diff options
Diffstat (limited to 'drivers/avr/i2c_slave.c')
| -rw-r--r-- | drivers/avr/i2c_slave.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/drivers/avr/i2c_slave.c b/drivers/avr/i2c_slave.c index 62a378165a..2907f164c0 100644 --- a/drivers/avr/i2c_slave.c +++ b/drivers/avr/i2c_slave.c @@ -17,6 +17,7 @@ * GitHub repository: https://github.com/g4lvanix/I2C-slave-lib */ +#include <stddef.h> #include <avr/io.h> #include <util/twi.h> #include <avr/interrupt.h> @@ -24,6 +25,12 @@ #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; @@ -48,11 +55,14 @@ ISR(TWI_vect) { 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-incriment + // First byte is the location then the bytes will be writen in buffer with auto-increment if (!slave_has_register_set) { buffer_address = TWDR; @@ -60,10 +70,25 @@ ISR(TWI_vect) { ack = 0; buffer_address = 0; } - slave_has_register_set = true; // address has been receaved now fill in buffer + 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; |