// license:BSD-3-Clause // copyright-holders:Couriersud /*************************************************************************** Gaelco 3D serial hardware Couriersud, early 2010 Not all lines are fully understood. There is some handshaking going on on send which is not fully understood. Those wishing to have a look at this: Serial send: 0x1fca (radikalb, 68020) 1866e (surfplnt) Serial receive: 0x1908 (radikalb, 68020) 185ae The receive is interrupt driven (interrupt 6) and the send is initiated out of the normal program loop. There is the chance of race conditions in mame. To run two instances of radikalb on *nix, use the following a) Uncomment SHARED_MEM_DRIVER below b) Open two terminals c) In terminal 1: mkdir /tmp/x1; cd /tmp/x1; /path/to/mame64 -np 2 -mt -rp /mnt/mame/romlib/r -inipath . radikalb -w -nomaximize -inipath . d) In terminal 2: mkdir /tmp/x2; cd /tmp/x2; /path/to/mame64 -np 2 -mt -rp /mnt/mame/romlib/r -inipath . radikalb -w -nomaximize -inipath . e) Set one instance to be master and one to be slave in service mode f) Have fun ***************************************************************************/ #include "emu.h" #include "gaelco3d.h" //#define SHARED_MEM_DRIVER (1) #include #include #include #ifdef _MSC_VER #include #define S_IRWXU (_S_IREAD | _S_IWRITE | _S_IEXEC) #else #include #endif #include #ifdef SHARED_MEM_DRIVER #include #endif #define VERBOSE (0) #if VERBOSE #define LOGMSG(x) logerror x #else #define LOGMSG(x) do {} while (0); #endif /* external status bits */ #define GAELCOSER_STATUS_READY 0x01 #define GAELCOSER_STATUS_RTS 0x02 /* only RTS currently understood ! */ //#define GAELCOSER_STATUS_DTR 0x04 /* internal bits follow ... */ #define GAELCOSER_STATUS_IRQ_ENABLE 0x10 #define GAELCOSER_STATUS_RESET 0x20 #define GAELCOSER_STATUS_SEND 0x40 /* * 115200 seems plausible, radikalb won't work below this speed * surfplnt will not work below 460800 .... * speedup will not work above 115200 * 10 bits = 8 data + 1 start + 1 stop */ #define LINK_BAUD (115200*4) //Only for speedup //#define LINK_BAUD (115200) #define LINK_BITS 10 #define LINK_FREQ (LINK_BAUD / LINK_BITS) /* Sync up the instances 8 times for each byte transferred */ #define SYNC_MULT (4) #define SYNC_FREQ (15000000 / 20) //(LINK_FREQ * SYNC_MULT) /* allow for slight differences in execution speed */ #define LINK_SLACK ((SYNC_MULT / 4) + 1) #define LINK_SLACK_B ((LINK_SLACK / 3) + 1) /* code below currently works on unix only */ #ifdef SHARED_MEM_DRIVER gaelco_serial_device::osd_shared_mem *gaelco_serial_device::osd_sharedmem_alloc(const char *path, int create, size_t size) { int fd; osd_shared_mem *os_shmem = (osd_shared_mem *)malloc(sizeof(osd_shared_mem)); if (create) { char *buf = (char *) malloc(size); memset(buf,0, size); fd = open(path, O_RDWR | O_CREAT, S_IRWXU); write(fd, buf, size); os_shmem->creator = 1; } else { fd = open(path, O_RDWR); if (fd == -1) { free(os_shmem); return nullptr; } os_shmem->creator = 0; } os_shmem->fn = (char *) malloc(strlen(path)+1); strcpy(os_shmem->fn, path); assert(fd != -1); os_shmem->ptr = mmap(nullptr, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); os_shmem->size = size; close(fd); return