kbps
// // 5: about 20kbps
// //
// //// USE Simple API (OLD API, compatible with let's split serial.c) // //// USE OLD API (compatible with let's split serial.c)
// ex. // ex.
// #define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2 // #define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
// #define SERIAL_MASTER_BUFFER_LENGTH 1 // #define SERIAL_MASTER_BUFFER_LENGTH 1
// //
// //// USE NEW API
// //// USE simple API (using signle-type transaction function)
// #define SERIAL_USE_SINGLE_TRANSACTION
// //// USE flexible API (using multi-type transaction function) // //// USE flexible API (using multi-type transaction function)
// #define SERIAL_USE_MULTI_TRANSACTION // #define SERIAL_USE_MULTI_TRANSACTION
// //
// ///////////////////////////////////////////////////////////////// // /////////////////////////////////////////////////////////////////
#ifndef SERIAL_USE_MULTI_TRANSACTION //////////////// for backward compatibility ////////////////////////////////
/* --- USE Simple API (OLD API, compatible with let's split serial.c) */ #if !defined(SERIAL_USE_SINGLE_TRANSACTION) && !defined(SERIAL_USE_MULTI_TRANSACTION)
#if SERIAL_SLAVE_BUFFER_LENGTH > 0 /* --- USE OLD API (compatible with let's split serial.c) */
extern volatile uint8_t serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH]; #if SERIAL_SLAVE_BUFFER_LENGTH > 0
#endif extern volatile uint8_t serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH];
#if SERIAL_MASTER_BUFFER_LENGTH > 0 #endif
extern volatile uint8_t serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH]; #if SERIAL_MASTER_BUFFER_LENGTH > 0
#endif extern volatile uint8_t serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH];
#endif
void serial_master_init(void); void serial_master_init(void);
void serial_slave_init(void); void serial_slave_init(void);
int serial_update_buffers(void); int serial_update_buffers(void);
#endif // USE Simple API #endif // end of USE OLD API
////////////////////////////////////////////////////////////////////////////
// Soft Serial Transaction Descriptor // Soft Serial Transaction Descriptor
typedef struct _SSTD_t { typedef struct _SSTD_t {
@ -47,16 +54,18 @@ typedef struct _SSTD_t {
uint8_t target2initiator_buffer_size; uint8_t target2initiator_buffer_size;
uint8_t *target2initiator_buffer; uint8_t *target2initiator_buffer;
} SSTD_t; } SSTD_t;
#define TID_LIMIT( table ) (sizeof(table) / sizeof(SSTD_t))
// initiator is transaction start side // initiator is transaction start side
void soft_serial_initiator_init(SSTD_t *sstd_table); void soft_serial_initiator_init(SSTD_t *sstd_table, int sstd_table_size);
// target is interrupt accept side // target is interrupt accept side
void soft_serial_target_init(SSTD_t *sstd_table); void soft_serial_target_init(SSTD_t *sstd_table, int sstd_table_size);
// initiator resullt // initiator resullt
#define TRANSACTION_END 0 #define TRANSACTION_END 0
#define TRANSACTION_NO_RESPONSE 0x1 #define TRANSACTION_NO_RESPONSE 0x1
#define TRANSACTION_DATA_ERROR 0x2 #define TRANSACTION_DATA_ERROR 0x2
#define TRANSACTION_TYPE_ERROR 0x4
#ifndef SERIAL_USE_MULTI_TRANSACTION #ifndef SERIAL_USE_MULTI_TRANSACTION
int soft_serial_transaction(void); int soft_serial_transaction(void);
#else #else
@ -72,7 +81,7 @@ int soft_serial_transaction(int sstd_index);
// target: // target:
// TRANSACTION_DATA_ERROR // TRANSACTION_DATA_ERROR
// or TRANSACTION_ACCEPTED // or TRANSACTION_ACCEPTED
#define TRANSACTION_ACCEPTED 0x4 #define TRANSACTION_ACCEPTED 0x8
#ifdef SERIAL_USE_MULTI_TRANSACTION #ifdef SERIAL_USE_MULTI_TRANSACTION
int soft_serial_get_and_clean_status(int sstd_index); int soft_serial_get_and_clean_status(int sstd_index);
#endif #endif

6
keyboards/fortitude60/serial_config.h
View file

@ -2,11 +2,7 @@
#define SOFT_SERIAL_CONFIG_H #define SOFT_SERIAL_CONFIG_H
/* Soft Serial defines */ /* Soft Serial defines */
#define SERIAL_PIN_DDR DDRD #define SOFT_SERIAL_PIN D2
#define SERIAL_PIN_PORT PORTD
#define SERIAL_PIN_INPUT PIND
#define SERIAL_PIN_MASK _BV(PD2)
#define SERIAL_PIN_INTERRUPT INT2_vect
#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2 #define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
#define SERIAL_MASTER_BUFFER_LENGTH 1 #define SERIAL_MASTER_BUFFER_LENGTH 1