99 lines
3.5 KiB
C
99 lines
3.5 KiB
C
/* Himem API example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "esp_system.h"
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#include "nvs_flash.h"
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#include "esp_heap_caps.h"
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#include "esp_spiram.h"
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#include "rom/cache.h"
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#include "sdkconfig.h"
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#include "esp_himem.h"
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//Fill memory with pseudo-random data generated from the given seed.
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//Fills the memory in 32-bit words for speed.
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static void fill_mem_seed(int seed, void *mem, int len)
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{
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uint32_t *p = (uint32_t *)mem;
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unsigned int rseed = seed ^ 0xa5a5a5a5;
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for (int i = 0; i < len / 4; i++) {
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*p++ = rand_r(&rseed);
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}
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}
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//Check the memory filled by fill_mem_seed. Returns true if the data matches the data
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//that fill_mem_seed wrote (when given the same seed).
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//Returns true if there's a match, false when the region differs from what should be there.
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static bool check_mem_seed(int seed, void *mem, int len, int phys_addr)
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{
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uint32_t *p = (uint32_t *)mem;
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unsigned int rseed = seed ^ 0xa5a5a5a5;
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for (int i = 0; i < len / 4; i++) {
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uint32_t ex = rand_r(&rseed);
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if (ex != *p) {
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printf("check_mem_seed: %x has 0x%08x expected 0x%08x\n", phys_addr+((char*)p-(char*)mem), *p, ex);
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return false;
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}
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p++;
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}
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return true;
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}
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//Allocate a himem region, fill it with data, check it and release it.
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static bool test_region(int check_size, int seed)
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{
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esp_himem_handle_t mh; //Handle for the address space we're using
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esp_himem_rangehandle_t rh; //Handle for the actual RAM.
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bool ret = true;
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//Allocate the memory we're going to check.
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ESP_ERROR_CHECK(esp_himem_alloc(check_size, &mh));
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//Allocate a block of address range
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ESP_ERROR_CHECK(esp_himem_alloc_map_range(ESP_HIMEM_BLKSZ, &rh));
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for (int i = 0; i < check_size; i += ESP_HIMEM_BLKSZ) {
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uint32_t *ptr = NULL;
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//Map in block, write pseudo-random data, unmap block.
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ESP_ERROR_CHECK(esp_himem_map(mh, rh, i, 0, ESP_HIMEM_BLKSZ, 0, (void**)&ptr));
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fill_mem_seed(i ^ seed, ptr, ESP_HIMEM_BLKSZ); //
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ESP_ERROR_CHECK(esp_himem_unmap(rh, ptr, ESP_HIMEM_BLKSZ));
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}
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vTaskDelay(5); //give the OS some time to do things so the task watchdog doesn't bark
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for (int i = 0; i < check_size; i += ESP_HIMEM_BLKSZ) {
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uint32_t *ptr;
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//Map in block, check against earlier written pseudo-random data, unmap block.
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ESP_ERROR_CHECK(esp_himem_map(mh, rh, i, 0, ESP_HIMEM_BLKSZ, 0, (void**)&ptr));
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if (!check_mem_seed(i ^ seed, ptr, ESP_HIMEM_BLKSZ, i)) {
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printf("Error in block %d\n", i / ESP_HIMEM_BLKSZ);
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ret = false;
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}
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ESP_ERROR_CHECK(esp_himem_unmap(rh, ptr, ESP_HIMEM_BLKSZ));
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if (!ret) break; //don't check rest of blocks if error occurred
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}
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//Okay, all done!
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ESP_ERROR_CHECK(esp_himem_free(mh));
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ESP_ERROR_CHECK(esp_himem_free_map_range(rh));
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return ret;
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}
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void app_main()
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{
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size_t memcnt=esp_himem_get_phys_size();
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size_t memfree=esp_himem_get_free_size();
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printf("Himem has %dKiB of memory, %dKiB of which is free. Testing the free memory...\n", (int)memcnt/1024, (int)memfree/1024);
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assert(test_region(memfree, 0xaaaa));
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printf("Done!\n");
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}
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