Add delay between starting DMA TX and SPI driver

esp-rs · Aug 2, 2024 · 35da5cc · 35da5cc
1 parent 69f8efd
commit 35da5cc
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/esp-hal/src/spi/master.rs b/esp-hal/src/spi/master.rs
@@ -2074,6 +2074,13 @@ pub trait InstanceDma: Instance {
         tx.start_transfer()?;
         reset_dma_before_usr_cmd(reg_block);
 
+        // Wait for at least one clock cycle for the DMA to fill the SPI async FIFO, before
+        // starting the SPI
+        #[cfg(riscv)]
+        riscv::asm::delay(1);
+        #[cfg(xtensa)]
+        xtensa_lx::timer::delay(1);
+
         reg_block.cmd().modify(|_, w| w.usr().set_bit());
 
         Ok(())