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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/timeb.h>
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// 函数：从设备读取数据到本地内存（缓冲区）
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// 功能：实现设备到主机的数据传输
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// 参数：
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// dev_fd : 设备实例句柄
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// addr : 设备中的源地址
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// buffer : 缓冲区基指针
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// size : 数据大小
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// 返回值：
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// 成功：0；失败：-1
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int dev_read (int dev_fd, uint64_t addr, void *buffer, uint64_t size) {
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if ( addr != lseek(dev_fd, addr, SEEK_SET) ) // 调整文件偏移到指定地址
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return -1; // 偏移失败
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if ( size != read(dev_fd, buffer, size) ) // 从设备读取数据到缓冲区
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return -1; // 读取失败
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return 0;
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}
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// 函数：从本地内存（缓冲区）写数据到设备
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// 功能：实现主机到设备的数据传输
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// 参数：
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// dev_fd : 设备实例句柄
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// addr : 设备中的目标地址
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// buffer : 缓冲区基指针
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// size : 数据大小
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// 返回值：
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// 成功：0；失败：-1
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int dev_write (int dev_fd, uint64_t addr, void *buffer, uint64_t size) {
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if ( addr != lseek(dev_fd, addr, SEEK_SET) )
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return -1;
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if ( size != write(dev_fd, buffer, size) )
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return -1;
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return 0;
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}
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// 函数：获取毫秒级别的时间
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// 功能：返回当前时间的毫秒数
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static uint64_t get_millisecond () {
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struct timeb tb;
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ftime(&tb);
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return (uint64_t)tb.millitm + (uint64_t)tb.time * 1000UL;
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// tb.time is the number of seconds since 00:00:00 January 1, 1970 UTC time;
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// tb.millitm is the number of milliseconds in a second
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}
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// 函数：解析无符号整数
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// 功能：从字符串中解析出十六进制或十进制的无符号64位整数
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// 参数：
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// string : 输入的字符串
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// pvalue : 解析后的值的指针
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// 返回值：
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// 成功解析的项数，失败则为0
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int parse_uint (char *string, uint64_t *pvalue) {
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if ( string[0] == '0' && string[1] == 'x' ) // 十六进制格式"0xXXXXXXXX"
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return sscanf( &(string[2]), "%lx", pvalue);
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else // 十进制格式
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return sscanf( string , "%lu", pvalue);
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}
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#define DMA_MAX_SIZE 0x10000000UL // DMA操作的最大尺寸定义 256kb
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char USAGE[] =
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"Usage: \n"
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"\n"
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" 写入设备（主机到设备）:\n"
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" %s <文件名> to <设备名> <设备内地址> <大小>\n"
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" 示例:\n"
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" %s data.bin to /dev/xdma0_h2c_0 0x100000 0x10000\n"
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"\n"
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" 读取设备（设备到主机）:\n"
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" %s <文件名> from <设备名> <设备内地址> <大小>\n"
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" 示例:\n"
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" %s data.bin from /dev/xdma0_c2h_0 0x100000 0x10000\n";
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int main (int argc, char *argv[]) {
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int ret = -1;
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uint64_t millisecond;
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char usage_string [1024];
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char *dev_name, *file_name;
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char direction;
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uint64_t address, size;
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int dev_fd = -1;
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FILE *file_p = NULL;
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void *buffer = NULL;
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sprintf(usage_string, USAGE, argv[0], argv[0], argv[0], argv[0] );
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if (argc < 6) { // not enough argument
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puts(usage_string);
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return -1;
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}
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file_name = argv[1];
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direction = argv[2][0];
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dev_name = argv[3];
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if ( 0 == parse_uint(argv[4], &address) ) { // parse the address in the device
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puts(usage_string);
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return -1;
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}
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if ( 0 == parse_uint(argv[5], &size ) ) { // parse the size in the device
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puts(usage_string);
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return -1;
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}
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// print information:
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if (direction == 't') { // to (write device, host-to-device)
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printf("from : %s\n" , file_name);
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printf("to : %s addr=0x%lx\n" , dev_name, address);
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printf("size : 0x%lx\n\n" , size);
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} else if (direction == 'f') { // from (read device, device-to-host)
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printf("from : %s addr=0x%lx\n" , dev_name, address);
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printf("to : %s\n" , file_name);
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printf("size : 0x%lx\n\n" , size);
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} else {
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puts(usage_string);
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return -1;
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}
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if (size > DMA_MAX_SIZE || size == 0) {
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printf("*** ERROR: DMA size must larger than 0 and NOT be larger than %lu\n", DMA_MAX_SIZE);
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return -1;
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}
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buffer = malloc(size); // allocate local memory (buffer)
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if (buffer == NULL) {
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printf("*** ERROR: failed to allocate buffer\n");
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goto close_and_clear;
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}
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dev_fd = open(dev_name, O_RDWR); // open device
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if (dev_fd < 0) {
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printf("*** ERROR: failed to open device %s\n", dev_name);
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goto close_and_clear;
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}
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file_p = fopen(file_name, direction == 't' ? "rb" : "wb"); // open file for read/write
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if (file_p == NULL) {
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printf("*** ERROR: failed to open file %s\n", file_name);
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goto close_and_clear;
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}
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millisecond = get_millisecond(); // start time
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if (direction == 't') {
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if ( size != fread(buffer, 1, size, file_p) ) { // local file -> local buffer
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printf("*** ERROR: failed to read %s\n", file_name);
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goto close_and_clear;
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}
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if ( dev_write(dev_fd, address, buffer, size) ) { // local buffer -> device
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printf("*** ERROR: failed to write %s\n", dev_name);
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goto close_and_clear;
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}
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} else {
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if ( dev_read(dev_fd, address, buffer, size) ) { // device -> local buffer
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printf("*** ERROR: failed to read %s\n", dev_name);
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goto close_and_clear;
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}
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if ( size != fwrite(buffer, 1, size, file_p) ) { // local buffer -> local file
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printf("*** ERROR: failed to write %s\n", file_name);
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goto close_and_clear;
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}
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}
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millisecond = get_millisecond() - millisecond; // get time consumption
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millisecond = (millisecond > 0) ? millisecond : 1; // avoid divide-by-zero
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printf("time=%lu ms data rate=%.1lf KBps\n", millisecond, (double)size / millisecond );
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ret = 0;
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close_and_clear:
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if (buffer != NULL)
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free(buffer);
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if (dev_fd >= 0)
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close(dev_fd);
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if (file_p != NULL)
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fclose(file_p);
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return ret;
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}
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