Hello Juan, ----- Original Message ----- From: Juan García Pastor [mailto:jgp@xxxxxxxxxxxxx] To: linux-serial@xxxxxxxxxxxxxxx Sent: Sun, 24 Apr 2016 23:01:33 +0200 Subject: Raspberry compute module does not find ttySC0 and ttySC1 with SC16IS752 > Hi, > > We are integrating the sc16is752 chip with a Raspberry compute module. Our > final objective is to obtain 2 UARTs from the I2C channel provided by the > compute module. > > We are facing difficulties accessing the UARTs from the Compute Module. I > will explain first the electrical lay-out and then the configuration done in > the Compute Module. > > I try to be very clear explaining all what we have done. Some things may be > evident, but I think they will be a good help for anyone dealing with > similar problems. I hope advanced developers will understand. Specific > questions are at the end of the mail. > > The connections diagram is: > Raspberry compute module to SC16IS752 pin connections: > RaspberryPiComputeModule Pin-9 (SDA) to sc16is752 Pin-14 > RaspberryPiComputeModule Pin-11 (SCL) to sc16is752 Pin-13 > > We use pool-up resistances (1.8K) in both signals. Apart from the two I2C connections you will also need an interrupt signal. And this one also requires a pull up. Maarten -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
