SPI issues on LM4F120H5QR in Energia - TivaC/CC3XXX Posted May 26, 2016 Hi, A few words about your problem: 1) since you need a sd-card example, maybe the best way is to download the Tiva package from TI - there is an example which run on CCS (and i suggest to move to CCS, since the Energia does not have a debugger, AFAIK). The sd-card configuration starts by sending some data at the rate of 400KHz, in SPI mode 0, toggling CS on every byte. Then after that, when the communication is established, the frequency is changed to 12MHz. 2) since you made some test on another device type (and function) - many devices uses mode 0 and mode 3 or mode 1 and mode 3, so you can check also the SPI MODE 3, which is recognised to keep CS low until you finish sending a burst of data. Keep in mind you need to read each data after sending one - this is SPI nature, there are two synchronous shifting register under the same clock, connected as a ring, so two data are moved at once.