I am not seeing anything in the docs about the coding standard used in FreeRtos. I assume the prefixes are along the lines of ‘u’=unsigned,‘s’=signed (or short?),‘p’=ptr … so what is the ‘x’ and ‘v’ prefix supposed to mean?
See http://www.freertos.org/a00017.html#NamingConventions although this is a little old. ‘x’ is also used for variables of type portBASE_TYPE, which is the most efficient type for the architecture, typically char for 8bitters, short for 16bitters and long for 32bitters.