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-rw-r--r--src/devices/video/lc7985.cpp302
1 files changed, 302 insertions, 0 deletions
diff --git a/src/devices/video/lc7985.cpp b/src/devices/video/lc7985.cpp
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+++ b/src/devices/video/lc7985.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+/***************************************************************************
+
+ Sanyo LC7985NA/LC7985ND LCD controller
+
+***************************************************************************/
+
+#include "emu.h"
+#include "lc7985.h"
+
+DEFINE_DEVICE_TYPE(LC7985, lc7985_device, "lc7985", "Sanyo LC7985NA/LC7985ND LCD controller")
+
+
+ROM_START( lc7985 )
+ ROM_REGION( 0x1000, "cgrom", 0 )
+ ROM_LOAD( "lc7985.bin", 0x0000, 0x1000, BAD_DUMP CRC(fdc64160) SHA1(8e6b54f8fb7c4c15aab2e65dd1a44729b97423b1)) // from page 12 of the LC7985D datasheet
+ROM_END
+
+lc7985_device::lc7985_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, LC7985, tag, owner, clock),
+ m_cgrom_region(*this, DEVICE_SELF)
+{
+}
+
+const tiny_rom_entry *lc7985_device::device_rom_region() const
+{
+ return ROM_NAME(lc7985);
+}
+
+void lc7985_device::device_start()
+{
+ m_cgrom = m_cgrom_region.found() ? m_cgrom_region : memregion("cgrom")->base();
+ m_busy_timer = timer_alloc(FUNC(lc7985_device::clear_busy_flag), this);
+
+ save_item(NAME(m_ddram));
+ save_item(NAME(m_cgram));
+ save_item(NAME(m_busy_flag));
+ save_item(NAME(m_ddac));
+ save_item(NAME(m_cgac));
+ save_item(NAME(m_shift));
+ save_item(NAME(m_access_ddram));
+ save_item(NAME(m_function));
+ save_item(NAME(m_cds));
+}
+
+void lc7985_device::device_reset()
+{
+ memset(m_ddram, 0x20, sizeof(m_ddram)); // filled with SPACE char
+ memset(m_cgram, 0, sizeof(m_cgram));
+ m_ddac = 0x00;
+ m_cgac = 0x00;
+ m_shift = 0x00;
+ m_access_ddram = false;
+ m_function = 0x00;
+ m_cds = 0x00;
+ m_display = 0x00;
+ m_entry = 0x02;
+
+ busy(attotime::from_msec(10));
+}
+
+void lc7985_device::busy(attotime time)
+{
+ m_busy_flag = true;
+ m_busy_timer->adjust(time);
+}
+
+TIMER_CALLBACK_MEMBER(lc7985_device::clear_busy_flag)
+{
+ m_busy_flag = false;
+}
+
+void lc7985_device::inc_ddac()
+{
+ if(m_function & 0x08) { // 2 lines
+ if(m_ddac == 39)
+ m_ddac = 64;
+ else if(m_ddac == 64+39)
+ m_ddac = 0;
+ else
+ m_ddac++;
+ } else {
+ if(m_ddac == 79)
+ m_ddac = 0;
+ else
+ m_ddac++;
+ }
+}
+
+void lc7985_device::dec_ddac()
+{
+ if(m_function & 0x08) { // 2 lines
+ if(m_ddac == 64)
+ m_ddac = 39;
+ else if(m_ddac == 0)
+ m_ddac = 64+39;
+ else
+ m_ddac--;
+ } else {
+ if(m_ddac == 0)
+ m_ddac = 79;
+ else
+ m_ddac--;
+ }
+}
+
+void lc7985_device::shift_left()
+{
+ if(m_shift == 79)
+ m_shift = 0;
+ else
+ m_shift++;
+}
+
+void lc7985_device::shift_right()
+{
+ if(m_shift == 0)
+ m_shift = 79;
+ else
+ m_shift--;
+}
+
+void lc7985_device::ir_w(u8 data)
+{
+ if(m_busy_flag)
+ return;
+
+ if(data & 0x80) {
+ // Set DDRAM address
+ m_ddac = data & 0x7f;
+ m_access_ddram = true;
+ busy(attotime::from_usec(40));
+
+ } else if(data & 0x40) {
+ // Set CGRAM address
+ m_cgac = data & 0x3f;
+ m_access_ddram = false;
+ busy(attotime::from_usec(40));
+
+ } else if(data & 0x20) {
+ // Set Function
+ m_function = data;
+ busy(attotime::from_usec(40));
+
+ } else if(data & 0x10) {
+ // Cursor/Display Shift
+ m_access_ddram = true;
+ switch((data >> 2) & 3) {
+ case 0: dec_ddac(); break;
+ case 1: inc_ddac(); break;
+ case 2: shift_left(); break;
