Jason Engelman
Port of Keils USBCDC example, compiles ok. Gets stuck at init
usbhw.c
- Committer:
- tecnosys
- Date:
- 2010-07-05
- Revision:
- 0:0b777ff85deb
File content as of revision 0:0b777ff85deb:
/*----------------------------------------------------------------------------
* U S B - K e r n e l
*----------------------------------------------------------------------------
* Name: usbhw.c
* Purpose: USB Hardware Layer Module for NXP's LPC17xx MCU
* Version: V1.20
*----------------------------------------------------------------------------
* This software is supplied "AS IS" without any warranties, express,
* implied or statutory, including but not limited to the implied
* warranties of fitness for purpose, satisfactory quality and
* noninfringement. Keil extends you a royalty-free right to reproduce
* and distribute executable files created using this software for use
* on NXP Semiconductors LPC family microcontroller devices only. Nothing
* else gives you the right to use this software.
*
* Copyright (c) 2009 Keil - An ARM Company. All rights reserved.
*----------------------------------------------------------------------------
* History:
* V1.20 Added USB_ClearEPBuf
* V1.00 Initial Version
*----------------------------------------------------------------------------*/
#include "LPC17xx.h" /* LPC17xx definitions */
//#include "LPC23xx.h"
#include "usb.h"
#include "usbcfg.h"
#include "usbreg.h"
#include "usbhw.h"
#include "usbcore.h"
#include "usbuser.h"
#pragma diag_suppress 1441
#define EP_MSK_CTRL 0x0001 /* Control Endpoint Logical Address Mask */
#define EP_MSK_BULK 0xC924 /* Bulk Endpoint Logical Address Mask */
#define EP_MSK_INT 0x4492 /* Interrupt Endpoint Logical Address Mask */
#define EP_MSK_ISO 0x1248 /* Isochronous Endpoint Logical Address Mask */
#if USB_DMA
#pragma arm section zidata = "USB_RAM"
uint32_t UDCA[USB_EP_NUM]; /* UDCA in USB RAM */
uint32_t DD_NISO_Mem[4*DD_NISO_CNT]; /* Non-Iso DMA Descriptor Memory */
uint32_t DD_ISO_Mem [5*DD_ISO_CNT]; /* Iso DMA Descriptor Memory */
#pragma arm section zidata
uint32_t udca[USB_EP_NUM]; /* UDCA saved values */
uint32_t DDMemMap[2]; /* DMA Descriptor Memory Usage */
#endif
/*
* Get Endpoint Physical Address
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: Endpoint Physical Address
*/
uint32_t EPAdr (uint32_t EPNum) {
uint32_t val;
val = (EPNum & 0x0F) << 1;
if (EPNum & 0x80) {
val += 1;
}
return (val);
}
/*
* Write Command
* Parameters: cmd: Command
* Return Value: None
*/
void WrCmd (uint32_t cmd) {
LPC_USB->USBDevIntClr = CCEMTY_INT;
LPC_USB->USBCmdCode = cmd;
while ((LPC_USB->USBDevIntSt & CCEMTY_INT) == 0);
}
/*
* Write Command Data
* Parameters: cmd: Command
* val: Data
* Return Value: None
*/
void WrCmdDat (uint32_t cmd, uint32_t val) {
LPC_USB->USBDevIntClr = CCEMTY_INT;
