Connect i2c to GPIO12/13/14

[pbanasik]

Hello,

The driver works fine when using GPIO0 and GPIO2 pins. However, I'd like to use it with the bmp sensor connected to GPIO12/13/14. I've tried different combinations: SDA connected to GPIO 12 & SCL to GPIO 13, SDA to 13 & SCL to 12, SDA to 0 & SCL to 12 and a lot of other combinations. I'm getting either the "BMP180: wanted chip id 0x55, found chip id 0x0" or "slave not ACK" message. The only combinations that work for me are: SDA to 0 & SCL to 2 or vice versa.

Example definitions that I'm using:

define PERIPHS_IO_MUX_GPIO13_U (PERIPHS_IO_MUX + 0x08)

// SDA on GPIO13

define I2C_SDA_MUX PERIPHS_IO_MUX_GPIO13_U

define I2C_SDA_FUNC FUNC_GPIO13

define I2C_SDA_PIN 13

//SCK on GPIO12

define I2C_SCK_MUX PERIPHS_IO_MUX_GPIO12_U

define I2C_SCK_PIN 12

define I2C_SCK_FUNC FUNC_GPIO12

I'm using the ESP-03. Would you have any idea why only pins 0 and 2 work? Are GPIO 12-14 different in any way? How would you try to troubleshoot the problem?

Many thanks in advance,
Regards,
Paweł