Diff: STMstation_synth.h

Revision:

0:c5ca205c0a80

Child:

1:db0c24aebb8a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/STMstation_synth.h	Mon Jul 03 08:16:42 2017 +0000
@@ -0,0 +1,84 @@
+#ifndef STMstation_synth_h
+#define STMstation_synth_h
+
+#include "mbed.h"
+#include "arm_math.h"
+#include "FastPWM.h"
+
+/** Basic synthesizer library for STM32F401RE Nucleo or STMstation P.1 development boards - may work with
+ *  other targets, but not tested yet.
+ *
+ *  This is a multi-channel synthesizer, with sine, square, triangle, and noise waveform generation. Music is 
+ *  stored as arrays in flash, but it is possible to use editable arrays in RAM. Standard number of channels is
+ *  5, but additional channels can be added by changing the CHANNELS define.
+ *  
+ *  Audio signal is output as a PWM signal on PB_0, which MUST be fed into a 1-bit DAC to generate sound!
+ *
+ *  Suggested setup:
+ *  @code
+ *      (PB_0)-----(R1)-----(C2) 
+ *                  |        |
+ *                 (C1)  (SPEAKER)
+ *                  |        |
+ *                 (GND)    (GND)
+ *      
+ *      R1 = 150 Ohms, C1 = 47nF, C2 = 1uF, Speaker = 0.25W, 8 Ohms
+ *  @endcode 
+ */
+
+#define AUDIO_PIN   PB_0
+#define CHANNELS    5
+
+//Audio melody struct
+struct melody{
+    const uint8_t * notes[CHANNELS];
+    const uint8_t * durations[CHANNELS]; 
+    const uint8_t * AR[CHANNELS]; 
+    const uint8_t * vol[CHANNELS];
+    uint16_t max[CHANNELS];
+    bool ended[CHANNELS], repeat[CHANNELS];
+    uint8_t bpm;
+};
+
+//Audio master struct
+struct master{
+    const uint8_t * notes[CHANNELS];
+    const uint8_t * durations[CHANNELS]; 
+    const uint8_t * AR[CHANNELS]; 
+    const uint8_t * vol[CHANNELS];
+    uint16_t index[CHANNELS], max[CHANNELS];
+    float env[CHANNELS], sineCoef[CHANNELS], vSum, atkSlope[CHANNELS], relSlope[CHANNELS], relOffset[CHANNELS], volCoef[CHANNELS], halfPeriod[CHANNELS], triSlope[CHANNELS], noiseVal[CHANNELS], triVal[CHANNELS];
+    uint32_t counter[CHANNELS], envAtkEnd[CHANNELS], envRelStart[CHANNELS];
+    uint8_t val, timbre[CHANNELS], freqIndex[CHANNELS], bpm[CHANNELS];
+    bool repeat[CHANNELS];
+    bool* endptr[CHANNELS];
+};
+
+class STMstation_synth{
+    public:
+        STMstation_synth();
+        
+        void calc_coefs(int i);
+        void calc_vSum2();
+        void calc_env();
+        int8_t square(float _halfperiod, uint16_t _counter);
+        void calc_triangle(uint8_t _channel, float _halfperiod, float _trislope, uint32_t _counter);
+        void calc_noise(uint8_t _channel, uint8_t _freq, uint32_t _counter);
+        void calc_val2();
+        void clear_channel(uint8_t _channel);
+        void stop_track(melody &newMelody);
+        bool check_track(melody &newMelody);
+        void check_end();
+        void check_start();
+        void note2();
+        void play(melody &newMelody, uint8_t refChannel = 0, uint16_t newIndex = 0);
+        
+        const uint16_t FSAMP;
+        const float period;
+        struct master Master;
+    private:
+        Ticker sample;
+        FastPWM tone;
+};
+
+#endif 
\ No newline at end of file