weight_multiplicative_impl.c

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/*
 * Copyright (c) 2015 The University of Manchester
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include "weight_multiplicative_impl.h"
 
//---------------------------------------
// Globals
//---------------------------------------
plasticity_weight_region_data_t *plasticity_weight_region_data;
 
uint32_t *weight_shift;
 
typedef struct {
    accum min_weight;
    accum max_weight;
    accum a2_plus;
    accum a2_minus;
} multiplicative_config_t;
 
//---------------------------------------
// Functions
//---------------------------------------
address_t weight_initialise(
        address_t address, uint32_t n_synapse_types,
        uint32_t *ring_buffer_to_input_buffer_left_shifts) {
    // Copy plasticity region data from address
    // **NOTE** this seems somewhat safer than relying on sizeof
    plasticity_weight_region_data_t *dtcm_copy = plasticity_weight_region_data =
            spin1_malloc(sizeof(plasticity_weight_region_data_t) * n_synapse_types);
    if (dtcm_copy == NULL) {
        log_error("Could not initialise weight region data");
        return NULL;
    }
    weight_shift = spin1_malloc(sizeof(uint32_t) * n_synapse_types);
    if (weight_shift == NULL) {
        log_error("Could not initialise weight region data");
        return NULL;
    }
 
    multiplicative_config_t *config = (multiplicative_config_t *) address;
    for (uint32_t s = 0; s < n_synapse_types; s++, config++) {
        // Copy parameters
        dtcm_copy[s].min_weight = config->min_weight;
        dtcm_copy[s].max_weight = config->max_weight;
        dtcm_copy[s].a2_plus = config->a2_plus;
        dtcm_copy[s].a2_minus = config->a2_minus;
 
        // Copy weight shift
        weight_shift[s] = ring_buffer_to_input_buffer_left_shifts[s];
 
        log_debug("\tSynapse type %u: Min weight:%d, Max weight:%d, A2+:%d, A2-:%d,"
                " Weight multiply right shift:%u",
                s, dtcm_copy[s].min_weight, dtcm_copy[s].max_weight,
                dtcm_copy[s].a2_plus, dtcm_copy[s].a2_minus, weight_shift[s]);
    }
 
    // Return end address of region
    return (address_t) config;
}