测试代码如下
- while (1) {
-
- //#define SDRAM_TEST_BYTE
- //#define SDRAM_TEST_SHORT
- #define SDRAM_TEST_LONG
-
- #ifdef SDRAM_TEST_BYTE
- for (uint32_t i = 0; i < SDRAM_DEVICE_SIZE; i += 0x01) {
-
- *(volatile uint8_t *)(SDRAM_DEVICE_ADDR + i) = 0xA5;
-
- tmp = *(volatile uint8_t *)(SDRAM_DEVICE_ADDR + i);
-
- if (tmp == 0xA5) {
- #endif
-
- #ifdef SDRAM_TEST_SHORT
- for (uint32_t i = 0; i < SDRAM_DEVICE_SIZE; i += 0x02) {
-
- *(volatile uint16_t *)(SDRAM_DEVICE_ADDR + i) = 0xA512;
-
- tmp = *(volatile uint16_t *)(SDRAM_DEVICE_ADDR + i);
-
- if (tmp == 0xA512) {
- #endif
-
- #ifdef SDRAM_TEST_LONG
- for (uint32_t i = 0; i < SDRAM_DEVICE_SIZE; i += 0x04) {
-
- *(volatile uint32_t *)(SDRAM_DEVICE_ADDR + i) = 0x12345678;
-
- tmp = *(volatile uint32_t *)(SDRAM_DEVICE_ADDR + i);
-
- if (tmp == 0x12345678) {
- #endif
- HAL_Delay(100);
- BSP_LED_Toggle(LED1);
- } else {
- HAL_Delay(100);
- BSP_LED_Toggle(LED2);
- }
- }
- }
焊了两片核心板，单片机是 STM32F429IGT6，SDRAM是 W9812G6GH-6，其中一块完全测试通过的，另外一块按8位或者16位测试也是通过的，但是按32位写读测试就有误，写进去是 0x12345678，读出来变成 0x12345634了，不知道是什么问题，有人遇到过吗？
其中一块测试无问题，说明软件时序应该是没问题；如果是硬件问题，那按8位16位测试又是正常的，真是邪了！！！
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