3 files changed, 42 insertions, 3 deletions
diff --git a/Core/Inc/Effects/ringmod.h b/Core/Inc/Effects/ringmod.h
new file mode 100755
index 0000000..42cb229
--- /dev/null
+++ b/Core/Inc/Effects/ringmod.h
@@ -0,0 +1,16 @@
+/*
+ * ringmod.h
+ *
+ *  Created on: Aug 19, 2026
+ *      Author: ozpv
+ */
+
+#ifndef INC_EFFECTS_RINGMOD_H_
+#define INC_EFFECTS_RINGMOD_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+void ringmod(float *samples, size_t range_min, size_t range_max);
+
+#endif /* INC_EFFECTS_RINGMOD_H_ */
diff --git a/Core/Inc/cs4272.h b/Core/Inc/cs4272.h
index 30e493a..423b7c0 100755
--- a/Core/Inc/cs4272.h
+++ b/Core/Inc/cs4272.h
@@ -8,7 +8,9 @@
 #ifndef INC_CS4272_H_
 #define INC_CS4272_H_
 
-// cs4272k-czzr 7. REGISTER QUICK REFERENCE
+#include <stdint.h>
+
+/* cs4272k-czzr 7. REGISTER QUICK REFERENCE */
 #define MODE_CONTROL_1 0x01
 #define DAC_CONTROL 0x02
 #define DAC_VOLUME_AND_MIXING_CONTROL 0x03
@@ -20,16 +22,20 @@
 
 #define CS4272_CHIP_ID 0x0
 
-// set by ncs/ad0 pin
+/* set by ad0 ncs pin */
 #define CS4272_I2C_ADDR (0b0010000 << 1)
 
+#define SAMPLE_RATE 48000
 #define BUFFER_SIZE 512
 
 extern volatile int32_t rx_buffer[BUFFER_SIZE];
 extern volatile int32_t tx_buffer[BUFFER_SIZE];
+extern volatile float samples[BUFFER_SIZE];
 
 extern const uint8_t CS4272_CONFIG[7];
 
-uint8_t CS4272_Init();
+uint8_t CS4272_Init(void);
+
+#define INT24_MAX 0x7FFFFF
 
 #endif /* INC_CS4272_H_ */
diff --git a/Core/Inc/w9825g6kh6.h b/Core/Inc/w9825g6kh6.h
new file mode 100755
index 0000000..3e4f043
--- /dev/null
+++ b/Core/Inc/w9825g6kh6.h
@@ -0,0 +1,17 @@
+/*
+ * w9825g6kh6.h
+ *
+ *  Created on: Aug 18, 2026
+ *      Author: ozpv
+ */
+
+#ifndef INC_W9825G6KH6_H_
+#define INC_W9825G6KH6_H_
+
+#define SDRAM_BASE 0xC0000000
+#define SDRAM_SIZE 0x02000000
+
+void FMC_Init(void);
+void SDRAM_Test(void);
+
+#endif /* INC_W9825G6KH6_H_ */