Igor Skochinsky
Implementation of USB Host for mbed 1768 which can access USB flash drives. See notebook page for details.
Dependencies: FatFileSystemCpp mbed
Diff: USBHostLite/usbhost_lpc17xx.c
- Revision:
- 1:ad941ffd64cb
- Parent:
- 0:e294af8d0e07
- Child:
- 2:49ec3b833a28
--- a/USBHostLite/usbhost_lpc17xx.c Tue Jan 26 23:25:56 2010 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,820 +0,0 @@
-/*
-**************************************************************************************************************
-* 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_lpc17xx.c
-* Programmer(s) : Ravikanth.P
-* Version :
-*
-**************************************************************************************************************
-*/
-
-/*
-**************************************************************************************************************
-* INCLUDE HEADER FILES
-**************************************************************************************************************
-*/
-
-#include "usbhost_lpc17xx.h"
-
-/*
-**************************************************************************************************************
-* GLOBAL VARIABLES
-**************************************************************************************************************
-*/
-int gUSBConnected;
-
-volatile USB_INT32U HOST_RhscIntr = 0; /* Root Hub Status Change interrupt */
-volatile USB_INT32U HOST_WdhIntr = 0; /* Semaphore to wait until the TD is submitted */
-volatile USB_INT08U HOST_TDControlStatus = 0;
-volatile HCED *EDCtrl; /* Control endpoint descriptor structure */
-volatile HCED *EDBulkIn; /* BulkIn endpoint descriptor structure */
-volatile HCED *EDBulkOut; /* BulkOut endpoint descriptor structure */
-volatile HCTD *TDHead; /* Head transfer descriptor structure */
-volatile HCTD *TDTail; /* Tail transfer descriptor structure */
-volatile HCCA *Hcca; /* Host Controller Communications Area structure */
- USB_INT16U *TDBufNonVol; /* Identical to TDBuffer just to reduce compiler warnings */
-volatile USB_INT08U *TDBuffer; /* Current Buffer Pointer of transfer descriptor */
-
-// USB host structures
-// AHB SRAM block 1
-#define HOSTBASEADDR 0x2007C000
-// reserve memory for the linker
-static USB_INT08U HostBuf[0x200] __attribute__((at(HOSTBASEADDR)));
-/*
-**************************************************************************************************************
-* DELAY IN MILLI SECONDS
-*
-* Description: This function provides a delay in milli seconds
-*
-* Arguments : delay The delay required
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void Host_DelayMS (USB_INT32U delay)
-{
- volatile USB_INT32U i;
-
-
- for (i = 0; i < delay; i++) {
- Host_DelayUS(1000);
- }
-}
-
-/*
-**************************************************************************************************************
-* DELAY IN MICRO SECONDS
-*
-* Description: This function provides a delay in micro seconds
-*
-* Arguments : delay The delay required
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void Host_DelayUS (USB_INT32U delay)
-{
- volatile USB_INT32U i;
-
-
- for (i = 0; i < (4 * delay); i++) { /* This logic was tested. It gives app. 1 micro sec delay */
- ;
- }
-}
-
-// bits of the USB/OTG clock control register
-#define HOST_CLK_EN (1<<0)
-#define DEV_CLK_EN (1<<1)
-#define PORTSEL_CLK_EN (1<<3)
-#define AHB_CLK_EN (1<<4)
-
-// bits of the USB/OTG clock status register
-#define HOST_CLK_ON (1<<0)
-#define DEV_CLK_ON (1<<1)
-#define PORTSEL_CLK_ON (1<<3)
-#define AHB_CLK_ON (1<<4)
-
-// we need host clock, OTG/portsel clock and AHB clock
-#define CLOCK_MASK (HOST_CLK_EN | PORTSEL_CLK_EN | AHB_CLK_EN)
-
-/*
-**************************************************************************************************************
-* INITIALIZE THE HOST CONTROLLER
-*
-* Description: This function initializes lpc17xx host controller
-*
-* Arguments : None
-*
-* Returns :
-*
-**************************************************************************************************************
-*/
-void Host_Init (void)
-{
- PRINT_Log("In Host_Init\n");
- NVIC_DisableIRQ(USB_IRQn); /* Disable the USB interrupt source */
-
- // turn on power for USB
- LPC_SC->PCONP |= (1UL<<31);
- // Enable USB host clock, port selection and AHB clock
- LPC_USB->USBClkCtrl |= CLOCK_MASK;
- // Wait for clocks to become available
- while ((LPC_USB->USBClkSt & CLOCK_MASK) != CLOCK_MASK)
- ;
-
- // it seems the bits[0:1] mean the following
- // 0: U1=device, U2=host
- // 1: U1=host, U2=host
- // 2: reserved
- // 3: U1=host, U2=device
- // NB: this register is only available if OTG clock (aka "port select") is enabled!!
