使用 AM5728/AM57XX openCL查询硬件资源

我们知道AM5728/AM57XX系列芯片支持使用openCL来调用DSP，因此可以通过openCL硬件加速来提升算法效率，降低 CPU使用率.openCL是一个为异构系统编写程序的框架，该异构系统可以由CPU，GPU，DSP甚至FPGA组成，因此openCL开发人员需要对其运行的硬件平台有非常大的了解，下面程序主要用来查询openCL的硬件资源。

程序源码如下
```
int main(void)
{
char strings[512];
cl_uint num_platform;
cl_platform_id platform_id[20];
cl_uint num_device;
cl_device_id device_id[20];
cl_device_type device_type;
cl_ulong tmp;

clGetPlatformIDs(0, NULL, &num_platform);
clGetPlatformIDs(num_platform, platform_id, NULL);

for (int i = 0; i < num_platform; i ++) {

      clGetPlatformInfo(platform_id, CL_PLATFORM_NAME, 512, strings, NULL);
      printf("platform name [%s]\n", strings);

      clGetPlatformInfo(platform_id, CL_PLATFORM_VENDOR, 512, strings, NULL);
      printf("platform vendor [%s]\n", strings);

      clGetPlatformInfo(platform_id, CL_PLATFORM_VERSION, 512, strings, NULL);
      printf("platform version [%s]\n", strings);

      clGetPlatformInfo(platform_id, CL_PLATFORM_PROFILE, 512, strings, NULL);
      printf("platform profile [%s]\n", strings);

      clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_ALL, 20, device_id, &num_device);
      for (int j = 0; j < num_device; j ++) {
         clGetDeviceInfo(device_id[j], CL_DEVICE_TYPE, sizeof(cl_device_type),
                        &device_type, NULL);
         if (device_type == CL_DEVICE_TYPE_CPU)
            printf("device type [cpu]\n");
         else if (device_type == CL_DEVICE_TYPE_GPU)
            printf("device type [gpu]\n");
         else if (device_type == CL_DEVICE_TYPE_ACCELERATOR)
            printf("device type [accelerator]\n");

         clGetDeviceInfo(device_id[j], CL_DEVICE_NAME, 512, strings, NULL);
         printf("device name [%s]\n", strings);

         clGetDeviceInfo(device_id[j], CL_DEVICE_GLOBAL_MEM_SIZE,
                        sizeof(cl_ulong), &tmp, NULL);
         printf("device global mem [%lld]MB\n", tmp/1024/1024);

         clGetDeviceInfo(device_id[j], CL_DEVICE_GLOBAL_MEM_CACHE_SIZE,
                        sizeof(cl_ulong), &tmp, NULL);
         printf("device global mem cache [%lld]KB\n", tmp/1024);

         clGetDeviceInfo(device_id[j], CL_DEVICE_LOCAL_MEM_SIZE,
                        sizeof(cl_ulong), &tmp, NULL);
         printf("device local mem [%lld]KB\n", tmp/1024);

         clGetDeviceInfo(device_id[j], CL_DEVICE_MAX_MEM_ALLOC_SIZE,
                        sizeof(cl_ulong), &tmp, NULL);
         printf("device max mem alloc [%lld]MB\n", tmp/1024/1024);

         clGetDeviceInfo(device_id[j], CL_DEVICE_MAX_CLOCK_FREQUENCY,
                        sizeof(cl_ulong), &tmp, NULL);
         printf("device max clock frequency [%lld]MHZ\n", tmp);

         clGetDeviceInfo(device_id[j], CL_DEVICE_MAX_COMPUTE_UNITS,
                        sizeof(cl_ulong), &tmp, NULL);
         printf("device max compute unit [%lld]\n", tmp);
      }
}

return 0;
}
```