#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_ssi.h"
#include "inc/hw_types.h"
#include "driverlib/ssi.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"

#define NUM_SSI_DATA 8
const uint8_t pui8DataTx[NUM_SSI_DATA] =
{0x88, 0xF8, 0xF8, 0x88, 0x01, 0x1F, 0x1F, 0x01};

// Bit-wise reverses a number.
uint8_t
Reverse(uint8_t ui8Number)
{
	uint8_t ui8Index;
	uint8_t ui8ReversedNumber = 0;
	for(ui8Index=0; ui8Index<8; ui8Index++)
	{
		ui8ReversedNumber = ui8ReversedNumber << 1;
		ui8ReversedNumber |= ((1 << ui8Index) & ui8Number) >> ui8Index;
	}
	return ui8ReversedNumber;
}

int main(void)
{
	uint32_t ui32Index;
	uint32_t ui32Data;

	SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

	SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

	GPIOPinConfigure(GPIO_PA2_SSI0CLK);
	GPIOPinConfigure(GPIO_PA3_SSI0FSS);
	GPIOPinConfigure(GPIO_PA5_SSI0TX);
	GPIOPinTypeSSI(GPIO_PORTA_BASE,GPIO_PIN_5|GPIO_PIN_3|GPIO_PIN_2);

	SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 10000, 16);
	SSIEnable(SSI0_BASE);

	while(1)
	{
		for(ui32Index = 0; ui32Index < NUM_SSI_DATA; ui32Index++)
		{
			ui32Data = (Reverse(pui8DataTx[ui32Index]) << 8) + (1 << ui32Index);
			SSIDataPut(SSI0_BASE, ui32Data);
			while(SSIBusy(SSI0_BASE))
			{
			}
		}

	}

}