请写出一段代码,实现使用裸机实现方式,在zynq中将sd卡中bmp格式的图片存储到ps端的ddr中
时间: 2024-05-06 22:18:21 浏览: 268
由于这是一个比较复杂的任务,我们需要按照以下步骤来实现:
1. 初始化SD卡和DDR存储器;
2. 读取BMP文件头信息,检查文件是否为BMP格式;
3. 读取BMP文件像素数据,并将其存储到DDR中。
下面是具体的代码实现过程:
```c
#include "xil_printf.h"
#include "xil_cache.h"
#include "ff.h"
#include "xparameters.h"
#include "xil_io.h"
#include "xscugic.h"
#include "xil_exception.h"
/* SD卡相关参数 */
#define SD_DEVICE_ID XPAR_XSDPS_0_DEVICE_ID
#define SD_BLOCK_SIZE 512
#define SDHC 0
/* DDR相关参数 */
#define DDR_BASE_ADDR XPAR_PS7_DDR_0_S_AXI_BASEADDR
#define DDR_HIGH_ADDR XPAR_PS7_DDR_0_S_AXI_HIGHADDR
#define DDR_SIZE (DDR_HIGH_ADDR - DDR_BASE_ADDR + 1)
/* BMP格式相关参数 */
#define BMP_HEADER_SIZE 54
#define BMP_WIDTH_OFFSET 18
#define BMP_HEIGHT_OFFSET 22
#define BMP_DATA_OFFSET 54
/* 中断控制器相关参数 */
#define INTC_DEVICE_ID XPAR_SCUGIC_SINGLE_DEVICE_ID
#define INTC XScuGic
#define INTC_HANDLER Xil_ExceptionHandler
/* SD卡读取状态 */
typedef enum {
SD_READ_IDLE,
SD_READ_HEADER,
SD_READ_DATA
} SD_READ_STATE;
/* 中断控制器变量 */
INTC Intc;
volatile int SDReadDone;
/* SD卡变量 */
XSdPs SdInstance;
u8 SdReadBuffer[SD_BLOCK_SIZE];
u32 SdBlocksRead;
SD_READ_STATE SdReadState;
FATFS SdFatFs;
FIL SdFile;
UINT SdBytesRead;
u32 SdFileSize;
u32 SdImageDataOffset;
u32 SdImageWidth;
u32 SdImageHeight;
/* DDR变量 */
u32 *DdrBaseAddr;
/* 中断处理函数 */
static void SdReadDoneHandler(void *CallBackRef)
{
SDReadDone = 1;
}
/* 初始化SD卡 */
static int InitializeSd()
{
int Status;
XSdPs_Config *SdConfig;
/* 初始化SD卡 */
SdConfig = XSdPs_LookupConfig(SD_DEVICE_ID);
if (SdConfig == NULL) {
xil_printf("ERROR: Could not find SD device\n");
return XST_FAILURE;
}
Status = XSdPs_CfgInitialize(&SdInstance, SdConfig, SdConfig->BaseAddress);
if (Status != XST_SUCCESS) {
xil_printf("ERROR: Could not initialize SD card driver\n");
return XST_FAILURE;
}
/* 检查SD卡是否插入 */
if (!XSdPs_IsCardInserted(&SdInstance)) {
xil_printf("ERROR: SD card is not inserted\n");
return XST_FAILURE;
}
/* 检查SD卡是否可用 */
if (!XSdPs_IsCardInitialized(&SdInstance)) {
Status = XSdPs_CardInitialize(&SdInstance);
if (Status != XST_SUCCESS) {
xil_printf("ERROR: Failed to initialize SD card\n");
return XST_FAILURE;
}
}
/* 设置SD卡时钟 */
Status = XSdPs_SdCardConfig(&SdInstance);
if (Status != XST_SUCCESS) {
xil_printf("ERROR: Failed to configure SD card\n");
return XST_FAILURE;
}
/* 设置SD卡块大小 */
XSdPs_SetBlkSize(&SdInstance, SD_BLOCK_SIZE);
return XST_SUCCESS;
}
/* 初始化DDR */
static int InitializeDdr()
{
/* 映射DDR基地址 */
DdrBaseAddr = (u32 *)DDR_BASE_ADDR;
/* 开启DDR缓存 */
Xil_DCacheEnable();
Xil_DCacheFlush();
return XST_SUCCESS;
}
/* 初始化中断控制器 */
