SPI主时钟频率比它应该慢10倍

使用HARMony 2.00b和PIC32MX340F512HAll的配置是使用MHC中的图形“时钟图”来设置的。K＝40MHZSPI1 SCK＝10MHZZ，但取而代之的是，我得到了一个1MHz的SPI时钟。（用TEKTRONIX DPO3034—300 MHz示波器测量）知道我做错了什么吗？



      以下为原文

    Using Harmony 2.00b and a PIC32MX340F512H

All of the configuration is set up using the graphical "Clock Diagram" in MHC.

Configuration bits generated by MHC (from `system_init.c`):
/*** DEVCFG0 ***/

#pragma config DEBUG = OFF
#pragma config ICESEL = ICS_PGx2
#pragma config PWP = OFF
#pragma config BWP = OFF
#pragma config CP = OFF

/*** DEVCFG1 ***/

#pragma config FNOSC = PRIPLL
#pragma config FSOSCEN = OFF
#pragma config IESO = ON
#pragma config POSCMOD = EC
#pragma config OSCIOFNC = ON
#pragma config FPBDIV = DIV_2
#pragma config FCKSM = CSDCMD
#pragma config WDTPS = PS1048576
#pragma config FWDTEN = ON
/*** DEVCFG2 ***/

#pragma config FPLLIDIV = DIV_2
#pragma config FPLLMUL = MUL_20
#pragma config FPLLODIV = DIV_1

And from `system_config.h`:
#define SYS_CLK_FREQ 80000000ul
#define SYS_CLK_BUS_PERIPHERAL_1 40000000ul
#define SYS_CLK_UPLL_BEFORE_DIV2_FREQ 48000000ul
#define SYS_CLK_CONFIG_PRIMARY_XTAL 8000000ul
#define SYS_CLK_CONFIG_SECONDARY_XTAL 32768ul

Then I set up SPI1 (not using the harmony SPI driver):

void spi1_setup() {
   
    // Disable SPI interrupts
    PLIB_INT_SourceDisable(INT_ID_0, INT_SOURCE_SPI_1_ERROR);
    PLIB_INT_SourceDisable(INT_ID_0, INT_SOURCE_SPI_1_RECEIVE);
    PLIB_INT_SourceDisable(INT_ID_0, INT_SOURCE_SPI_1_TRANSMIT);
   
    PLIB_SPI_Disable(SPI_ID_1);
    PLIB_SPI_BufferClear(SPI_ID_1);
   
    // Set SPI interrupt priorities
    PLIB_INT_VectorPrioritySet(INT_ID_0, INT_VECTOR_SPI1, INT_PRIORITY_LEVEL1);
    PLIB_INT_VectorSubPrioritySet(INT_ID_0, INT_VECTOR_SPI1, INT_SUBPRIORITY_LEVEL0);
   
    SPI1BRG = 1; // set the baud rate divider FIXME: This is supposed to give us 10MHz SPI, but we only get 1MHz .
    PLIB_SPI_ReceiverOverflowClear(SPI_ID_1);
   
    PLIB_SPI_StopInIdleDisable(SPI_ID_1);
    PLIB_SPI_ClockPolaritySelect(SPI_ID_1, SPI_CLOCK_POLARITY_IDLE_LOW);
    PLIB_SPI_OutputDataPhaseSelect(SPI_ID_1, SPI_OUTPUT_DATA_PHASE_ON_ACTIVE_TO_IDLE_CLOCK);
    PLIB_SPI_InputSamplePhaseSelect(SPI_ID_1, SPI_INPUT_SAMPLING_PHASE_IN_MIDDLE);
    PLIB_SPI_CommunicationWidthSelect(SPI_ID_1, SPI_COMMUNICATION_WIDTH_8BITS);
    PLIB_SPI_FramedCommunicationDisable(SPI_ID_1);
    PLIB_SPI_MasterEnable(SPI_ID_1);
   
    PLIB_SPI_Enable(SPI_ID_1);
   
    // DMA interrupt priorities
    SYS_INT_VectorPrioritySet(INT_VECTOR_DMA3, INT_PRIORITY_LEVEL1);
    SYS_INT_VectorSubprioritySet(INT_VECTOR_DMA3, INT_SUBPRIORITY_LEVEL0);
   
    PLIB_DMA_Enable(DMA_ID_0);
   
    // RX DMA configuration
    PLIB_DMA_ChannelXSourceStartAddressSet(DMA_ID_0, DMA_CHANNEL_3, (uint32_t) &SPI1BUF);
    PLIB_DMA_ChannelXSourceSizeSet(DMA_ID_0, DMA_CHANNEL_3, 1);
    PLIB_DMA_ChannelXCellSizeSet(DMA_ID_0, DMA_CHANNEL_3, 1);
    PLIB_DMA_ChannelXStartIRQSet(DMA_ID_0, DMA_CHANNEL_3, DMA_TRIGGER_SPI_1_RECEIVE);
   
    // TX DMA configuration
    PLIB_DMA_ChannelXDestinationStartAddressSet(DMA_ID_0, DMA_CHANNEL_2, (uint32_t) &SPI1BUF);
    PLIB_DMA_ChannelXDestinationSizeSet(DMA_ID_0, DMA_CHANNEL_2, 1);
    PLIB_DMA_ChannelXCellSizeSet(DMA_ID_0, DMA_CHANNEL_2, 1);
    PLIB_DMA_ChannelXStartIRQSet(DMA_ID_0, DMA_CHANNEL_2, DMA_TRIGGER_SPI_1_TRANSMIT);
   
}

This should result in:

• SYSCLK = 80MHz
• PBCLK = 40MHz
• SPI1 SCK = 10MHz
  

But instead, I get a SPI clock of 1MHz. (Measured using Tektronix DPO3034 300MHz oscilloscope)

Any idea what I am doing wrong?