void Swdp::seq_out_parity (uint32_t MS, int ticks) {
uint32_t parity = 0;
turnaround (false);
while (ticks--) {
bit_out (MS & 1);
parity ^= MS;
MS >>= 1;
}
bit_out (parity & 1);
}
void Swdp::seq_out (uint32_t MS, int ticks) {
turnaround (false);
while(ticks--) {
bit_out (MS & 1);
MS >>= 1;
}
}
/********************************************************************
* Function: uint8_t byte_in(uint8_t ack)
*
* Description: This function inputs a byte from the I2C bus.
* Depending on the value of ack, it will also
* transmit either an ACK or a NAK bit.
*******************************************************************/
uint8_t byte_in(uint8_t ack)
{
uint8_t i; // Loop counter
uint8_t retval; // Return value
retval = 0;
for (i = 0; i < 8; i++) // Loop through each bit
{
retval = retval << 1; // Shift left for next bit
bit_in(&retval); // Input bit
}
bit_out(ack); // Output ACK/NAK bit
return retval;
}
/********************************************************************
* Function: uint8_t byte_out(uint8_t data)
*
* Description: This function outputs a byte to the I2C bus.
* It also receives the ACK bit and returns 0 if
* successfully received, or 1 if not.
*******************************************************************/
uint8_t byte_out(uint8_t data)
{
uint8_t i; // Loop counter
uint8_t ack; // ACK bit
ack = 0;
for (i = 0; i < 8; i++) // Loop through each bit
{
bit_out(data); // Output bit
data = data << 1; // Shift left for next bit
}
bit_in(&ack); // Input ACK bit
return ack;
}
void Swdp::reset (void) {
turnaround (false);
/* 50 clocks with TMS high */
for (int i = 0; i < 50; i++) bit_out (true);
}
