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arty a7: Turn on LED 5 when SD card command-done interrupt is enabled

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This snoops writes to the interrupt enable registers of the SD card
interfaces and records whether the command-done interrupt is enabled.
LED 5 is turned on whenever either interface has this interrupt enabled
in order to serve as a disk activity indicator.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2026-01-28 10:27:24 +11:00
parent dcd1072c25
commit d4fec95044
1 changed files with 25 additions and 1 deletions
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26
fpga/top-arty.vhdl
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@@ -217,6 +217,7 @@ architecture behaviour of toplevel is
signal led_b_pwm : std_ulogic_vector(3 downto 0) := (others => '0');
signal led_r_pwm : std_ulogic_vector(3 downto 0) := (others => '0');
signal led_g_pwm : std_ulogic_vector(3 downto 0) := (others => '0');
signal disk_activity : std_ulogic := '0';
-- Dumb PWM for the LEDs, those RGB LEDs are too bright otherwise
signal pwm_counter : std_ulogic_vector(8 downto 0);
@@ -692,6 +693,8 @@ begin
signal wb_sdcard_adr : std_ulogic_vector(29 downto 0);
signal dma_msel : std_ulogic;
signal other_cyc : std_ulogic;
signal sdc0_activity : std_ulogic := '0';
signal sdc1_activity : std_ulogic := '0';
begin
litesdcard : litesdcard_core
@@ -802,6 +805,27 @@ begin
end if;
end process;
-- Capture writes to the interrupt enable registers, and record
-- the state of the command-done interrupt enable bit to use
-- as an activity indicator.
process(system_clk)
begin
if rising_edge(system_clk) then
if periph_rst = '1' then
sdc0_activity <= '0';
sdc1_activity <= '0';
elsif wb_sdcard_adr(11 downto 0) = x"602"
and wb_ext_io_in.stb = '1' and wb_ext_io_in.we = '1' then
if wb_sdcard_cyc = '1' then
sdc0_activity <= wb_ext_io_in.dat(3);
end if;
if wb_sdcard2_cyc = '1' then
sdc1_activity <= wb_ext_io_in.dat(3);
end if;
end if;
end if;
end process;
disk_activity <= sdc0_activity or sdc1_activity;
end generate;
-- Mux WB response on the IO bus
@@ -842,7 +866,7 @@ begin
end process;
led4 <= '0';
led5 <= '0';
led5 <= disk_activity;
led6 <= run_outs(1) when CPUS > 1 else '0';
led7 <= run_outs(0);