Hello,
So I've been working with the MSP432E401Y's spimaster example with SDK v3.3. The external ADC I'm using needs a high SCK Frequency (ideally at 85 MHz). But, the MSP432's documented maximum rate of 60 MHz would work too (unless there's a way to go higher than that). I'm setting the bitRate to be 60 MHz, but it somehow maxed out at 10 MHz when I looked at it on a logic analyzer. How would I configure it to get a larger frequency?
My setup:
/* Open SPI as master (default) */
spiParams.frameFormat = SPI_POL0_PHA1;
spiParams.bitRate = 60000000;
spiParams.mode = SPI_MASTER;
spiParams.dataSize = 12;
spiParams.transferMode = SPI_MODE_BLOCKING;
masterSpi = SPI_open(CONFIG_SPI_MASTER, &spiParams);
if (masterSpi == NULL) {
Display_printf(display, 0, 0, "Error initializing master SPI\n");
while (1);
}
else {
Display_printf(display, 0, 0, "Master SPI initialized\n");
}
Documentation Showing that I can supply up to 60 MHz:
typedef struct {
SPI_TransferMode transferMode; /*!< Blocking or Callback mode */
uint32_t transferTimeout; /*!< Transfer timeout in system
ticks */
SPI_CallbackFxn transferCallbackFxn;/*!< Callback function pointer */
SPI_Mode mode; /*!< Master or Slave mode */
/*! @brief SPI bit rate in Hz
*
* Maximum bit rates supported by hardware:
* Device Family | Slave Max (MHz) | Master Max (MHz) |
* ------------- | ------------------ | ---------------- |
* MSP432P4 | 16 MHz | 24 MHz |
* MSP432E4 | 10 MHz | 60 MHz |
* CC13XX/CC26XX | 4 MHz | 12 MHz |
* CC32XX | 20 MHz | 20 MHz |
*
* Please note that depending on the specific use case, the driver may not
* support the hardware's maximum bit rate.
*/
uint32_t bitRate;
uint32_t dataSize; /*!< SPI data frame size in bits */
SPI_FrameFormat frameFormat; /*!< SPI frame format */
void *custom; /*!< Custom argument used by driver
implementation */
} SPI_Params;
Logic Analyzer Output:
