Test an spi slave module

hello, im an ecuadorian student, sorry for my english causereally i speak spanish, i need help in how to test an spi module configurated like a slave in a DE0nano, i want to read the data that a master sends , the data is of 8 bits, it sends continuously data of 8 bits, the master is outside the DE0 nano, coul you help with a code that let me to receive data of 8 bits??Im need to programm it in Nios II ide 12.1 thanks for your attention