- // since we don't care about port 2, set just bit 0 to 1 (U1=host)
- LPC_USB->OTGStCtrl |= 1;
-
- // now that we've configured the ports, we can turn off the portsel clock
- LPC_USB->USBClkCtrl &= ~PORTSEL_CLK_EN;
-
- // power pins are not connected on mbed, so we can skip them
- /* P1[18] = USB_UP_LED, 01 */
- /* P1[19] = /USB_PPWR, 10 */
- /* P1[22] = USB_PWRD, 10 */
- /* P1[27] = /USB_OVRCR, 10 */
- /*LPC_PINCON->PINSEL3 &= ~((3<<4) | (3<<6) | (3<<12) | (3<<22));
- LPC_PINCON->PINSEL3 |= ((1<<4)|(2<<6) | (2<<12) | (2<<22)); // 0x00802080
- */
-
- // configure USB D+/D- pins
- /* P0[29] = USB_D+, 01 */
- /* P0[30] = USB_D-, 01 */
- LPC_PINCON->PINSEL1 &= ~((3<<26) | (3<<28));
- LPC_PINCON->PINSEL1 |= ((1<<26)|(1<<28)); // 0x14000000
-
- PRINT_Log("Initializing Host Stack\n");
-
- Hcca = (volatile HCCA *)(HostBuf+0x000);
- TDHead = (volatile HCTD *)(HostBuf+0x100);
- TDTail = (volatile HCTD *)(HostBuf+0x110);
- EDCtrl = (volatile HCED *)(HostBuf+0x120);
- EDBulkIn = (volatile HCED *)(HostBuf+0x130);
- EDBulkOut = (volatile HCED *)(HostBuf+0x140);
- TDBuffer = (volatile USB_INT08U *)(HostBuf+0x150);
-
- /* Initialize all the TDs, EDs and HCCA to 0 */
- Host_EDInit(EDCtrl);
- Host_EDInit(EDBulkIn);
- Host_EDInit(EDBulkOut);
- Host_TDInit(TDHead);
- Host_TDInit(TDTail);
- Host_HCCAInit(Hcca);
-
- Host_DelayMS(50); /* Wait 50 ms before apply reset */
- LPC_USB->HcControl = 0; /* HARDWARE RESET */
- LPC_USB->HcControlHeadED = 0; /* Initialize Control list head to Zero */
- LPC_USB->HcBulkHeadED = 0; /* Initialize Bulk list head to Zero */
-
- /* SOFTWARE RESET */
- LPC_USB->HcCommandStatus = OR_CMD_STATUS_HCR;
- LPC_USB->HcFmInterval = DEFAULT_FMINTERVAL; /* Write Fm Interval and Largest Data Packet Counter */
-
- /* Put HC in operational state */
- LPC_USB->HcControl = (LPC_USB->HcControl & (~OR_CONTROL_HCFS)) | OR_CONTROL_HC_OPER;
- LPC_USB->HcRhStatus = OR_RH_STATUS_LPSC; /* Set Global Power */
-
- LPC_USB->HcHCCA = (USB_INT32U)Hcca;
- LPC_USB->HcInterruptStatus |= LPC_USB->HcInterruptStatus; /* Clear Interrrupt Status */
-
-
- LPC_USB->HcInterruptEnable = OR_INTR_ENABLE_MIE |
- OR_INTR_ENABLE_WDH |
- OR_INTR_ENABLE_RHSC;
-
- NVIC_SetPriority(USB_IRQn, 0); /* highest priority */
- /* Enable the USB Interrupt */
- NVIC_EnableIRQ(USB_IRQn);
- PRINT_Log("Host Initialized\n");
-}
-
-/*
-**************************************************************************************************************
-* INTERRUPT SERVICE ROUTINE
-*
-* Description: This function services the interrupt caused by host controller
-*
-* Arguments : None
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void USB_IRQHandler (void) __irq
-{
- USB_INT32U int_status;
- USB_INT32U ie_status;
-
- int_status = LPC_USB->HcInterruptStatus; /* Read Interrupt Status */
- ie_status = LPC_USB->HcInterruptEnable; /* Read Interrupt enable status */
-
- if (!(int_status & ie_status)) {
- return;
- } else {
-
- int_status = int_status & ie_status;
- if (int_status & OR_INTR_STATUS_RHSC) { /* Root hub status change interrupt */
- if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CSC) {
- if (LPC_USB->HcRhStatus & OR_RH_STATUS_DRWE) {
- /*
- * When DRWE is on, Connect Status Change
- * means a remote wakeup event.
