void SMI::opWrite() {
//data=01
digitalWrite (_dataPin, LOW);
clockPulse();
digitalWrite (_dataPin, HIGH);
clockPulse();
}
static uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin)
{
int8_t i;
uint8_t temp;
uint8_t data = 0;
clockPulse(clockPin);
for (i = 7; i >= 0; i--)
{
temp = PINC;
_delay_us(0.2d);
temp &= (1 << dataPin);
temp >>= dataPin;
data |= (temp << i);
// HACK: Contrary to all tutorials and the 4021 chip's data-,
// I seem to have to use two clock pulses instead of one.
// Clearly I have misunderstood something here but this code
// works so I'm going with it!
clockPulse(clockPin);
clockPulse(clockPin);
}
return data;
}
void SMI::opRead() {
//data=10
digitalWrite (_dataPin, HIGH);
clockPulse();
digitalWrite (_dataPin, LOW);
clockPulse();
}
// Private method. Writes pixel data without brightness scaling.
static void raw_write(DotStarObject *self, uint8_t *ptr, uint32_t len) {
if(self->fd >= 0) { // Hardware SPI
xfer[1].tx_buf = (unsigned long)ptr;
xfer[1].len = len;
// All that spi_ioc_transfer struct stuff earlier in
// the code is so we can use this single ioctl to concat
// the header/data/footer into one operation:
(void)ioctl(self->fd, SPI_IOC_MESSAGE(3), xfer);
} else if(self->dataMask) { // Bitbang
unsigned char byte, bit;
*gpioClr = self->dataMask;
for(bit=0; bit<32; bit++) { // Header
clockPulse(self->clockMask);
}
while(len--) {
byte = *ptr++;
for(bit = 0x80; bit; bit >>= 1) {
if(byte & bit) *gpioSet = self->dataMask;
else *gpioClr = self->dataMask;
clockPulse(self->clockMask);
}
}
*gpioClr = self->dataMask;
for(bit=0; bit<32; bit++) { // Footer
clockPulse(self->clockMask);
}
}
// Preamble + SFD
void SMI::start() {
//Preamble
digitalWrite (_dataPin, HIGH);
for (int smi_i=0; smi_i<32; smi_i++) {
clockPulse();
}
//SFD
digitalWrite (_dataPin, LOW);
clockPulse();
digitalWrite (_dataPin, HIGH);
clockPulse();
}
// Send register address
void SMI::putAddress(byte HB, byte LB) {
int smi_i;
for (smi_i=1; smi_i>=0; smi_i--){
if ((HB &(1<<smi_i))==0) {
digitalWrite (_dataPin, LOW);
} else {
digitalWrite (_dataPin, HIGH);
}
clockPulse();
}
for (smi_i=7; smi_i>=0; smi_i--){
if ((LB &(1<<smi_i))==0) {
digitalWrite (_dataPin, LOW);
} else {
digitalWrite (_dataPin, HIGH);
}
clockPulse();
}
}
void SMI::sendData(byte target[], int arraySize) {
int smi_i, smi_j;
for (smi_j=0; smi_j<arraySize; smi_j++) {
for (smi_i=7; smi_i>=0; smi_i--) {
if ((target[smi_j] & (1<<smi_i))==0) {
digitalWrite (_dataPin, LOW);
} else {
digitalWrite (_dataPin, HIGH);
}
clockPulse();
}
}
}
int QEncoder::getSample()
{
quint16 sample=0;
interrupts(0);
m_gpio.bitSet (m_bitClock);
for (int n=0;n<13;n++)
{
clockPulse();
int bit = m_gpio.bitValue(m_bitData);
//qDebug() << bit;
sample |= bit;
sample <<=1;
}
interrupts(1);
return sample;
}
void SMI::readTurnA() {
pinMode(_dataPin, INPUT);
clockPulse();
}
void SMI::writeTurnA() {
digitalWrite (_dataPin, HIGH);
clockPulse();
digitalWrite (_dataPin, LOW);
clockPulse();
}
