solution detached from main for async buffered generalized2

dma_gpio/src/bin/main.rs

@@ -25,7 +25,7 @@ static PIPE: Pipe<CriticalSectionRawMutex, 256> = Pipe::new();
 // Baud rate: one TIM6 update equals one UART bit-time
 const BAUD: u32 = 115_200;
 const TX_PIN_BIT: u8 = 2; // PA2
-const OVERSAMPLE: u16 = 6;
+const OVERSAMPLE: u16 = 16;
 
 const UART_CFG: UartConfig = UartConfig {
     data_bits: 8,
@@ -125,7 +125,7 @@ async fn dma_tx_task(ch: Peri<'static, GPDMA1_CH0>) {
         {
             Ok(()) => {}
             Err(_) => {
-                warn!("DMA timeout: no TIM6 request (wrong DMAMUX req?)");
+                warn!("DMA timeout: no TIM6 request");
                 dump_tim6_regs();
                 dump_dma_ch0_regs();
             }