75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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#include <vpi_user.h>
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static void step(void);
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static vpiHandle w;
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static PLI_INT32 tick_cb(struct t_cb_data *cb)
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{
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static struct t_vpi_value val = { .format = vpiIntVal };
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static int idx;
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(void)cb;
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++idx;
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val.value.integer = idx & 1;
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vpi_put_value(w, &val, NULL, vpiNoDelay);
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step();
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return 0;
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}
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/* Request a callback after a delay. */
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static void step(void)
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{
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static struct t_vpi_time now = { .type = vpiSimTime, .low = 2 };
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static struct t_cb_data cbd =
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{ .reason = cbAfterDelay, .cb_rtn = tick_cb, .time = &now };
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/* Callback after delay. */
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vpi_register_cb(&cbd);
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}
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/* Callback function - simulation is starting. */
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static PLI_INT32 start_cb(struct t_cb_data *cb)
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{
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static struct t_vpi_value val = { .format = vpiIntVal };
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(void)cb;
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w = vpi_handle_by_name("test.w", NULL);
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if (!w)
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vpi_printf("No handle!\n");
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vpi_printf("Got handle for %s\n", vpi_get_str(vpiFullName, w));
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val.value.integer = 0;
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vpi_put_value(w, &val, NULL, vpiNoDelay);
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step();
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return 0;
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}
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/* VPI initialisation. */
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static void start(void)
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{
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static struct t_vpi_time now = { .type = vpiSimTime };
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static struct t_cb_data cbd = { .reason = cbStartOfSimulation,
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.time = &now, .cb_rtn = start_cb };
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/* At this point VPI objects do not exist,
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* so request a callback once they do.
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*/
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vpi_register_cb(&cbd);
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}
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/* This is a table of registration functions. This table is the external
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* symbol that the VVP simulator looks for when loading this .vpi module.
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*/
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void (*vlog_startup_routines[])(void) = {
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start,
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0
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};
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