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Code Issues Releases Wiki Activity

[C64] UART support on userport

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This commit is contained in:
Gyorgy Szombathelyi
2019-02-13 06:50:26 +01:00
parent aea34fc19e
commit df03af7003
3 changed files with 34 additions and 7 deletions
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2
cores/c64/C64_mist.qsf
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@@ -383,4 +383,6 @@ set_global_assignment -name QIP_FILE rtl/mist/pll_c64_reconfig.qip
set_global_assignment -name QIP_FILE rtl/mist/rom_reconfig_pal.qip
set_global_assignment -name QIP_FILE rtl/mist/rom_reconfig_ntsc.qip
set_global_assignment -name SIGNALTAP_FILE output_files/pll.stp
set_location_assignment PIN_46 -to UART_TX
set_location_assignment PIN_31 -to UART_RX
set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top

2
cores/c64/C64_mist.sdc
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@@ -55,6 +55,8 @@ set_multicycle_path -from {video_mixer:vmixer|scandoubler:scandoubler|Hq2x:Hq2x|
set_multicycle_path -to {VGA_*[*]} -setup 4
set_multicycle_path -to {VGA_*[*]} -hold 3
set_false_path -from [get_ports {UART_RX}]
set_false_path -to [get_ports {UART_TX}]
set_false_path -to [get_ports {AUDIO_L}]
set_false_path -to [get_ports {AUDIO_R}]
set_false_path -to [get_ports {LED}]

37
cores/c64/rtl/mist/c64_mist.vhd
View File

@@ -68,7 +68,10 @@ entity c64_mist is port
SPI_DI : in std_logic;
SPI_SS2 : in std_logic;
SPI_SS3 : in std_logic;
CONF_DATA0 : in std_logic
CONF_DATA0 : in std_logic;
UART_RX : in std_logic;
UART_TX : out std_logic
);
end c64_mist;
@@ -133,8 +136,9 @@ constant CONF_STR : string :=
"O2,Video standard,PAL,NTSC;"&
"O8A,Scandoubler Fx,None,HQ2x-320,HQ2x-160,CRT 25%,CRT 50%;"&
"ODF,SID,6581 Mono,6581 Stereo,8580 Mono,8580 Stereo,Pseudo Stereo;"&
"O3,Joysticks,normal,swapped;"&
"O6,Audio filter,On,Off;"&
"O3,Joysticks,normal,swapped;"&
"O7,Userport,4-player IF,UART;"&
"O4,CIA Model,6256,8521;"&
-- "OB,BIOS,C64,C64GS;" &
"T5,Reset & Detach Cartridge;";
@@ -427,9 +431,10 @@ end component cartridge;
signal c1541_iec_clk_i : std_logic;
signal pa2_in : std_logic;
signal pa2_out : std_logic;
signal pa2_out : std_logic;
signal pb_in : std_logic_vector(7 downto 0);
signal pb_out : std_logic_vector(7 downto 0);
signal flag2_n : std_logic;
signal tv15Khz_mode : std_logic;
signal ypbpr : std_logic;
@@ -972,6 +977,7 @@ begin
pa2_out => pa2_out,
pb_in => pb_in,
pb_out => pb_out,
flag2_n => flag2_n,
cia_mode => status(4),
disk_num => open,
c64rom_addr => c64rom_addr,
@@ -982,10 +988,27 @@ begin
);
-- connect user port
pa2_in <= pa2_out;
pb_in(7 downto 6) <= pb_out(7 downto 6);
-- Protovision 4 player interface
pb_in(5 downto 0) <= not joyC_c64(5 downto 0) when pb_out(7) = '1' else not joyD_c64(5 downto 0);
process (pa2_out, pb_out, joyC_c64, joyD_c64, UART_RX, status)
begin
pa2_in <= pa2_out;
if status(7) = '0' then
-- Protovision 4 player interface
flag2_n <= '1';
UART_TX <= '0';
pb_in(7 downto 6) <= pb_out(7 downto 6);
if pb_out(7) = '1' then
pb_in(5 downto 0) <= not joyC_c64(5 downto 0);
else
pb_in(5 downto 0) <= not joyD_c64(5 downto 0);
end if;
else
-- UART
pb_in(7 downto 1) <= pb_out(7 downto 1);
flag2_n <= UART_RX;
pb_in(0) <= UART_RX;
UART_TX <= pa2_out;
end if;
end process;
disk_readonly <= status(16);