initcommit osclsk prototype

daisy/scope/osclsk.hpp

@@ -0,0 +1,115 @@
+#ifndef _OSCILLOSK_HPP
+#define _OSCILLOSK_HPP
+
+#include "daisy.h"
+
+#include "tft.hpp"
+
+using namespace daisy;
+
+
+#define OSCLSK_SCREEN_XSZ ILI9341_TFTHEIGHT
+#define OSCLSK_SCREEN_YSZ ILI9341_TFTWIDTH
+
+
+#define OSCLSK_RATE_DIV		32
+
+#define OSCLSK_BLOCK_LEN	OSCLSK_SCREEN_XSZ
+#define OSCLSK_TRIG_LOOKBACK	0x100
+
+#define OSCLSK_TFT_CMD_BUF_NSPLIT	4
+
+#define OSCLSK_CMDS_LEN			8 * OSCLSK_SCREEN_XSZ
+struct osclsk_scope {
+	enum class osc_cc {
+		FOREGROUND,
+		BACKGROUND
+	};
+
+	enum class osc_state {
+		INIT,
+		TRIGGER,
+		SAMPLE,
+		SAMPLE_DONE,
+		RENDER,
+		RENDER_DONE,
+		READY
+	};
+
+	enum class osc_trig_mode {
+		RISING_EDGE,
+		FALLING_EDGE,
+		ABS_THRESHOLD,
+	};
+
+	enum class osc_trig_state {
+		INIT,
+		READY,
+		NO_TRIG,
+		TRIG,
+		TRIGGERED
+	};
+
+	volatile osc_state	st;
+
+	float		block_y_max[OSCLSK_BLOCK_LEN];
+	float		block_y_min[OSCLSK_BLOCK_LEN];
+	size_t		block_fill;
+	int		block_fill_nsamp;
+
+	float		trig_lkb_y_max[OSCLSK_TRIG_LOOKBACK];
+	float		trig_lkb_y_min[OSCLSK_TRIG_LOOKBACK];
+	size_t		trig_lkb_idx;
+	int		trig_lkb_idx_nsamp;
+	size_t		trig_lkb_amount;
+
+	float		trig_margin;
+	size_t		trig_num;
+	size_t		trig_num_req;
+	osc_trig_state	trig_state;
+	osc_trig_mode	trig_mode;
+
+
+	uint16_t	rate_div;
+
+
+
+	tft_color			fg, bg;
+	tft_driver_ili9341		tft;
+
+	uint16_t	screen_px_y_max[OSCLSK_SCREEN_XSZ];
+	uint16_t	screen_px_y_min[OSCLSK_SCREEN_XSZ];
+
+	osclsk_scope(void) : st(osc_state::INIT),
+       	    block_fill(0), block_fill_nsamp(0),
+	    trig_lkb_idx(0), trig_lkb_idx_nsamp(0),
+	    trig_lkb_amount(2),
+	    trig_margin(.05f), trig_num(0),
+	    trig_num_req(2),
+	    trig_state(osc_trig_state::INIT),
+	    trig_mode(osc_trig_mode::RISING_EDGE)	{};
+
+	int init(uint8_t *dma_buf, size_t dma_sz);
+	int init_block(void);
+	int init_screen(void);
+
+	osc_state state(void);
+
+	void set_color(osc_cc which, const tft_color *to_what);
+
+	void sample(const float *sig, size_t num);
+	void sample_trigger(const float *sig, size_t num);
+
+	int wait_ready(int ms);
+	int prep(void);
+	int trig(void);
+
+	bool is_triggering(float sample);
+	void trig_lkb_wr_block(void);
+
+	int render_block(void);
+
+	static void render_finish_tft_cb(void *ctx);
+};
+
+#endif /* _OSCILLOSK_HPP */