From 73dd7da0dbdbf7142f06b810ed7d6c241deb99c3 Mon Sep 17 00:00:00 2001
From: Klagarge <remi@heredero.ch>
Date: Fri, 1 Mar 2024 15:12:05 +0100
Subject: [PATCH] add signus signal

---
 .../hdl/lowpass_studentVersion.vhd                | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/01-WaveformGenerator/WaveformGenerator/hdl/lowpass_studentVersion.vhd b/01-WaveformGenerator/WaveformGenerator/hdl/lowpass_studentVersion.vhd
index f2e46c5..f982160 100644
--- a/01-WaveformGenerator/WaveformGenerator/hdl/lowpass_studentVersion.vhd
+++ b/01-WaveformGenerator/WaveformGenerator/hdl/lowpass_studentVersion.vhd
@@ -1,4 +1,17 @@
 ARCHITECTURE studentVersion OF lowpass IS
+
+  signal accumulator: unsigned((signalBitNb-1)+shiftBitNb downto 0);
+
 BEGIN
-  lowpassOut <= (others => '0');
+
+  process(clock)
+  begin
+    if reset = '1' then
+      accumulator <= (others => '0');
+    elsif rising_edge(clock) then
+      accumulator <= accumulator + resize(lowpassIn,signalBitNb+shiftBitNb) - shift_right(accumulator, shiftBitNb);
+    end if;
+  end process;
+
+  lowpassOut <= resize(shift_right(accumulator, shiftBitNb), signalBitNb);
 END ARCHITECTURE studentVersion;