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rocket-chip/csrc/remote_bitbang.h
Megan Wachs e82328336e Add in a SimJTAG to connect to OpenOCD's remote-bitbang interface.
This is simpler than JTAGVPI and is supported better by Verilor.
It is also the same thing Spike uses.
2018-01-05 16:02:52 -08:00

60 lines
1.2 KiB
C++

// See LICENSE.Berkeley for license details.
#ifndef REMOTE_BITBANG_H
#define REMOTE_BITBANG_H
#include <stdint.h>
#include <sys/types.h>
class remote_bitbang_t
{
public:
// Create a new server, listening for connections from localhost on the given
// port.
remote_bitbang_t(uint16_t port);
// Do a bit of work.
void tick(unsigned char * jtag_tck,
unsigned char * jtag_tms,
unsigned char * jtag_tdi,
unsigned char * jtag_trstn,
unsigned char jtag_tdo);
unsigned char done() {return quit;}
int exit_code() {return err;}
private:
int err;
unsigned char tck;
unsigned char tms;
unsigned char tdi;
unsigned char trstn;
unsigned char tdo;
unsigned char quit;
int socket_fd;
int client_fd;
static const ssize_t buf_size = 64 * 1024;
char recv_buf[buf_size];
ssize_t recv_start, recv_end;
// Check for a client connecting, and accept if there is one.
void accept();
// Execute any commands the client has for us.
// But we only execute 1 because we need time for the
// simulation to run.
void execute_command();
// Reset. Currently does nothing.
void reset();
void set_pins(char _tck, char _tms, char _tdi);
};
#endif