- */
- HOST_RhscIntr = 1;// JUST SOMETHING FOR A BREAKPOINT
- }
- else {
- /*
- * When DRWE is off, Connect Status Change
- * is NOT a remote wakeup event
- */
- if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_CCS) {
- if (!gUSBConnected) {
- HOST_TDControlStatus = 0;
- HOST_WdhIntr = 0;
- HOST_RhscIntr = 1;
- gUSBConnected = 1;
- }
- else
- PRINT_Log("Spurious status change (connected)?\n");
- } else {
- if (gUSBConnected) {
- LPC_USB->HcInterruptEnable = 0; // why do we get multiple disc. rupts???
- HOST_RhscIntr = 0;
- gUSBConnected = 0;
- }
- else
- PRINT_Log("Spurious status change (disconnected)?\n");
- }
- }
- LPC_USB->HcRhPortStatus1 = OR_RH_PORT_CSC;
- }
- if (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_PRSC) {
- LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC;
- }
- }
- if (int_status & OR_INTR_STATUS_WDH) { /* Writeback Done Head interrupt */
- HOST_WdhIntr = 1;
- HOST_TDControlStatus = (TDHead->Control >> 28) & 0xf;
- }
- LPC_USB->HcInterruptStatus = int_status; /* Clear interrupt status register */
- }
- return;
-}
-
-/*
-**************************************************************************************************************
-* PROCESS TRANSFER DESCRIPTOR
-*
-* Description: This function processes the transfer descriptor
-*
-* Arguments : ed Endpoint descriptor that contains this transfer descriptor
-* token SETUP, IN, OUT
-* buffer Current Buffer Pointer of the transfer descriptor
-* buffer_len Length of the buffer
-*
-* Returns : OK if TD submission is successful
-* ERROR if TD submission fails
-*
-**************************************************************************************************************
-*/
-
-USB_INT32S Host_ProcessTD (volatile HCED *ed,
- volatile USB_INT32U token,
- volatile USB_INT08U *buffer,
- USB_INT32U buffer_len)
-{
- volatile USB_INT32U td_toggle;
-
-
- if (ed == EDCtrl) {
- if (token == TD_SETUP) {
- td_toggle = TD_TOGGLE_0;
- } else {
- td_toggle = TD_TOGGLE_1;
- }
- } else {
- td_toggle = 0;
- }
- TDHead->Control = (TD_ROUNDING |
- token |
- TD_DELAY_INT(0) |
- td_toggle |
- TD_CC);
- TDTail->Control = 0;
- TDHead->CurrBufPtr = (USB_INT32U) buffer;
- TDTail->CurrBufPtr = 0;
- TDHead->Next = (USB_INT32U) TDTail;
- TDTail->Next = 0;
- TDHead->BufEnd = (USB_INT32U)(buffer + (buffer_len - 1));
- TDTail->BufEnd = 0;
-
- ed->HeadTd = (USB_INT32U)TDHead | ((ed->HeadTd) & 0x00000002);
- ed->TailTd = (USB_INT32U)TDTail;
- ed->Next = 0;
-
- if (ed == EDCtrl) {
- LPC_USB->HcControlHeadED = (USB_INT32U)ed;
- LPC_USB->HcCommandStatus = LPC_USB->HcCommandStatus | OR_CMD_STATUS_CLF;
- LPC_USB->HcControl = LPC_USB->HcControl | OR_CONTROL_CLE;
- } else {
- LPC_USB->HcBulkHeadED = (USB_INT32U)ed;
- LPC_USB->HcCommandStatus = LPC_USB->HcCommandStatus | OR_CMD_STATUS_BLF;
- LPC_USB->HcControl = LPC_USB->HcControl | OR_CONTROL_BLE;
- }
-
- Host_WDHWait();
-
-// if (!(TDHead->Control & 0xF0000000)) {
- if (!HOST_TDControlStatus) {
- return (OK);
- } else {
- return (ERR_TD_FAIL);
- }
-}
-
-/*
-**************************************************************************************************************
-* ENUMERATE THE DEVICE
-*
-* Description: This function is used to enumerate the device connected
-*
-* Arguments : None
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-USB_INT32S Host_EnumDev (void)
-{
- USB_INT32S rc;
-
- PRINT_Log("Connect a Mass Storage device\n");
- while (!HOST_RhscIntr)
- __WFI();
- Host_DelayMS(100); /* USB 2.0 spec says atleast 50ms delay beore port reset */
- LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRS; // Initiate port reset
- while (LPC_USB->HcRhPortStatus1 & OR_RH_PORT_PRS)
- __WFI(); // Wait for port reset to complete...
