ZYNQ. InterruptSPI.AXI TIMER

Posted 2021-01-23 protogenoi

Shared Peripheral Interrupts (SPI)

SPI 可以接收来自PL的中断，这里使用PL模块 AXI Timer 的中断模式，并连接到CPU。

AXI TIMER

定时器，内部有两个完全相同的TIMER模块。

 

特性：

在手册里可以找到详细的参数和寄存器信息。

 

硬件系统

需要zynq核和一个AXI Timer，PL的clock可以在zynq核内部设置。

 

软件部分

 这里会使用到xilinx提供的函数库

• 中断       xscugic.h
• 定时器　xtmrctr.h

因为使用了PS端的GPIO，所以还需要另一个库

• GPIO      xgpiops.h

大致流程与私有定时器相似：

1. 定义定时器、中断控制器和GPIO的结构体
2. 初始化定时器、终端控制器和GPIO，以及私有定时器自检
3. ARM异常处理初始化，连接系统中断处理程序
4. 连接定时器中断程序
5. 使能GIC、使能定时器中断、使能ARM中断
6. 配置重载、计数器初值，然后开始定时器，等中断
7. 废弃这个定时器，通知处理器、通知GIC废弃

 

code:

//*****************2018/11/27 封装******************

  1 #include <stdio.h>
  2 #include "xil_printf.h"
  3 
  4 #include "xparameters.h"
  5 #include "xgpiops.h"
  6 
  7 #include "sleep.h"
  8 
  9 #include "xtmrctr.h"
 10 #include "xil_exception.h"
 11 #include "xscugic.h"
 12 
 13 #define GpioPsDeviceId         XPAR_PS7_GPIO_0_DEVICE_ID
 14 #define AxiTmrCtrDeviceId     XPAR_TMRCTR_0_DEVICE_ID
 15 #define XScuGic_DEVICE_ID      XPAR_PS7_SCUGIC_0_DEVICE_ID
 16 #define TMRCTR_INTERRUPT_ID    XPAR_FABRIC_AXI_TIMER_0_INTERRUPT_INTR
 17 
 18 #define pinLed1 0
 19 #define pinLed2 9
 20 
 21 #define TIMER_CNTR_0         0
 22 #define RESET_VALUE             0xFFFFFFFF-(0x5F5E100-1) //1s
 23 
 24 int XGpioPsInit(XGpioPs *XGpioPsPtr);
 25 int XIntrSysInit(XTmrCtr *XTmrCtrInstancePtr,
 26         XScuGic *IntcInstancePtr,
 27         u16 DeviceId,
 28         u16 IntrId);
 29 void XTmrCtrIntrHandler(void *CallBackRef, u8 TmrCtrNumber);
 30 void TmrCtrDisableIntr(XScuGic *IntcInstancePtr, u16 IntrId);
 31 
 32 static XGpioPs GpioPs;
 33 static XTmrCtr XTmrCtrInstance;
 34 static XScuGic IntcInstance;
 35 
 36 int valueWriteLed2 = 0x01;
 37 int valueWriteLed1 = 0x00;
 38 
 39 int main()
 40 {
 41     int Status;
 42 
 43     xil_printf("

 Hello,world! 

"
 44             "AXI Timer Test

");
 45 
 46     /* Initialize the Gpio driver */
 47     Status = XGpioPsInit(&GpioPs);
 48     if (Status != XST_SUCCESS) {
 49         xil_printf("GPIOPS Initial Failed
");
 50         return XST_FAILURE;
 51     }
 52 
 53     /* initialize & connect & enable interrupt system  */
 54     Status = XIntrSysInit(&XTmrCtrInstance,
 55                 &IntcInstance,
 56                 AxiTmrCtrDeviceId,
 57                 TMRCTR_INTERRUPT_ID);
 58     if (Status != XST_SUCCESS) {
 59         xil_printf("Interrupt System Initial Failed
");
 60         return XST_FAILURE;
 61     }
 62 
 63     /* set interrupt handler */
 64     XTmrCtr_SetHandler(&XTmrCtrInstance,
 65             XTmrCtrIntrHandler,&XTmrCtrInstance);
 66 
 67     /* Setting the timer counter option
 68      * interrupt Mode and Auto Reload And Up Counter*/
 69     XTmrCtr_SetOptions(&XTmrCtrInstance, TIMER_CNTR_0,
 70             XTC_INT_MODE_OPTION );//| XTC_AUTO_RELOAD_OPTION);
 71 
 72     /* Set a reset value */
 73     XTmrCtr_SetResetValue(&XTmrCtrInstance,
 74             TIMER_CNTR_0, //
 75             RESET_VALUE); //
 76 
 77 
 78     /* Start the timer counter */
 79     XTmrCtr_Start(&XTmrCtrInstance, TIMER_CNTR_0);
 80 
 81     while(1){
 82         XGpioPs_WritePin(&GpioPs, pinLed1, valueWriteLed1);
 83 //        XGpioPs_WritePin(&Gpio, pinLed2, valueWriteLed2);
 84         sleep(1);
 85         xil_printf("--Write Led1: %d--
",valueWriteLed1);
 86 //        xil_printf("--Write Led2: %d--
",valueWriteLed2);
 87         valueWriteLed1 = valueWriteLed1 & (0x01) ?
 88                 0x00 :0x01;//~valueWriteLed1;
 89 //        valueWriteLed2 = valueWriteLed2 & (0x01) ?
 90 //                0x00 :0x01;//~valueWriteLed2;
 91 
 92         xil_printf("
-- Do Again --
");
 93     }
 94 
 95 
 96     /* never reached */
 97     xil_printf("
 test end

