Hello
AFAIK on many systems running embedded linux the rule of thumb for knowing which address to use for a certain pin is:
eg. GPIO3_PIN5: (3-1)*32+5 = 69
However by going through the jetson docs I found the following example which doesn’t seem to follow this rule.
const int GPIO_LED = 57; // GPIO_PH1 (Pin 50 on J3A1 of Jetson TK1 board)
gpio_export(GPIO_LED); // Start using the LED pin
gpio_set_dir(GPIO_LED, OUTPUT_PIN); // The LED is an output
if (detections_num > 0) {
gpio_set_value(GPIO_LED, HIGH); // Turn the LED on
}
else {
gpio_set_value(GPIO_LED, LOW); // Turn the LED off
}
gpio_unexport(GPIO_LED); // Stop using the LED pin for now
Could someone explain me eg how they went from physiscal pinnumber 50 to internal linux mapped pin number 57?
I would have expected this (although I am not sure it does make any sense…):
pin bank = H = 8
pin number = 50
formula: (pinbank - 1)* 32 + pinnumber = linux address
(8-1)*32 + 50 = 274
Thanks