/**
* Try and get a character for transmission.
* \return The next byte to transmit or -1 if there is none.
*/
int jshGetCharToTransmit(
IOEventFlags device // The device being looked at for a transmission.
) {
if (DEVICE_IS_USART(device)) {
JshSerialDeviceState *deviceState = &jshSerialDeviceStates[TO_SERIAL_DEVICE_STATE(device)];
if ((*deviceState)&SDS_XOFF_PENDING) {
(*deviceState) = ((*deviceState)&(~SDS_XOFF_PENDING)) | SDS_XOFF_SENT;
return 19/*XOFF*/;
}
if ((*deviceState)&SDS_XON_PENDING) {
(*deviceState) = ((*deviceState)&(~(SDS_XON_PENDING|SDS_XOFF_SENT)));
return 17/*XON*/;
}
}
unsigned char tempTail = txTail;
while (txHead != tempTail) {
if (IOEVENTFLAGS_GETTYPE(txBuffer[tempTail].flags) == device) {
unsigned char data = txBuffer[tempTail].data;
if (tempTail != txTail) { // so we weren't right at the back of the queue
// we need to work back from tempTail (until we hit tail), shifting everything forwards
unsigned char this = tempTail;
unsigned char last = (unsigned char)((this+TXBUFFERMASK)&TXBUFFERMASK);
while (this!=txTail) { // if this==txTail, then last is before it, so stop here
txBuffer[this] = txBuffer[last];
this = last;
last = (unsigned char)((this+TXBUFFERMASK)&TXBUFFERMASK);
}
}
txTail = (unsigned char)((txTail+1)&TXBUFFERMASK); // advance the tail
return data; // return data
}
/**
* Initialize all the devices.
*/
void jshInitDevices() { // called from jshInit
unsigned int i;
// setup flow control
for (i=0;i<sizeof(jshSerialDeviceStates) / sizeof(JshSerialDeviceState);i++)
jshSerialDeviceStates[i] = SDS_NONE;
jshSerialDeviceStates[TO_SERIAL_DEVICE_STATE(EV_USBSERIAL)] = SDS_FLOW_CONTROL_XON_XOFF;
// set up callbacks for events
for (i=EV_EXTI0;i<=EV_EXTI_MAX;i++)
jshEventCallbacks[i-EV_EXTI0] = 0;
}
/** Reset any devices that could have been set up differently by JS code.
* Called from jshReset */
void jshResetDevices() {
unsigned int i;
// Reset list of pins that were set manually
jshResetPinStateIsManual();
// setup flow control
for (i=0;i<sizeof(jshSerialDeviceStates) / sizeof(JshSerialDeviceState);i++)
jshSerialDeviceStates[i] = SDS_NONE;
jshSerialDeviceStates[TO_SERIAL_DEVICE_STATE(EV_USBSERIAL)] = SDS_FLOW_CONTROL_XON_XOFF;
// set up callbacks for events
for (i=EV_EXTI0;i<=EV_EXTI_MAX;i++)
jshEventCallbacks[i-EV_EXTI0] = 0;
}
/** Reset any devices that could have been set up differently by JS code.
* Called from jshReset */
void jshResetDevices() {
unsigned int i;
// Reset list of pins that were set manually
jshResetPinStateIsManual();
// setup flow control
for (i=0;i<sizeof(jshSerialDeviceStates) / sizeof(JshSerialDeviceState);i++)
jshSerialDeviceStates[i] = SDS_NONE;
jshSerialDeviceStates[TO_SERIAL_DEVICE_STATE(EV_USBSERIAL)] = SDS_FLOW_CONTROL_XON_XOFF;
// reset callbacks for events
for (i=EV_EXTI0;i<=EV_EXTI_MAX;i++)
jshEventCallbacks[i-EV_EXTI0] = 0;
// Reset pin state for button
#ifdef BTN1_PININDEX
#ifdef BTN1_PINSTATE
jshSetPinStateIsManual(BTN1_PININDEX, true); // so subsequent reads don't overwrite the state
jshPinSetState(BTN1_PININDEX, BTN1_PINSTATE);
#else
jshPinSetState(BTN1_PININDEX, JSHPINSTATE_GPIO_IN);
#endif
#endif
}
