87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
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#include "fpga_cell.h"
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#include "fpga_global.h"
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#include <stddef.h>
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void fpga_cell_init(struct fpga_cell *fpga_cell,
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enum fpga_cell_type fpga_cell_type)
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{
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int i;
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for (i = 0; i < FPGA_CELL_CONNECTION_COUNT; ++i) {
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fpga_cell->cell_connections[i] = NULL;
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}
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fpga_cell->type = fpga_cell_type;
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report(LL_DEBUG,
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"Initialized cell of type %d at %p.",
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fpga_cell_type, fpga_cell);
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}
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enum fpga_cell_position fpga_cell_connection_opposing(enum fpga_cell_position position)
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{
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switch (position) {
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case LEFT:
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return RIGHT;
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case RIGHT:
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return LEFT;
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case TOP:
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return BOTTOM;
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case BOTTOM:
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return TOP;
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default:
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report(LL_ERROR,
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"Internal error: Requested opposite of invalid position %d.",
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position);
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return LEFT;
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}
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}
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/**
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* @brief fpga_cell_connect Connect <fpga_cell> to the <position> of <target_cell>
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* @param fpga_cell
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* @param target_cell
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* @param position
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* @return 0 on success, -1 on failure
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*/
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int fpga_cell_connect(struct fpga_cell *fpga_cell,
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struct fpga_cell *target_cell,
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enum fpga_cell_position position)
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{
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if (target_cell->cell_connections[position] ||
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fpga_cell->cell_connections[fpga_cell_connection_opposing(position)]) {
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report(LL_WARNING,
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"Tried to connect cell %p to pos %d of %p, even though a connection already exists for a least one of them.",
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fpga_cell, target_cell, position);
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errno = -ECONN;
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return -1;
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}
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target_cell->cell_connections[position] = fpga_cell;
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fpga_cell->cell_connections[fpga_cell_connection_opposing(position)] = target_cell;
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report(LL_DEBUG,
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"Connected cell %p to port %d of %p.",
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fpga_cell, position, target_cell);
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return 0;
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}
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/**
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* @brief fpga_cell_get_far Get cell on the far <position> of <cell>
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* @param cell
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* @param position
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* @return
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*/
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struct fpga_cell *fpga_cell_get_far(struct fpga_cell *cell,
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enum fpga_cell_position position)
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{
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struct fpga_cell *next = cell;
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while (next->cell_connections[position]) {
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next = next->cell_connections[position];
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}
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return next;
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}
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