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unsigned char dma_buff1 [512];

DMA10CON = 0;
DMA10CONbits.SIZE = 1; // Data Transfer Size bit = byte
DMA10CONbits.DIR = 1; // Transfer Direction bit = Reads from DPSRAM (or RAM) address, writes to peripheral address
DMA10CONbits.MODE = 1; // Register Indirect with Post-Increment Addressing Mode

DMA10STAL = (int)dma_buff1; // Buffer address
DMA10STAH = 0x0000; // Must be set to zero

DMA10PAD = (volatile unsigned int) &SPI1BUF; // SPI 1 buffer address

DMA10CNT = 0x1FF; // count = 511 + 1 = 512

IFS7bits.DMA10IF = 0;// Clear DMA Interrupt Flag
IEC7bits.DMA10IE = 1;// Enable DMA interrupt

DMA10REQ = (volatile unsigned char)0x0A; // SPI 1 transfer complete

DMA10CONbits.CHEN = 1; // enable channel

DMA10REQbits.FORCE = 1; // manual
while (DMA0REQbits.FORCE == 1) {};

SPI1CON1bits.DISSCK = 0; // Internal serial clock is enabled
SPI1CON1bits.DISSDO = 0; // SDOx pin is controlled by the module
SPI1CON1bits.MODE16 = 0; // Communication is byte-wide (8 bits)
SPI1CON1bits.SMP = 0; // Input data is sampled at the middle of data output time
SPI1CON1bits.SSEN = 1;

SPI1CON1bits.CKE = 0; // 0
SPI1CON1bits.CKP = 1; // 1

IFS0bits.SPI1IF = 1; // clear int flag
IEC0bits.SPI1IE = 1; // enable int

// 60 FP / 4 * 4 = 3.75 mHz
SPI1CON1bits.PPRE = 0b01; // primary prescaler = 4
SPI1CON1bits.SPRE = 0b100; // secondary prescaler = 4

// active state is a high-level
SPI1CON1bits.MSTEN = 1; // Master mode enabled
SPI1STATbits.SPIEN = 1; // Enable SPI module

void __attribute__((__interrupt__,no_auto_psv)) _DMA10Interrupt(void)
{
IFS7bits.DMA10IF = 0;// Clear the DMA0 Interrupt Flag}
}

void __attribute__((__interrupt__,no_auto_psv)) _SPI1Interrupt(void)
{
IFS0bits.SPI1IF = 0;
}