void TxBuffer_Setting(void)
{
BYTE *tempBuf;
txBuffer.state = currentState;
txBuffer.chamber_h = chamber_h;
txBuffer.chamber_l = chamber_l;
// Convert float type to BYTE pointer
tempBuf = (BYTE*)&(currentTemp);
memcpy(&(txBuffer.chamber_temp_1), tempBuf, sizeof(float));
txBuffer.photodiode_h = photodiode_h;
txBuffer.photodiode_l = photodiode_l;
// Checking the PC Software error & firmware error.
txBuffer.currentError = currentError;
// For request
txBuffer.request_data = request_data;
// For setting the arrival
// 150904 YJ
txBuffer.targetArrival = fallingTargetArrival;
// Copy the txBuffer struct to rawBuffer
// and clear previous buffer
USBMaskInterrupts();
memset(&rxBuffer, 0, sizeof(RxBuffer));
memcpy(&ToSendDataBuffer, &txBuffer, sizeof(TxBuffer));
USBUnmaskInterrupts();
}
void FlashDoTX(void)
{
BYTE SendNow;
USBMaskInterrupts();
if (!USBHandleBusy(FlashDataInHandle)) {
switch (FlashTxState) {
case FLASH_TX_COMPLETING:
FlashTxState = FLASH_TX_READY;
break;
case FLASH_TX_BUSY:
SendNow = FlashTxLen > sizeof(FlashTxBuffer) ? sizeof(FlashTxBuffer) : FlashTxLen;
FlashTxCBF((BYTE *) &FlashTxBuffer, SendNow);
FlashTxLen -= SendNow;
if(FlashTxLen == 0)
FlashTxState = FLASH_TX_COMPLETING;
FlashDataInHandle = USBTxOnePacket(NAND_TX_EP,(BYTE*)&FlashTxBuffer, SendNow);
break;
}
}
USBUnmaskInterrupts();
}
void USBCBSendResume() {
static uint16_t delay_count;
if (USBGetRemoteWakeupStatus() == true) {
//Verify that the USB bus is in fact suspended, before we send
//remote wakeup signalling.
if (USBIsBusSuspended() == true) {
USBMaskInterrupts();
//Clock switch to settings consistent with normal USB operation.
USBCBWakeFromSuspend();
USBSuspendControl = 0;
USBBusIsSuspended = false; //So we don't execute this code again,
//until a new suspend condition is detected.
delay_count = 3600U;
do {
delay_count--;
} while (delay_count);
//Now drive the resume K-state signalling onto the USB bus.
USBResumeControl = 1; // Start RESUME signaling
delay_count = 1800U; // Set RESUME line for 1-13 ms
do {
delay_count--;
} while (delay_count);
USBResumeControl = 0; //Finished driving resume signalling
USBUnmaskInterrupts();
}
}
}
/******************************************************************************
Function:
void putUSBUSART(char *data, BYTE length)
Summary:
putUSBUSART writes an array of data to the USB. Use this version, is
capable of transfering 0x00 (what is typically a NULL character in any of
the string transfer functions).
Description:
putUSBUSART writes an array of data to the USB. Use this version, is
capable of transfering 0x00 (what is typically a NULL character in any of
the string transfer functions).
Typical Usage:
<code>
if(USBUSARTIsTxTrfReady())
{
char data[] = {0x00, 0x01, 0x02, 0x03, 0x04};
putUSBUSART(data,5);
}
</code>
The transfer mechanism for device-to-host(put) is more flexible than
host-to-device(get). It can handle a string of data larger than the
maximum size of bulk IN endpoint. A state machine is used to transfer a
\long string of data over multiple USB transactions. CDCTxService()
must be called periodically to keep sending blocks of data to the host.
Conditions:
USBUSARTIsTxTrfReady() must return TRUE. This indicates that the last
transfer is complete and is ready to receive a new block of data. The
string of characters pointed to by 'data' must equal to or smaller than
255 BYTEs.
Input:
char *data - pointer to a RAM array of data to be transfered to the host
BYTE length - the number of bytes to be transfered (must be less than 255).
*****************************************************************************/
void putUSBUSART(char *data, BYTE length)
{
/*
* User should have checked that cdc_trf_state is in CDC_TX_READY state
* before calling this function.