- LPC_USB->HcRhPortStatus1 = OR_RH_PORT_PRSC; // ...and clear port reset signal
- Host_DelayMS(200); /* Wait for 100 MS after port reset */
-
- EDCtrl->Control = 8 << 16; /* Put max pkt size = 8 */
- /* Read first 8 bytes of device desc */
- rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_DEVICE, 0, TDBuffer, 8);
- if (rc != OK) {
- PRINT_Err(rc);
- return (rc);
- }
- EDCtrl->Control = TDBuffer[7] << 16; /* Get max pkt size of endpoint 0 */
- rc = HOST_SET_ADDRESS(1); /* Set the device address to 1 */
- if (rc != OK) {
- PRINT_Err(rc);
- return (rc);
- }
- Host_DelayMS(2);
- EDCtrl->Control = (EDCtrl->Control) | 1; /* Modify control pipe with address 1 */
- /* Get the configuration descriptor */
- rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_CONFIGURATION, 0, TDBuffer, 9);
- if (rc != OK) {
- PRINT_Err(rc);
- return (rc);
- }
- /* Get the first configuration data */
- rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_CONFIGURATION, 0, TDBuffer, ReadLE16U(&TDBuffer[2]));
- if (rc != OK) {
- PRINT_Err(rc);
- return (rc);
- }
- rc = MS_ParseConfiguration(); /* Parse the configuration */
- if (rc != OK) {
- PRINT_Err(rc);
- return (rc);
- }
- rc = USBH_SET_CONFIGURATION(1); /* Select device configuration 1 */
- if (rc != OK) {
- PRINT_Err(rc);
- }
- Host_DelayMS(100); /* Some devices may require this delay */
- return (rc);
-}
-
-/*
-**************************************************************************************************************
-* RECEIVE THE CONTROL INFORMATION
-*
-* Description: This function is used to receive the control information
-*
-* Arguments : bm_request_type
-* b_request
-* w_value
-* w_index
-* w_length
-* buffer
-*
-* Returns : OK if Success
-* ERROR if Failed
-*
-**************************************************************************************************************
-*/
-
-USB_INT32S Host_CtrlRecv ( USB_INT08U bm_request_type,
- USB_INT08U b_request,
- USB_INT16U w_value,
- USB_INT16U w_index,
- USB_INT16U w_length,
- volatile USB_INT08U *buffer)
-{
- USB_INT32S rc;
-
-
- Host_FillSetup(bm_request_type, b_request, w_value, w_index, w_length);
- rc = Host_ProcessTD(EDCtrl, TD_SETUP, TDBuffer, 8);
- if (rc == OK) {
- if (w_length) {
- rc = Host_ProcessTD(EDCtrl, TD_IN, TDBuffer, w_length);
- }
- if (rc == OK) {
- rc = Host_ProcessTD(EDCtrl, TD_OUT, NULL, 0);
- }
- }
- return (rc);
-}
-
-/*
-**************************************************************************************************************
-* SEND THE CONTROL INFORMATION
-*
-* Description: This function is used to send the control information
-*
-* Arguments : None
-*
-* Returns : OK if Success
-* ERR_INVALID_BOOTSIG if Failed
-*
-**************************************************************************************************************
-*/
-
-USB_INT32S Host_CtrlSend ( USB_INT08U bm_request_type,
- USB_INT08U b_request,
- USB_INT16U w_value,
- USB_INT16U w_index,
- USB_INT16U w_length,
- volatile USB_INT08U *buffer)
-{
- USB_INT32S rc;
-
-
- Host_FillSetup(bm_request_type, b_request, w_value, w_index, w_length);
-
- rc = Host_ProcessTD(EDCtrl, TD_SETUP, TDBuffer, 8);
- if (rc == OK) {
- if (w_length) {
- rc = Host_ProcessTD(EDCtrl, TD_OUT, TDBuffer, w_length);
- }
- if (rc == OK) {
- rc = Host_ProcessTD(EDCtrl, TD_IN, NULL, 0);
- }
- }
- return (rc);
-}
-
-/*
-**************************************************************************************************************
-* FILL SETUP PACKET
