Hello All, There is a necessity to connect the 16 bit SPI DAC to the SPORT on the ADSP BF531 (silicon rev. 0.3). I am initializing the SPORT in the prescribed manner: TCLKDIV = 2 TFSDIV = 31 // just in case TCR2 = 0x000F; // word length - 1 TCR1 = 0x7603; // alt. framing mode The SPORT is supposed to work like the SPI: a write to the TX register should generate the SPI cycle. However nothing happens. The clocks are generated at all time (like it supposed to be), the TFS and data are staying inactive. The other modes of the SPORT seem to work right. Am I doing something wrong? Or is it another bug in the silicon? Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
BlackFin BF531 SPORT as SPI
Started by ●October 7, 2006
Reply by ●October 8, 20062006-10-08
hi Vladimir Contact - msn.cps@gmail.com for some interesting in DSP Professional. Please contact. MSCPS Vladimir Vassilevsky wrote:> Hello All, > > There is a necessity to connect the 16 bit SPI DAC to the SPORT on the > ADSP BF531 (silicon rev. 0.3). I am initializing the SPORT in the > prescribed manner: > > TCLKDIV = 2 > TFSDIV = 31 // just in case > TCR2 = 0x000F; // word length - 1 > TCR1 = 0x7603; // alt. framing mode > > The SPORT is supposed to work like the SPI: a write to the TX register > should generate the SPI cycle. However nothing happens. The clocks are > generated at all time (like it supposed to be), the TFS and data are > staying inactive. The other modes of the SPORT seem to work right. > > Am I doing something wrong? Or is it another bug in the silicon? > > Vladimir Vassilevsky > > DSP and Mixed Signal Design Consultant > > http://www.abvolt.com
Reply by ●October 8, 20062006-10-08
Vladimir Vassilevsky wrote:> Hello All, > > There is a necessity to connect the 16 bit SPI DAC to the SPORT on the > ADSP BF531 (silicon rev. 0.3). I am initializing the SPORT in the > prescribed manner: > > TCLKDIV = 2 > TFSDIV = 31 // just in case > TCR2 = 0x000F; // word length - 1 > TCR1 = 0x7603; // alt. framing mode > > The SPORT is supposed to work like the SPI: a write to the TX register > should generate the SPI cycle. However nothing happens. The clocks are > generated at all time (like it supposed to be), the TFS and data are > staying inactive. The other modes of the SPORT seem to work right. > > Am I doing something wrong? Or is it another bug in the silicon? > > Vladimir Vassilevsky > > DSP and Mixed Signal Design Consultant > > http://www.abvolt.comYour register settings seem ok. When you're setting TCR1, you know you need to write the register twice, once with TSPEN 0, then the 2nd time with TSPEN set to 1, right? Otherwise the bits don't necessarily "take". TCR1 = 0x7602; TCR1 = 0x7603; // this turns it on -Dave -- David Ashley http://www.xdr.com/dash Embedded linux, device drivers, system architecture