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6626 Flash 数据可以通过 SF 接口 drv_sf_read 和 Cache 地址 及NoCache 地址读取。 以下为示例，有几个注意事项 1- Cache 地址指针读取时，如果Flash被写或者擦除或者修改过。 可能读到Cache里的旧数据。保证不了一定实时反应在Flash中的情况。 如果drv_icache_invalidate()是可以清除刷新Cache，但同时也会导致前后8Kb Cache RAM 全清除了。 2-NoCache 地址指针，在应用中不要使用。 3- 会变化的数据，建议最好使用 drv_sf_read来读。 void example_sf(void) { //OM6XXX has internal SPI Flash, // its cachable address is located at [0x00400000,0x00800000), // and non-cachable address is in [0x50000000,0x51000000). #define Test_addr (200 * 1024) #define Test_byte (16) uint8_t m; volatile char *ptr_Cache; volatile char *ptr_NoCache; static uint8_t write_buf[100]; /// Buffer that stored the data to be read static uint8_t read_buf[100]; drv_sf_enable(OM_SF, 0); ptr_Cache = 0x00400000 + Test_addr; ptr_NoCache = 0x50000000 + Test_addr; OM_LOG_DEBUG("Addr ptr_Cache:0x%08X,ptr_NoCache:0x%08X", ptr_Cache, ptr_NoCache); for (int loop = 0; loop < 20; loop++) { /* code */ for (uint8_t i = 0; i < 100; i++) { write_buf[i] = loop + i; } /* inside flash */ // Enable Flash // Erase 4k in 128k drv_sf_erase(OM_SF, 0, Test_addr, 4 * 1024); // Read 100 bytes in 128k, it should be all 0xFF drv_sf_read(OM_SF, 0, Test_addr, read_buf, Test_byte); OM_LOG_DEBUG_ARRAY_EX("\n1-erase and drv Read :", read_buf, Test_byte); OM_LOG_DEBUG_ARRAY_EX("2-*ptr_Cache read:", ptr_Cache, Test_byte); OM_LOG_DEBUG("3-*ptr_NoCache read"); for (uint8_t m = 0; m < Test_byte; m++) { OM_LOG_DEBUG("%02X ", *(volatile uint8_t *)(ptr_NoCache + m)); } // Write Test_byte bytes to 128k drv_sf_write(OM_SF, 0, Test_addr, write_buf, Test_byte); // Read Test_byte bytes in 128k, it should be same as write_buf drv_sf_read(OM_SF, 0, Test_addr, read_buf, Test_byte); OM_LOG_DEBUG_ARRAY_EX("\n4-write and drv Read :", read_buf, Test_byte); OM_LOG_DEBUG("5-*ptr_Cache read:"); for (uint8_t m = 0; m < Test_byte; m++) { OM_LOG_DEBUG("%02X ", *(volatile uint8_t *)(ptr_Cache + m)); } OM_LOG_DEBUG("\n6-*ptr_NoCache read:"); for (uint8_t m = 0; m < Test_byte; m++) { OM_LOG_DEBUG("%02X ", *(volatile uint8_t *)(ptr_NoCache + m)); } OM_LOG_DEBUG_ARRAY_EX("\n7-*ptr_Cache read:", ptr_Cache, Test_byte); OM_LOG_DEBUG("\n"); } while (1); } =================== Log =========================== 1-erase and drv Read :: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF [16bytes] 2-*ptr_Cache read:: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF [16bytes] 3-*ptr_NoCache readFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 4-write and drv Read :: 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 [16bytes] 5-*ptr_Cache read:12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 6-*ptr_NoCache read:12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 7-*ptr_Cache read:: 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 [16bytes] 1-erase and drv Read :: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF [16bytes] 2-*ptr_Cache read:: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF [16bytes] 3-*ptr_NoCache readFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 4-write and drv Read :: 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 [16bytes] 5-*ptr_Cache read:13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 6-*ptr_NoCache read:13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 7-*ptr_Cache read:: 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 [16bytes] |
6626_SF_TEST-202506176887.c