* As a safety precaution, this fuction checks the state one more time
* to make sure it does not override any pending transactions.
*
* Currently it just quits the routine without reporting any errors back
* to the user.
*
* Bottomline: User MUST make sure that USBUSARTIsTxTrfReady()==1
* before calling this function!
* Example:
* if(USBUSARTIsTxTrfReady())
* putUSBUSART(pData, Length);
*
* IMPORTANT: Never use the following blocking while loop to wait:
* while(!USBUSARTIsTxTrfReady())
* putUSBUSART(pData, Length);
*
* The whole firmware framework is written based on cooperative
* multi-tasking and a blocking code is not acceptable.
* Use a state machine instead.
*/
USBMaskInterrupts();
if(cdc_trf_state == CDC_TX_READY)
{
mUSBUSARTTxRam((BYTE*)data, length); // See cdc.h
}
USBUnmaskInterrupts();
}//end putUSBUSART
uint16_t AsebaGetBuffer(AsebaVMState *vm, uint8_t * data, uint16_t maxLength, uint16_t* source) {
int flags;
uint16_t ret = 0;
size_t u;
// Touching the FIFO, mask the interrupt ...
USBMaskInterrupts(flags);
u = get_used(&AsebaUsb.rx);
/* Minium packet size == len + src + msg_type == 6 bytes */
if(u >= 6) {
int len;
fifo_peek((unsigned char *) &len, &AsebaUsb.rx, 2);
if (u >= len + 6) {
memcpy_out_fifo((unsigned char *) &len, &AsebaUsb.rx, 2);
memcpy_out_fifo((unsigned char *) source, &AsebaUsb.rx, 2);
// msg_type is not in the len but is always present
len = len + 2;
/* Yay ! We have a complete packet ! */
if(len > maxLength)
len = maxLength;
memcpy_out_fifo(data, &AsebaUsb.rx, len);
ret = len;
}
}
if(usb_uart_serial_port_open())
USBCDCKickRx();
else
fifo_reset(&AsebaUsb.rx);
USBUnmaskInterrupts(flags);
return ret;
}
void USBCBSendResume(void){
static WORD delay_count;
//should be checked).
if(USBGetRemoteWakeupStatus() == TRUE){
if(USBIsBusSuspended() == TRUE){
USBMaskInterrupts();
//Clock switch to settings consistent with normal USB operation.
USBCBWakeFromSuspend();
USBSuspendControl = 0;
USBBusIsSuspended = FALSE;
delay_count = 3600U;
do{
delay_count--;
}while(delay_count);
//Now drive the resume K-state signalling onto the USB bus.
USBResumeControl = 1; // Start RESUME signaling
delay_count = 1800U; // Set RESUME line for 1-13 ms
do{
delay_count--;
}while(delay_count);
USBResumeControl = 0; //Finished driving resume signalling
USBUnmaskInterrupts();
}
}
}
/**************************************************************************
Function:
void putrsUSBUSART(const ROM char *data)
Summary:
putrsUSBUSART writes a string of data to the USB including the null
character. Use this version, 'putrs', to transfer data literals and
data located in program memory.
Description:
putrsUSBUSART writes a string of data to the USB including the null
character. Use this version, 'putrs', to transfer data literals and
data located in program memory.
Typical Usage:
<code>
if(USBUSARTIsTxTrfReady())
{
putrsUSBUSART("Hello World");
}
</code>
The transfer mechanism for device-to-host(put) is more flexible than
host-to-device(get). It can handle a string of data larger than the
maximum size of bulk IN endpoint. A state machine is used to transfer a
\long string of data over multiple USB transactions. CDCTxService()
must be called periodically to keep sending blocks of data to the host.
Conditions:
USBUSARTIsTxTrfReady() must return TRUE. This indicates that the last
transfer is complete and is ready to receive a new block of data. The
string of characters pointed to by 'data' must equal to or smaller than
255 BYTEs.
Input:
const ROM char *data - null\-terminated string of constant data. If a
null character is not found, 255 BYTEs of data
will be transferred to the host.
**************************************************************************/
void putrsUSBUSART(const ROM char *data)
{
BYTE len;
const ROM char *pData;
/*
* User should have checked that cdc_trf_state is in CDC_TX_READY state
* before calling this function.
