usbhal.c

LPC2148 USB固件程序,是学习固件不可多的的范例.

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			USBHAL.c
** Last modified Date:	2005-8-6
** Last Version:		V1.0
** Descriptions:		USBHAL.c, 硬件抽象层,设置 USB 设备的运行条件
**						USBHAL.c, Hardware abstract layer, configure the running condition of USB device
**------------------------------------------------------------------------------------------------------
** Created by:			郑明远 		MingYuan Zheng
** Created date:		2005-8-6
** Version:				V1.0
** Descriptions:		初始版本	The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:			
** Modified date:
** Version:				
** Descriptions:
**
**------------------------------------------------------------------------------------------------------
** Modified by: 
** Modified date:
** Version:	
** Descriptions: 
**
********************************************************************************************************/

/**************************************************************************************
PLL1:			USB device PLL clock

P0.23:   		VBUS — Indicates the presence of USB bus power.
P0.31:   		UP_LED  --- USB Good Link LED indicator. or 
	 	 		CONNECT --- signal used to switch an external 1.5K resistor under software control   
P0.26(Pin 10):	USB D+	 
P0.27(Pin 11):  USB D-

USB Interrupt VIC = 22
**************************************************************************************/

#include  "config.h"

#include  "USBConfig.h"
#include  "USBCI.h"
#include  "USBHAL.h"

/*******************************************************************************************************************
** 函数名称: USB_ConfigPll						Name:	  USB_ConfigPll
** 功能描述: 配置 USB 设备控制器的时钟			Function: Config the clock of USB device controller 
** 注	 意: PLL的输出必须是 12MHZ 的整数倍,	Note:	  The output frequency of the PLL must the Multiplier of 12MHZ,
             而且必须是 2 倍以上.						  and it must be above 2 times.
********************************************************************************************************************/
void USB_ConfigPll(void)
{
	/* 外部 Fosc = 12MHz, 配置 PLL1 输出值为 48MHz. Fosc = 12MHz, Configure PLL1 (USB PLL) for 48 MHz. */
	PLL1CFG = 0x23;											/* P = 2, M = 4 */
	PLL1CON = 0x1;  										/* Enable PLL1 */
	PLL1FEED = 0xAA; 		  								
	PLL1FEED = 0x55; 										/* PLL Feed */
	
	while((PLL1STAT & 0x400) == 0);							/* 等待 PLL1 锁定 */
  
	PLL1CON = 0x3;   										/* Enable and connect*/
	PLL1FEED = 0xaa; 										
	PLL1FEED = 0x55; 										/* PLL Feed part 2 */
}


/*******************************************************************************************************************
** 函数名称: USB_InitHareware					Name:	  USB_InitHareware
** 功能描述: 初始化 USB 设备控制器硬件			Function: Initialize the hardware of USB device controller 
********************************************************************************************************************/
void USB_InitHareware(void)
{
	USB_ConfigPll();										/* 配置USB时钟            config USB clock */

	PINSEL1 &= ~(0x03U << 30); 		
 	PINSEL1 |= (0x02U << 30);								/* P0.31为SoftConnect引脚 P0.31 is SoftConnect Pin */
 	
	PINSEL1 &= ~(0x03U << 14); 		
 	PINSEL1 |= (0x01U << 14);								/* P0.23为 Vbus 引脚      P0.23 is Vbus Pin */

  	PCONP |= 0x80000000;									/* 给USB控制器提供电源    power on USB controller */
}


/*******************************************************************************************************************
** 函数名称: USB_USBDevIntConfig				Name:	  USB_USBDevIntConfig
** 功能描述: 配置USB设备控制器的中断			Function: Config the Interrupt of USB device controller 
********************************************************************************************************************/
void USB_USBDevIntConfig(void)
{
	INT32U tmp = EP_SLOW;
				
    // Clears the frame interrupt flag in USBDevIntClr
    USBDevIntClr = FRAME;									/* 禁止同步传输帧中断 */

	// Enables ep_slow and dev_stat interrupt only in USBDevIntEn 
    USBDevIntEn = tmp;										/* 使能复位中断, 低速中断 */
      
	// the EP_FAST interrupt is slow priority interrupt
    USBDevIntPri = 0; 				  						/* 使能端点中断为低优先级中断 */

#if DMA_ENGINE_EN
	tmp = (0x01 << 0) + (0x01 << 1);						/* 使能控制传输端点从机中断 */
#else
	tmp = (0x01 << 0) + (0x01 << 1) + (0x01 << 2) + 
	      (0x01 << 3) + (0x01 << 4) + (0x01 << 5);			/* 使能端点 0 ~ 5 从机中断 */
#endif
		
	// Enable Endpoint Interrupt: endpoint 0 ~ 5
	USBEPIntEn = tmp;	  									/* 使能物理端点 0 ~ 5中断 */
	
	// Routes all endp ints to the ep_slow int USBEpIntPri
    USBEpIntPri &= ~tmp;									/* 设置物理端点 0 ~ 5为低优先级中断 */

}

/*******************************************************************************************************
**                            End Of File
********************************************************************************************************/