Set SPI port baudrates higher than 1M on LaunchPadXL

Bart Roodenburg

Intellectual 300 points

Other Parts Discussed in Thread: TMS320F28027

Hello all,

In the newly distributed TI file f2802x-DRL-UG.pdf there is a function to set the SPI baudrate directly. This is:

SPI_setBaudRate(mySpi, xxx);

Enumerators "xxx":
SPI_BaudRate_500_KBaud
SPI_BaudRate_1_MBaud

I'm now running fine at 1M data rate, however, I'm interested when my build hardware fails by increasing the speed. In SPRUG71B (Enhanced SPI ... pag. 16) it is shown that the speed can be increased further.

What is the best way to do that?

The SW is running on a LaunchPadXL with TMS320F28027 at 60MHz (with external crystal of 20MHz).

Regards, Bart

over 9 years ago

0 Bart Roodenburg over 9 years ago

Intellectual 300 points

If I change line: SPI_setBaudRate(mySpi, SPI_BaudRate_1_MBaud); to
SpiaRegs.SPIBRR = 4; The SPI clock increases to 3.125 MHz.
Is this the way ho to do this? It looks strange to me these syntax combinations...

0 Bart Roodenburg over 9 years ago in reply to Bart Roodenburg

Intellectual 300 points

After some discussion it is better is to change the low speed peripheral clock speed (LSPCLK) and the SPIBRR register as follows:

MOSI (0x3AAA) and CLK data on scope (with protection series resistors of 330R in data lines)

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Set SPI port baudrates higher than 1M on LaunchPadXL