* As a safety precaution, this fuction checks the state one more time
* to make sure it does not override any pending transactions.
*
* Currently it just quits the routine without reporting any errors back
* to the user.
*
* Bottomline: User MUST make sure that USBUSARTIsTxTrfReady()
* before calling this function!
* Example:
* if(USBUSARTIsTxTrfReady())
* putsUSBUSART(pData);
*
* IMPORTANT: Never use the following blocking while loop to wait:
* while(cdc_trf_state != CDC_TX_READY)
* putsUSBUSART(pData);
*
* The whole firmware framework is written based on cooperative
* multi-tasking and a blocking code is not acceptable.
* Use a state machine instead.
*/
USBMaskInterrupts();
if(cdc_trf_state != CDC_TX_READY)
{
USBUnmaskInterrupts();
return;
}
/*
* While loop counts the number of BYTEs to send including the
* null character.
*/
len = 0;
pData = data;
do
{
len++;
if(len == 255) break; // Break loop once max len is reached.
}while(*pData++);
/*
* Second piece of information (length of data to send) is ready.
* Call mUSBUSARTTxRom to setup the transfer.
* The actual transfer process will be handled by CDCTxService(),
* which should be called once per Main Program loop.
*/
mUSBUSARTTxRom((ROM BYTE*)data,len); // See cdc.h
USBUnmaskInterrupts();
}//end putrsUSBUSART
void putcUSBUSART(char data)
{
USBMaskInterrupts();
if(cdc_trf_state == CDC_TX_READY)
{
mUSBUSARTTxRam((BYTE*)&data, 1); // See cdc.h
}
USBUnmaskInterrupts();
}
/********************************************************************
* Function: void USBCBSendResume(void)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: The USB specifications allow some types of USB
* peripheral devices to wake up a host PC (such
* as if it is in a low power suspend to RAM state).
* This can be a very useful feature in some
* USB applications, such as an Infrared remote
* control receiver. If a user presses the "power"
* button on a remote control, it is nice that the
* IR receiver can detect this signalling, and then
* send a USB "command" to the PC to wake up.
*
* The USBCBSendResume() "callback" function is used
* to send this special USB signalling which wakes
* up the PC. This function may be called by
* application firmware to wake up the PC. This
* function will only be able to wake up the host if
* all of the below are true:
*
* 1. The USB driver used on the host PC supports
* the remote wakeup capability.
* 2. The USB configuration descriptor indicates
* the device is remote wakeup capable in the
* bmAttributes field.
* 3. The USB host PC is currently sleeping,
* and has previously sent your device a SET
* FEATURE setup packet which "armed" the
* remote wakeup capability.
*
* If the host has not armed the device to perform remote wakeup,
* then this function will return without actually performing a
* remote wakeup sequence. This is the required behavior,
* as a USB device that has not been armed to perform remote
* wakeup must not drive remote wakeup signalling onto the bus;
* doing so will cause USB compliance testing failure.
*
* This callback should send a RESUME signal that
* has the period of 1-15ms.
*
* Note: This function does nothing and returns quickly, if the USB
* bus and host are not in a suspended condition, or are
* otherwise not in a remote wakeup ready state. Therefore, it
* is safe to optionally call this function regularly, ex:
* anytime application stimulus occurs, as the function will
* have no effect, until the bus really is in a state ready
* to accept remote wakeup.
*
* When this function executes, it may perform clock switching,
* depending upon the application specific code in
* USBCBWakeFromSuspend(). This is needed, since the USB
* bus will no longer be suspended by the time this function
* returns. Therefore, the USB module will need to be ready
* to receive traffic from the host.
*
* The modifiable section in this routine may be changed
* to meet the application needs. Current implementation
* temporary blocks other functions from executing for a
* period of ~3-15 ms depending on the core frequency.
*
* According to USB 2.0 specification section 7.1.7.7,
* "The remote wakeup device must hold the resume signaling
* for at least 1 ms but for no more than 15 ms."
* The idea here is to use a delay counter loop, using a
* common value that would work over a wide range of core
* frequencies.
* That value selected is 1800. See table below:
* ==========================================================
* Core Freq(MHz) MIP RESUME Signal Period (ms)
* ==========================================================
* 48 12 1.05
* 4 1 12.6
* ==========================================================
* * These timing could be incorrect when using code
* optimization or extended instruction mode,
* or when having other interrupts enabled.
