ready for dma implemenatation

.gitignore

@@ -0,0 +1 @@
+*.pdf

datasheet.txt

@@ -0,0 +1 @@
+https://www.st.com/content/ccc/resource/technical/document/reference_manual/group0/f3/60/ca/d2/98/c8/47/88/DM00477635/files/DM00477635.pdf/jcr:content/translations/en.DM00477635.pdf

dma_gpio/src/bin/main.rs

@@ -12,6 +12,14 @@ use embassy_sync::{
 use embassy_time::{Duration, Timer};
 use {defmt_rtt as _, panic_probe as _};
 
+use embassy_stm32::{
+    gpio::{Level, Output, Speed},
+    pac::{self, GPDMA1, GPIOB, dmamux},
+    peripherals::TIM6,
+    rcc,
+    timer::low_level::Timer as LlTimer,
+};
+
 static PIPE: Pipe<CriticalSectionRawMutex, 64> = Pipe::new();
 
 #[embassy_executor::main]