static int InitializeIntc()
{
int Status;
/* 初始化中断控制器 */
XScuGic_Config *IntcConfig = XScuGic_LookupConfig(INTC_DEVICE_ID);
Status = XScuGic_CfgInitialize(&Intc, IntcConfig, IntcConfig->CpuBaseAddress);
if (Status != XST_SUCCESS) {
xil_printf("ERROR: Could not initialize interrupt controller\n");
return XST_FAILURE;
}
/* 连接中断处理函数 */
Status = XScuGic_Connect(&Intc, XPAR_XSDPS_0_INTR, (Xil_InterruptHandler)XSdPs_IntrHandler, &SdInstance);
if (Status != XST_SUCCESS) {
xil_printf("ERROR: Could not connect SD card interrupt\n");
return XST_FAILURE;
}
/* 使能中断 */
XScuGic_Enable(&Intc, XPAR_XSDPS_0_INTR);
return XST_SUCCESS;
}
/* 读取SD卡中的BMP图片 */
static int ReadBmpImage()
{
int Status;
FRESULT FatFsResult;
u8 BmpHeader[BMP_HEADER_SIZE];
/* 打开SD卡中的BMP文件 */
FatFsResult = f_open(&SdFile, "image.bmp", FA_READ);
if (FatFsResult != FR_OK) {
xil_printf("ERROR: Could not open BMP file\n");
return XST_FAILURE;
}
/* 读取BMP文件头信息 */
FatFsResult = f_read(&SdFile, BmpHeader, BMP_HEADER_SIZE, &SdBytesRead);
if (FatFsResult != FR_OK || SdBytesRead != BMP_HEADER_SIZE) {
xil_printf("ERROR: Could not read BMP header\n");
return XST_FAILURE;
}
/* 检查文件是否为BMP格式 */
if (BmpHeader[0] != 'B' || BmpHeader[1] != 'M') {
xil_printf("ERROR: File is not in BMP format\n");
return XST_FAILURE;
}
/* 读取像素数据偏移量 */
SdImageDataOffset = *(u32 *)(BmpHeader + 10);
/* 读取图片宽度和高度 */
SdImageWidth = *(u32 *)(BmpHeader + BMP_WIDTH_OFFSET);
SdImageHeight = *(u32 *)(BmpHeader + BMP_HEIGHT_OFFSET);
/* 计算图片大小 */
SdFileSize = f_size(&SdFile);
/* 设置SD卡读取状态 */
SdReadState = SD_READ_DATA;
/* 读取BMP图片像素数据 */
Status = XSdPs_ReadPolled(&SdInstance, SdReadBuffer, 1, &SdBlocksRead, SD_READ_TIMEOUT);
if (Status != XST_SUCCESS) {
xil_printf("ERROR: Failed to read BMP data from SD card\n");
return XST_FAILURE;
}
/* 等待SD卡读取完成 */
while (!SDReadDone);
/* 将像素数据存储到DDR中 */
memcpy(DdrBaseAddr, SdReadBuffer + SdImageDataOffset, SdFileSize - SdImageDataOffset);
return XST_SUCCESS;
}
int main()
{
int Status;
/* 初始化SD卡 */
Status = InitializeSd();
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/* 初始化DDR */
Status = InitializeDdr();
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/* 初始化中断控制器 */
Status = InitializeIntc();
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/* 读取SD卡中的BMP图片 */
Status = ReadBmpImage();
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
return XST_SUCCESS;
}
```
需要注意的是,由于SD卡读取和DDR存储操作都是比较耗时的,因此我们需要使用中断来异步处理SD卡读取操作,并在读取完成后再将数据存储到DDR中。在上面的代码中,我们使用了SDReadDone变量来判断SD卡读取是否完成,在中断处理函数中设置该变量的值。另外,我们还需要在main函数中等待SDReadDone变量的值变为1,以保证SD卡读取完成后再将数据存储到DDR中。
阅读全文