172e6a7030
* Extensible split data sync capability through transactions. - Split common transport has been split up between the transport layer and data layer. - Split "transactions" model used, with convergence between I2C and serial data definitions. - Slave matrix "generation count" is used to determine if the full slave matrix needs to be retrieved. - Encoders get the same "generation count" treatment. - All other blocks of data are synchronised when a change is detected. - All transmissions have a globally-configurable deadline before a transmission is forced (`FORCED_SYNC_THROTTLE_MS`, default 100ms). - Added atomicity for all core-synced data, preventing partial updates - Added retries to AVR i2c_master's i2c_start, to minimise the number of failed transactions when interrupts are disabled on the slave due to atomicity checks. - Some keyboards have had slight modifications made in order to ensure that they still build due to firmware size restrictions. * Fixup LED_MATRIX compile. * Parameterise ERROR_DISCONNECT_COUNT.
112 lines
4.2 KiB
C
112 lines
4.2 KiB
C
/* Copyright (C) 2019 Elia Ritterbusch
|
|
+
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
/* Library made by: g4lvanix
|
|
* GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <avr/io.h>
|
|
#include <util/twi.h>
|
|
#include <avr/interrupt.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "i2c_slave.h"
|
|
|
|
#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
# include "transactions.h"
|
|
|
|
static volatile bool is_callback_executor = false;
|
|
#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
|
|
volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
|
|
|
|
static volatile uint8_t buffer_address;
|
|
static volatile bool slave_has_register_set = false;
|
|
|
|
void i2c_slave_init(uint8_t address) {
|
|
// load address into TWI address register
|
|
TWAR = address;
|
|
// set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt
|
|
TWCR = (1 << TWIE) | (1 << TWEA) | (1 << TWINT) | (1 << TWEN);
|
|
}
|
|
|
|
void i2c_slave_stop(void) {
|
|
// clear acknowledge and enable bits
|
|
TWCR &= ~((1 << TWEA) | (1 << TWEN));
|
|
}
|
|
|
|
ISR(TWI_vect) {
|
|
uint8_t ack = 1;
|
|
|
|
switch (TW_STATUS) {
|
|
case TW_SR_SLA_ACK:
|
|
// The device is now a slave receiver
|
|
slave_has_register_set = false;
|
|
#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
is_callback_executor = false;
|
|
#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
break;
|
|
|
|
case TW_SR_DATA_ACK:
|
|
// This device is a slave receiver and has received data
|
|
// First byte is the location then the bytes will be writen in buffer with auto-increment
|
|
if (!slave_has_register_set) {
|
|
buffer_address = TWDR;
|
|
|
|
if (buffer_address >= I2C_SLAVE_REG_COUNT) { // address out of bounds dont ack
|
|
ack = 0;
|
|
buffer_address = 0;
|
|
}
|
|
slave_has_register_set = true; // address has been received now fill in buffer
|
|
|
|
#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
// Work out if we're attempting to execute a callback
|
|
is_callback_executor = buffer_address == split_transaction_table[I2C_EXECUTE_CALLBACK].initiator2target_offset;
|
|
#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
} else {
|
|
i2c_slave_reg[buffer_address] = TWDR;
|
|
buffer_address++;
|
|
|
|
#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
// If we're intending to execute a transaction callback, do so, as we've just received the transaction ID
|
|
if (is_callback_executor) {
|
|
split_transaction_desc_t *trans = &split_transaction_table[split_shmem->transaction_id];
|
|
if (trans->slave_callback) {
|
|
trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
|
|
}
|
|
}
|
|
#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
|
|
}
|
|
break;
|
|
|
|
case TW_ST_SLA_ACK:
|
|
case TW_ST_DATA_ACK:
|
|
// This device is a slave transmitter and master has requested data
|
|
TWDR = i2c_slave_reg[buffer_address];
|
|
buffer_address++;
|
|
break;
|
|
|
|
case TW_BUS_ERROR:
|
|
// We got an error, reset i2c
|
|
TWCR = 0;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// Reset i2c state machine to be ready for next interrupt
|
|
TWCR |= (1 << TWIE) | (1 << TWINT) | (ack << TWEA) | (1 << TWEN);
|
|
}
|