// Called in ISR context when a data has been transferred
bool USBMSD::EP2_IN_callback() {
switch (stage) {
// the device has to send data to the host
case PROCESS_CBW:
switch (cbw.CB[0]) {
case READ10:
case READ12:
memoryRead();
break;
}
break;
//the device has to send a CSW
case SEND_CSW:
sendCSW();
break;
// an error has occured
case ERROR:
stallEndpoint(EPBULK_IN);
sendCSW();
break;
// the host has received the CSW -> we wait a CBW
case WAIT_CSW:
stage = READ_CBW;
break;
case READ_CBW:
break;
}
return true;
}
void USBMSD::memoryVerify (uint8_t * buf, uint16_t size) {
uint32_t n;
if ((addr + size) > MemorySize) {
size = MemorySize - addr;
stage = ERROR;
stallEndpoint(EPBULK_OUT);
}
// beginning of a new block -> load a whole block in RAM
if (!(addr%BlockSize))
disk_read(page, addr/BlockSize);
// info are in RAM -> no need to re-read memory
for (n = 0; n < size; n++) {
if (page[addr%BlockSize + n] != buf[n]) {
memOK = false;
break;
}
}
addr += size;
length -= size;
csw.DataResidue -= size;
if ( !length || (stage != PROCESS_CBW)) {
csw.Status = (memOK && (stage == PROCESS_CBW)) ? CSW_PASSED : CSW_FAILED;
sendCSW();
}
}
void USBMSD::memoryWrite (uint8_t * buf, uint16_t size) {
if ((addr + size) > MemorySize) {
size = MemorySize - addr;
stage = ERROR;
stallEndpoint(EPBULK_OUT);
}
// we fill an array in RAM of 1 block before writing it in memory
for (int i = 0; i < size; i++)
page[addr%BlockSize + i] = buf[i];
// if the array is filled, write it in memory
if (!((addr + size)%BlockSize)) {
if (!(disk_status() & WRITE_PROTECT)) {
disk_write(page, addr/BlockSize);
}
}
addr += size;
length -= size;
csw.DataResidue -= size;
if ((!length) || (stage != PROCESS_CBW)) {
csw.Status = (stage == ERROR) ? CSW_FAILED : CSW_PASSED;
sendCSW();
}
}
// Called in ISR context called when a data is received
bool USBMSD::EP2_OUT_callback() {
uint32_t size = 0;
uint8_t buf[MAX_PACKET_SIZE_EPBULK];
readEP(EPBULK_OUT, buf, &size, MAX_PACKET_SIZE_EPBULK);
switch (stage) {
// the device has to decode the CBW received
case READ_CBW:
CBWDecode(buf, size);
break;
// the device has to receive data from the host
case PROCESS_CBW:
switch (cbw.CB[0]) {
case WRITE10:
case WRITE12:
memoryWrite(buf, size);
break;
case VERIFY10:
memoryVerify(buf, size);
break;
}
break;
// an error has occured: stall endpoint and send CSW
default:
stallEndpoint(EPBULK_OUT);
csw.Status = CSW_ERROR;
sendCSW();
break;
}
//reactivate readings on the OUT bulk endpoint
readStart(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);
return true;
}
bool USBCDCMSC::infoTransfer (void) {
uint32_t n;
// Logical Block Address of First Block
n = (cbw.CB[2] << 24) | (cbw.CB[3] << 16) | (cbw.CB[4] << 8) | (cbw.CB[5] << 0);
addr = n * BlockSize;
// Number of Blocks to transfer
switch (cbw.CB[0]) {
case READ10:
case WRITE10:
case VERIFY10:
n = (cbw.CB[7] << 8) | (cbw.CB[8] << 0);
break;
case READ12:
case WRITE12:
n = (cbw.CB[6] << 24) | (cbw.CB[7] << 16) | (cbw.CB[8] << 8) | (cbw.CB[9] << 0);
break;
}
length = n * BlockSize;
if (!cbw.DataLength) { // host requests no data
csw.Status = CSW_FAILED;
sendCSW();
return false;
}
if (cbw.DataLength != length) {
if ((cbw.Flags & 0x80) != 0) {
stallEndpoint(MSDBULK_IN);
} else {
stallEndpoint(MSDBULK_OUT);
}
csw.Status = CSW_FAILED;
sendCSW();
return false;
}
return true;
}
void USBCDCMSC::testUnitReady (void) {
if (cbw.DataLength != 0) {
if ((cbw.Flags & 0x80) != 0) {
stallEndpoint(MSDBULK_IN);
} else {
stallEndpoint(MSDBULK_OUT);
}
}
csw.Status = CSW_PASSED;
sendCSW();
}
static void testUnitReady(void)
{
if (cbw.DataLength != 0) {
if ((cbw.Flags & 0x80) != 0) {
SYS_LOG_DBG("TUR - BI - STALL");
usb_ep_set_stall(EPBULK_IN);
} else {
SYS_LOG_DBG("TUR - BO - STALL");
usb_ep_set_stall(EPBULK_OUT);
}
}
csw.Status = CSW_PASSED;
sendCSW();
}
void USBCDCMSC::CBWDecode(uint8_t * buf, uint16_t size) {
if (size == sizeof(cbw)) {
memcpy((uint8_t *)&cbw, buf, size);
if (cbw.Signature == CBW_Signature) {
csw.Tag = cbw.Tag;
csw.DataResidue = cbw.DataLength;
if ((cbw.CBLength < 1) || (cbw.CBLength > 16) ) {
fail();
} else {
switch (cbw.CB[0]) {
case TEST_UNIT_READY:
testUnitReady();
break;
case REQUEST_SENSE:
requestSense();
break;
case INQUIRY:
inquiryRequest();
break;
case MODE_SENSE6:
modeSense6();
break;
case READ_FORMAT_CAPACITIES:
readFormatCapacity();
break;
case MEDIA_REMOVAL:
mediaRemoval();
break;
case READ_CAPACITY:
readCapacity();
break;
case READ10:
case READ12:
if (infoTransfer()) {
if ((cbw.Flags & 0x80)) {
stage = PROCESS_CBW;
memoryRead();
} else {
stallEndpoint(MSDBULK_OUT);
csw.Status = CSW_ERROR;
sendCSW();
}
}
break;
case WRITE10:
case WRITE12:
if (infoTransfer()) {
if (!(cbw.Flags & 0x80)) {
stage = PROCESS_CBW;
} else {
stallEndpoint(MSDBULK_IN);
csw.Status = CSW_ERROR;
sendCSW();
}
}
break;
case VERIFY10:
if (!(cbw.CB[1] & 0x02)) {
csw.Status = CSW_PASSED;
sendCSW();
break;
}
if (infoTransfer()) {
if (!(cbw.Flags & 0x80)) {
stage = PROCESS_CBW;
memOK = true;
} else {
stallEndpoint(MSDBULK_IN);
csw.Status = CSW_ERROR;
sendCSW();
}
}
break;
default:
fail();
break;
}
}
}
}
}
void USBCDCMSC::fail() {
csw.Status = CSW_FAILED;
sendCSW();
}
void USBCDCMSC::mediaRemoval() {
csw.Status = CSW_PASSED;
sendCSW();
}
void USBMSD::fail() {
csw.Status = CSW_FAILED;
sendCSW();
}