/**
* @brief Run in slave mode accepting and processing commands.
*/
void Transfer_Slave(void) {
uint8_t checksum;
TRANSFER_OPCODE opcode;
while (1) {
opcode = (TRANSFER_OPCODE)USB_Receive();
checksum = USB_Receive();
if ((checksum+opcode) != 0xFF) {
USB_Send(TRANSFER_NAK);
continue;
}
USB_Send(TRANSFER_ACK);
switch(opcode) {
case RCV_APP:
Cmd_RCV_APP();
break;
case DEL_APP:
Cmd_DEL_APP();
break;
case LST_APPS:
Cmd_LST_APPS();
break;
case RUN_APP:
Cmd_RUN_APP();
break;
}
}
}
/**
* @brief Sends a command with headers for all the applications in the fs.
* @retval TRANSFER_OK if the send succeeds.
* -TRANSFER_CMD_FAIL if the send fails.
*/
TRANSFER_STATUS Cmd_LST_APPS(void) {
uint8_t checksum, numFiles, i, j;
FS_File *file;
/*** Send number of files in FS ***/
numFiles = FS_GetNumFiles();
checksum = 0xFF - numFiles;
USB_Send(numFiles);
USB_Send(checksum);
if (USB_Receive() == TRANSFER_NAK)
return TRANSFER_CMD_FAIL;
/*** Send files 1 at a time ***/
for (i = 0; i < numFiles; i++) {
file = FS_GetFile(i);
checksum = 0;
USB_Send(file->id);
checksum += file->id;
for (j = 0; j < FS_FILE_MAX_NAME_LEN; j++) {
USB_Send(file->name[j]);
checksum += file->name[j];
}
checksum += file->numPages;
USB_Send(file->numPages);
USB_Send(0xFF-checksum);
if (USB_Receive() != TRANSFER_ACK)
return TRANSFER_CMD_FAIL;
}
return TRANSFER_OK;
}
/**
* @brief Send back data received over USB
*/
void usbCommLoopBack(void)
{
if(USB_GetTxSize() > 0)
{
USB_Send( USB_Receive() );
}
}
/**
* @brief Receives an app. id from a sender and removes it from the fs.
* @retval TRANSFER_OK if the receive and delete succeed.
* -TRANSFER_CMD_FAIL if the receive or delete fail.
*/
TRANSFER_STATUS Cmd_DEL_APP(void) {
uint8_t checksum, id;
/*** Receive file id ***/
id = USB_Receive();
checksum = id;
checksum += USB_Receive();
if(checksum != 0xFF
|| id >= FS_GetNumFiles()
|| FS_DeleteFile(id) != FS_OK) {
USB_Send(TRANSFER_NAK);
return TRANSFER_CMD_FAIL;
}
USB_Send(TRANSFER_ACK);
return TRANSFER_OK;
}
/**
* @brief Receives an app. id, retrieves it from the fs, and runs the app.
* @retval Doesn't return on success. -TRANSFER_CMD_FAIL on failure.
*/
TRANSFER_STATUS Cmd_RUN_APP(void) {
uint8_t checksum, id;
/*** Receive file id ***/
id = USB_Receive();
checksum = id;
checksum += USB_Receive();
if(checksum != 0xFF
|| id >= FS_GetNumFiles()) {
USB_Send(TRANSFER_NAK);
return TRANSFER_CMD_FAIL;
}
USB_Send(TRANSFER_ACK);
//Run the application in the file
FS_RunFile(id);
return TRANSFER_CMD_FAIL; //Shouldn't ever get here.
}
/**
* @brief Reads a received byte over USB if there is actually one.
* @param byte Pointer to the byte to write in if there is a received byte
* @return true if there was a byte to read
* false if there was not
*/
bool usbCommReadByte(uint8_t *byte)
{
uint8_t TxSize = USB_GetTxSize();
if( TxSize > 0){
*byte = USB_Receive();
return true;
}
else{
return false;
}
}
/**
* @brief Reads several received bytes into an array
* @param array Pointer to the array to write received bytes
* @param maxSize The size of the array (= max number of bytes to read)
* @param readSize The number of bytes which where read and written into array
*/
void usbCommReadArray(uint8_t *array, uint16_t maxSize, uint16_t* readSize)
{
uint8_t TxSize = USB_GetTxSize();
uint16_t i=0;
if(maxSize < TxSize){
*readSize = maxSize;
}
else{
*readSize = TxSize;
}
for(i=0;i<*readSize;i++){
array[i] = USB_Receive();
}
return;
}
/**
* @brief Freezes the program until there is an input on the USB
* @return First byte received
*/
uint8_t usbCommWaitInput(void)
{
while(USB_GetTxSize() == 0);
return USB_Receive();
}
/**
* @brief Receives an application from a sender and stores it in the fs.
* @retval TRANSFER_OK if the receive and application store succeed.
* -TRANSFER_CMD_FAIL if the receive or store fail.
*/
TRANSFER_STATUS Cmd_RCV_APP(void) {
uint8_t checksum, name_len, id, numPages, *page;
uint16_t i, j;
char name[FS_FILE_MAX_NAME_LEN];
uint32_t size, remaining, read_amt;
/*** Get # of characters in filename ***/
checksum = 0;
name_len = USB_Receive();
checksum = USB_Receive();
if((checksum+name_len) != 0xFF || name_len > FS_FILE_MAX_NAME_LEN-1) {
USB_Send(TRANSFER_NAK);
return TRANSFER_CMD_FAIL;
}
USB_Send(TRANSFER_ACK);
/*** Get filename ***/
checksum = 0;
for(i = 0; i < name_len; i++) {
name[i] = USB_Receive();
checksum += name[i];
}
name[i] = '\0';
checksum += USB_Receive();
if(checksum != 0xFF) {
USB_Send(TRANSFER_NAK);
return TRANSFER_CMD_FAIL;
}
USB_Send(TRANSFER_ACK);
/*** Get file size in pages ***/
checksum = 0;
size = USB_Receive()
| (USB_Receive() << 8)
| (USB_Receive() << 16)
| (USB_Receive() << 24);
checksum += size & 0xFF;
checksum += (size >> 8) & 0xFF;
checksum += (size >> 16) & 0xFF;
checksum += (size >> 24) & 0xFF;
checksum += USB_Receive();
numPages = FS_RoundPageUp(size);
id = FS_CreateFile(name, numPages);
if (checksum != 0xFF || id == FS_MAX_FILES) {
USB_Send(TRANSFER_NAK);
return TRANSFER_CMD_FAIL;
}
USB_Send(TRANSFER_ACK);
/*** Receive pages 1 at a time ***/
remaining = size;
page = (uint8_t *)malloc(PAGE_SIZE);
for(i = 0; i < numPages; i++) {
memset(page, 0, PAGE_SIZE); //Zero for funs
checksum = 0;
if(remaining < PAGE_SIZE)
read_amt = remaining; //Don't read too much on the last page
else
read_amt = PAGE_SIZE;
for(j = 0; j < read_amt; j++) {
page[j] = USB_Receive();
checksum += page[j];
}
checksum += USB_Receive();
FS_WriteFilePage(id, (uint32_t *)page, i);
if (checksum != 0xFF || id == FS_MAX_FILES) {
USB_Send(TRANSFER_NAK);
FS_DeleteFile(id);
free(page);
return TRANSFER_CMD_FAIL;
}
USB_Send(TRANSFER_ACK);
remaining -= PAGE_SIZE;
}
free(page);
return TRANSFER_OK;
}