LPC_USB->USBCmdCode = cmd;
while ((LPC_USB->USBDevIntSt & CCEMTY_INT) == 0);
LPC_USB->USBDevIntClr = CCEMTY_INT;
LPC_USB->USBCmdCode = val;
while ((LPC_USB->USBDevIntSt & CCEMTY_INT) == 0);
}
/*
* Write Command to Endpoint
* Parameters: cmd: Command
* val: Data
* Return Value: None
*/
void WrCmdEP (uint32_t EPNum, uint32_t cmd){
LPC_USB->USBDevIntClr = CCEMTY_INT;
LPC_USB->USBCmdCode = CMD_SEL_EP(EPAdr(EPNum));
while ((LPC_USB->USBDevIntSt & CCEMTY_INT) == 0);
LPC_USB->USBDevIntClr = CCEMTY_INT;
LPC_USB->USBCmdCode = cmd;
while ((LPC_USB->USBDevIntSt & CCEMTY_INT) == 0);
}
/*
* Read Command Data
* Parameters: cmd: Command
* Return Value: Data Value
*/
uint32_t RdCmdDat (uint32_t cmd) {
LPC_USB->USBDevIntClr = CCEMTY_INT | CDFULL_INT;
LPC_USB->USBCmdCode = cmd;
while ((LPC_USB->USBDevIntSt & CDFULL_INT) == 0);
return (LPC_USB->USBCmdData);
}
/*
* USB Initialize Function
* Called by the User to initialize USB
* Return Value: None
*/
void USB_Init (void) {
LPC_PINCON->PINSEL1 &= ~((3<<26)|(3<<28)); /* P0.29 D+, P0.30 D- */
LPC_PINCON->PINSEL1 |= ((1<<26)|(1<<28)); /* PINSEL1 26.27, 28.29 = 01 */
LPC_PINCON->PINSEL3 &= ~((3<< 4)|(3<<28)); /* P1.18 GoodLink, P1.30 VBUS */
LPC_PINCON->PINSEL3 |= ((1<< 4)|(2<<28)); /* PINSEL3 4.5 = 01, 28.29 = 10 */
LPC_PINCON->PINSEL4 &= ~((3<<18) ); /* P2.9 SoftConnect */
LPC_PINCON->PINSEL4 |= ((1<<18) ); /* PINSEL4 18.19 = 01 */
LPC_SC->PCONP |= (1UL<<31); /* USB PCLK -> enable USB Per. */
LPC_USB->USBClkCtrl = 0x1A; /* Dev, PortSel, AHB clock enable */
while ((LPC_USB->USBClkSt & 0x1A) != 0x1A);
NVIC_EnableIRQ(USB_IRQn); /* enable USB interrupt */
USB_Reset();
USB_SetAddress(0);
}
/*
* USB Connect Function
* Called by the User to Connect/Disconnect USB
* Parameters: con: Connect/Disconnect
* Return Value: None
*/
void USB_Connect (uint32_t con) {
WrCmdDat(CMD_SET_DEV_STAT, DAT_WR_BYTE(con ? DEV_CON : 0));
}
/*
* USB Reset Function
* Called automatically on USB Reset
* Return Value: None
*/
void USB_Reset (void) {
#if USB_DMA
uint32_t n;
#endif
LPC_USB->USBEpInd = 0;
LPC_USB->USBMaxPSize = USB_MAX_PACKET0;
LPC_USB->USBEpInd = 1;
LPC_USB->USBMaxPSize = USB_MAX_PACKET0;
while ((LPC_USB->USBDevIntSt & EP_RLZED_INT) == 0);
LPC_USB->USBEpIntClr = 0xFFFFFFFF;
LPC_USB->USBEpIntEn = 0xFFFFFFFF ^ USB_DMA_EP;
LPC_USB->USBDevIntClr = 0xFFFFFFFF;
LPC_USB->USBDevIntEn = DEV_STAT_INT | EP_SLOW_INT |
(USB_SOF_EVENT ? FRAME_INT : 0) |
(USB_ERROR_EVENT ? ERR_INT : 0);
#if USB_DMA
LPC_USB->USBUDCAH = USB_RAM_ADR;
LPC_USB->USBDMARClr = 0xFFFFFFFF;
LPC_USB->USBEpDMADis = 0xFFFFFFFF;
LPC_USB->USBEpDMAEn = USB_DMA_EP;
LPC_USB->USBEoTIntClr = 0xFFFFFFFF;
LPC_USB->USBNDDRIntClr = 0xFFFFFFFF;
LPC_USB->USBSysErrIntClr = 0xFFFFFFFF;
LPC_USB->USBDMAIntEn = 0x00000007;
DDMemMap[0] = 0x00000000;
DDMemMap[1] = 0x00000000;
