Simple question:
How to read/write carambola2 gpio in c?

Mainly the functions I needed for a couple of DHT11 temperature sensors, but it is fast. I've measured pulses to 100ns (~6.666MHz).
So this means i need a memory mapped approach.

More specifically,
I found this function, but have no idea, what addreses should I use.

void writezeros(int n) {
ioctl(fd, GPIO_CLEAR, data_pin); // Data low
// ioctl(3, 0x8b01, 0x7fa04ae0) < should look somewhat like this

// So the question is what these three variables should be for GPIO ports?
}


OR:
I need values for Carabola2 in this library:
https://github.com/dsuarezv/carambola-g ... /libgpio.c
https://github.com/dsuarezv/carambola-g ... /libgpio.h

These values are for Carambola 1 :

#define GPIO_BASE_ADDRESS 0x10000000
#define GPIO_BASE_SIZE 0xFFF
#define GPIO_24_DATA_OFFSET 0x620
#define GPIO_24_DIR_OFFSET 0x624

#define GPIO_MODE_OFFSET 0x60
#define SPI_MODE_MASK 0x02
#define I2C_MODE_MASK 0x01

Does anyone know what values are for carambola2?

Hi denncath,

Register values (addresses) can be found in Atheros AR9311 datasheet

You don't need to read and understand the datasheet. Just the GPIO register section. Anyway if you want an example of memory mapped GPIO control on Carambola2 you can look here https://github.com/8devices/py_mmio