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Writing data to and from a USB stick
USBHostLite/usbhost_lpc17xx.c
- Committer:
- ms523
- Date:
- 2011-11-06
- Revision:
- 0:5934350323b2
File content as of revision 0:5934350323b2:
/* ************************************************************************************************************** * 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 }