for (n = 0; n < USB_EP_NUM; n++) {
udca[n] = 0;
UDCA[n] = 0;
}
#endif
}
/*
* USB Suspend Function
* Called automatically on USB Suspend
* Return Value: None
*/
void USB_Suspend (void) {
/* Performed by Hardware */
}
/*
* USB Resume Function
* Called automatically on USB Resume
* Return Value: None
*/
void USB_Resume (void) {
/* Performed by Hardware */
}
/*
* USB Remote Wakeup Function
* Called automatically on USB Remote Wakeup
* Return Value: None
*/
void USB_WakeUp (void) {
if (USB_DeviceStatus & USB_GETSTATUS_REMOTE_WAKEUP) {
WrCmdDat(CMD_SET_DEV_STAT, DAT_WR_BYTE(DEV_CON));
}
}
/*
* USB Remote Wakeup Configuration Function
* Parameters: cfg: Enable/Disable
* Return Value: None
*/
void USB_WakeUpCfg (uint32_t cfg) {
/* Not needed */
}
/*
* USB Set Address Function
* Parameters: adr: USB Address
* Return Value: None
*/
void USB_SetAddress (uint32_t adr) {
WrCmdDat(CMD_SET_ADDR, DAT_WR_BYTE(DEV_EN | adr)); /* Don't wait for next */
WrCmdDat(CMD_SET_ADDR, DAT_WR_BYTE(DEV_EN | adr)); /* Setup Status Phase */
}
/*
* USB Configure Function
* Parameters: cfg: Configure/Deconfigure
* Return Value: None
*/
void USB_Configure (uint32_t cfg) {
WrCmdDat(CMD_CFG_DEV, DAT_WR_BYTE(cfg ? CONF_DVICE : 0));
LPC_USB->USBReEp = 0x00000003;
while ((LPC_USB->USBDevIntSt & EP_RLZED_INT) == 0);
LPC_USB->USBDevIntClr = EP_RLZED_INT;
}
/*
* Configure USB Endpoint according to Descriptor
* Parameters: pEPD: Pointer to Endpoint Descriptor
* Return Value: None
*/
void USB_ConfigEP (USB_ENDPOINT_DESCRIPTOR *pEPD) {
uint32_t num;
num = EPAdr(pEPD->bEndpointAddress);
LPC_USB->USBReEp |= (1 << num);
LPC_USB->USBEpInd = num;
LPC_USB->USBMaxPSize = pEPD->wMaxPacketSize;
while ((LPC_USB->USBDevIntSt & EP_RLZED_INT) == 0);
LPC_USB->USBDevIntClr = EP_RLZED_INT;
}
/*
* Set Direction for USB Control Endpoint
* Parameters: dir: Out (dir == 0), In (dir <> 0)
* Return Value: None
*/
void USB_DirCtrlEP (uint32_t dir) {
/* Not needed */
}
/*
* Enable USB Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_EnableEP (uint32_t EPNum) {
WrCmdDat(CMD_SET_EP_STAT(EPAdr(EPNum)), DAT_WR_BYTE(0));
}
/*
* Disable USB Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_DisableEP (uint32_t EPNum) {
WrCmdDat(CMD_SET_EP_STAT(EPAdr(EPNum)), DAT_WR_BYTE(EP_STAT_DA));
}
/*
* Reset USB Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_ResetEP (uint32_t EPNum) {
WrCmdDat(CMD_SET_EP_STAT(EPAdr(EPNum)), DAT_WR_BYTE(0));
}
/*
* Set Stall for USB Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_SetStallEP (uint32_t EPNum) {
WrCmdDat(CMD_SET_EP_STAT(EPAdr(EPNum)), DAT_WR_BYTE(EP_STAT_ST));
}
/*
* Clear Stall for USB Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_ClrStallEP (uint32_t EPNum) {
WrCmdDat(CMD_SET_EP_STAT(EPAdr(EPNum)), DAT_WR_BYTE(0));
}
/*
* Clear USB Endpoint Buffer
