/*
* @brief blocking call to measure a high or low pulse
* @returns uint32_t pulse width in microseconds up to 3 seconds,
* returns 0 on 3 second timeout error, or invalid pin.
*/
uint32_t HAL_Pulse_In(pin_t pin, uint16_t value)
{
#define pinReadFast(_pin) ((PIN_MAP[_pin].gpio_peripheral->IDR & PIN_MAP[_pin].gpio_pin) == 0 ? 0 : 1)
volatile uint32_t timeoutStart = SYSTEM_TICK_COUNTER; // total 3 seconds for entire function!
/* If already on the value we want to measure, wait for the next one.
* Time out after 3 seconds so we don't block the background tasks
*/
while (pinReadFast(pin) == value) {
if (SYSTEM_TICK_COUNTER - timeoutStart > 216000000UL) {
return 0;
}
}
/* Wait until the start of the pulse.
* Time out after 3 seconds so we don't block the background tasks
*/
while (pinReadFast(pin) != value) {
if (SYSTEM_TICK_COUNTER - timeoutStart > 216000000UL) {
return 0;
}
}
/* Wait until this value changes, this will be our elapsed pulse width.
* Time out after 3 seconds so we don't block the background tasks
*/
volatile uint32_t pulseStart = SYSTEM_TICK_COUNTER;
while (pinReadFast(pin) == value) {
if (SYSTEM_TICK_COUNTER - timeoutStart > 216000000UL) {
return 0;
}
}
return (SYSTEM_TICK_COUNTER - pulseStart)/SYSTEM_US_TICKS;
}
uint8_t RFID::softSPITranser(uint8_t data) {
uint8_t b=0;
for (uint8_t bit = 0; bit < 8; bit++) {
if (data & (1 << (7-bit))) // walks down mask from bit 7 to bit 0
pinSetFast(_mosiPin); // Data High
else
pinResetFast(_mosiPin); // Data Low
pinSetFast(_clockPin); // Clock High
b <<= 1;
if (pinReadFast(_misoPin))
b |= 1;
pinResetFast(_clockPin); // Clock Low
}
return b;
}
uint8_t Sd2Card::sparkSPISend(uint8_t data) {
uint8_t b=0;
if (SPImode_) { // SPI Mode is Hardware so use Spark SPI function
b = SPI.transfer(data);
}
else { // SPI Mode is Software so use bit bang method
for (uint8_t bit = 0; bit < 8; bit++) {
if (data & (1 << (7-bit))) // walks down mask from bit 7 to bit 0
pinSetFast(mosiPin_); // Data High
else
pinResetFast(mosiPin_); // Data Low
pinSetFast(clockPin_); // Clock High
b <<= 1;
if (pinReadFast(misoPin_))
b |= 1;
pinResetFast(clockPin_); // Clock Low
}
}
return b;
}
