ESP32(SPI): Disable the write side when reading is being done in DMA … (#1894)

* ESP32(SPI): Disable the write side when reading is being done in DMA mode

* disable and re-enable MISO and MOSI in write and transfer methods

* changelog

esp-hal/CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix I2S async-tx (#1833)
 - Fix PARL_IO async-rx (#1851)
 - SPI: Clear DMA interrupts before (not after) DMA starts (#1859)
+- SPI: disable and re-enable MISO and MOSI in `start_transfer_dma`, `start_read_bytes_dma` and `start_write_bytes_dma` accordingly (#1894)
 
 ### Removed
 

esp-hal/src/spi/master.rs

@@ -2032,6 +2032,11 @@ where
         tx.is_done();
         rx.is_done();
 
+        // re-enable the MISO and MOSI
+        reg_block
+            .user()
+            .modify(|_, w| w.usr_miso().bit(true).usr_mosi().bit(true));
+
         self.enable_dma();
         self.update();
 
@@ -2082,6 +2087,11 @@ where
 
         tx.is_done();
 
+        // disable MISO and re-enable MOSI
+        reg_block
+            .user()
+            .modify(|_, w| w.usr_miso().bit(false).usr_mosi().bit(true));
+
         self.enable_dma();
         self.update();
 
@@ -2113,6 +2123,11 @@ where
 
         rx.is_done();
 
+        // re-enable MISO and disable MOSI
+        reg_block
+            .user()
+            .modify(|_, w| w.usr_miso().bit(true).usr_mosi().bit(false));
+
         self.enable_dma();
         self.update();