os_shmem; } void gaelco_serial_device::osd_sharedmem_free(osd_shared_mem *os_shmem) { munmap(os_shmem->ptr, os_shmem->size); if (os_shmem->creator) unlink(os_shmem->fn); free(os_shmem->fn); free(os_shmem); } void *gaelco_serial_device::osd_sharedmem_ptr(osd_shared_mem *os_shmem) { return os_shmem->ptr; } #else gaelco_serial_device::osd_shared_mem *gaelco_serial_device::osd_sharedmem_alloc(const char *path, int create, size_t size) { osd_shared_mem *os_shmem = (osd_shared_mem *) malloc(sizeof(osd_shared_mem)); os_shmem->creator = 0; os_shmem->ptr = (void *) malloc(size); os_shmem->size = size; return os_shmem; } void gaelco_serial_device::osd_sharedmem_free(osd_shared_mem *os_shmem) { free(os_shmem->ptr); free(os_shmem); } void *gaelco_serial_device::osd_sharedmem_ptr(osd_shared_mem *os_shmem) { return os_shmem->ptr; } #endif /*************************************************************************** DEVICE INTERFACE ***************************************************************************/ #define PATH_NAME "/tmp/gaelco_serial" void gaelco_serial_device::buf_reset(buf_t *buf) { buf->stat = GAELCOSER_STATUS_RTS | GAELCOSER_STATUS_RESET; buf->data = 0; buf->data_cnt = -1; buf->cnt = 0; } DEFINE_DEVICE_TYPE(GAELCO_SERIAL, gaelco_serial_device, "gaelco_serial", "Gaelco 3D Serial Hardware") gaelco_serial_device::gaelco_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, GAELCO_SERIAL, tag, owner, clock), m_irq_handler(*this), m_status(0), m_last_in_msg_cnt(0), m_slack_cnt(0), m_sync_timer(nullptr), m_in_ptr(nullptr), m_out_ptr(nullptr), m_os_shmem(nullptr), m_shmem(nullptr) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void gaelco_serial_device::device_start() { /* validate arguments */ assert(strlen(tag()) < 20); m_irq_handler.resolve_safe(); m_sync_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gaelco_serial_device::link_cb), this)); /* register for save states */ //save_item(NAME(earom->offset)); //save_item(NAME(earom->data)); #ifdef SHARED_MEM_DRIVER m_sync_timer->adjust(attotime::zero,0,attotime::from_hz(SYNC_FREQ)); #endif m_os_shmem = osd_sharedmem_alloc(PATH_NAME, 0, sizeof(shmem_t)); if (m_os_shmem == nullptr) { m_os_shmem = osd_sharedmem_alloc(PATH_NAME, 1, sizeof(shmem_t)); m_shmem = (shmem_t *) osd_sharedmem_ptr(m_os_shmem); m_in_ptr = &m_shmem->buf[0]; m_out_ptr = &m_shmem->buf[1]; } else { m_shmem = (shmem_t *) osd_sharedmem_ptr(m_os_shmem); m_in_ptr = &m_shmem->buf[1]; m_out_ptr = &m_shmem->buf[0]; } } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void gaelco_serial_device::device_reset() { m_status = GAELCOSER_STATUS_READY |GAELCOSER_STATUS_IRQ_ENABLE ; m_last_in_msg_cnt = -1; m_slack_cnt = LINK_SLACK_B; std::lock_guard guard(m_mutex); buf_reset(m_out_ptr); buf_reset(m_in_ptr); } //------------------------------------------------- // device_stop - device-specific stop //------------------------------------------------- void gaelco_serial_device::device_stop() { { std::lock_guard guard(m_mutex); buf_reset(m_out_ptr); buf_reset(m_in_ptr); } osd_sharedmem_free(m_os_shmem); } TIMER_CALLBACK_MEMBER( gaelco_serial_device::set_status_cb ) { uint8_t mask = param >> 8; uint8_t set = param & 0xff; m_status &= mask; m_status |= set; } void gaelco_serial_device::set_status(uint8_t mask, uint8_t set, int wait) { machine().scheduler().timer_set(attotime::from_hz(wait), timer_expired_delegate(FUNC(gaelco_serial_device::set_status_cb), this), (mask << 8)|set); } void gaelco_serial_device::process_in() { int t; if ((m_in_ptr->stat & GAELCOSER_STATUS_RESET) != 0) m_out_ptr->cnt = 0; /* new data available ? */ t = m_in_ptr->data_cnt; if (t != m_last_in_msg_cnt) { m_last_in_msg_cnt = t; if (m_in_ptr->cnt > 10) { m_status &= ~GAELCOSER_STATUS_READY; LOGMSG(("command receive %02x at %d (%d)\n", m_in_ptr->data, m_out_ptr->cnt, m_in_ptr->cnt)); if ((m_status & GAELCOSER_STATUS_IRQ_ENABLE) != 0) { m_irq_handler(1); LOGMSG(("irq!\n")); } } } } void gaelco_serial_device::sync_link() { volatile buf_t *buf = m_in_ptr; int breakme = 1; do { std::lock_guard guard(m_mutex); process_in(); /* HACK: put some timing noise on the line */ if (buf->cnt + m_slack_cnt > m_out_ptr->cnt) breakme = 0; /* stop if not connected .. */ if ((m_out_ptr->stat & GAELCOSER_STATUS_RESET) != 0) breakme = 0; } while (breakme); m_slack_cnt++; m_slack_cnt = (m_slack_cnt % LINK_SLACK) + LINK_SLACK_B; { std::lock_guard guard(m_mutex); m_out_ptr->stat &= ~GAELCOSER_STATUS_RESET; } } TIMER_CALLBACK_MEMBER( gaelco_serial_device::link_cb ) { std::lock_guard guard(m_mutex); m_out_ptr->cnt++; sync_link(); } /*************************************************************************** INTERFACE FUNCTIONS ***************************************************************************/ WRITE_LINE_MEMBER(gaelco_serial_device::irq_enable) { LOGMSG(("???? irq enable %d\n", state)); } READ8_MEMBER(gaelco_serial_device::status_r) { uint8_t ret = 0; std::lock_guard guard(m_mutex); process_in(); if ((m_status & GAELCOSER_STATUS_READY) != 0) ret |= 0x01; if ((m_in_ptr->stat & GAELCOSER_STATUS_RTS) != 0) ret |= 0x02; return ret; } WRITE8_MEMBER(gaelco_serial_device::data_w) { std::lock_guard guard(m_mutex); m_out_ptr->data = data; m_status &= ~GAELCOSER_STATUS_READY; m_out_ptr->data_cnt++; set_status( ~GAELCOSER_STATUS_READY, GAELCOSER_STATUS_READY, LINK_FREQ ); LOGMSG(("command send %02x at %d\n", data, m_out_ptr->cnt)); } READ8_MEMBER( gaelco_serial_device::data_r) { uint8_t ret; std::lock_guard guard(m_mutex); process_in(); ret = (m_in_ptr->data & 0xff); m_irq_handler(0); LOGMSG(("read %02x at %d (%d)\n", ret, m_out_ptr->cnt, m_in_ptr->cnt)); /* if we are not sending, mark as as ready */ if ((m_status & GAELCOSER_STATUS_SEND) == 0) m_status |= GAELCOSER_STATUS_READY; return ret; } WRITE_LINE_MEMBER(gaelco_serial_device::unknown_w) { std::lock_guard guard(m_mutex); LOGMSG(("???? unknown serial access %d\n", state)); } WRITE_LINE_MEMBER(gaelco_serial_device::rts_w) { std::lock_guard guard(m_mutex); if (state == 0) m_out_ptr->stat |= GAELCOSER_STATUS_RTS; else { //Commented out for now //m_status |= GAELCOSER_STATUS_READY; m_out_ptr->stat &= ~GAELCOSER_STATUS_RTS; } } WRITE_LINE_MEMBER(gaelco_serial_device::tr_w) { LOGMSG(("set transmit %d\n", data)); std::lock_guard guard(m_mutex); if (state != 0) m_status |= GAELCOSER_STATUS_SEND; else m_status &= ~GAELCOSER_STATUS_SEND; }