MSP432P401R: SPI Bit Rate set to 24M

Gilboa Shveki

Part Number: MSP432P401R

I'm trying to set the SPI bit rate to 24M (or even higher) but SPI init failed, since the clock picked for the SPI is low due to the power level.

How do i set the highest power level (force AWAKE) and make the SPI use higher clock?

The highest that i'm able to set is 6M SPI bit rate, and it is with 12M SMCLK. I saw that with power level 3 I can get higher SMCLK.

LL Flow: in SPIMSP432DMA_open calling PowerMSP432_getFreqs- which is calling Power_getPerformanceLevel()

Level returned is 2, which returnes SMCLK value of 12M.

I see that if i will be able to set the level to 3, the SMCLK will be 24M thus ill be able to set the SPI to higher bit rate

Thanks!

over 6 years ago

0 Priya Thanigai over 6 years ago

TI__Mastermind 26380 points

Hi,
Thanks for posting to the forum.
Let me look into the settings and get back to you.

To double check, I assume you are using the MSP432 SDK with the MSP-EXP432P401R LaunchPad?
Is there a specific example code you are working from as a starting point?

-Priya

0 Gilboa Shveki over 6 years ago in reply to Priya Thanigai

TI__Prodigy 260 points

yes this is the launchpad.

my code is based on the "powerperformance" example code on CCS with ti-rtos

thanks!

0 DavidL over 6 years ago in reply to Gilboa Shveki

TI__Mastermind 25045 points

Hello,

You will have to create a custom performance level. Please take a look at this post:

https://e2e.ti.com/support/microcontrollers/msp430/f/166/p/603334/2220428#2220428

Your "new" performance level should look something like this:

PowerMSP432_PerfLevel myPerfLevels[] =
{
 {
  .activeState = PCM_AM_DCDC_VCORE1,
  .VCORE = 1,
  .clockSource = CS_DCOCLK_SELECT,
  .DCORESEL = CS_DCO_FREQUENCY_48,
  .DIVM = CS_CLOCK_DIVIDER_1,
  .DIVHS = CS_CLOCK_DIVIDER_1,
  .DIVS = CS_CLOCK_DIVIDER_1,
  .flashWaitStates = 1,
  .enableFlashBuffer = true,
  .MCLK = 48000000,
  .HSMCLK = 48000000,
  .SMCLK = 48000000,
  .ACLK = 32768
 },
};

Having said that, the maximum SPI speed that we guarantee is 16Mbps and please keep in mind that we cannot guarantee anything that's not listed in the msp432 datasheet.

Hopefully this helps.

David

0 Gilboa Shveki over 6 years ago in reply to DavidL

TI__Prodigy 260 points

that works perfectly. had to upgrade to latest SDK for this. thanks!

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MSP432P401R: SPI Bit Rate set to 24M