Add shared waveform processing, generation and firmware image support

c/set-protocol/ports/stm32g474-wavegen/set_wave_g474.h

@@ -0,0 +1,10 @@
+#ifndef SET_WAVE_G474_H
+#define SET_WAVE_G474_H
+#include "stm32g4xx_hal.h"
+#include "../../include/set_wavegen.h"
+/* CubeMX owns initialization: DAC1 channel1 PA4, TIM6 TRGO_UPDATE,
+ * DMA_REQUEST_DAC1_CHANNEL1, circular, halfword/halfword, memory increment.
+ * Supply TIM6 input clock, not APB bus clock. DMA buffer in SRAM. */
+typedef struct { DAC_HandleTypeDef *dac; TIM_HandleTypeDef *timer; uint32_t timer_hz; } set_wave_g474;
+set_wave_port set_wave_g474_port(set_wave_g474 *context);
+#endif