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_ClearEPBuf (uint32_t EPNum) {
WrCmdEP(EPNum, CMD_CLR_BUF);
}
/*
* Read USB Endpoint Data
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* pData: Pointer to Data Buffer
* Return Value: Number of bytes read
*/
uint32_t USB_ReadEP (uint32_t EPNum, uint8_t *pData) {
uint32_t cnt, n;
LPC_USB->USBCtrl = ((EPNum & 0x0F) << 2) | CTRL_RD_EN;
do {
cnt = LPC_USB->USBRxPLen;
} while ((cnt & PKT_RDY) == 0);
cnt &= PKT_LNGTH_MASK;
for (n = 0; n < (cnt + 3) / 4; n++) {
*((__packed uint32_t *)pData) = LPC_USB->USBRxData;
pData += 4;
}
LPC_USB->USBCtrl = 0;
if (((EP_MSK_ISO >> EPNum) & 1) == 0) { /* Non-Isochronous Endpoint */
WrCmdEP(EPNum, CMD_CLR_BUF);
}
return (cnt);
}
/*
* Write USB Endpoint Data
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* pData: Pointer to Data Buffer
* cnt: Number of bytes to write
* Return Value: Number of bytes written
*/
uint32_t USB_WriteEP (uint32_t EPNum, uint8_t *pData, uint32_t cnt) {
uint32_t n;
LPC_USB->USBCtrl = ((EPNum & 0x0F) << 2) | CTRL_WR_EN;
LPC_USB->USBTxPLen = cnt;
for (n = 0; n < (cnt + 3) / 4; n++) {
LPC_USB->USBTxData = *((__packed uint32_t *)pData);
pData += 4;
}
LPC_USB->USBCtrl = 0;
WrCmdEP(EPNum, CMD_VALID_BUF);
return (cnt);
}
#if USB_DMA
/* DMA Descriptor Memory Layout */
const uint32_t DDAdr[2] = { DD_NISO_ADR, DD_ISO_ADR };
const uint32_t DDSz [2] = { 16, 20 };
/*
* Setup USB DMA Transfer for selected Endpoint
* Parameters: EPNum: Endpoint Number
* pDD: Pointer to DMA Descriptor
* Return Value: TRUE - Success, FALSE - Error
*/
uint32_t USB_DMA_Setup(uint32_t EPNum, USB_DMA_DESCRIPTOR *pDD) {
uint32_t num, ptr, nxt, iso, n;
iso = pDD->Cfg.Type.IsoEP; /* Iso or Non-Iso Descriptor */
num = EPAdr(EPNum); /* Endpoint's Physical Address */
ptr = 0; /* Current Descriptor */
nxt = udca[num]; /* Initial Descriptor */
while (nxt) { /* Go through Descriptor List */
ptr = nxt; /* Current Descriptor */
if (!pDD->Cfg.Type.Link) { /* Check for Linked Descriptors */
n = (ptr - DDAdr[iso]) / DDSz[iso]; /* Descriptor Index */
DDMemMap[iso] &= ~(1 << n); /* Unmark Memory Usage */
}
nxt = *((uint32_t *)ptr); /* Next Descriptor */
}
for (n = 0; n < 32; n++) { /* Search for available Memory */
if ((DDMemMap[iso] & (1 << n)) == 0) {
break; /* Memory found */
}
}
if (n == 32) return (FALSE); /* Memory not available */
DDMemMap[iso] |= 1 << n; /* Mark Memory Usage */
nxt = DDAdr[iso] + n * DDSz[iso]; /* Next Descriptor */
if (ptr && pDD->Cfg.Type.Link) {
*((uint32_t *)(ptr + 0)) = nxt; /* Link in new Descriptor */
*((uint32_t *)(ptr + 4)) |= 0x00000004; /* Next DD is Valid */
} else {
udca[num] = nxt; /* Save new Descriptor */
UDCA[num] = nxt; /* Update UDCA in USB */
}
/* Fill in DMA Descriptor */
*(((uint32_t *)nxt)++) = 0; /* Next DD Pointer */
*(((uint32_t *)nxt)++) = pDD->Cfg.Type.ATLE |
