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cv1k: Detect versions of the ep1c12 firmware

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This commit is contained in:
Olivier Galibert 2022-01-07 13:43:10 +01:00
parent 8e86562b01
commit 46df3e7640
2 changed files with 60 additions and 3 deletions
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42
src/devices/video/epic12.cpp
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@ -1,6 +1,6 @@
// license:BSD-3-Clause
// copyright-holders:David Haywood, Luca Elia, MetalliC
/* emulation of Altera Cyclone EPIC12 FPGA programmed as a blitter */
/* emulation of Altera Cyclone EP1C12 FPGA programmed as a blitter */
#include "emu.h"
#include "epic12.h"
@ -61,6 +61,12 @@ void epic12_device::device_start()
m_blitter_delay_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(epic12_device::blitter_delay_callback),this));
m_blitter_delay_timer->adjust(attotime::never);
m_firmware_pos = 0;
m_firmware.clear();
m_firmware.resize(290405, 0);
m_firmware_port = 0;
m_firmware_version = -1;
save_item(NAME(m_gfx_addr));
save_item(NAME(m_gfx_scroll_0_x));
save_item(NAME(m_gfx_scroll_0_y));
@ -74,6 +80,10 @@ void epic12_device::device_start()
save_item(NAME(m_gfx_scroll_1_y_shadowcopy));
save_pointer(NAME(m_ram16_copy), m_main_ramsize/2);
save_item(NAME(*m_bitmaps));
save_item(NAME(m_firmware_pos));
save_item(NAME(m_firmware_port));
save_item(NAME(m_firmware));
save_item(NAME(m_firmware_version));
}
void epic12_device::device_reset()
@ -1012,13 +1022,39 @@ u64 epic12_device::fpga_r()
return 0xff;
}
// todo, store what's written here and checksum it, different microcode probably leads to slightly different blitter timings
void epic12_device::fpga_w(offs_t offset, u64 data, u64 mem_mask)
{
if (ACCESSING_BITS_24_31)
if (ACCESSING_BITS_0_7)
{
// data & 0x08 = CE
// data & 0x10 = CLK
// data & 0x20 = DATA
if((data & 0x08) && !(m_firmware_port & 0x10) && (data & 0x10)) {
if(m_firmware_pos < 2323240 && (data & 0x20))
m_firmware[m_firmware_pos >> 3] |= 1 << (m_firmware_pos & 7);
m_firmware_pos++;
}
m_firmware_port = data;
if(m_firmware_pos == 2323240) {
u8 checksum = 0;
for(u8 c : m_firmware)
checksum += c;
switch(checksum) {
case 0x03: m_firmware_version = FW_A; break;
case 0x3e: m_firmware_version = FW_B; break;
case 0xf9: m_firmware_version = FW_C; break;
case 0xe1: m_firmware_version = FW_D; break;
default: m_firmware_version = -1; break;
}
if(m_firmware_version < 0)
logerror("Unrecognized firmware version\n");
else
logerror("Detected firmware version %c\n", 'A' + m_firmware_version);
}
}
}

21
src/devices/video/epic12.h
View File

@ -78,6 +78,21 @@ public:
static void *blit_request_callback_unsafe(void *param, int threadid);
protected:
// The firmware versions
enum {
// Used by ibara & mushisama
FW_A, // Byte checksum 03
// Used by espgal2
FW_B, // Byte checksum 3e
// Used by espgal2a, mushitama and mushisamb
FW_C, // Byte checksum f9
// Used by everything else
FW_D, // Byte checksum e1
};
struct clr_t
{
// clr_t to r5g5b5
@ -821,6 +836,12 @@ protected:
emu_timer *m_blitter_delay_timer;
int m_blitter_busy;
// fpga firmware
std::vector<u8> m_firmware;
int m_firmware_pos;
u8 m_firmware_port;
int m_firmware_version;
// debug vram viewer
#ifdef DEBUG_VRAM_VIEWER
bool m_debug_vram_view_en;