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TMXR, PDP11, PDP10, VAX: Add DDCMP sync framer support

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This adds support for the "framer" device, which is a USB-connected
device built around a Raspberry Pico that connects to a synchronous
line, either RS-232 or DEC "integral modem" coax connection.  It
implements the framing portion of DDCMP: clock recovery for the
integral modem case, byte sync, and DDCMP frame handling including
CRC.  The actual DDCMP protocol state machine, with its handling of
sequencing, timeout and retransmit, etc. is left to the host
software.  All the design files for the framer may be found at
https://github.com/pkoning2/ddcmp .

This commit adds code to drive the framer from the TMXR library,
allowing it to be used either from simulated DMC-11 or simulated
DUP-11 devices.  Both have been tested, using RSTS/E, RSX-11/M+, and
TOPS-20.

Fixed the one-digit limit on eth<n> device names, the limit is now 2.
This commit is contained in:
Paul Koning
2022-01-08 14:24:42 -08:00
committed by Mark Pizzolato
parent 030a47bdb4
commit 5cd1e8b7ac
9 changed files with 601 additions and 86 deletions
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4
sim_ether.h
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@@ -232,6 +232,8 @@ struct eth_queue {
struct eth_item* item;
};
typedef unsigned char ETH_MAC[6];
struct eth_list {
char name[ETH_DEV_NAME_MAX];
char desc[ETH_DEV_DESC_MAX];
@@ -239,7 +241,6 @@ struct eth_list {
};
typedef int ETH_BOOL;
typedef unsigned char ETH_MAC[6];
typedef unsigned char ETH_MULTIHASH[8];
typedef struct eth_packet ETH_PACK;
typedef void (*ETH_PCALLBACK)(int status);
@@ -368,6 +369,7 @@ t_stat eth_show (FILE* st, UNIT* uptr, /* show ethernet devices
int32 val, CONST void* desc);
t_stat eth_show_devices (FILE* st, DEVICE *dptr, /* show ethernet devices */
UNIT* uptr, int32 val, CONST char* desc);
int eth_devices (int max, ETH_LIST* dev, ETH_BOOL framers); /* get ethernet devices on host */
void eth_show_dev (FILE*st, ETH_DEV* dev); /* show ethernet device state */
void eth_mac_fmt (ETH_MAC* const add, char* buffer); /* format ethernet mac address */