(pDD->Cfg.Type.IsoEP << 4) |
(pDD->MaxSize << 5) |
(pDD->BufLen << 16);
*(((uint32_t *)nxt)++) = pDD->BufAdr;
*(((uint32_t *)nxt)++) = pDD->Cfg.Type.LenPos << 8;
if (iso) {
*((uint32_t *)nxt) = pDD->InfoAdr;
}
return (TRUE); /* Success */
}
/*
* Enable USB DMA Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_DMA_Enable (uint32_t EPNum) {
LPC_USB->USBEpDMAEn = 1 << EPAdr(EPNum);
}
/*
* Disable USB DMA Endpoint
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: None
*/
void USB_DMA_Disable (uint32_t EPNum) {
LPC_USB->USBEpDMADis = 1 << EPAdr(EPNum);
}
/*
* Get USB DMA Endpoint Status
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: DMA Status
*/
uint32_t USB_DMA_Status (uint32_t EPNum) {
uint32_t ptr, val;
ptr = UDCA[EPAdr(EPNum)]; /* Current Descriptor */
if (ptr == 0)
return (USB_DMA_INVALID);
val = *((uint32_t *)(ptr + 3*4)); /* Status Information */
switch ((val >> 1) & 0x0F) {
case 0x00: /* Not serviced */
return (USB_DMA_IDLE);
case 0x01: /* Being serviced */
return (USB_DMA_BUSY);
case 0x02: /* Normal Completition */
return (USB_DMA_DONE);
case 0x03: /* Data Under Run */
return (USB_DMA_UNDER_RUN);
case 0x08: /* Data Over Run */
return (USB_DMA_OVER_RUN);
case 0x09: /* System Error */
return (USB_DMA_ERROR);
}
return (USB_DMA_UNKNOWN);
}
/*
* Get USB DMA Endpoint Current Buffer Address
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: DMA Address (or -1 when DMA is Invalid)
*/
uint32_t USB_DMA_BufAdr (uint32_t EPNum) {
uint32_t ptr, val;
ptr = UDCA[EPAdr(EPNum)]; /* Current Descriptor */
if (ptr == 0)
{
return ((uint32_t)(-1)); /* DMA Invalid */
}
val = *((uint32_t *)(ptr + 2*4)); /* Buffer Address */
return (val); /* Current Address */
}
/*
* Get USB DMA Endpoint Current Buffer Count
* Number of transfered Bytes or Iso Packets
* Parameters: EPNum: Endpoint Number
* EPNum.0..3: Address
* EPNum.7: Dir
* Return Value: DMA Count (or -1 when DMA is Invalid)
*/
uint32_t USB_DMA_BufCnt (uint32_t EPNum) {
uint32_t ptr, val;
ptr = UDCA[EPAdr(EPNum)]; /* Current Descriptor */
if (ptr == 0)
{
return ((uint32_t)(-1)); /* DMA Invalid */
}
val = *((uint32_t *)(ptr + 3*4)); /* Status Information */
return (val >> 16); /* Current Count */
}
#endif /* USB_DMA */
/*
* Get USB Last Frame Number
* Parameters: None
* Return Value: Frame Number
*/
uint32_t USB_GetFrame (void) {
uint32_t val;
WrCmd(CMD_RD_FRAME);
val = RdCmdDat(DAT_RD_FRAME);
val = val | (RdCmdDat(DAT_RD_FRAME) << 8);
return (val);
}
/*
* USB Interrupt Service Routine
*/
void USB_IRQHandler (void) {
uint32_t disr, val, n, m;
uint32_t episr, episrCur;
disr = LPC_USB->USBDevIntSt; /* Device Interrupt Status */
/* Device Status Interrupt (Reset, Connect change, Suspend/Resume) */
if (disr & DEV_STAT_INT) {
LPC_USB->USBDevIntClr = DEV_STAT_INT;
WrCmd(CMD_GET_DEV_STAT);
