Store PPM in shared memory for now.

firmware/application/main.cpp

@@ -618,6 +618,7 @@ int main(void) {
 	}
 
 	init_message_queues();
+	shared_memory.correction_ppm = 0;
 
 	portapack::io.init();
 	ui::Context context;

firmware/application/radio.cpp

@@ -26,6 +26,7 @@
 #include "max5864.hpp"
 #include "baseband_cpld.hpp"
 #include "baseband_sgpio.hpp"
+#include "portapack_shared_memory.hpp"
 
 #include "tuning.hpp"
 
@@ -117,7 +118,7 @@ void set_direction(const rf::Direction new_direction) {
 }
 
 bool set_tuning_frequency(const rf::Frequency frequency) {
-	rf::Frequency corrected_frequency = frequency * (1000000 - 10) / 1000000;
+	rf::Frequency corrected_frequency = frequency * (1000000 + shared_memory.correction_ppm) / 1000000;
 	const auto tuning_config = tuning::config::create(corrected_frequency);
 	if( tuning_config.is_valid() ) {
 		first_if.disable();

firmware/application/ui_setup.cpp

@@ -21,6 +21,7 @@
 
 #include "ui_setup.hpp"
 
+#include "portapack_shared_memory.hpp"
 #include "lpc43xx_cpp.hpp"
 using namespace lpc43xx;
 
@@ -103,6 +104,7 @@ SetFrequencyCorrectionView::SetFrequencyCorrectionView(
 ) {
 	button_ok.on_select = [&nav, this](Button&){
 		const auto model = this->form_collect();
+		shared_memory.correction_ppm = model.ppm;
 		nav.pop();
 	},
 
@@ -119,7 +121,7 @@ SetFrequencyCorrectionView::SetFrequencyCorrectionView(
 	} });
 
 	SetFrequencyCorrectionModel model {
-		0
+		shared_memory.correction_ppm
 	};
 
 	form_init(model);

firmware/common/portapack_shared_memory.hpp

@@ -38,6 +38,7 @@ struct SharedMemory {
 	// TODO: M0 should directly configure and control DMA channel that is
 	// acquiring ADC samples.
 	TouchADCFrame touch_adc_frame;
+	int8_t correction_ppm;
 };
 
 extern SharedMemory& shared_memory;