microblaze访问LMB和AXI BRAM Controller
BD图如下：#include "xparameters.h"
#include "xbram.h"
#include <stdio.h>
/************************** Constant Definitions *****************************/
/*
* The following constants map to the XPAR parameters created in the
* xparameters.h file. They are defined here such that a user can easily
* change all the needed parameters in one place.
*/
#define BRAM_DEVICE_ID XPAR_BRAM_0_DEVICE_ID
#define LMB_DEVICE_ID XPAR_LMB_BRAM_IF_CNTLR_0_DEVICE_ID
/************************** Function Prototypes ******************************/
int BramExample(u16 DeviceId);
static void InitializeECC(XBram_Config *ConfigPtr, u32 EffectiveAddr);
/************************** Variable Definitions *****************************/
/*
* The following are declared globally so they are zeroed and so they are
* easily accessible from a debugger
*/
XBram Bram; /* The Instance of the BRAM Driver */
XBram lmbBram;
/****************************************************************************/
/**
*
* This function is the main function of the BRAM example.
*
* @param None.
*
* @return
* - XST_SUCCESS to indicate success.
* - XST_FAILURE to indicate failure.
*
* @note None.
*
*****************************************************************************/
#ifndef TESTAPP_GEN
int main(void)
{
int Status;
Status = BramExample(BRAM_DEVICE_ID);
if (Status != XST_SUCCESS ) {
xil_printf("Bram Example Failed\r\n");
return XST_FAILURE;
}
xil_printf("Successfully ran Bram Example\r\n");
return XST_SUCCESS;
}
#endif
/*****************************************************************************/
/**
*
* This is the entry point for the BRAM example.
*
* @param DeviceId is the XPAR_<BRAM_instance>_DEVICE_ID value from
* xparameters.h
*
* @return
* - XST_SUCCESS to indicate success.
* - XST_FAILURE to indicate failure.
*
* @note None.
*
******************************************************************************/
int BramExample(u16 DeviceId)
{
int Status;
XBram_Config *ConfigPtr;
/*
* Initialize the BRAM driver. If an error occurs then exit
*/
/*
* Lookup configuration data in the device configuration table.
* Use this configuration info down below when initializing this
* driver.
*/
ConfigPtr = XBram_LookupConfig(DeviceId);
if (ConfigPtr == (XBram_Config *) NULL) {
return XST_FAILURE;
}
Status = XBram_CfgInitialize(&Bram, ConfigPtr,
ConfigPtr->CtrlBaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
InitializeECC(ConfigPtr, ConfigPtr->CtrlBaseAddress);
/*
* Execute the BRAM driver selftest.
*/
Status = XBram_SelfTest(&Bram, 0);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/********joe code start****************/
XBram_Out8(ConfigPtr->MemBaseAddress,(u8)0x36);
volatile u8 data = XBram_In8(ConfigPtr->MemBaseAddress);
XBram_Out8(ConfigPtr->MemBaseAddress,(u8)0x37);
volatile u8 data2 = XBram_In8(ConfigPtr->MemBaseAddress);
// if(data != data2)
// {
// return XST_SUCCESS;
// }
// else
// {
// return XST_FAILURE;
// }
XBram_Config *lmbConfigPtr;
lmbConfigPtr = XBram_LookupConfig(LMB_DEVICE_ID);
if (lmbConfigPtr == (XBram_Config *) NULL) {
return XST_FAILURE;
}
Status = XBram_CfgInitialize(&lmbBram, lmbConfigPtr,
lmbConfigPtr->CtrlBaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
InitializeECC(lmbConfigPtr, lmbConfigPtr->CtrlBaseAddress);
// XBram_Out8(lmbConfigPtr->MemBaseAddress,(u8)0x36);
data2 = XBram_In8(lmbConfigPtr->MemBaseAddress);
XBram_Out8(lmbConfigPtr->MemBaseAddress,(u8)0x37);
data = XBram_In8(lmbConfigPtr->MemBaseAddress);
if(data != data2)
{
return XST_SUCCESS;
}
else
{
return XST_FAILURE;
}
/********joe code end****************/
return XST_SUCCESS;
}
/****************************************************************************/
/**
*
* This function ensures that ECC in the BRAM is initialized if no hardware
* initialization is available. The ECC bits are initialized by reading and
* writing data in the memory. This code is not optimized to only read data
* in initialized sections of the BRAM.
*
* @param ConfigPtr is a reference to a structure containing information
* about a specific BRAM device.
* @param EffectiveAddr is the device base address in the virtual memory
* address space.
*
* @return
* None
*
* @note None.
*
*****************************************************************************/
void InitializeECC(XBram_Config *ConfigPtr, u32 EffectiveAddr)
{
u32 Addr;
volatile u32 Data;
if (ConfigPtr->EccPresent &&
ConfigPtr->EccOnOffRegister &&
ConfigPtr->EccOnOffResetValue == 0 &&
ConfigPtr->WriteAccess != 0) {
for (Addr = ConfigPtr->MemBaseAddress;
Addr < ConfigPtr->MemHighAddress; Addr+=4) {
Data = XBram_In32(Addr);
XBram_Out32(Addr, Data);
}
XBram_WriteReg(EffectiveAddr, XBRAM_ECC_ON_OFF_OFFSET, 1);
}
}LMB和axi bram controller都可以访问到各自对应的BRAM中的数据，实验成功。
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