* Make sure to verify using the MPLAB SIM's Stopwatch
* and verify the actual signal on an oscilloscope.
*******************************************************************/
void USBCBSendResume(void)
{
static WORD delay_count;
//First verify that the host has armed us to perform remote wakeup.
//It does this by sending a SET_FEATURE request to enable remote wakeup,
//usually just before the host goes to standby mode (note: it will only
//send this SET_FEATURE request if the configuration descriptor declares
//the device as remote wakeup capable, AND, if the feature is enabled
//on the host (ex: on Windows based hosts, in the device manager
//properties page for the USB device, power management tab, the
//"Allow this device to bring the computer out of standby." checkbox
//should be checked).
if(USBGetRemoteWakeupStatus() == TRUE)
{
//Verify that the USB bus is in fact suspended, before we send
//remote wakeup signalling.
if(USBIsBusSuspended() == TRUE)
{
USBMaskInterrupts();
//Clock switch to settings consistent with normal USB operation.
USBCBWakeFromSuspend();
USBSuspendControl = 0;
USBBusIsSuspended = FALSE; //So we don't execute this code again,
//until a new suspend condition is detected.
//Section 7.1.7.7 of the USB 2.0 specifications indicates a USB
//device must continuously see 5ms+ of idle on the bus, before it sends
//remote wakeup signalling. One way to be certain that this parameter
//gets met, is to add a 2ms+ blocking delay here (2ms plus at
//least 3ms from bus idle to USBIsBusSuspended() == TRUE, yeilds
//5ms+ total delay since start of idle).
delay_count = 3600U;
do
{
delay_count--;
}while(delay_count);
//Now drive the resume K-state signalling onto the USB bus.
USBResumeControl = 1; // Start RESUME signaling
delay_count = 1800U; // Set RESUME line for 1-13 ms
do
{
delay_count--;
}while(delay_count);
USBResumeControl = 0; //Finished driving resume signalling
USBUnmaskInterrupts();
}
}
}
void USBCBSendResume(void)
{
static WORD delay_count;
if(USBGetRemoteWakeupStatus() == TRUE)
{
// Verify that the USB bus is in fact suspended, before we send
// remote wakeup signalling.
if(USBIsBusSuspended() == TRUE)
{
USBMaskInterrupts();
// Clock switch to settings consistent with normal USB operation.
// USBCBWakeFromSuspend();
USBSuspendControl = 0;
USBBusIsSuspended = FALSE; // So we don't execute this code again,
// until a new suspend condition is
// detected.
// Section 7.1.7.7 of the USB 2.0 specifications indicates a USB
// device must continuously see 5ms+ of idle on the bus, before it
// sends remote wakeup signalling. One way to be certain that this
// parameter gets met, is to add a 2ms+ blocking delay here
// (2ms plus at least 3ms from bus idle to
// USBIsBusSuspended() == TRUE, yeilds 5ms+ total delay since start
// of idle).
delay_count = 3600U;
do
{
delay_count--;
}while(delay_count);
//Now drive the resume K-state signalling onto the USB bus.
USBResumeControl = 1; // Start RESUME signaling
delay_count = 1800U; // Set RESUME line for 1-13 ms
do
{
delay_count--;
}while(delay_count);
USBResumeControl = 0; //Finished driving resume signalling
USBUnmaskInterrupts();
}
}
}
// Send resume call-back
void USBCBSendResume(void)
{
static WORD delay_count;
// Verify that the host has armed us to perform remote wakeup.
if(USBGetRemoteWakeupStatus() == FLAG_TRUE)
{
// Verify that the USB bus is suspended (before we send remote wakeup signalling).
if(USBIsBusSuspended() == FLAG_TRUE)
{
USBMaskInterrupts();
// Bring the clock speed up to normal running state
USBCBWakeFromSuspend();
USBSuspendControl = 0;
USBBusIsSuspended = FLAG_FALSE;
// Section 7.1.7.7 of the USB 2.0 specifications indicates a USB
// device must continuously see 5ms+ of idle on the bus, before it sends
// remote wakeup signalling. One way to be certain that this parameter
// gets met, is to add a 2ms+ blocking delay here (2ms plus at
// least 3ms from bus idle to USBIsBusSuspended() == FLAG_TRUE, yeilds
// 5ms+ total delay since start of idle).
