📄 usbhost_lpc17xx.c
字号:
/*
**************************************************************************************************************
* 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 uint32_t HOST_RhscIntr = 0; /* Root Hub Status Change interrupt */
volatile uint32_t HOST_WdhIntr = 0; /* Semaphore to wait until the TD is submitted */
volatile uint8_t 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 */
uint16_t *TDBufNonVol; /* Identical to TDBuffer just to reduce compiler warnings */
volatile uint8_t *TDBuffer; /* Current Buffer Pointer of transfer descriptor */
volatile uint8_t *FATBuffer; /* Buffer used by FAT file system */
volatile uint8_t *UserBuffer; /* Buffer used by application */
volatile uint32_t UnrecoverableIntCount = 0;
/*
**************************************************************************************************************
* DELAY IN MILLI SECONDS
*
* Description: This function provides a delay in milli seconds
*
* Arguments : delay The delay required
*
* Returns : None
*
**************************************************************************************************************
*/
void Host_DelayMS (uint32_t delay)
{
volatile uint32_t 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 (uint32_t delay)
{
volatile uint32_t i;
for (i = 0; i < (4 * delay); i++) { /* This logic was tested. It gives app. 1 micro sec delay */
;
}
}
/*
**************************************************************************************************************
* INITIALIZE THE HOST CONTROLLER
*
* Description: This function initializes lpc17xx host controller
*
* Arguments : None
*
* Returns :
*
**************************************************************************************************************
*/
void Host_Init (void)
{
uint32_t HostBaseAddr;
LPC_SC->PCONP |= 0x80000000;
LPC_USB->USBClkCtrl = 0x0000001F; /* Enable USB host clock */
while ((LPC_USB->USBClkSt & 0x0000001F) != 0x1F);
LPC_USB->StCtrl = 0x3;
/* 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
/* 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");
/* Set up host base address and TD and ED descriptors */
HostBaseAddr = HOST_BASE_ADDR;
Hcca = (volatile HCCA *)(HostBaseAddr+0x000);
TDHead = (volatile HCTD *)(HostBaseAddr+0x100);
TDTail = (volatile HCTD *)(HostBaseAddr+0x110);
EDCtrl = (volatile HCED *)(HostBaseAddr+0x120);
EDBulkIn = (volatile HCED *)(HostBaseAddr+0x130);
EDBulkOut = (volatile HCED *)(HostBaseAddr+0x140);
TDBuffer = (volatile uint8_t *)(HostBaseAddr+0x150);
FATBuffer = (volatile uint8_t *)(HostBaseAddr+0x1D0);
UserBuffer = (volatile uint8_t *)(HostBaseAddr+0x1000);
/* 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->Control = 0; /* HARDWARE RESET */
LPC_USB->ControlHeadED = 0; /* Initialize Control list head to Zero */
LPC_USB->BulkHeadED = 0; /* Initialize Bulk list head to Zero */
/* SOFTWARE RESET */
LPC_USB->CommandStatus = OR_CMD_STATUS_HCR;
LPC_USB->FmInterval = DEFAULT_FMINTERVAL; /* Write Fm Interval and Largest Data Packet Counter */
/* Put HC in operational state */
LPC_USB->Control = (LPC_USB->Control & (~OR_CONTROL_HCFS)) | OR_CONTROL_HC_OPER;
LPC_USB->RhStatus = OR_RH_STATUS_LPSC; /* Set Global Power */
LPC_USB->HCCA = (uint32_t)Hcca;
LPC_USB->InterruptStatus |= LPC_USB->InterruptStatus; /* Clear Interrrupt Status */
LPC_USB->InterruptEnable = OR_INTR_ENABLE_MIE |
OR_INTR_ENABLE_WDH |
OR_INTR_ENABLE_RHSC |
OR_INTR_ENABLE_UE;
/* Enable the USB Interrupt */
NVIC_EnableIRQ(USB_IRQn); /* enable USB interrupt */
NVIC_SetPriority (USB_IRQn, 0); /* highest priority */
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)
{
uint32_t int_status;
uint32_t ie_status;
int_status = LPC_USB->InterruptStatus; /* Read Interrupt Status */
ie_status = LPC_USB->InterruptEnable; /* 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->RhPortStatus1 & OR_RH_PORT_CSC) {
if (LPC_USB->RhStatus & OR_RH_STATUS_DRWE) {
/*
* When DRWE is on, Connect Status Change
* means a remote wakeup event.
