ttl-fpga/sw/kousaten/src/fpga_cell.c

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2019-06-16 21:27:42 +02:00
#include "fpga_cell.h"
#include "fpga_global.h"
#include <stddef.h>
void fpga_cell_init(struct fpga_cell *fpga_cell,
enum fpga_cell_type fpga_cell_type)
{
int i;
for (i = 0; i < FPGA_CELL_CONNECTION_COUNT; ++i) {
fpga_cell->cell_connections[i] = NULL;
}
fpga_cell->type = fpga_cell_type;
report(LL_DEBUG,
"Initialized cell of type %d at %p.",
fpga_cell_type, fpga_cell);
}
enum fpga_cell_position fpga_cell_connection_opposing(enum fpga_cell_position position)
{
switch (position) {
case LEFT:
return RIGHT;
case RIGHT:
return LEFT;
case TOP:
return BOTTOM;
case BOTTOM:
return TOP;
default:
report(LL_ERROR,
"Internal error: Requested opposite of invalid position %d.",
position);
return LEFT;
}
}
/**
* @brief fpga_cell_connect Connect <fpga_cell> to the <position> of <target_cell>
* @param fpga_cell
* @param target_cell
* @param position
* @return 0 on success, -1 on failure
*/
int fpga_cell_connect(struct fpga_cell *fpga_cell,
struct fpga_cell *target_cell,
enum fpga_cell_position position)
{
if (target_cell->cell_connections[position] ||
fpga_cell->cell_connections[fpga_cell_connection_opposing(position)]) {
report(LL_WARNING,
"Tried to connect cell %p to pos %d of %p, even though a connection already exists for a least one of them.",
fpga_cell, target_cell, position);
errno = -ECONN;
return -1;
}
target_cell->cell_connections[position] = fpga_cell;
fpga_cell->cell_connections[fpga_cell_connection_opposing(position)] = target_cell;
report(LL_DEBUG,
"Connected cell %p to port %d of %p.",
fpga_cell, position, target_cell);
return 0;
}
/**
* @brief fpga_cell_get_far Get cell on the far <position> of <cell>
* @param cell
* @param position
* @return
*/
struct fpga_cell *fpga_cell_get_far(struct fpga_cell *cell,
enum fpga_cell_position position)
{
struct fpga_cell *next = cell;
while (next->cell_connections[position]) {
next = next->cell_connections[position];
}
return next;
}