");
 98 
 99     /* Disconnect the interrupt */
100     TmrCtrDisableIntr(&IntcInstance, TMRCTR_INTERRUPT_ID);
101 
102     return 0;
103 }
104 
105 /* Initialize the timer And GIC device driver ,
106  * Connect the Interrupt to GIC And Enable the Interrupt */
107 int XIntrSysInit(XTmrCtr *XTmrCtrInstancePtr,XScuGic *IntcInstancePtr,
108         u16 DeviceId, u16 IntrId)
109 {
110     XScuGic_Config *IntcConfig;
111     int Status;
112 
113     /* Initialize the timer counter*/
114     Status = XTmrCtr_Initialize(XTmrCtrInstancePtr, DeviceId);
115     if (Status != XST_SUCCESS) {
116         xil_printf("AXI TIMER INITIAL FAILED! 

");
117         return XST_FAILURE;
118     }
119 
120     /* Initialize the interrupt controller driver */
121     IntcConfig = XScuGic_LookupConfig(XScuGic_DEVICE_ID);
122     if (NULL == IntcConfig) {
123         return XST_FAILURE;
124     }
125     Status = XScuGic_CfgInitialize(IntcInstancePtr, IntcConfig,
126                     IntcConfig->CpuBaseAddress);
127     if (Status != XST_SUCCESS) {
128         return XST_FAILURE;
129     }
130 
131     /* Sets the interrupt priority & trigger type
132      * for the specified IRQ source */
133     XScuGic_SetPriorityTriggerType(IntcInstancePtr, IntrId,
134                         0xA0, 0x3);
135 
136     /* Initialize the exception table. */
137     Xil_ExceptionInit();
138 
139     /* Register the interrupt controller handler with the exception table.     */
140     Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
141                     (Xil_ExceptionHandler)
142                     XScuGic_InterruptHandler,
143                     IntcInstancePtr);
144 
145     /* Connect the interrupt handler  */
146     Status = XScuGic_Connect(&IntcInstance, IntrId,
147                  (Xil_ExceptionHandler)XTmrCtr_InterruptHandler,
148                  XTmrCtrInstancePtr);
149     if (Status != XST_SUCCESS) {
150         return Status;
151     }
152 
153     /* Enable the interrupt for the Timer device. */
154     XScuGic_Enable(IntcInstancePtr, IntrId);
155 
156     /* Enable non-critical exceptions. */
157     Xil_ExceptionEnable();
158 
159 
160     return XST_SUCCESS;
161 }
162 
163 void XTmrCtrIntrHandler(void *CallBackRef, u8 TmrCtrNumber)
164 {
165 //    XTmrCtr *InstancePtr = (XTmrCtr *)CallBackRef;
166 
167     XGpioPs_WritePin(&GpioPs, pinLed2, valueWriteLed2);
168     xil_printf("--Write Led2: %d--
",valueWriteLed2);
169     valueWriteLed2 = valueWriteLed2 & (0x01) ?
170             0x00 :0x01;//~valueWriteLed2;
171     return;
172 }
173 
174 int XGpioPsInit(XGpioPs *GpioPsPtr)
175 {
176     XGpioPs_Config *ConfigPtr;
177 
178     int Status;
179     /* Initialize the Gpio driver. */
180     ConfigPtr = XGpioPs_LookupConfig(GpioPsDeviceId);
181     if (ConfigPtr == NULL) {
182         xil_printf("ERROR
");
183         return XST_FAILURE;
184     }
185     Status = XGpioPs_CfgInitialize(GpioPsPtr,ConfigPtr,
186                                     ConfigPtr->BaseAddr);
187     if (Status != XST_SUCCESS) {
188             print("cfg init err
");
189             return XST_FAILURE;
190     }
191 
192     //set pin direction
193     //value 0 -> input  1 -> output
194     XGpioPs_SetDirectionPin(GpioPsPtr, pinLed1, 1);
195     XGpioPs_SetDirectionPin(GpioPsPtr, pinLed2, 1);
196     //value 0 -> disable   1 -> enable
197     XGpioPs_SetOutputEnablePin(GpioPsPtr, pinLed1, 1);
198     XGpioPs_SetOutputEnablePin(GpioPsPtr, pinLed2, 1);
199 
200     return XST_SUCCESS;
201 }
202 void TmrCtrDisableIntr(XScuGic* IntcInstancePtr, u16 IntrId)
203 {
204     /* Disconnect the interrupt */
205     XScuGic_Disable(IntcInstancePtr, IntrId);
206     XScuGic_Disconnect(IntcInstancePtr, IntrId);
207 
208     return;
209 }

 

 via

https://blog.csdn.net/u014485485/article/details/79069445