rtl8195am: fix LogUART Tx interrupt crash

add Mask & UnMask Tx FIFO empty interrupt for LogUart
fix LogUart interrupt enable
fix LogUart interrupt handler
coding style fix

Author: M-ichae-l

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/log_uart_api.c

@@ -210,13 +210,13 @@ void log_uart_irq_handler(log_uart_t *obj, loguart_irq_handler handler, uint32_t
 
     pUartAdapter = &(obj->log_hal_uart);
     pUartAdapter->api_irq_handler = handler;
-    pUartAdapter->api_irq_id = id;    
+    pUartAdapter->api_irq_id = id;
 }
 
 void log_uart_irq_set(log_uart_t *obj, LOG_UART_INT_ID irq, uint32_t enable) 
 {
     HAL_LOG_UART_ADAPTER *pUartAdapter;
-    u8 int_en=0;
+    u8 int_en = 0;
 
     pUartAdapter = &(obj->log_hal_uart);
 
@@ -241,7 +241,7 @@ void log_uart_irq_set(log_uart_t *obj, LOG_UART_INT_ID irq, uint32_t enable)
         DBG_UART_WARN("log_uart_irq_set: Unknown Irq Id\n");
         return;
     }
-        
+
     if (enable) {
         pUartAdapter->IntEnReg |= int_en;
     } else {

targets/TARGET_Realtek/TARGET_AMEBA/TARGET_RTL8195A/serial_api.c

@@ -284,32 +284,29 @@ static void SerialRxDoneCallBack(VOID *pAdapter)
 #ifdef CONFIG_MBED_ENABLED
 static void serial_loguart_irq_handler(uint32_t id, LOG_UART_INT_ID event)
 {
-    if (event == IIR_RX_RDY || event == IIR_CHAR_TIMEOUT)
-    {
-        if (log_irq_handler) {
+    log_uart_irq_set(&stdio_uart_log, event, 0);
+    if (log_irq_handler) {
+        if (event == IIR_RX_RDY || event == IIR_CHAR_TIMEOUT) {
             log_irq_handler(serial_log_irq_ids, RxIrq);
-            }
-    } else if (event == IIR_THR_EMPTY) {
-        if (log_irq_handler) {
-                log_irq_handler(serial_log_irq_ids, TxIrq);
-            }
+        } else if (event == IIR_THR_EMPTY) {
+            log_irq_handler(serial_log_irq_ids, TxIrq);
+        }
     }
     return;
 }
 #endif
 
 
-
 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) 
 {
 
 #ifdef CONFIG_MBED_ENABLED
-            if (obj->index == UART_3) {
-                log_irq_handler = handler;
-                serial_log_irq_ids = id;
-                log_uart_irq_handler(&stdio_uart_log, serial_loguart_irq_handler, id);
-                return;
-            }             
+    if (obj->index == UART_3) {
+        log_irq_handler = handler;
+        serial_log_irq_ids = id;
+        log_uart_irq_handler(&stdio_uart_log, serial_loguart_irq_handler, id);
+        return;
+    }
 #endif
     PHAL_RUART_ADAPTER pHalRuartAdapter;
     u8 uart_idx;
@@ -326,14 +323,33 @@ void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) 
 {
 #ifdef CONFIG_MBED_ENABLED
-        if (obj->index == UART_3) {
+    if (obj->index == UART_3) {
+        if(enable) {
+            if (irq == RxIrq) {
+                log_uart_irq_set(&stdio_uart_log, IIR_RX_RDY, enable);
+                serial_log_irq_en |= SERIAL_RX_IRQ_EN;
+            } else {
+                log_uart_irq_set(&stdio_uart_log, IIR_THR_EMPTY, enable);
+                serial_log_irq_en |= SERIAL_TX_IRQ_EN;
+            }
+        } else {
             if (irq == RxIrq) {
                 log_uart_irq_set(&stdio_uart_log, IIR_RX_RDY, enable);
+                serial_log_irq_en &= ~SERIAL_RX_IRQ_EN;
             } else {
                 log_uart_irq_set(&stdio_uart_log, IIR_THR_EMPTY, enable);
+                serial_log_irq_en &= ~SERIAL_TX_IRQ_EN;
+            }
+
+            log_uart_t *log_obj = &stdio_uart_log;
+            HAL_LOG_UART_ADAPTER *pUartAdapter=(PHAL_LOG_UART_ADAPTER)&(log_obj->log_hal_uart);
+            if (pUartAdapter->IntEnReg == 0) {
+                InterruptUnRegister(&pUartAdapter->IrqHandle);
+                InterruptDis(&pUartAdapter->IrqHandle);
             }
-            return;
         }
+        return;
+    }
 #endif
     PHAL_RUART_ADAPTER pHalRuartAdapter;
     PHAL_RUART_OP pHalRuartOp;
@@ -352,7 +368,6 @@ void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
         }
 
         pHalRuartOp->HalRuartRegIrq(pHalRuartAdapter);
-        //log_uart
         pHalRuartOp->HalRuartIntEnable(pHalRuartAdapter);
     } else { // disable
         if (irq == RxIrq) {
@@ -394,6 +409,14 @@ void serial_putc(serial_t *obj, int c)
 #ifdef CONFIG_MBED_ENABLED
     if (obj->index == UART_3) {
         log_uart_putc(&stdio_uart_log, (char)c);
+
+        // UnMask LOG_UART TX FIFO empty IRQ
+        if (serial_log_irq_en & SERIAL_TX_IRQ_EN) {
+            log_uart_t *log_obj = &stdio_uart_log;
+            HAL_LOG_UART_ADAPTER *pUartAdapter=(PHAL_LOG_UART_ADAPTER)&(log_obj->log_hal_uart);
+            pUartAdapter->IntEnReg |= IER_ETBEI;
+            HalLogUartSetIntEn(pUartAdapter);
+        }
         return;
     }
 #endif