Diff: targets/TARGET_NUVOTON/TARGET_M451/serial_api.c

Revision:

185:08ed48f1de7f

Parent:

177:447f873cad2f

--- a/targets/TARGET_NUVOTON/TARGET_M451/serial_api.c	Tue Mar 20 17:01:51 2018 +0000
+++ b/targets/TARGET_NUVOTON/TARGET_M451/serial_api.c	Thu Apr 19 17:12:19 2018 +0100
@@ -503,6 +503,10 @@
         // Register DMA event handler
         dma_set_handler(obj->serial.dma_chn_id_tx, (uint32_t) uart_dma_handler_tx, (uint32_t) obj, DMA_EVENT_ALL);
         serial_tx_enable_interrupt(obj, handler, 1);
+        /* We needn't actually enable UART INT to go UART ISR -> handler.
+         * Instead, as PDMA INT is triggered, we will go PDMA ISR -> UART ISR -> handler
+         * with serial_tx/rx_enable_interrupt having set up this call path. */
+        UART_DISABLE_INT(((UART_T *) NU_MODBASE(obj->serial.uart)), UART_INTEN_THREIEN_Msk);
         ((UART_T *) NU_MODBASE(obj->serial.uart))->INTEN |= UART_INTEN_TXPDMAEN_Msk;  // Start DMA transfer
     }
     
@@ -566,6 +570,10 @@
         // Register DMA event handler
         dma_set_handler(obj->serial.dma_chn_id_rx, (uint32_t) uart_dma_handler_rx, (uint32_t) obj, DMA_EVENT_ALL);
         serial_rx_enable_interrupt(obj, handler, 1);
+        /* We needn't actually enable UART INT to go UART ISR -> handler.
+         * Instead, as PDMA INT is triggered, we will go PDMA ISR -> UART ISR -> handler
+         * with serial_tx/rx_enable_interrupt having set up this call path. */
+        UART_DISABLE_INT(((UART_T *) NU_MODBASE(obj->serial.uart)), (UART_INTEN_RDAIEN_Msk | UART_INTEN_RXTOIEN_Msk));
         ((UART_T *) NU_MODBASE(obj->serial.uart))->INTEN |= UART_INTEN_RXPDMAEN_Msk;  // Start DMA transfer
     }
 }