Updated spi_tester.c

spi_tester.c

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/*
 * spi_tester.c: Will test send/receive functions of SPI module
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */
#define SPI_DEVICE_ID		XPAR_SPI_0_DEVICE_ID
#define GPIO_DEVICE_ID 		XPAR_AXI_GPIO_0_DEVICE_ID
#define LED_CHANNEL			0x1

#include <stdio.h>
#include "platform.h"
#include "xparameters.h"
#include "xspi.h"
#include "xgpio.h"

static XSpi SpiInstance;
static XGpio GpioInstance;

int init_spi(XSpi *SpiInstancePtr);
void spi_write(XSpi *SpiInstancePtr, u8 addr, u8 value);
u8 spi_read(XSpi *SpiInstancePtr, u8 addr);
int init_gpio(XGpio *GpioInstancePtr);
void delay(int n);

int main()
{
	//This is all initialization code, you don't need to modify this
    init_platform();
    init_spi(&SpiInstance);
    init_gpio(&GpioInstance);

    u8 LED_data = 0x1;
    XGpio_DiscreteWrite(&GpioInstance, LED_CHANNEL, LED_data);

    LED_data |= 0x1<<1;
    XGpio_DiscreteWrite(&GpioInstance, LED_CHANNEL, LED_data);

    //TODO: Create better tests below
    /*The current test writes the value 10 to address 0 by writing over SPI
    then checks to see what it gets from address 0 by reading over SPI.*/
    int addr = 0;
    int value = 10;
	spi_write(&SpiInstance, addr, value); //spi_write needs to be filled in
	u8 res = spi_read(&SpiInstance, addr); //spi_read has been provided

	if (res != value) {
	    LED_data |= 0x1<<2;
	    XGpio_DiscreteWrite(&GpioInstance, LED_CHANNEL, LED_data);
	    //You need to insert a breakpoint here to check the variables if your tester breaks.
	    return 0;
	}

    //Everything below is cleanup code, you don't need to modify this
    XGpio_DiscreteWrite(&GpioInstance, LED_CHANNEL, LED_data);
    LED_data |= 0x1<<3;
    XGpio_DiscreteWrite(&GpioInstance, LED_CHANNEL, LED_data);
    cleanup_platform();
    return 0;
}

void spi_write(XSpi *SpiInstancePtr, u8 addr, u8 value){
	// TODO: Your code here! Read the xspi.h file for more information on XSpi_Transfer()
}

u8 spi_read(XSpi *SpiInstancePtr, u8 addr){
	/*SpiInstancePtr is the pointer to the SPI protocol object we created
	 * during the beginning lines of main()*/
	u8 addr_byte = (addr << 1); //Shifted, because we have 7 bits of addr, 1 bit of R/W
	addr_byte |= 0x1;
	u8 RcvBuf[2];
	u8 SendBuf[2];
	SendBuf[0] = addr_byte;
	SendBuf[1] = 0;	//2nd byte is 0, because we're reading data
	XSpi_Transfer(SpiInstancePtr, SendBuf, RcvBuf, 2); //The 2 is the # of expected bytes returned
	return RcvBuf[1]; //1st byte of RcvBuf is garbage (from when the addr was shifted in), 2nd byte is data
}

int init_gpio(XGpio *GpioInstancePtr){
	int Status;
	Status = XGpio_Initialize(GpioInstancePtr, GPIO_DEVICE_ID);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	XGpio_SetDataDirection(GpioInstancePtr, LED_CHANNEL, 0x0);
	return XST_SUCCESS;
}

int init_spi(XSpi *SpiInstancePtr){
	int Status;
	XSpi_Config *ConfigPtr;	/* Pointer to Configuration data */

	ConfigPtr = XSpi_LookupConfig(SPI_DEVICE_ID);
	if (ConfigPtr == NULL) {
		return XST_DEVICE_NOT_FOUND;
	}
	Status = XSpi_CfgInitialize(SpiInstancePtr, ConfigPtr,
				  ConfigPtr->BaseAddress);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	Status = XSpi_SelfTest(SpiInstancePtr);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	if (SpiInstancePtr->SpiMode != XSP_STANDARD_MODE) {
		return XST_SUCCESS;
	}
	Status = XSpi_SetOptions(SpiInstancePtr, XSP_MASTER_OPTION);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	XSpi_Start(SpiInstancePtr);
	XSpi_IntrGlobalDisable(SpiInstancePtr);
	return XST_SUCCESS;
}

void delay(int n){
	int i;
	volatile int k;
	for(i = 0; i < n; i++){
		k++;
	}
}