Hi,
I have implemented an AXI timer into a design with the intention of using it to generate a pulse on a specific pin on the Zedboard. I have some issues with the generateout1 not outputting a pulse when the timer reaches zero and reloads.
I have created a separate new design with just the timer and the code I am using. I have checked the register sheets for the values to set and the counter is actually counting down then issuing an interrupt which I can see on the console output. The issue is that I cannot see a pulse on the physical pin on the zedboard. I have even tried a number of different pin mappings. Have I missed something in my design?
not sure how I can get the Block design in the post, but it is pretty much hooked up as standard. The C code for the setup and running is below.
p.s I am using the Timer1 in the separate test design, I was using timer0 in my other design, hence the references to the 0 registers, but I have added the offset to the base address etc for this.
Constraints file is:
set_property PACKAGE_PIN W12 [get_ports {generateout1}]
set_property PULLUP true [get_ports {generateout1}]
set_property IOSTANDARD LVCMOS33 [get_ports {generateout1}]
Thanks
James
#include <stdio.h>
#include "xparameters.h"
#include "xtmrctr.h"
#include "xscugic.h"
XScuGic InterruptController;
static unsigned int tmpreg;
static XScuGic_Config *IntcConfig;
void TimerInterruptHandler(void)
{
tu32 tmpreg;
t//TMCSR.T0INT = 1 - Clear the interrupt
ttmpreg = Xil_In32(XPAR_AXI_TIMER_0_BASEADDR + 0x10);
txil_printf("Read INTR Reg : %x r
",tmpreg);
ttmpreg = tmpreg | 0x100;
tXil_Out32(XPAR_AXI_TIMER_0_BASEADDR + 0x10,tmpreg);
txil_printf("Clear INTR Reg Bit : %x r
",tmpreg);
ttmpreg = Xil_In32(XPAR_AXI_TIMER_0_BASEADDR + 0x10);
txil_printf("Final Value of Register after Interrupt : %x r
",tmpreg);
}
int InterruptSystemSetup(XScuGic *XScuGicInstancePtr)
{
tXil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,(Xil_ExceptionHandler)XScuGic_InterruptHandler,XScuGicInstancePtr);
tXil_ExceptionEnable();
treturn XST_SUCCESS;
}
int IntcInitFunction(u16 DeviceId)
{
tint status;
ttt// Interrupt controller initialisation
tttIntcConfig = XScuGic_LookupConfig(DeviceId);
tttstatus = XScuGic_CfgInitialize(&InterruptController, IntcConfig, IntcConfig->CpuBaseAddress);
tttif(status != XST_SUCCESS) return XST_FAILURE;
ttt// Call to interrupt setup
tttstatus = InterruptSystemSetup(&InterruptController);
tttif(status != XST_SUCCESS) return XST_FAILURE;
ttt// Connect timer interrupt to handler
tttstatus = XScuGic_Connect(&InterruptController,
tttttttttttt 61,
tttttttttttt (Xil_ExceptionHandler)TimerInterruptHandler,
tttttttttttt NULL);
tttif(status != XST_SUCCESS) return XST_FAILURE;
tttXScuGic_Enable(&InterruptController, 61);
tttreturn XST_SUCCESS;
}
int main()
{
t //----------------------------------------------------
t // SETUP THE TIMER
//----------------------------------------------------
t//TCSR0.ENIT0t=t1t- Enable the interrupt
t//TCSR0.GENT0t=t1t- Enable the Generate Output
t//TCSR0.UDT0t=t1t- Set Down Counter
t//TCSR0.MDT0t=t0t- Set Timer to Generate
tunsigned int tmrval;
ttmpreg = Xil_In32(XPAR_AXI_TIMER_0_BASEADDR + 0x10);
txil_printf("Setup : Read Reg : %x r
",tmpreg);
ttmpreg = tmpreg | 0x56;
tXil_Out32(XPAR_AXI_TIMER_0_BASEADDR + 0x10, tmpreg);
txil_printf("Setup : Setup REG Bits : %x r
",tmpreg);
tIntcInitFunction(XPAR_TMRCTR_0_DEVICE_ID);
t//Load Value into TLRO
ttmrval = 0x495C0C6;
tXil_Out32(XPAR_AXI_TIMER_0_BASEADDR + 0x14, tmrval);
t//TCSR0.LOAD0t=t1t- Set the load bit to load TCR0 with TCLR
ttmpreg = Xil_In32(XPAR_AXI_TIMER_0_BASEADDR + 0x10);
txil_printf("Setup : Read reg : %x r
",tmpreg);
ttmpreg = tmpreg | 0x20;
tXil_Out32(XPAR_AXI_TIMER_0_BASEADDR + 0x10, tmpreg);
txil_printf("Setup : Enable load bit : %x r
",tmpreg);
t//TCSR0.LOADt=t0t- Set the load bit to clear the LOAD register
t//TCSR0.ENT0t=t1t- Enable the timer.
ttmpreg = tmpreg ^ 0xA0;
tXil_Out32(XPAR_AXI_TIMER_0_BASEADDR + 0x10, tmpreg);
txil_printf("Setup : Clear Load Bit Set ENB Bit : %x r
",tmpreg);
t//Set up interrupt handler for Timer
tIntcInitFunction(XPAR_TMRCTR_0_DEVICE_ID);
txil_printf("Finished Setupr
");
twhile(1);
return 0;
}