delay_count = 3600U;
do
{
delay_count--;
} while(delay_count);
// Start RESUME signaling for 1-13 ms
USBResumeControl = 1;
delay_count = 1800U;
do
{
delay_count--;
} while(delay_count);
USBResumeControl = 0;
USBUnmaskInterrupts();
}
}
}
void read_PSK1_HW_clock(unsigned int period, unsigned int ticks, BYTE *data, unsigned int bits, unsigned int timeout_us, unsigned int min_pulse_us)
{
// point globals at data for ISR
EMU_Data= data;
HW_Bits= bits;
PSK_Min_Pulse= min_pulse_us;
PSK_Read_Error= FALSE;
memset(EMU_Data, '\0', bits);
// stop USB interfering
USBMaskInterrupts();
// start clock if not already running
if(!mGetLED_Clock() == mLED_ON)
{
InitHWReaderClock(OC_TOGGLE_PULSE, period / 2L, period, RWD_STATE_ACTIVE);
// give reader time to wake up and settle
Delay_us((RFIDlerConfig.FrameClock * RFIDlerConfig.RWD_Wake_Period) / 100);
}
// reset timer for timeout
GetTimer_us(RESET);
// align ourselves to reader's bit period by finding start of a pulse
while(READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return;
while(!READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return;
// reset timer for external timeouts
GetTimer_us(RESET);
// start ISR to read PSK data
InitHWReaderISR(CONVERT_TO_TICKS(period) * ticks - 1L, TRUE);
}
void AsebaSendBuffer(AsebaVMState *vm, const uint8_t *data, uint16_t length) {
int flags;
// Here we must loop until we can send the data.
// BUT if the usb connection is not available, we drop the packet
if(!usb_uart_serial_port_open())
return;
// Sanity check, should never be true
if (length < 2)
return;
do {
USBMaskInterrupts(flags);
if(get_free(&AsebaUsb.tx) > length + 4) {
length -= 2;
memcpy_to_fifo(&AsebaUsb.tx, (unsigned char *) &length, 2);
memcpy_to_fifo(&AsebaUsb.tx, (unsigned char *) &vm->nodeId, 2);
memcpy_to_fifo(&AsebaUsb.tx, (unsigned char *) data, length + 2);
// Will callback AsebaUsbTxReady
if (!tx_busy) {
tx_busy = 1;
USBCDCKickTx();
}
length = 0;
}
// Usb can be disconnected while sending ...
if(!usb_uart_serial_port_open()) {
fifo_reset(&AsebaUsb.tx);
USBUnmaskInterrupts(flags);
break;
}
USBUnmaskInterrupts(flags);
} while(length);
}
void CDCTxService(void)
{
BYTE byte_to_send;
BYTE i;
USBMaskInterrupts();
CDCNotificationHandler();
if(USBHandleBusy(CDCDataInHandle))
{
USBUnmaskInterrupts();
return;
}
/*
* Completing stage is necessary while [ mCDCUSartTxIsBusy()==1 ].
* By having this stage, user can always check cdc_trf_state,
* and not having to call mCDCUsartTxIsBusy() directly.
*/
if(cdc_trf_state == CDC_TX_COMPLETING)
cdc_trf_state = CDC_TX_READY;
/*
* If CDC_TX_READY state, nothing to do, just return.
*/
if(cdc_trf_state == CDC_TX_READY)
{
USBUnmaskInterrupts();
return;
}
/*
* If CDC_TX_BUSY_ZLP state, send zero length packet
*/
if(cdc_trf_state == CDC_TX_BUSY_ZLP)
{
CDCDataInHandle = USBTxOnePacket(CDC_DATA_EP,NULL,0);
//CDC_DATA_BD_IN.CNT = 0;
cdc_trf_state = CDC_TX_COMPLETING;
}
else if(cdc_trf_state == CDC_TX_BUSY)
{
/*
* First, have to figure out how many byte of data to send.
*/
if(cdc_tx_len > sizeof(cdc_data_tx))
byte_to_send = sizeof(cdc_data_tx);
else
byte_to_send = cdc_tx_len;
/*
* Subtract the number of bytes just about to be sent from the total.
