Diff: Uart/usbhost_uart.c

Revision:

0:0826fcc5d020

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Uart/usbhost_uart.c	Wed Jan 13 01:29:30 2010 +0000
@@ -0,0 +1,144 @@
+/*
+**************************************************************************************************************
+*                                                 NXP USB Host Stack
+*
+*                                     (c) Copyright 2008, NXP SemiConductors
+*                                     (c) Copyright 2008, OnChip  Technologies LLC
+*                                                 All Rights Reserved
+*
+*                                                  www.nxp.com
+*                                               www.onchiptech.com
+*
+* File           : usbhost_uart.c
+* Programmer(s)  : Prasad.K.R.S.V
+* Version        :
+*
+**************************************************************************************************************
+*/
+
+/*
+**************************************************************************************************************
+*                                           INCLUDE HEADER FILES
+**************************************************************************************************************
+*/
+
+#include "usbhost_uart.h"
+
+/*
+**************************************************************************************************************
+*                                         INITIALIZE UART
+*
+* Description: This function initializes UART port, setup pin select, clock, parity, stopbits, FIFO etc
+*
+* Arguments  : baud_rate    UART baud rate (115200)
+*
+* Returns    : None
+*
+**************************************************************************************************************
+*/
+
+void  UART_Init(USB_INT32U baudrate)
+{
+    USB_INT32U  Fdiv;
+    USB_INT32U  pclkdiv, pclk;
+    uint32_t  SystemFrequency = SystemCoreClock;
+
+    LPC_PINCON->PINSEL0 |= 0x00000050;       /* RxD0 and TxD0 */
+
+    LPC_UART0->LCR = 0x83;        /* 8 bits, no Parity, 1 Stop bit */
+    /* Bit 6~7 is for UART0 clock divider. */
+    pclkdiv = (LPC_SC->PCLKSEL0 >> 6) & 0x03;
+    switch ( pclkdiv )
+    {
+      case 0x00:
+      default:
+        pclk = SystemFrequency/4;
+        break;
+      case 0x01:
+        pclk = SystemFrequency;
+        break; 
+      case 0x02:
+        pclk = SystemFrequency/2;
+        break; 
+      case 0x03:
+        pclk = SystemFrequency/8;
+        break;
+    }
+    Fdiv = ( pclk / 16 ) / baudrate ;    /*baud rate */
+    
+    LPC_UART0->DLM = Fdiv / 256;                            
+    LPC_UART0->DLL = Fdiv % 256;
+    LPC_UART0->LCR = 0x03;        /* DLAB = 0 */
+    LPC_UART0->FCR = 0x07;        /* Enable and reset TX and RX FIFO. */
+}
+
+/*
+**************************************************************************************************************
+*                                         PRINT CHARECTER
+*
+* Description: This function is used to print a single charecter through UART1.
+*
+* Arguments  : ch    charecter to be printed
+*
+* Returns    : None
+*
+**************************************************************************************************************
+*/
+
+void  UART_PrintChar (USB_INT08U ch)
+{
+
+   while (!(LPC_UART0->LSR & 0x20));
+   LPC_UART0->THR  = ch;
+}
+
+/*
+**************************************************************************************************************
+*                                         PRINT STRING
+*
+* Description: This function is used to print a string
+*
+* Arguments  : str    Pointer to the string
+*
+* Returns    : None
+*
+**************************************************************************************************************
+*/
+
+void  UART_PrintStr (const USB_INT08U * str)
+{
+
+   while ((*str) != 0) {
+      if (*str == '\n') {
+         UART_PrintChar(*str++);
+         UART_PrintChar('\r');
+      } else {
+         UART_PrintChar(*str++);
+      }    
+   }
+}
+
+/*
+**************************************************************************************************************
+*                                        PRINT FORMATTED STRING
+*
+* Description: This function is used to print formatted string. This function takes variable length arguments
+*
+* Arguments  : variable length arguments
+*
+* Returns    : None
+*
+**************************************************************************************************************
+*/
+
+void  UART_Printf (const  USB_INT08U *format, ...)
+{
+    static  USB_INT08U  buffer[40 + 1];
+            va_list     vArgs;
+
+
+    va_start(vArgs, format);
+    vsprintf((char *)buffer, (char const *)format, vArgs);
+    va_end(vArgs);
+    UART_PrintStr((USB_INT08U*) buffer);
+}