summaryrefslogtreecommitdiffstatshomepage
path: root/trunk/src/emu/machine/ds2404.h
diff options
context:
space:
mode:
Diffstat (limited to 'trunk/src/emu/machine/ds2404.h')
-rw-r--r--trunk/src/emu/machine/ds2404.h140
1 files changed, 140 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/ds2404.h b/trunk/src/emu/machine/ds2404.h
new file mode 100644
index 00000000000..8f28e2164c4
--- /dev/null
+++ b/trunk/src/emu/machine/ds2404.h
@@ -0,0 +1,140 @@
+/**********************************************************************
+
+ DALLAS DS2404
+
+ RTC + BACKUP RAM
+
+**********************************************************************/
+
+#ifndef __DS2404_H__
+#define __DS2404_H__
+
+#include "emu.h"
+
+
+
+/***************************************************************************
+ DEVICE CONFIGURATION MACROS
+***************************************************************************/
+
+#define MCFG_DS2404_ADD(_tag, _ref_year, _ref_month, _ref_day) \
+ MCFG_DEVICE_ADD(_tag, DS2404, 0) \
+ MCFG_DS2404_REF_YEAR(_ref_year) \
+ MCFG_DS2404_REF_MONTH(_ref_month) \
+ MCFG_DS2404_REF_DAY(_ref_day)
+
+#define MCFG_DS2404_REF_YEAR(_ref_year) \
+ ds2404_device::static_set_ref_year(*device, _ref_year);
+
+#define MCFG_DS2404_REF_MONTH(_ref_month) \
+ ds2404_device::static_set_ref_month(*device, _ref_month);
+
+#define MCFG_DS2404_REF_DAY(_ref_day) \
+ ds2404_device::static_set_ref_day(*device, _ref_day);
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+
+// ======================> ds2404_device
+
+class ds2404_device : public device_t,
+ public device_nvram_interface
+{
+public:
+ // construction/destruction
+ ds2404_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // inline configuration helpers
+ static void static_set_ref_year(device_t &device, UINT32 m_ref_year);
+ static void static_set_ref_month(device_t &device, UINT8 m_ref_month);
+ static void static_set_ref_day(device_t &device, UINT8 m_ref_day);
+
+ /* 1-wire interface reset */
+ void ds2404_1w_reset_w(UINT32 offset, UINT8 data);
+
+ /* 3-wire interface reset */
+ void ds2404_3w_reset_w(UINT32 offset, UINT8 data);
+
+ UINT8 ds2404_data_r(UINT32 offset);
+ void ds2404_data_w(UINT32 offset, UINT8 data);
+ void ds2404_clk_w(UINT32 offset, UINT8 data);
+
+ void ds2404_tick();
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset() { }
+ virtual void device_post_load() { }
+ virtual void device_clock_changed() { }
+
+ // device_nvram_interface overrides
+ virtual void nvram_default();
+ virtual void nvram_read(emu_file &file);
+ virtual void nvram_write(emu_file &file);
+
+ static TIMER_CALLBACK( ds2404_tick_callback );
+
+private:
+
+ void ds2404_rom_cmd(UINT8 cmd);
+ void ds2404_cmd(UINT8 cmd);
+
+ UINT8 ds2404_readmem();
+ void ds2404_writemem(UINT8 value);
+
+ enum DS2404_STATE
+ {
+ DS2404_STATE_IDLE = 1, /* waiting for ROM command, in 1-wire mode */
+ DS2404_STATE_COMMAND, /* waiting for memory command */
+ DS2404_STATE_ADDRESS1, /* waiting for address bits 0-7 */
+ DS2404_STATE_ADDRESS2, /* waiting for address bits 8-15 */
+ DS2404_STATE_OFFSET, /* waiting for ending offset */
+ DS2404_STATE_INIT_COMMAND,
+ DS2404_STATE_READ_MEMORY, /* Read Memory command active */
+ DS2404_STATE_WRITE_SCRATCHPAD, /* Write Scratchpad command active */
+ DS2404_STATE_READ_SCRATCHPAD, /* Read Scratchpad command active */
+ DS2404_STATE_COPY_SCRATCHPAD /* Copy Scratchpad command active */
+ };
+
+ // configuration state
+ UINT32 m_ref_year;
+ UINT8 m_ref_month;
+ UINT8 m_ref_day;
+
+ UINT16 m_address;
+ UINT16 m_offset;
+ UINT16 m_end_offset;
+ UINT8 m_a1;
+ UINT8 m_a2;
+ UINT8 m_sram[512]; /* 4096 bits */
+ UINT8 m_ram[32]; /* scratchpad ram, 256 bits */
+ UINT8 m_rtc[5]; /* 40-bit RTC counter */
+ DS2404_STATE m_state[8];
+ int m_state_ptr;
+};
+
+
+// device type definition
+extern const device_type DS2404;
+
+
+
+/***************************************************************************
+ PROTOTYPES
+***************************************************************************/
+
+/* 1-wire interface reset */
+WRITE8_DEVICE_HANDLER( ds2404_1w_reset_w );
+
+/* 3-wire interface reset */
+WRITE8_DEVICE_HANDLER( ds2404_3w_reset_w );
+
+READ8_DEVICE_HANDLER( ds2404_data_r );
+WRITE8_DEVICE_HANDLER( ds2404_data_w );
+WRITE8_DEVICE_HANDLER( ds2404_clk_w );
+
+#endif