Learn how to rapidly prototype an embedded system using the Spartan-7 FPGA SP701 evaluation kit. , This video demonstrates how to put together a MicroBlaze design and run "Hello World” using the Vivado Design Suite and Vitis Unified Software Platform, as well as a simple Pulse Width Modulation (PWM) application commonly used in controlling the speed of motors, the brightness of lights, and creating efficient power supplies.
The demonstration video will cover two quick examples of how to build a system from scratch. The first is a Hello World example using MicroBlaze and the second is the PWM application example.
Expand the following section to view the source code for the PWM demo
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/* Include Header Files and Packages */
#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "xtmrctr.h"
/* Device IDs Definition */
#define GpioLed XPAR_AXI_GPIO_0_DEVICE_ID
#define TMRCTR_ID XPAR_TMRCTR_0_DEVICE_ID
#define UARTBaseAddress XPAR_AXI_UARTLITE_0_BASEADDR
/* System clock is 100 MHz (10ns) */
u32 PwmPeriod = 1000; /* Set PwmPeriod to 1000 ns */
u32 PwmHighTime;
u8 DutyCycle;
XTmrCtr TimerDriver; /* Instance of the Timer driver */
int main()
{
u32 Status;
u8 DutyCyclePercentage;
init_platform();
print("PWM Test Successfully Started\n\r");
/* Initializing the Timer where TimerDriver is a pointer to the XTmrCtr instance and TMRCTR_ID is the Device ID */
Status = XTmrCtr_Initialize(&TimerDriver,TMRCTR_ID);
if (Status != XST_SUCCESS) {
xil_printf("Timer Initialization Failed\r\n");
return XST_FAILURE;
}
while (1) {
xil_printf ("Enter Duty Cycle in Bytes: \n\r");
/* UART-Lite Function used to capture the user input (Enter 1 for 10% DC, 2 for 20% DC, etc.)*/
DutyCycle = XUartLite_RecvByte(UARTBaseAddress);
/* Since Key strokes are represented in decimal we want to know the
corresponding pressed key hence convert Duty Cycle Decimal to ASCII */
DutyCyclePercentage = (DutyCycle - '0')*10;
PwmHighTime = DutyCyclePercentage * 10;
xil_printf("Duty Cycle is now: %d \n\r" , DutyCyclePercentage);
/* Pwm Configuration */
XTmrCtr_PwmDisable(&TimerDriver);
XTmrCtr_PwmConfigure(&TimerDriver, PwmPeriod, PwmHighTime);
XTmrCtr_PwmEnable(&TimerDriver);
}
cleanup_platform();
return 0;
}