diff --git a/os/hal/ports/ADUCM/ADUCM36x/hal_spi_lld.c b/os/hal/ports/ADUCM/ADUCM36x/hal_spi_lld.c
index bcba887ed..580adcfb0 100644
--- a/os/hal/ports/ADUCM/ADUCM36x/hal_spi_lld.c
+++ b/os/hal/ports/ADUCM/ADUCM36x/hal_spi_lld.c
@@ -82,15 +82,16 @@ static void spi_lld_serve_interrupt(SPIDriver *spip) {
     }
     
     /* Pushing the new TX: this will start a new transfer. */
-    if((spip->txbuf != NULL) && (spip->size > 0)) {
-      (spip->txbuf)++;
-      spip->spi->SPITX = *(spip->txbuf);
+    if(spip->size > 0) {
+      if(spip->txbuf != NULL) {
+        (spip->txbuf)++;
+        spip->spi->SPITX = *(spip->txbuf);
+      }
+      else {
+        spip->spi->SPITX = dummy_tx;
+      }
     }
     else {
-      spip->spi->SPITX = dummy_tx;
-    }
-
-    if(spip->size == 0) {
       /* Portable SPI ISR code defined in the high level driver, note, it is
          a macro.*/
       _spi_isr_code(spip);
diff --git a/readme.txt b/readme.txt
index 5bcbbafcc..42021de01 100644
--- a/readme.txt
+++ b/readme.txt
@@ -74,6 +74,8 @@
 *****************************************************************************
 
 *** 20.3.2 ***
+- FIX: Fixed a wrong management of the SPI TX buffer in the ADUCM port 
+       (bug #1103).
 - FIX: Fixed STM32F4 EFL sector bug (bug #1102).
 - FIX: Fixed differences in STM32 EXTI (bug #1101).
 - FIX: Fixed STM32 DACv1 driver regressed because DMA changes (bug #1100).