val = RdCmdDat(DAT_GET_DEV_STAT); /* Device Status */
if (val & DEV_RST) { /* Reset */
USB_Reset();
#if USB_RESET_EVENT
USB_Reset_Event();
#endif
}
if (val & DEV_CON_CH) { /* Connect change */
#if USB_POWER_EVENT
USB_Power_Event(val & DEV_CON);
#endif
}
if (val & DEV_SUS_CH) { /* Suspend/Resume */
if (val & DEV_SUS) { /* Suspend */
USB_Suspend();
#if USB_SUSPEND_EVENT
USB_Suspend_Event();
#endif
} else { /* Resume */
USB_Resume();
#if USB_RESUME_EVENT
USB_Resume_Event();
#endif
}
}
goto isr_end;
}
#if USB_SOF_EVENT
/* Start of Frame Interrupt */
if (disr & FRAME_INT) {
USB_SOF_Event();
}
#endif
#if USB_ERROR_EVENT
/* Error Interrupt */
if (disr & ERR_INT) {
WrCmd(CMD_RD_ERR_STAT);
val = RdCmdDat(DAT_RD_ERR_STAT);
USB_Error_Event(val);
}
#endif
/* Endpoint's Slow Interrupt */
if (disr & EP_SLOW_INT) {
episrCur = 0;
episr = LPC_USB->USBEpIntSt;
for (n = 0; n < USB_EP_NUM; n++) { /* Check All Endpoints */
if (episr == episrCur) break; /* break if all EP interrupts handled */
if (episr & (1 << n)) {
episrCur |= (1 << n);
m = n >> 1;
LPC_USB->USBEpIntClr = (1 << n);
while ((LPC_USB->USBDevIntSt & CDFULL_INT) == 0);
val = LPC_USB->USBCmdData;
if ((n & 1) == 0) { /* OUT Endpoint */
if (n == 0) { /* Control OUT Endpoint */
if (val & EP_SEL_STP) { /* Setup Packet */
if (USB_P_EP[0]) {
USB_P_EP[0](USB_EVT_SETUP);
continue;
}
}
}
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_OUT);
}
} else { /* IN Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_IN);
}
}
}
}
LPC_USB->USBDevIntClr = EP_SLOW_INT;
}
#if USB_DMA
if (LPC_USB->USBDMAIntSt & 0x00000001) { /* End of Transfer Interrupt */
val = LPC_USB->USBEoTIntSt;
for (n = 2; n < USB_EP_NUM; n++) { /* Check All Endpoints */
if (val & (1 << n)) {
m = n >> 1;
if ((n & 1) == 0) { /* OUT Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_OUT_DMA_EOT);
}
} else { /* IN Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_IN_DMA_EOT);
}
}
}
}
LPC_USB->USBEoTIntClr = val;
}
if (LPC_USB->USBDMAIntSt & 0x00000002) { /* New DD Request Interrupt */
val = LPC_USB->USBNDDRIntSt;
for (n = 2; n < USB_EP_NUM; n++) { /* Check All Endpoints */
if (val & (1 << n)) {
m = n >> 1;
if ((n & 1) == 0) { /* OUT Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_OUT_DMA_NDR);
}
} else { /* IN Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_IN_DMA_NDR);
}
}
}
}
LPC_USB->USBNDDRIntClr = val;
}
if (LPC_USB->USBDMAIntSt & 0x00000004) { /* System Error Interrupt */
val = LPC_USB->USBSysErrIntSt;
for (n = 2; n < USB_EP_NUM; n++) { /* Check All Endpoints */
if (val & (1 << n)) {
m = n >> 1;
if ((n & 1) == 0) { /* OUT Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_OUT_DMA_ERR);
}
} else { /* IN Endpoint */
if (USB_P_EP[m]) {
USB_P_EP[m](USB_EVT_IN_DMA_ERR);
}
}
}
}
LPC_USB->USBSysErrIntClr = val;
}
#endif /* USB_DMA */
isr_end:
return;
}