Please open arch/xtensa/src/esp32/esp32_serial.c and search for uart_register() function. Notice that it is wrapped by some #ifdef, that need to be satisfied to that function be called.
Also if you enter inside boards/xtensa and "git grep UART1" or UART2 you will find some board configuration that uses that port. Compare these config with your config and to see what configuration option you are missing. Any of these two strategies will work to figure out the issue. BR, Alan On 9/18/23, Mike Moretti <nu...@mordent.com.invalid> wrote: > Hi, > > There are a bunch of configuration options for various peripherals, > uart0,1,2, i2c0,1, spi0,1... It appears that enabling say UART1 or > UART2 (and configuring their pins) doesn't actually automatically > register it as a ttyS in /devices. Is there some reason for this? Do I > have to manually register every uart other than uart0/ttyS0 in order to > use it with as a character device via file i/o? This just seems like > some kind of oversight to me. I've seen that if I enable I2C0 it shows > up in /dev as /dev/i2c0. SPI devices don't seem to show up either. I > have SPI2 enabled but see no spi device in /dev at all. I don't see > anything in the documentation about this and am just trying to figure > out what we're expected to do to be able to access these devices. > > Thanks, > -m > > >
