Diff: nvt_rs485.cpp

Revision:

0:22be4d425fdb

Child:

1:783999122629

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nvt_rs485.cpp	Tue Sep 20 01:17:32 2016 +0000
@@ -0,0 +1,65 @@
+#include "nvt_rs485.h"
+#include "PeripheralPins.h"
+
+NvtRS485::NvtRS485(PinName tx, PinName rx, PinName dir, E_PFM pfm)
+    : Serial(tx, rx), m_ePFMID(pfm)
+{
+    this->set_rs485_mode(dir);
+}
+
+NvtRS485::~NvtRS485()
+{
+    
+}
+
+int NvtRS485::set_rs485_mode(PinName dir)
+{
+    int ret=0;
+    mbed::SerialBase *ptrSerialBase = (mbed::SerialBase *)this;
+    serial_t *obj = &_serial;
+    UART_T *uart_base = (UART_T *) NU_MODBASE(obj->serial.uart);
+
+    lock();    
+    // First, disable flow control completely.
+    uart_base->INTEN &= ~(UART_INTEN_ATORTSEN_Msk | UART_INTEN_ATOCTSEN_Msk);
+
+    //Implement RS485 mode for various platform of Nuvoton
+    switch (m_ePFMID) {
+        case NUC472: {
+            /*
+            Program Sequence example:
+                1. Program FUNCSEL in UART_FUNCSEL to select RS-485 function.
+                2. Program the RXOFF bit (UART_FIFO[8]) to determine enable or disable RS-485 receiver
+                3. Program the RS-485_NMM or RS-485_AAD mode.
+                4. If the RS-485_AAD mode is selected, the ADDRMV (UART_ALTCTL[31:24]) is programmed for auto address match value.
+                5. Determine auto direction control by programming RS-485_AUD.
+            */
+
+            // Check if RTS pin matches.
+            uint32_t uart_rts = pinmap_peripheral(dir, PinMap_UART_RTS);
+            MBED_ASSERT(uart_rts == obj->serial.uart);
+
+            // Enable the pin for RTS function
+            pinmap_pinout(dir, PinMap_UART_RTS);
+
+            uart_base->FUNCSEL = (uart_base->FUNCSEL & ~UART_FUNCSEL_FUNCSEL_Msk) | 0x3;
+            uart_base->ALTCTL  = (uart_base->ALTCTL & ~UART_ALTCTL_RS485AUD_Msk) | UART_ALTCTL_RS485AUD_Msk;
+
+            // nRTS pin output is high level active
+            //uart_base->MODEM = (uart_base->MODEM & ~UART_MODEM_RTSACTLV_Msk) | UART_MODEM_RTSACTLV_Msk;
+            uart_base->MODEM = (uart_base->MODEM & ~UART_MODEM_RTSACTLV_Msk);
+            //uart_base->FIFO = (uart_base->FIFO & ~UART_FIFO_RTSTRGLV_Msk);
+            uart_base->FIFO = (uart_base->FIFO & ~UART_FIFO_RTSTRGLV_Msk) | (0x2 << UART_FIFO_RTSTRGLV_Pos);
+
+            // Enable RTS
+            //uart_base->INTEN |= UART_INTEN_ATORTSEN_Msk;
+        }
+        break;
+        
+        default:
+            break;
+    } 
+    unlock();
+    
+    return ret;
+}
\ No newline at end of file