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-rw-r--r--src/devices/machine/saa7191.cpp214
1 files changed, 214 insertions, 0 deletions
diff --git a/src/devices/machine/saa7191.cpp b/src/devices/machine/saa7191.cpp
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index 00000000000..61c16feba67
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+++ b/src/devices/machine/saa7191.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/*********************************************************************
+
+ saa7191.cpp
+
+ Philips SAA7191B Digital Multistandard Colour Decoder (DMSD)
+
+ TODO:
+ - Actual functionality
+
+*********************************************************************/
+
+#include "emu.h"
+#include "saa7191.h"
+
+#define LOG_UNKNOWN (1U << 1)
+#define LOG_READS (1U << 2)
+#define LOG_WRITES (1U << 3)
+#define LOG_ERRORS (1U << 4)
+#define LOG_I2C_IGNORES (1U << 5)
+#define LOG_DEFAULT (LOG_READS | LOG_WRITES | LOG_ERRORS | LOG_I2C_IGNORES | LOG_UNKNOWN)
+
+#define VERBOSE (LOG_DEFAULT)
+#include "logmacro.h"
+
+DEFINE_DEVICE_TYPE(SAA7191, saa7191_device, "saa7191", "Philips SAA7191 DMSD")
+
+saa7191_device::saa7191_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, SAA7191, tag, owner, clock)
+ , m_chr_in(*this, 0)
+ , m_cvbs_in(*this, 0)
+ , m_y_out(*this)
+ , m_uv_out(*this)
+ , m_hs_out(*this)
+ , m_vs_out(*this)
+{
+}
+
+void saa7191_device::device_start()
+{
+ save_item(NAME(m_status));
+ save_item(NAME(m_regs));
+ save_item(NAME(m_i2c_write_addr));
+ save_item(NAME(m_i2c_read_addr));
+ save_item(NAME(m_i2c_subaddr));
+ save_item(NAME(m_i2c_state));
+}
+
+void saa7191_device::device_reset()
+{
+ m_status = 0;
+ memset(m_regs, 0, sizeof(uint8_t) * REG_COUNT);
+
+ m_i2c_write_addr = 0x8a;
+ m_i2c_read_addr = 0x8b;
+ m_i2c_subaddr = 0x00;
+ m_i2c_state = I2C_STATE_IDLE;
+}
+
+void saa7191_device::i2c_data_w(uint8_t data)
+{
+ switch (m_i2c_state)
+ {
+ case I2C_STATE_IDLE:
+ if (data == m_i2c_write_addr)
+ m_i2c_state = I2C_STATE_SUBADDR_WRITE;
+ else if (data == m_i2c_read_addr)
+ m_i2c_state = I2C_STATE_SUBADDR_READ;
+ else
+ LOGMASKED(LOG_I2C_IGNORES, "I2C idle, address %02x ignored (mine are R:%02x/W:%02x)\n", data, m_i2c_read_addr, m_i2c_write_addr);
+ break;
+ case I2C_STATE_SUBADDR_WRITE:
+ m_i2c_subaddr = data;
+ m_i2c_state = I2C_STATE_DATA_WRITE;
+ break;
+ case I2C_STATE_SUBADDR_READ:
+ m_i2c_subaddr = data;
+ m_i2c_state = I2C_STATE_DATA_READ;
+ break;
+ case I2C_STATE_DATA_WRITE:
+ reg_w(data);
+ m_i2c_subaddr = (m_i2c_subaddr + 1) % REG_COUNT;
+ break;
+ case I2C_STATE_DATA_READ:
+ LOGMASKED(LOG_ERRORS, "I2C is expecting a data read, but data was written, returning to idle\n");
+ m_i2c_state = I2C_STATE_IDLE;
+ break;
+ default:
+ LOGMASKED(LOG_ERRORS, "Unknown I2C state %d, returning to idle\n", m_i2c_state);
+ m_i2c_state = I2C_STATE_IDLE;
+ break;
+ }
+}
+
+uint8_t saa7191_device::i2c_data_r()
+{
+ if (m_i2c_state != I2C_STATE_DATA_READ)
+ {
+ LOGMASKED(LOG_ERRORS, "i2c_data_r called, but we are in state %d and not expecting a data read, returning to idle\n", m_i2c_state);
+ m_i2c_state = I2C_STATE_IDLE;
+ return 0;
+ }
+ if (m_i2c_subaddr == 0x01)
+ {
+ LOGMASKED(LOG_READS, "i2c_data_r: Status = %02x\n", m_status);
+ m_i2c_subaddr = (m_i2c_subaddr + 1) % REG_COUNT;
+ return m_status;
+ }
+ LOGMASKED(LOG_UNKNOWN, "i2c_data_r: Unknown Sub-Address %02x, returning 0\n", m_i2c_subaddr);