-*
-* Description: This function is used to fill the setup packet
-*
-* Arguments : None
-*
-* Returns : OK if Success
-* ERR_INVALID_BOOTSIG if Failed
-*
-**************************************************************************************************************
-*/
-
-void Host_FillSetup (USB_INT08U bm_request_type,
- USB_INT08U b_request,
- USB_INT16U w_value,
- USB_INT16U w_index,
- USB_INT16U w_length)
-{
- int i;
- for (i=0;i<w_length;i++)
- TDBuffer[i] = 0;
-
- TDBuffer[0] = bm_request_type;
- TDBuffer[1] = b_request;
- WriteLE16U(&TDBuffer[2], w_value);
- WriteLE16U(&TDBuffer[4], w_index);
- WriteLE16U(&TDBuffer[6], w_length);
-}
-
-
-
-/*
-**************************************************************************************************************
-* INITIALIZE THE TRANSFER DESCRIPTOR
-*
-* Description: This function initializes transfer descriptor
-*
-* Arguments : Pointer to TD structure
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void Host_TDInit (volatile HCTD *td)
-{
-
- td->Control = 0;
- td->CurrBufPtr = 0;
- td->Next = 0;
- td->BufEnd = 0;
-}
-
-/*
-**************************************************************************************************************
-* INITIALIZE THE ENDPOINT DESCRIPTOR
-*
-* Description: This function initializes endpoint descriptor
-*
-* Arguments : Pointer to ED strcuture
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void Host_EDInit (volatile HCED *ed)
-{
-
- ed->Control = 0;
- ed->TailTd = 0;
- ed->HeadTd = 0;
- ed->Next = 0;
-}
-
-/*
-**************************************************************************************************************
-* INITIALIZE HOST CONTROLLER COMMUNICATIONS AREA
-*
-* Description: This function initializes host controller communications area
-*
-* Arguments : Pointer to HCCA
-*
-* Returns :
-*
-**************************************************************************************************************
-*/
-
-void Host_HCCAInit (volatile HCCA *hcca)
-{
- USB_INT32U i;
-
-
- for (i = 0; i < 32; i++) {
-
- hcca->IntTable[i] = 0;
- hcca->FrameNumber = 0;
- hcca->DoneHead = 0;
- }
-
-}
-
-/*
-**************************************************************************************************************
-* WAIT FOR WDH INTERRUPT
-*
-* Description: This function is infinite loop which breaks when ever a WDH interrupt rises
-*
-* Arguments : None
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void Host_WDHWait (void)
-{
- while (!HOST_WdhIntr)
- __WFI();
-
- HOST_WdhIntr = 0;
-}
-
-/*
-**************************************************************************************************************
-* READ LE 32U
-*
-* Description: This function is used to read an unsigned integer from a character buffer in the platform
-* containing little endian processor
-*
-* Arguments : pmem Pointer to the character buffer
-*
-* Returns : val Unsigned integer
-*
-**************************************************************************************************************
-*/
-
-USB_INT32U ReadLE32U (volatile USB_INT08U *pmem)
-{
- USB_INT32U val = *(USB_INT32U*)pmem;
-#ifdef __BIG_ENDIAN
- return __REV(val);
-#else
- return val;
-#endif
-}
-
-/*
-**************************************************************************************************************
-* WRITE LE 32U
-*
-* Description: This function is used to write an unsigned integer into a charecter buffer in the platform
-* containing little endian processor.
