Hello, Can someone let me know the method to calculate the baud rate for SPI communication on mini2440? On pg.508 of the user manual the following equation is provided: Baud rate = PCLK / 2 / (Prescaler value + 1) What is the PCLK value? can anyone provide example? Thanks.
PCLK appears to be some ratio of FCLK, which I am assuming is the main clock frequency. Page 7-8 in "S3C2440.pdf", search Google, should provide the details.
Hello, It says that FCLK maximum speed is 400MHZ. However, how can we determine its exact value? Thanks.
Read the cpu datasheet section "Clock and Power Managment".
Check the frequency marked on the (FCLK) crystal.
Sorry, that wasn't too helpful. The crystal is marked 12MHz on the schematic, but as Andreas says the manual "S3C2440.pfd" gives details on the internal PLL that effects the final FCLK.
Hello Andreas and davef, I previously read the Clock and Power management section of the manual but it was confusing for me to get the FCLK value. I will read it again to see specific details. Thanks.
Somehow, you have to figure out what multiply ratio the prescalar uses. I would look around for a configuration file that sets up the prescalar. There is a list of all the drivers in one of the .pdfs on this site. You might be lucky and find something in there.
Hi could i know how i can use the SPI driver allocated in the /sys/class/spi_master and /sys/class/spidev Thanks