+ m_i2c_subaddr = (m_i2c_subaddr + 1) % REG_COUNT;
+ return 0;
+}
+
+void saa7191_device::i2c_stop_w(int state)
+{
+ if (state)
+ m_i2c_state = I2C_STATE_IDLE;
+}
+
+void saa7191_device::iicsa_w(int state)
+{
+ m_i2c_write_addr = state ? 0x8e : 0x8a;
+ m_i2c_read_addr = m_i2c_write_addr | 1;
+}
+
+void saa7191_device::reg_w(uint8_t data)
+{
+ if (m_i2c_subaddr < REG_COUNT)
+ {
+ m_regs[m_i2c_subaddr] = data;
+ }
+
+ switch (m_i2c_subaddr)
+ {
+ case REG_IDEL:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Increment delay = %02x\n", data);
+ break;
+ case REG_HSYB:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H sync begin, 50Hz = %02x\n", data);
+ break;
+ case REG_HSYS:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H sync stop, 50Hz = %02x\n", data);
+ break;
+ case REG_HCLB:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H clamp begin, 50Hz = %02x\n", data);
+ break;
+ case REG_HCLS:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H clamp stop, 50Hz = %02x\n", data);
+ break;
+ case REG_HPHI:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H sync after PHI1, 50Hz = %02x\n", data);
+ break;
+ case REG_LUMC:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Luminance control = %02x\n", data);
+ break;
+ case REG_HUEC:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Hue control = %02x\n", data);
+ break;
+ case REG_CKTQ:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Colour killer threshold QAM = %02x\n", data);
+ break;
+ case REG_CKTS:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Colour killer threshold SECAM = %02x\n", data);
+ break;
+ case REG_PLSE:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: PAL switch sensitivity = %02x\n", data);
+ break;
+ case REG_SESE:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: SECAM switch sensitivity = %02x\n", data);
+ break;
+ case REG_GAIN:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Chroma gain control settings = %02x\n", data);
+ break;
+ case REG_STDC:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Standard/mode control = %02x\n", data);
+ break;
+ case REG_IOCK:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: I/O and clock control = %02x\n", data);
+ break;
+ case REG_CTL1:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Control #1 = %02x\n", data);
+ break;
+ case REG_CTL2:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Control #2 = %02x\n", data);
+ break;
+ case REG_CHCV:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Chroma gain reference = %02x\n", data);
+ break;
+ case REG_HS6B:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H sync begin, 60Hz = %02x\n", data);
+ break;
+ case REG_HS6S:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H sync stop, 60Hz = %02x\n", data);
+ break;
+ case REG_HC6B:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H clamp begin, 60Hz = %02x\n", data);
+ break;
+ case REG_HC6S:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H clamp stop, 60Hz = %02x\n", data);
+ break;
+ case REG_HP6I:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: H sync after PHI1, 60Hz = %02x\n", data);
+ break;
+ default:
+ LOGMASKED(LOG_WRITES, "i2c_data_w: Unknown Register %02x = %02x (ignored)\n", m_i2c_subaddr, data);
+ if (m_i2c_subaddr < REG_COUNT)
+ {
+ m_regs[m_i2c_subaddr] = 0;
+ }
+ break;
+ }
+}
+