/** Find the common SERCOM shared by two pins
*
* Finds the common SERCOM index of two input pins.
* If swapping the input argument gives different result, it means, two SERCOMs share both pins
* @param[in] pin1 First pin
* @param[in] pin2 Second pin
* @return SERCOM index if found, else, NC
*/
uint32_t pinmap_merge_sercom(PinName pin1, PinName pin2)
{
int i, j;
uint32_t pin1_sercom[2];
uint32_t pin2_sercom[2];
uint32_t sercom_index[4];
uint32_t pin_com = NC;
uint32_t pin_alt = NC;
uint32_t count_com = 0;
uint32_t count_alt = 0;
/* Adding a condition check just in case we need a different result when swapping arguments */
if (pin1 >= pin2) {
pin1_sercom[0] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PAD);
pin1_sercom[1] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PADEx);
} else {
pin1_sercom[0] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PADEx);
pin1_sercom[1] = pinmap_find_peripheral(pin1, PinMap_SERCOM_PAD);
}
pin2_sercom[0] = pinmap_find_peripheral(pin2, PinMap_SERCOM_PAD);
pin2_sercom[1] = pinmap_find_peripheral(pin2, PinMap_SERCOM_PADEx);
for (i=0; i<2; i++) {
if (pin1_sercom[i] != NC) {
pin1_sercom[i] &= 0x0F;
}
for (j=0; j<2; j++) {
if (pin2_sercom[i] != NC) {
pin2_sercom[i] &= 0x0F;
}
sercom_index[(i*2) + j] = pinmap_merge_pins(pin1_sercom[i], pin2_sercom[j]);
}
}
for (i=0; i<4; i++) {
if (sercom_index[i] != NC) {
if (pin_com == NC) {
pin_com = sercom_index[i];
count_com++;
} else if (pin_com == sercom_index[i]) {
count_com++;
} else if (pin_alt == NC) {
pin_alt = sercom_index[i];
count_alt++;
} else if (pin_alt == sercom_index[i]) {
count_alt++;
} else {}
}
}
return ((count_com >= count_alt) ? pin_com : pin_alt);
}
/** Find the common SERCOM shared by two pins
*
* Finds the common SERCOM index of two input pins.
* Currently uses default pad only
* @param[in] pin1 First pin
* @param[in] pin2 Second pin
* @return SERCOM index if found, else, NC
*/
uint32_t pinmap_merge_sercom(PinName pin1, PinName pin2)
{
uint32_t pin1_sercom, pin2_sercom;
/* Using default pads for now */
pin1_sercom = pinmap_find_peripheral_from_pad(pin1, SERCOM_USE_DEFAULT_PAD);
if (pin1_sercom != (uint32_t)NC) {
pin1_sercom &= 0x0F;
}
pin2_sercom = pinmap_find_peripheral_from_pad(pin2, SERCOM_USE_DEFAULT_PAD);
if (pin2_sercom != (uint32_t)NC) {
pin2_sercom &= 0x0F;
}
return pinmap_merge_pins(pin1_sercom, pin2_sercom);
}
