UART Console

UART0

The UART0 is a debugging console used by ARM, cMep and Syscon. The logic level is 1.8V.

PSTV UART0 location

OLED PSVita UART0 location

There are two ways of using UART0:

• First way is to solder directly to the testpads near the PMIC (yellow and cyan points).

• Second way is through the multi-connector or the testpads above it (blue and red points). To use the multi-connector points though, you need either to tell Syscon to select Kermit UART (procedure currently unknown) or manually flip the switch (green point to 1.8V).

The switch is controlled by a TS3A5018 chip and the RTS gate is a TC7WG126FK chip.

UART1

Development Kit uart input/output.

UART5

The UART5 is a debugging console used for the 3G modem on PS Vita models that have it.

OLED PSVita UART5 location

It is on the PCI-E connector pins 8,10,12,14 is RFR, CTS, TX, RX.

• On 3G PS Vita units, you can solder to the PCI-E connectors or install yifan lu's PSVSD board.
• On Wifi PS Vita units, you need to fill in the 88ohm termination resistors (or just short the pads) and some way to enable it (not known yet).

UART initialization/deinitialization code

scePervasiveUartClockEnableForDriver(port); // Turn on clock
scePervasiveUartResetDisableForDriver(port); // Out of reset
sceUartInitForKernel(port);
/*
 * Use UART port (read/write)
 * ...
 */
scePervasiveUartResetEnableForDriver(port); // Put to reset
scePervasiveUartClockDisableForDriver(port); // Turn off clock

Notes

DevKit

In DevKit units, UART is connected to the Communication Processor. Communication Processor seems to manage input/output from sdio (mini-USB) at regular intervals.