*/
cdc_tx_len = cdc_tx_len - byte_to_send;
pCDCDst.bRam = (BYTE*)&cdc_data_tx; // Set destination pointer
i = byte_to_send;
if(cdc_mem_type == USB_EP0_ROM) // Determine type of memory source
{
while(i)
{
*pCDCDst.bRam = *pCDCSrc.bRom;
pCDCDst.bRam++;
pCDCSrc.bRom++;
i--;
}//end while(byte_to_send)
}
else // _RAM
{
while(i)
{
*pCDCDst.bRam = *pCDCSrc.bRam;
pCDCDst.bRam++;
pCDCSrc.bRam++;
i--;
}//end while(byte_to_send._word)
}//end if(cdc_mem_type...)
/*
* Lastly, determine if a zero length packet state is necessary.
* See explanation in USB Specification 2.0: Section 5.8.3
*/
if(cdc_tx_len == 0)
{
if(byte_to_send == CDC_DATA_IN_EP_SIZE)
cdc_trf_state = CDC_TX_BUSY_ZLP;
else
cdc_trf_state = CDC_TX_COMPLETING;
}//end if(cdc_tx_len...)
CDCDataInHandle = USBTxOnePacket(CDC_DATA_EP,(BYTE*)&cdc_data_tx,byte_to_send);
}//end if(cdc_tx_sate == CDC_TX_BUSY)
USBUnmaskInterrupts();
}//end CDCTxService
void USBCCIDBulkInService(void)
{
WORD byte_to_send;
BYTE i;
USBMaskInterrupts();
if(USBHandleBusy(usbCcidBulkInHandle))
{
USBUnmaskInterrupts();
return;
}
if(usbCcidBulkInTrfState == USB_CCID_BULK_IN_COMPLETING)
usbCcidBulkInTrfState = USB_CCID_BULK_IN_READY;
/*
* If USB_CCID_BULK_IN_READY state, nothing to do, just return.
*/
if(usbCcidBulkInTrfState == USB_CCID_BULK_IN_READY)
{
USBUnmaskInterrupts();
return;
}
/*
* If USB_CCID_BULK_IN_BUSY_ZLP state, send zero length packet
*/
if(usbCcidBulkInTrfState == USB_CCID_BULK_IN_BUSY_ZLP)
{
usbCcidBulkInHandle = USBTxOnePacket(USB_EP_BULK_IN,NULL,0);
usbCcidBulkInTrfState = USB_CCID_BULK_IN_COMPLETING;
}
else if(usbCcidBulkInTrfState == USB_CCID_BULK_IN_BUSY)
{
/*
* First, have to figure out how many byte of data to send.
*/
if(usbCcidBulkInLen > sizeof(usbCcidBulkInEndpoint))
byte_to_send = sizeof(usbCcidBulkInEndpoint);
else
byte_to_send = usbCcidBulkInLen;
/*
* Subtract the number of bytes just about to be sent from the total.
*/
usbCcidBulkInLen = usbCcidBulkInLen - byte_to_send;
pCCIDDst.bRam = (BYTE*)usbCcidBulkInEndpoint; // Set destination pointer
i = byte_to_send;
while(i)
{
*pCCIDDst.bRam = *pCCIDSrc.bRam;
pCCIDDst.bRam++;
pCCIDSrc.bRam++;
i--;
}//end while(byte_to_send._word)
/*
* Lastly, determine if a zero length packet state is necessary.
* See explanation in USB Specification 2.0: Section 5.8.3
*/
if(usbCcidBulkInLen == 0)
{
if(byte_to_send == USB_EP_SIZE)
usbCcidBulkInTrfState = USB_CCID_BULK_IN_BUSY_ZLP;
else
usbCcidBulkInTrfState = USB_CCID_BULK_IN_COMPLETING;
}//end if(usbCcidBulkInLen...)
