From 29e4b4cf091dd47c9f435ef1d315a1609b83fb19 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Sat, 15 Aug 2020 09:16:54 -0400
Subject: add elf load draft, filter program template

---
 filter/Makefile | 14 ++++++++++++++
 filter/test.cpp | 15 +++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 filter/Makefile
 create mode 100644 filter/test.cpp

(limited to 'filter')

diff --git a/filter/Makefile b/filter/Makefile
new file mode 100644
index 0000000..a1ce186
--- /dev/null
+++ b/filter/Makefile
@@ -0,0 +1,14 @@
+all:
+	@arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -Os --specs=nosys.specs -nostartfiles -fPIE -c test.cpp
+	@arm-none-eabi-ld -shared -n -N -z max-page-size=512 -Ttext-segment=0 \
+	    test.o -o test.so
+	@arm-none-eabi-strip -s -S --strip-unneeded test.so
+	@arm-none-eabi-objcopy --remove-section .dynsym \
+						   --remove-section .dynstr \
+						   --remove-section .dynamic \
+						   --remove-section .hash \
+						   --remove-section .ARM.exidx \
+						   --remove-section .ARM.attributes \
+						   --remove-section .comment \
+						   test.so
+
diff --git a/filter/test.cpp b/filter/test.cpp
new file mode 100644
index 0000000..0953539
--- /dev/null
+++ b/filter/test.cpp
@@ -0,0 +1,15 @@
+#include <cstdint>
+
+using adcsample_t = uint16_t;
+__attribute__((section(".process_data")))
+void process_data(adcsample_t *samples, unsigned int size);
+ 
+////////////////////////////////////////////////////////////////////////////////
+
+void process_data(adcsample_t *samples, unsigned int size)
+{
+    size--;
+    for (unsigned int i = 0; i < size; i++)
+        samples[i] = samples[i] * 80 / 100  + samples[i + 1] * 20 / 100;
+}
+
-- 
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