I have been using the example in https://github.com/kamejoko80/my_osek/tree/master/NEO_M4_BARE_METAL to set a led on/off. It works, but now i'd like to use a led not in board, but connected as GPIO output in one of the external pins. I see in gpio_pins.c, the board LED is set with this: gpio_config_t gpioLed = { "DEBUG_LED", //name &IOMUXC_SW_MUX_CTL_PAD_NAND_DATA02, // muxReg 5, // GPIO2_IO02 ? &IOMUXC_SW_PAD_CTL_PAD_NAND_DATA02, // padReg IOMUXC_SW_PAD_CTL_PAD_NAND_DATA02_DSE(6)| // padConfig IOMUXC_SW_PAD_CTL_PAD_NAND_DATA02_SPEED(2)| IOMUXC_SW_PAD_CTL_PAD_NAND_DATA02_PKE_MASK, GPIO4, // base 6 // pin }; so I will have to select a new pad name associated with the GPIO I choose and change the struct. The problem is I don't understand the items in red color. According the iMX6SoloX ReferenceManual NAND_DATA02 has as associated GPIO GPIO2_IO02, what means is in GPIO bank 2 , pin 02. So, what is that GPIO4 as base? Shouldn't it be GPIO2?. What is that 6 pin?. Shouldn't be 2? And why GPIO4 base is 0x420A8000U ? Where is all this explained? Thank you
You don't need to change this value as it represent 'ATL5' which is 'GPIO pin muxing'. NAND_DATA02 can be pin mux'd to GPIO4_IO06, hence base is GPIO4 and the actual pin is 6. Each GPIO bank has 32 pins.
Thanks jas-mx for your fast answer But in page 2121 of IMX6DQRM it says for NAND_DATA02, ALT5 function is GPIO2_IO02. GPIO4_IO06 is always associated with KEY_COL0 pad name, so i can't see any relation with it.
You need to refer to the IMX6SXRM (i.MX 6SoloX Applications Processor Reference Manual) not IMX6DQRM .