usbCcidBulkInHandle = USBTxOnePacket(USB_EP_BULK_IN,(BYTE*)usbCcidBulkInEndpoint,byte_to_send);
}//end if(cdc_tx_sate == USB_CCID_BULK_IN_BUSY)
USBUnmaskInterrupts();
}//end USBCCIDBulkInService
// h/w clock reader - initialise data pointers for ISR and start timers
// timer2 creates clock output for external reader
// timer4 reads data bit values
// period_us == clock for reader
// ticks == clock periods per bit
// bits == number of bits to read
// oneshot must be set if we are reading data in response to RWD, so no repeating stream
BOOL read_ASK_HW_clock(unsigned int period, unsigned int ticks, BYTE *data, unsigned int bits, unsigned int timeout_us, BOOL oneshot)
{
unsigned long dwell, time;
BYTE count;
Manchester_Error= FALSE;
// if we're manchester or bi-phase encoding, we want to clock twice as fast so we can read both halves of the bit
if(RFIDlerConfig.Manchester || RFIDlerConfig.BiPhase)
{
ticks /= 2;
HW_Bits= (unsigned long) bits * 2;
}
else
HW_Bits= (unsigned long) bits;
// point globals at data for ISR
EMU_Data= data;
memset(EMU_Data, '\0', bits);
// stop USB interfering
USBMaskInterrupts();
// start clock if not already running
if(!mGetLED_Clock() == mLED_ON)
{
InitHWReaderClock(OC_TOGGLE_PULSE, period / 2L, period, RWD_STATE_ACTIVE);
// give reader time to wake up and settle
Delay_us((RFIDlerConfig.FrameClock * RFIDlerConfig.RWD_Wake_Period) / 100);
}
// align ourselves to reader's bit period by waiting until the end of a pulse
GetTimer_us(RESET);
count= READER_DATA;
while(count == READER_DATA)
if(GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
// convert to ticks
period= CONVERT_TO_TICKS(period);
// biphase cannot auto-align when it detects a half-bit error, so we must align
// on a full bit before we start
if(!oneshot && RFIDlerConfig.BiPhase)
{
dwell= period * ticks * 2;
count= 0;
while((time= get_reader_gap(timeout_us)))
{
if(!time || count == 255)
return;
else
if(approx(time, dwell, 10))
break;
++count;
}
}
// wait for half the bit period so we sample mid-tick, not just as bit is toggling
dwell= ((period * ticks) / 2L);
GetTimer_ticks(RESET);
//DEBUG_PIN_2= HIGH;
while(GetTimer_ticks(NO_RESET) < dwell)
;
// reset timer for external timeouts
GetTimer_us(RESET);
//DEBUG_PIN_2= LOW;
// re-start reader ISR to read this bit if required
InitHWReaderISR(period * ticks - 1L, TRUE);
return TRUE;
}
BOOL read_FSK_HW_clock(unsigned int period, unsigned int ticks, BYTE *data, unsigned int bits, unsigned int timeout_us)
{
unsigned int gaplength;
// point globals at data for ISR
EMU_Data= data;
HW_Bits= bits;
memset(EMU_Data, '\0', bits);
// stop USB interfering
USBMaskInterrupts();
// start clock if not already running
if(!mGetLED_Clock() == mLED_ON)
{
InitHWReaderClock(OC_TOGGLE_PULSE, period / 2L, period, RWD_STATE_ACTIVE);
// give reader time to wake up and settle
Delay_us((RFIDlerConfig.FrameClock * RFIDlerConfig.RWD_Wake_Period) / 100);
}
// reset timer for timeout
GetTimer_us(RESET);
// align ourselves to reader's bit period by finding the end of a pulse train.
// we can do this by measuring the gaps. when they become significantly different
// sized (more than 25%), we have just switched frequency.
// find the start of a pulse
while(READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
while(!READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
while(READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
// reset timer so we can meausure gap period
GetTimer_us(RESET);
while(!READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
gaplength= GetTimer_us(RESET);
// now look for a gap that doesn't match
while(42)
{
while(READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
GetTimer_us(TRUE);
while(!READER_DATA)
if(timeout_us)
if (GetTimer_us(NO_RESET) > timeout_us)
return FALSE;
if(!approx(GetTimer_us(NO_RESET), gaplength, FSK_TOLERANCE))
break;
}
// reset timer for external timeouts
GetTimer_us(RESET);
// start ISR to read FSK data
InitHWReaderISR(CONVERT_TO_TICKS(period) * ticks - 1L, TRUE);
return TRUE;
}