FallenSigh
e35fa5884d
The open-la500 core has USE_CACHE enabled. Writes to 0x1c400000 go to the write-back data cache and never reach the SRAM model before the testbench checks ExtRAM. Use the 0xA0000000 uncached segment (same pattern as fft_dma/main.c).
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <common_func.h>
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#include <confreg_time.h>
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#include <dma.h>
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// BSP板级支持包所需全局变量
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unsigned long UART_BASE = 0xbf000000;
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unsigned long CONFREG_TIMER_BASE = 0xbf20f100;
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unsigned long CONFREG_CLOCKS_PER_SEC = 50000000L;
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unsigned long CORE_CLOCKS_PER_SEC = 33000000L;
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// 加上 aligned(64) 是为了防止 DMA 突发传输时跨越缓存行或 AXI 非对齐边界
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uint32_t src_array[64] __attribute__((aligned(64)));
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uint32_t dst_array[64] __attribute__((aligned(64)));
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int main(int argc, char** argv)
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{
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uint32_t data_len = 64;
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uint32_t byte_len = data_len * 4;
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// 虚拟地址转物理地址与无缓存地址
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// 屏蔽掉高 3 位（& 0x1FFFFFFF）即可获得真实的物理地址
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uint32_t phys_src_addr = ((uint32_t)src_array) & 0x1FFFFFFF;
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uint32_t phys_dst_addr = ((uint32_t)dst_array) & 0x1FFFFFFF;
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// 或上 0xA0000000 即可获得绕过 Cache 的无缓存（Uncached）指针
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volatile uint32_t *uncached_src = (volatile uint32_t *)(phys_src_addr | 0xA0000000);
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volatile uint32_t *uncached_dst = (volatile uint32_t *)(phys_dst_addr | 0xA0000000);
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// CPU 必须通过无缓存指针写入
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for (int i = 0; i < data_len; i++) {
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uncached_src[i] = i * i; // 填入 0~63
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uncached_dst[i] = 0xDEADBEEF; // 目的数组填入垃圾值，方便验证是否真的被覆盖
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}
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printf("src_array: %x\n", src_array);
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printf("dst_array: %x\n", dst_array);
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printf("phys_src_array: %x\n", phys_src_addr);
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printf("phys_dst_array: %x\n", phys_dst_addr);
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printf("uncached_src: %x\n", uncached_src);
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printf("uncached_dst: %x\n", uncached_dst);
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// 配置 DMA：DMA 只需要最纯粹的物理地址
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dma_start_transfer(0, phys_src_addr, phys_dst_addr, byte_len);
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dma_wait_polling(0);
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printf("dma passed!\n");
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// 校验数据：CPU 必须通过无缓存指针读取
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int err = 0;
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for (int i = 0; i < data_len; i++) {
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uint32_t val = uncached_dst[i];
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printf("%d: %d\n", i, val);
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if (val != i * i) {
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err++;
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}
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}
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if (err == 0) {
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printf("\nSuccess! Array to Array DMA transfer verified.\n");
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} else {
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printf("\nFailed! Found %d errors.\n", err);
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}
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return 0;
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} |