*/
HOST_RhscIntr |= 0x01;// JUST SOMETHING FOR A BREAKPOINT
}
else {
/*
* When DRWE is off, Connect Status Change
* is NOT a remote wakeup event
*/
if (LPC_USB->RhPortStatus1 & OR_RH_PORT_CCS) {
if (!gUSBConnected) {
HOST_TDControlStatus = 0;
HOST_WdhIntr = 0;
HOST_RhscIntr |= 0x01;
gUSBConnected = 1;
}
else
PRINT_Log("Spurious status change (connected)?\n");
} else {
if (gUSBConnected) {
LPC_USB->InterruptEnable = 0; // why do we get multiple disc. rupts???
HOST_RhscIntr &= ~0x01;
gUSBConnected = 0;
}
else
PRINT_Log("Spurious status change (disconnected)?\n");
}
}
LPC_USB->RhPortStatus1 = OR_RH_PORT_CSC;
}
if (LPC_USB->RhPortStatus2 & OR_RH_PORT_CSC) {
if (LPC_USB->RhStatus & OR_RH_STATUS_DRWE) {
/*
* When DRWE is on, Connect Status Change
* means a remote wakeup event.
*/
HOST_RhscIntr |= 0x02;// JUST SOMETHING FOR A BREAKPOINT
}
else {
/*
* When DRWE is off, Connect Status Change
* is NOT a remote wakeup event
*/
if (LPC_USB->RhPortStatus2 & OR_RH_PORT_CCS) {
if (!gUSBConnected) {
HOST_TDControlStatus = 0;
HOST_WdhIntr = 0;
HOST_RhscIntr |= 0x02;
gUSBConnected = 1;
}
else
PRINT_Log("Spurious status change (connected)?\n");
} else {
if (gUSBConnected) {
LPC_USB->InterruptEnable = 0; // why do we get multiple disc. rupts???
HOST_RhscIntr &= ~0x02;
gUSBConnected = 0;
}
else
PRINT_Log("Spurious status change (disconnected)?\n");
}
}
LPC_USB->RhPortStatus2 = OR_RH_PORT_CSC;
}
if (LPC_USB->RhPortStatus1 & OR_RH_PORT_PRSC) {
LPC_USB->RhPortStatus1 = OR_RH_PORT_PRSC;
}
if (LPC_USB->RhPortStatus2 & OR_RH_PORT_PRSC) {
LPC_USB->RhPortStatus2 = OR_RH_PORT_PRSC;
}
}
if (int_status & OR_INTR_STATUS_WDH) { /* Writeback Done Head interrupt */
HOST_WdhIntr = 1;
HOST_TDControlStatus = (TDHead->Control >> 28) & 0xf;
}
if (int_status & OR_INTR_STATUS_UE) { /* Unrecoverable Error interrupt */
UnrecoverableIntCount++;
}
LPC_USB->InterruptStatus = 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
*
**************************************************************************************************************
*/
int32_t Host_ProcessTD (volatile HCED *ed,
volatile uint32_t token,
volatile uint8_t *buffer,
uint32_t buffer_len)
{
volatile uint32_t 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 = (uint32_t) buffer;
TDTail->CurrBufPtr = 0;
TDHead->Next = (uint32_t) TDTail;
TDTail->Next = 0;
TDHead->BufEnd = (uint32_t)(buffer + (buffer_len - 1));
TDTail->BufEnd = 0;
ed->HeadTd = (uint32_t)TDHead | ((ed->HeadTd) & 0x00000002);
ed->TailTd = (uint32_t)TDTail;
ed->Next = 0;
if (ed == EDCtrl) {
LPC_USB->ControlHeadED = (uint32_t)ed;
LPC_USB->CommandStatus |= OR_CMD_STATUS_CLF;
LPC_USB->Control |= OR_CONTROL_CLE;
} else {
LPC_USB->BulkHeadED = (uint32_t)ed;
LPC_USB->CommandStatus |= OR_CMD_STATUS_BLF;
LPC_USB->Control |= 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
*
**************************************************************************************************************
*/
int32_t Host_EnumDev (void)
{
int32_t rc;
PRINT_Log("Connect a Mass Storage device\n");
while (!HOST_RhscIntr);
Host_DelayMS(100); /* USB 2.0 spec says atleast 50ms delay beore port reset */
if ( HOST_RhscIntr & 0x01 )
{
LPC_USB->RhPortStatus1 = OR_RH_PORT_PRS; // Initiate port reset
while (LPC_USB->RhPortStatus1 & OR_RH_PORT_PRS)
; // Wait for port reset to complete...
LPC_USB->RhPortStatus1 = OR_RH_PORT_PRSC; // ...and clear port reset signal
}
if ( HOST_RhscIntr & 0x02 )
{
LPC_USB->RhPortStatus2 = OR_RH_PORT_PRS; // Initiate port reset
while (LPC_USB->RhPortStatus2 & OR_RH_PORT_PRS)
; // Wait for port reset to complete...
LPC_USB->RhPortStatus2 = 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 */
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -