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usbtmc.cpp
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/*
* USBTMC class driver for USB Host Shield 2.0 Library
* Copyright (c) 2022 Naoya Imai
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "usbtmc.h"
#define USBTMC_MESSAGE_SIZE 64
#define USBTMC_RCV_HEADER_SIZE 12
const uint8_t USBTMC::epDataInIndex = 1;
const uint8_t USBTMC::epDataOutIndex = 2;
const uint8_t USBTMC::epInterruptInIndex = 3;
USBTMC::USBTMC(USB* p, USBTMCAsyncOper * pasync, uint16_t vid, uint16_t pid) :
pAsync(pasync), pUsb(p), targetVID(vid), targetPID(pid), serialNumberDataPtr(NULL), bAddress(0), bNumEP(1), bTag(1), rtb_bTag(2), commandState(USBTMCState::Idle), bin_current_size(0), previousMillis(0), timestepMillis(0), isConnected(false)
{
fifo_flush();
for (uint8_t i = 0; i < USBTMC_MAX_ENDPOINTS; i++)
{
epInfo[i].epAddr = 0;
epInfo[i].maxPktSize = (i) ? 0 : 8;
epInfo[i].bmSndToggle = 0;
epInfo[i].bmRcvToggle = 0;
epInfo[i].bmNakPower = (i == epDataInIndex) ? USB_NAK_NOWAIT : USB_NAK_MAX_POWER;
}
if (pUsb)
pUsb->RegisterDeviceClass(this);
}
uint8_t USBTMC::Init(uint8_t parent, uint8_t port, bool lowspeed)
{
const uint8_t constBufSize = sizeof(USB_DEVICE_DESCRIPTOR);
uint8_t buf[constBufSize];
USB_DEVICE_DESCRIPTOR* udd = reinterpret_cast<USB_DEVICE_DESCRIPTOR*>(buf);
uint8_t rcode;
UsbDevice* p = NULL;
EpInfo* oldep_ptr = NULL;
uint8_t num_of_conf; // number of configurations
AddressPool & addrPool = pUsb->GetAddressPool();
if (bAddress)
return USB_ERROR_CLASS_INSTANCE_ALREADY_IN_USE;
// Get pointer to pseudo device with address 0 assigned
p = addrPool.GetUsbDevicePtr(0);
if (!p)
return USB_ERROR_ADDRESS_NOT_FOUND_IN_POOL;
if (!p->epinfo)
return USB_ERROR_EPINFO_IS_NULL;
// Save old pointer to EP_RECORD of address 0
oldep_ptr = p->epinfo;
// Temporary assign new pointer to epInfo to p->epinfo in order to avoid toggle inconsistence
p->epinfo = epInfo;
p->lowspeed = lowspeed;
// Get device descriptor
rcode = pUsb->getDevDescr(0, 0, sizeof(USB_DEVICE_DESCRIPTOR), buf);
// Restore p->epinfo
p->epinfo = oldep_ptr;
if (rcode)
goto FailGetDevDescr;
if (targetVID != 0 || targetPID != 0)
{
if (udd->idVendor != targetVID || udd->idProduct != targetPID)
{
rcode = USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;
goto FailOnInit;
}
}
uint8_t serialNumData[255];
uint8_t serialNumLength;
GetStringDescriptor(0, udd->iSerialNumber, serialNumData, &serialNumLength);
if (serialNumberDataPtr != NULL)
{
bool isValid = true;
for (int i=0; i < serialNumLength; i++)
{
if (serialNumData[i] != pgm_read_byte(serialNumberDataPtr + i))
{
isValid = false;
break;
}
}
if (!isValid)
{
rcode = USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;
goto FailOnInit;
}
}
pAsync->OnRcvdDescr(udd, serialNumData, serialNumLength);
// Allocate new address according to device class
bAddress = addrPool.AllocAddress(parent, false, port);
if (!bAddress)
return USB_ERROR_OUT_OF_ADDRESS_SPACE_IN_POOL;
// Extract Max Packet Size from the device descriptor
epInfo[0].maxPktSize = udd->bMaxPacketSize0;
// Assign new address to the device
rcode = pUsb->setAddr(0, 0, bAddress);
if (rcode)
{
p->lowspeed = false;
addrPool.FreeAddress(bAddress);
bAddress = 0;
return rcode;
}
p->lowspeed = false;
p = addrPool.GetUsbDevicePtr(bAddress);
if (!p)
return USB_ERROR_ADDRESS_NOT_FOUND_IN_POOL;
p->lowspeed = lowspeed;
num_of_conf = udd->bNumConfigurations;
// Assign epInfo to epinfo pointer
rcode = pUsb->setEpInfoEntry(bAddress, 1, epInfo);
if (rcode)
goto FailSetDevTblEntry;
for (uint8_t i = 0; i < num_of_conf; i++)
{
//USB Test and Measurement Device conforming to the USBTMC USB488 Subclass Specification found on www.usb.org.
ConfigDescParser < USB_CLASS_APP_SPECIFIC, 0x03, 0x01, CP_MASK_COMPARE_ALL > confDescrParser(this);
rcode = pUsb->getConfDescr(bAddress, 0, i, &confDescrParser);
if (rcode)
goto FailGetConfDescr;
if (bNumEP > 1)
break;
} // for
if (bNumEP < 2)
return USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;
// Assign epInfo to epinfo pointer
rcode = pUsb->setEpInfoEntry(bAddress, bNumEP, epInfo);
// Set Configuration Value
rcode = pUsb->setConf(bAddress, 0, bConfNum);
if (rcode)
goto FailSetConfDescr;
rcode = GetCapabilities(&Capabilities);
if (rcode)
goto FailOnInit;
// Does the interface accept REN_CONTROL request?
if(Capabilities.USB488Interface & 0x02)
{
// USB488 REN_CONTROL
// bRequest = 0xA0(160) REN_CONTROL
// wValLo = 0x01 Assert REN.
// wValHi = 0x00 Reserved. Must be 0x00.
// total, nbytes = 0x0001
uint8_t usbtmc_status;
rcode = pUsb->ctrlReq(bAddress, 0, bmREQ_CL_GET_INTF, 0xA0, 0x01, 0x00, 0x0000, 0x0001, 0x0001, &usbtmc_status, NULL);
if (rcode)
goto FailOnInit;
if (usbtmc_status != 0x01)
goto FailOnInit;
}
isConnected = true;
return 0;
FailGetDevDescr:
# ifdef DEBUG_USB_HOST
NotifyFailGetDevDescr();
goto Fail;
#endif
FailSetDevTblEntry:
# ifdef DEBUG_USB_HOST
NotifyFailSetDevTblEntry();
goto Fail;
#endif
FailGetConfDescr:
# ifdef DEBUG_USB_HOST
NotifyFailGetConfDescr();
goto Fail;
#endif
FailSetConfDescr:
# ifdef DEBUG_USB_HOST
NotifyFailSetConfDescr();
goto Fail;
#endif
FailOnInit:
#ifdef DEBUG_USB_HOST
Fail:
NotifyFail(rcode);
#endif
Release();
return rcode;
}
uint8_t USBTMC::GetStringDescriptor(uint8_t addr, uint8_t idx, uint8_t* dataptr, uint8_t* datalen)
{
uint8_t rcode;
uint8_t length;
uint16_t langid;
// get language table length
rcode = pUsb->getStrDescr(addr, 0, 1, 0, 0, dataptr);
if (rcode)
{
return rcode;
}
length = dataptr[ 0 ]; //length is the first byte
// get language table
rcode = pUsb->getStrDescr(addr, 0, length, 0, 0, dataptr);
if (rcode)
{
return rcode;
}
langid = (dataptr[3] << 8) | dataptr[2];
rcode = pUsb->getStrDescr(addr, 0, 1, idx, langid, dataptr);
if (rcode)
{
return rcode;
}
*datalen = dataptr[ 0 ];
rcode = pUsb->getStrDescr(addr, 0, *datalen, idx, langid, dataptr);
if (rcode)
{
return rcode;
}
return rcode;
}
bool USBTMC::IsConnected()
{
return isConnected;
}
void USBTMC::Clear()
{
commandState = USBTMCState::InitiateClear;
}
void USBTMC::SetTargetSerialNumber(const uint8_t* serialNumPtr)
{
serialNumberDataPtr = serialNumPtr;
}
void USBTMC::Request(int length)
{
uint8_t rcode = 0;
if (!IsIdle())
{
pAsync->OnFailed(USBTMCInformation::RequestError, USBTMC_ERR_BUSY);
return;
}
rcode = BulkOutRequest((uint32_t)length);
if (rcode)
{
requestLength = 0;
pAsync->OnFailed(USBTMCInformation::RequestError, rcode);
return;
}
waitBeginMillis = millis();
requestLength = (uint32_t)length;
commandState = USBTMCState::ReceiveHeader;
}
void USBTMC::ReadStatusByte()
{
uint8_t rcode = 0;
// USB488 READ_STATUS_BYTE
// bRequest = 0x80(128) READ_STATUS_BYTE
// wValLo = bTag.
// wValHi = 0x00 Reserved. Must be 0x00.
// total, nbytes = 0x0003
uint8_t response[3];
uint16_t wInd = 0x0000;
rcode = pUsb->ctrlReq(bAddress, 0, bmREQ_CL_GET_INTF, 0x80, rtb_bTag, 0x0000, wInd, 0x0003, 0x0003, response, NULL);
last_rtb_bTag = rtb_bTag;
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::ReadstatusbyteError, rcode);
return;
}
if (response[0] != 0x01)
{
pAsync->OnFailed(USBTMCInformation::ReadstatusbyteError, USBTMC_ERR_FAILED);
return;
}
rtb_bTag++;
if (rtb_bTag > 127)
rtb_bTag = 2;
if(Capabilities.USB488Interface & 0x02)
{
uint8_t status;
rcode = ReadStatusByteFromInterruptEP(status, last_rtb_bTag);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::ReadstatusbyteError, rcode);
}
else
{
pAsync->OnReadStatusByte(status);
}
}
else
{
pAsync->OnReadStatusByte(response[2]);
}
}
void USBTMC::Transmit(uint8_t nbytes, uint8_t* dataptr)
{
if(!IsIdle())
{
pAsync->OnFailed(USBTMCInformation::TransmitError, USBTMC_ERR_BUSY);
return;
}
BeginTransmit(nbytes);
for(int i=0; i<nbytes; i++)
{
TransmitData(*dataptr++);
if(TransmitDone())
break;
}
}
void USBTMC::BeginTransmit(uint32_t total_size)
{
bin_total_size = total_size;
bin_current_size = bin_total_size;
isSentHeader = false;
}
void USBTMC::TransmitData(uint8_t data)
{
#define BUFFER_LENGTH 64
uint8_t rcode = 0;
if(fifo_available() >= (USBTMC_FIFO_SIZE-1))
{
fifo_flush();
bin_current_size = 0;
if(isSentHeader)
commandState = USBTMCState::InitiateAbortBulkOut;
isSentHeader = false;
pAsync->OnFailed(USBTMCInformation::TransmitError, USBTMC_ERR_OVERFLOWED);
return;
}
fifo_write(data);
if(bin_current_size > 0)
bin_current_size--;
uint32_t max_packet_size;
uint32_t remain;
uint8_t buf[BUFFER_LENGTH];
if(isSentHeader)
max_packet_size = epInfo[epDataOutIndex].maxPktSize;
else
max_packet_size = epInfo[epDataOutIndex].maxPktSize - USBTMC_RCV_HEADER_SIZE;
remain = (uint32_t)fifo_available();
if(remain < max_packet_size)
if(bin_current_size <= 0)
max_packet_size = remain;
else
return;
for(int i = 0; i < max_packet_size; i++)
buf[i] = fifo_read();
if(isSentHeader)
{
rcode = BulkOutData(max_packet_size, buf);
}
else
{
rcode = BulkOutData(max_packet_size, &buf[0], bin_total_size);
if (!rcode)
isSentHeader = true;
}
if (rcode)
{
fifo_flush();
bin_current_size = 0;
commandState = USBTMCState::InitiateAbortBulkOut;
isSentHeader = false;
if(isSentHeader)
commandState = USBTMCState::InitiateAbortBulkOut;
return;
}
if(bin_current_size <= 0)
{
fifo_flush();
isSentHeader = false;
}
#undef BUFFER_LENGTH
}
bool USBTMC::TransmitDone()
{
if(bin_current_size <= 0)
return true;
else
return false;
}
void USBTMC::AbortReceive()
{
commandState = USBTMCState::InitiateAbortBulkIn;
}
void USBTMC::AbortTransmit()
{
commandState = USBTMCState::InitiateAbortBulkOut;
}
void USBTMC::Run()
{
#define BUFFER_LENGTH 64
uint8_t rcode = 0;
uint8_t status = 0;;
uint8_t bmAbortBulkIn = 0;
bool isFull = false;
uint16_t rcvd = BUFFER_LENGTH;
uint8_t buf[BUFFER_LENGTH];
uint32_t currentMillis;
USBTMCState state;
if (pUsb->getUsbTaskState() != USB_STATE_RUNNING) {
commandState = USBTMCState::Idle;
return;
}
currentMillis = millis();
if ((currentMillis - previousMillis) < timestepMillis)
return;
previousMillis = currentMillis;
switch (commandState)
{
case USBTMCState::Pause:
if(isResume == false)
commandState = resumedCommandState;
break;
case USBTMCState::ReceiveHeader:
uint32_t totalLength;
totalLength = requestLength;
rcode = BulkIn(&rcvd, buf, totalLength);
if (rcode == hrNAK)
{
//Try again
currentMillis = millis();
if ((currentMillis - waitBeginMillis) >= 5000)
{
pAsync->OnFailed(USBTMCInformation::ReceiveheaderNakAndTimeouted, 0);
commandState = USBTMCState::InitiateAbortBulkIn;
}
}
else if (rcode)
{
pAsync->OnFailed(USBTMCInformation::ReceiveheaderError, rcode);
commandState = USBTMCState::Idle;
}
else
{
waitBeginMillis = millis();
if(requestLength > totalLength)
requestLength = totalLength;
if(rcvd > requestLength)
rcvd = requestLength;
for (uint16_t i = USBTMC_RCV_HEADER_SIZE; i < (rcvd + USBTMC_RCV_HEADER_SIZE); i++)
pAsync->OnReceived(buf[i]);
requestLength -= rcvd;
if(requestLength > 0)
commandState = USBTMCState::ReceivePayload;
else
commandState = USBTMCState::Idle;
}
break;
case USBTMCState::ReceivePayload:
rcode = BulkIn(&rcvd, buf);
if (rcode == hrNAK)
{
//Try again
currentMillis = millis();
if ((currentMillis - waitBeginMillis) >= 5000)
{
pAsync->OnFailed(USBTMCInformation::ReceivepayloadNakAndTimeouted, 0);
commandState = USBTMCState::InitiateAbortBulkIn;
}
}
else if (rcode)
{
pAsync->OnFailed(USBTMCInformation::ReceivepayloadError, rcode);
commandState = USBTMCState::Idle;
}
else
{
waitBeginMillis = millis();
if(rcvd > requestLength)
rcvd = requestLength;
for (uint16_t i = 0; i < rcvd; i++)
pAsync->OnReceived(buf[i]);
requestLength -= rcvd;
if(requestLength > 0)
commandState = USBTMCState::ReceivePayload;
else
commandState = USBTMCState::Idle;
}
break;
case USBTMCState::InitiateAbortBulkOut:
rcode = InitiateAbortBulkOut(status);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::InitiateabortbulkoutError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(status == 0x01) // STATUS_SUCCESS
commandState = USBTMCState::CheckAbortBulkOutStatus;
else
{
pAsync->OnFailed(USBTMCInformation::InitiateabortbulkoutFailed, status);
commandState = USBTMCState::Idle;
}
}
break;
case USBTMCState::CheckAbortBulkOutStatus:
rcode = CheckAbortBulkOutStatus(status);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::CheckabortbulkoutstatusError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(status != 0x02) // Not STATUS_PENDING
commandState = USBTMCState::ClearFeature;
}
break;
case USBTMCState::InitiateAbortBulkIn:
rcode = InitiateAbortBulkIn(status);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::InitiateabortbulkinError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(status == 0x01) // STATUS_SUCCESS
commandState = USBTMCState::ReadingByAbortBulkIn;
else
{
pAsync->OnFailed(USBTMCInformation::InitiateabortbulkinFailed, status);
commandState = USBTMCState::Idle;
}
}
break;
case USBTMCState::ReadingByAbortBulkIn:
rcode = PurgeBulkIn(isFull);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::ReadingbyabortbulkinError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(isFull)
commandState = USBTMCState::ReadingByAbortBulkIn;
else
commandState = USBTMCState::CheckAbortBulkInStatus;
}
break;
case USBTMCState::CheckAbortBulkInStatus:
rcode = CheckAbortBulkInStatus(status, bmAbortBulkIn);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::CheckabortbulkinstatusError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(status != 0x02) // Not STATUS_PENDING
{
pAsync->OnFailed(USBTMCInformation::AbortbulkinSucceed, 0);
commandState = USBTMCState::Idle;
}
else
{
if(bmAbortBulkIn & 0x01 == 0x01)
commandState = USBTMCState::ReadingByAbortBulkIn;
else
commandState = USBTMCState::CheckAbortBulkInStatus;
}
}
break;
case USBTMCState::InitiateClear:
rcode = InitiateClear(status);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::InitiateclearError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(status == 0x01) // STATUS_SUCCESS
commandState = USBTMCState::CheckClearStatus;
else
{
pAsync->OnFailed(USBTMCInformation::InitiateclearFailed, status);
commandState = USBTMCState::Idle;
}
}
break;
case USBTMCState::CheckClearStatus:
rcode = CheckClearStatus(status, bmAbortBulkIn);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::CheckclearstatusError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(status != 0x02) // Not STATUS_PENDING
commandState = USBTMCState::ClearFeature;
else
{
if(bmAbortBulkIn & 0x01 == 0x01)
commandState = USBTMCState::ReadingByInitiateClear;
else
commandState = USBTMCState::CheckClearStatus;
}
}
break;
case USBTMCState::ReadingByInitiateClear:
rcode = PurgeBulkIn(isFull);
if (rcode)
{
pAsync->OnFailed(USBTMCInformation::ReadingbyinitiateclearError, rcode);
commandState = USBTMCState::Idle;
}
else
{
if(isFull)
commandState = USBTMCState::ReadingByInitiateClear;
else
commandState = USBTMCState::CheckClearStatus;
}
break;
case USBTMCState::ClearFeature:
// The Host must send a CLEAR_FEATURE request to clear the Bulk-OUT Halt.
ClearFeature(epDataOutIndex);
if (rcode)
pAsync->OnFailed(USBTMCInformation::ClearfeatureError, rcode);
else
pAsync->OnFailed(USBTMCInformation::ClaerSucceed, 0);
commandState = USBTMCState::Idle;
break;
default:
break;
}
if(isResume == true)
{
if(commandState != USBTMCState::Idle && commandState != USBTMCState::Pause )
{
resumedCommandState = commandState;
commandState = USBTMCState::Pause;
}
else
{
isResume = false;
}
}
#undef BUFFER_LENGTH
}
bool USBTMC::IsIdle()
{
if (commandState == USBTMCState::Idle)
return true;
else
return false;
}
bool USBTMC::IsPause()
{
if (commandState == USBTMCState::Pause)
return true;
else
return false;
}
void USBTMC::Pause()
{
isResume = true;
}
void USBTMC::Unpause()
{
isResume = false;
}
void USBTMC::TimeStep(uint32_t value)
{
timestepMillis = value;
}
void USBTMC::EndpointXtract(uint8_t conf, uint8_t iface, uint8_t alt, uint8_t proto __attribute__((unused)), const USB_ENDPOINT_DESCRIPTOR* pep) {
bConfNum = conf;
uint8_t index;
if ((pep->bmAttributes & bmUSB_TRANSFER_TYPE) == USB_TRANSFER_TYPE_INTERRUPT && (pep->bEndpointAddress & 0x80) == 0x80)
index = epInterruptInIndex;
else if ((pep->bmAttributes & bmUSB_TRANSFER_TYPE) == USB_TRANSFER_TYPE_BULK)
index = ((pep->bEndpointAddress & 0x80) == 0x80) ? epDataInIndex : epDataOutIndex;
else
return;
// Fill in the endpoint info structure
epInfo[index].epAddr = (pep->bEndpointAddress & 0x0F);
epInfo[index].maxPktSize = (uint8_t)pep->wMaxPacketSize;
epInfo[index].bmSndToggle = 0;
epInfo[index].bmRcvToggle = 0;
bNumEP++;
}
uint8_t USBTMC::Release()
{
uint8_t rcode = 0;
pUsb->GetAddressPool().FreeAddress(bAddress);
isConnected = false;
bAddress = 0;
bNumEP = 1;
return rcode;
}
uint8_t USBTMC::BulkOutData(uint8_t nbytes, uint8_t* dataptr, uint32_t totalbytes)
{
#define RESERVED_SIZE USBTMC_RCV_HEADER_SIZE
#define DEV_MESSAGE_BEGIN RESERVED_SIZE
uint8_t message[USBTMC_MESSAGE_SIZE];
uint16_t messageSize = RESERVED_SIZE;
uint8_t rcode = 0;
if (nbytes > (USBTMC_MESSAGE_SIZE - RESERVED_SIZE))
{
rcode = USBTMC_ERR_OVERFLOWED;
return rcode;
}
messageSize += nbytes;
if (messageSize > epInfo[epDataOutIndex].maxPktSize)
{
rcode = USBTMC_ERR_OVERFLOWED;
return rcode;
}
//0:MsgID
message[0] = 0x01; //DEV_DEP_MSG_OUT
//1:bTag
message[1] = bTag;
//2:bTagInverse
message[2] = ~bTag;
//3:Reserved(0x00)
message[3] = 0x00;
//4,5,6,7:TransferSize
message[4] = (uint8_t)(totalbytes & 0x000000FF);
message[5] = (uint8_t)(totalbytes >> 8 & 0x000000FF);
message[6] = (uint8_t)(totalbytes >> 16 & 0x000000FF);
message[7] = (uint8_t)(totalbytes >> 24 & 0x000000FF);
//8:bmTransfer Attributes
message[8] = 0x01; //(EOM is set)
//9,10,11:Reserved(0x00)
message[9] = 0x00;
message[10] = 0x00;
message[11] = 0x00;
for (uint16_t i = DEV_MESSAGE_BEGIN; i < messageSize; i++)
message[i] = *dataptr++;
uint16_t quotient = messageSize / 4;
if (messageSize > (quotient * 4))
quotient++;
rcode = pUsb->outTransfer(bAddress, epInfo[epDataOutIndex].epAddr, (quotient * 4), &message[0]);
if (rcode)
return rcode;
last_bTag = bTag;
bTag++;
if(bTag == 0)
{
//The Host must set bTag such that 1<=bTag<=255.
bTag = 1;
}
return rcode;
#undef DEV_MESSAGE_BEGIN
#undef RESERVED_SIZE
}
uint8_t USBTMC::BulkOutData(uint8_t nbytes, uint8_t* dataptr)
{
uint8_t message[USBTMC_MESSAGE_SIZE];
uint16_t messageSize = 0;
uint8_t rcode = 0;
if (nbytes > USBTMC_MESSAGE_SIZE)
{
rcode = USBTMC_ERR_OVERFLOWED;
return rcode;
}
messageSize += nbytes;
if (messageSize > epInfo[epDataOutIndex].maxPktSize)
{
rcode = USBTMC_ERR_OVERFLOWED;
return rcode;
}
for (uint16_t i = 0; i < messageSize; i++)
message[i] = *dataptr++;
uint16_t quotient = messageSize / 4;
if (messageSize > (quotient * 4))
quotient++;
rcode = pUsb->outTransfer(bAddress, epInfo[epDataOutIndex].epAddr, (quotient * 4), &message[0]);
return rcode;
}
uint8_t USBTMC::BulkOutRequest(uint32_t nbytes)
{
#define MESSAGE_SIZE USBTMC_RCV_HEADER_SIZE
uint8_t message[MESSAGE_SIZE];
uint16_t messageSize = MESSAGE_SIZE;
uint8_t rcode = 0;
//0:MsgID
message[0] = 0x02; //REQUEST_DEV_DEP_MSG_IN
//1:bTag
message[1] = bTag;
//2:bTagInverse
message[2] = ~bTag;
//3:Reserved(0x00)
message[3] = 0x00;
//4,5,6,7:TransferSize
message[4] = nbytes & 0xFF;
message[5] = ( nbytes >> 8 )& 0xFF;
message[6] = ( nbytes >> 16 )& 0xFF;
message[7] = ( nbytes >> 24 )& 0xFF;
//8:bmTransfer Attributes
message[8] = 0x00; //D1 = 0 The device must ignore TermChar.
//9:TermChar