-*
-* Arguments : pmem Pointer to the charecter buffer
-* val Integer value to be placed in the charecter buffer
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void WriteLE32U (volatile USB_INT08U *pmem,
- USB_INT32U val)
-{
-#ifdef __BIG_ENDIAN
- *(USB_INT32U*)pmem = __REV(val);
-#else
- *(USB_INT32U*)pmem = val;
-#endif
-}
-
-/*
-**************************************************************************************************************
-* READ LE 16U
-*
-* Description: This function is used to read an unsigned short integer from a charecter buffer in the platform
-* containing little endian processor
-*
-* Arguments : pmem Pointer to the charecter buffer
-*
-* Returns : val Unsigned short integer
-*
-**************************************************************************************************************
-*/
-
-USB_INT16U ReadLE16U (volatile USB_INT08U *pmem)
-{
- USB_INT16U val = *(USB_INT16U*)pmem;
-#ifdef __BIG_ENDIAN
- return __REV16(val);
-#else
- return val;
-#endif
-}
-
-/*
-**************************************************************************************************************
-* WRITE LE 16U
-*
-* Description: This function is used to write an unsigned short integer into a charecter buffer in the
-* platform containing little endian processor
-*
-* Arguments : pmem Pointer to the charecter buffer
-* val Value to be placed in the charecter buffer
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void WriteLE16U (volatile USB_INT08U *pmem,
- USB_INT16U val)
-{
-#ifdef __BIG_ENDIAN
- *(USB_INT16U*)pmem = (__REV16(val) & 0xFFFF);
-#else
- *(USB_INT16U*)pmem = val;
-#endif
-}
-
-/*
-**************************************************************************************************************
-* READ BE 32U
-*
-* Description: This function is used to read an unsigned integer from a charecter buffer in the platform
-* containing big endian processor
-*
-* Arguments : pmem Pointer to the charecter buffer
-*
-* Returns : val Unsigned integer
-*
-**************************************************************************************************************
-*/
-
-USB_INT32U ReadBE32U (volatile USB_INT08U *pmem)
-{
- USB_INT32U val = *(USB_INT32U*)pmem;
-#ifdef __BIG_ENDIAN
- return val;
-#else
- return __REV(val);
-#endif
-}
-
-/*
-**************************************************************************************************************
-* WRITE BE 32U
-*
-* Description: This function is used to write an unsigned integer into a charecter buffer in the platform
-* containing big endian processor
-*
-* Arguments : pmem Pointer to the charecter buffer
-* val Value to be placed in the charecter buffer
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void WriteBE32U (volatile USB_INT08U *pmem,
- USB_INT32U val)
-{
-#ifdef __BIG_ENDIAN
- *(USB_INT32U*)pmem = val;
-#else
- *(USB_INT32U*)pmem = __REV(val);
-#endif
-}
-
-/*
-**************************************************************************************************************
-* READ BE 16U
-*
-* Description: This function is used to read an unsigned short integer from a charecter buffer in the platform
-* containing big endian processor
-*
-* Arguments : pmem Pointer to the charecter buffer
-*
-* Returns : val Unsigned short integer
-*
-**************************************************************************************************************
-*/
-
-USB_INT16U ReadBE16U (volatile USB_INT08U *pmem)
-{
- USB_INT16U val = *(USB_INT16U*)pmem;
-#ifdef __BIG_ENDIAN
- return val;
-#else
- return __REV16(val);
-#endif
-}
-
-/*
-**************************************************************************************************************
-* WRITE BE 16U
-*
-* Description: This function is used to write an unsigned short integer into the charecter buffer in the
-* platform containing big endian processor
-*
-* Arguments : pmem Pointer to the charecter buffer
-* val Value to be placed in the charecter buffer
-*
-* Returns : None
-*
-**************************************************************************************************************
-*/
-
-void WriteBE16U (volatile USB_INT08U *pmem,
- USB_INT16U val)
-{
-#ifdef __BIG_ENDIAN
- *(USB_INT16U*)pmem = val;
-#else
- *(USB_INT16U*)pmem = (__REV16(val) & 0xFFFF);
-#endif
-}
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Repository details
| Type: | Program |
|---|---|
| Mbed OS support: | Mbed 2 deprecated |
| Created: | 26 Jan 2010 |
| Imports: | 2679 |
| Forks: | 7 |
| Commits: | 4 |
| Dependents: | 0 |
| Dependencies: | 2 |
| Followers: | 44 |
USB Mass Storage Device