+ case 3: shift_right(); break;
+ }
+
+ busy(attotime::from_usec(40));
+
+ } else if(data & 0x08) {
+ // Display On/Off
+ m_display = data;
+ busy(attotime::from_usec(40));
+
+ } else if(data & 0x04) {
+ // Set Entry Mode
+ m_entry = data;
+ busy(attotime::from_usec(40));
+
+ } else if(data & 0x02) {
+ // Cursor home
+ m_ddac = 0;
+ m_shift = 0;
+ m_access_ddram = true;
+ busy(attotime::from_usec(16400));
+
+ } else if(data & 0x01) {
+ // Display clear
+ memset(m_ddram, 0x20, sizeof(m_ddram));
+ m_ddac = 0x00;
+ m_entry |= 0x02;
+ busy(attotime::from_usec(16400));
+ }
+}
+
+u8 lc7985_device::status_r()
+{
+ return (m_access_ddram ? m_ddac : m_cgac) | (m_busy_flag ? 0x80 : 0x00);
+}
+
+void lc7985_device::dr_w(u8 data)
+{
+ if(m_access_ddram) {
+ m_ddram[(m_function & 0x08) && m_ddac >= 64 ? m_ddac - (64-40) : m_ddac] = data;
+ switch(m_entry & 0x03) {
+ case 0: dec_ddac(); break;
+ case 1: dec_ddac(); shift_right(); break;
+ case 2: inc_ddac(); break;
+ case 3: inc_ddac(); shift_left(); break;
+ }
+
+ } else {
+ m_cgram[m_cgac] = data;
+ if(m_entry & 0x02)
+ m_cgac = (m_cgac + 1) & 0x3f;
+ else
+ m_cgac = (m_cgac - 1) & 0x3f;
+ }
+}
+
+u8 lc7985_device::dr_r()
+{
+ u8 res;
+ if(m_access_ddram) {
+ res = m_ddram[(m_function & 0x08) && m_ddac >= 64 ? m_ddac - (64-40) : m_ddac];
+ if(m_entry & 0x02)
+ inc_ddac();
+ else
+ dec_ddac();
+
+ } else {
+ res = m_cgram[m_cgac];
+ if(m_entry & 0x02)
+ m_cgac = (m_cgac + 1) & 0x3f;
+ else
+ m_cgac = (m_cgac - 1) & 0x3f;
+ }
+ return res;
+}
+
+const u8 *lc7985_device::render()
+{
+ memset(m_render_buffer, 0, sizeof(m_render_buffer));
+ if(!(m_display & 0x04))
+ return m_render_buffer;
+
+ if(m_function & 0x08) {
+ for(int y = 0; y != 2; y++) {
+ for(int x = 0; x != 40; x ++) {
+ u8 c = m_ddram[((x + 80 - m_shift) % 40) + 40*y];
+ const u8 *src = c < 32 ? m_cgram + 8*(c & 7) : m_cgrom + 16 * c;
+ u8 *dest = m_render_buffer + 8 * y + 16 * x;
+ for(int z = 0; z != 8; z ++)
+ *dest++ = *src++ & 0x1f;
+ }
+ }
+ if(m_display & 0x03) {
+ int cx = ((m_ddac & 0x3f) + 80 - m_shift) % 80;
+ u8 *dest = m_render_buffer + (m_ddac >= 0x40 ? 8 : 0) + 16*cx;
+ if(m_display & 0x02)
+ dest[7] = 0x1f;
+ if(m_display & 0x01) {
+ bool on = int(machine().time().as_double() / 0.409) & 1;
+ if(on)
+ for(int z = 0; z != 8; z ++)
+ *dest++ = 0x1f;
+ }
+ }
+
+ } else if(m_function & 0x04) {
+ for(int x = 0; x != 80; x ++) {
+ u8 c = m_ddram[(x + 80 - m_shift) % 80];
+ const u8 *src = c < 32 ? m_cgram + 8*(c & 6) : m_cgrom + 16 * c;
+ u8 *dest = m_render_buffer + 16 * x;
+ for(int z = 0; z != 11; z ++)
+ *dest++ = *src++ & 0x1f;
+ }
+ if(m_display & 0x03) {
+ int cx = (m_ddac + 80 - m_shift) % 80;
+ u8 *dest = m_render_buffer + 16*cx;
+ if(m_display & 0x02)
+ dest[10] = 0x1f;
+ if(m_display & 0x01) {
+ bool on = int(machine().time().as_double() / 0.409) & 1;
+ if(on)
+ for(int z = 0; z != 11; z ++)
+ *dest++ = 0x1f;
+ }
+ }
+
+ } else {
+ for(int x = 0; x != 80; x ++) {
+ u8 c = m_ddram[(x + 80 - m_shift) % 80];
+ const u8 *src = c < 32 ? m_cgram + 8*(c & 7) : m_cgrom + 16 * c;
+ u8 *dest = m_render_buffer + 16 * x;
+ for(int z = 0; z != 8; z ++)
+ *dest++ = *src++ & 0x1f;
+ }
+ if(m_display & 0x03) {
+ int cx = (m_ddac + 80 - m_shift) % 80;
+ u8 *dest = m_render_buffer + 16*cx;
+ if(m_display & 0x02)
+ dest[7] = 0x1f;
+ if(m_display & 0x01) {
+ bool on = int(machine().time().as_double() / 0.409) & 1;
+ if(on)
+ for(int z = 0; z != 8; z ++)
+ *dest++ = 0x1f;
+ }
+ }
+ }
+ return m_render_buffer;
+}
+