Extensible split data sync (#11930)
* 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.
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29 changed files with 1389 additions and 693 deletions
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@ -17,6 +17,7 @@
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* GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
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*/
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#include <stddef.h>
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#include <avr/io.h>
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#include <util/twi.h>
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#include <avr/interrupt.h>
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@ -24,6 +25,12 @@
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#include "i2c_slave.h"
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#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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# include "transactions.h"
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static volatile bool is_callback_executor = false;
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#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
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static volatile uint8_t buffer_address;
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@ -48,11 +55,14 @@ ISR(TWI_vect) {
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case TW_SR_SLA_ACK:
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// The device is now a slave receiver
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slave_has_register_set = false;
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#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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is_callback_executor = false;
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#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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break;
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case TW_SR_DATA_ACK:
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// This device is a slave receiver and has received data
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// First byte is the location then the bytes will be writen in buffer with auto-incriment
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// First byte is the location then the bytes will be writen in buffer with auto-increment
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if (!slave_has_register_set) {
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buffer_address = TWDR;
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@ -60,10 +70,25 @@ ISR(TWI_vect) {
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ack = 0;
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buffer_address = 0;
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}
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slave_has_register_set = true; // address has been receaved now fill in buffer
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slave_has_register_set = true; // address has been received now fill in buffer
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#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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// Work out if we're attempting to execute a callback
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is_callback_executor = buffer_address == split_transaction_table[I2C_EXECUTE_CALLBACK].initiator2target_offset;
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#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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} else {
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i2c_slave_reg[buffer_address] = TWDR;
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buffer_address++;
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#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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// If we're intending to execute a transaction callback, do so, as we've just received the transaction ID
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if (is_callback_executor) {
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split_transaction_desc_t *trans = &split_transaction_table[split_shmem->transaction_id];
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if (trans->slave_callback) {
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trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
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}
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}
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#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
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}
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break;
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