[问答]

为什么ESP32-S3的SDIO接SD卡，用1bit数据和4bit数据读取文件，速度几乎没有差别？

问答对人有帮助，内容完整，我也想知道答案 0 4bit不是应该快很多吗，但是实际并没有快多少，600多K的文件，要700ms才能读完。这是1bit时的日志： I (0) cpu_start: App cpu up. I (1218) spiram: SPI SRAM memory test OK I (1227) cpu_start: Pro cpu start user code I (1227) cpu_start: cpu freq: 240000000 I (1227) cpu_start: Application information: I (1230) cpu_start: Project name: sd_card I (1235) cpu_start: App version: ac75c64-dirty I (1241) cpu_start: Compile time: Apr 6 2022 14:41:49 I (1247) cpu_start: ELF file SHA256: 9c75e896892f3e6c... I (1253) cpu_start: ESP-IDF: v4.4-dirty I (1258) heap_init: Initializing. RAM available for dynamic allocation: I (1266) heap_init: At 3FC951D8 len 0004AE28 (299 KiB): D/IRAM I (1272) heap_init: At 3FCE0000 len 0000EE34 (59 KiB): STACK/DRAM I (1279) heap_init: At 3FCF0000 len 00008000 (32 KiB): DRAM I (1285) heap_init: At 600FE000 len 00002000 (8 KiB): RTCRAM I (1292) spiram: Adding pool of 8192K of external SPI memory to heap allocator I (1300) spi_flash: detected chip: gd I (1304) spi_flash: flash io: dio I (1308) sleep: Configure to isolate all GPIO pins in sleep state I (1315) sleep: Enable automatic switching of GPIO sleep configuration I (1322) cpu_start: Starting scheduler on PRO CPU. I (0) cpu_start: Starting scheduler on APP CPU. I (1337) spiram: Reserving pool of 32K of internal memory for DMA/internal allocations I (1346) example: Initializing SD card I (1350) example: Using SDMMC peripheral I (1355) example: Mounting filesystem I (1359) gpio: GPIO[8\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1369) gpio: GPIO[10\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1378) gpio: GPIO[6\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1435) example: Filesystem mounted Name: SD Type: SDSC Speed: 20 MHz Size: 121MB I (1436) example: Opening file /sdcard/hello.txt I (1446) example: File written I (1450) example: Renaming file /sdcard/hello.txt to /sdcard/foo.txt I (1452) example: Reading file /sdcard/foo.txt I (1456) example: Read from file: 'Hello SD !' I (1556) example: list: /,open succeed I (1557) example: file: 2.MJP , size: 622178 , fattrib: 32 I (1557) example: file: FOO.TXT , size: 13 , fattrib: 32 I (1562) example: free_heap_size = 8082979 I (1567) example: free_heap_size = 8078883 I (2279) example: read 622178 bytes in 707 ms I (2280) example: free_heap_size = 8082979 I (2280) example: Card unmounted GeSHi © Codebox Plus Extension 这是4bit时的日志： Code: [Select all] [Expand/Collapse] I (0) cpu_start: App cpu up. I (1218) spiram: SPI SRAM memory test OK I (1227) cpu_start: Pro cpu start user code I (1227) cpu_start: cpu freq: 240000000 I (1227) cpu_start: Application information: I (1230) cpu_start: Project name: sd_card I (1235) cpu_start: App version: ac75c64-dirty I (1241) cpu_start: Compile time: Apr 6 2022 14:41:49 I (1247) cpu_start: ELF file SHA256: ca6d01d26a856673... I (1253) cpu_start: ESP-IDF: v4.4-dirty I (1258) heap_init: Initializing. RAM available for dynamic allocation: I (1266) heap_init: At 3FC951D8 len 0004AE28 (299 KiB): D/IRAM I (1272) heap_init: At 3FCE0000 len 0000EE34 (59 KiB): STACK/DRAM I (1279) heap_init: At 3FCF0000 len 00008000 (32 KiB): DRAM I (1285) heap_init: At 600FE000 len 00002000 (8 KiB): RTCRAM I (1292) spiram: Adding pool of 8192K of external SPI memory to heap allocator I (1300) spi_flash: detected chip: gd I (1304) spi_flash: flash io: dio I (1308) sleep: Configure to isolate all GPIO pins in sleep state I (1315) sleep: Enable automatic switching of GPIO sleep configuration I (1322) cpu_start: Starting scheduler on PRO CPU. I (0) cpu_start: Starting scheduler on APP CPU. I (1337) spiram: Reserving pool of 32K of internal memory for DMA/internal allocations I (1346) example: Initializing SD card I (1350) example: Using SDMMC peripheral I (1355) example: Mounting filesystem I (1359) gpio: GPIO[8\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1369) gpio: GPIO[10\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1378) gpio: GPIO[6\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1387) gpio: GPIO[7\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1396) gpio: GPIO[12\| InputEn: 0\| OutputEn: 0\| OpenDrain: 0\| Pullup: 1\| Pulldown: 0\| Intr:0 I (1406) gpio: GPIO[5\| InputEn: 0\| OutputEn: 1\| OpenDrain: 0\| Pullup: 0\| Pulldown: 0\| Intr:0 I (1463) example: Filesystem mounted Name: SD Type: SDSC Speed: 20 MHz Size: 121MB I (1464) example: Opening file /sdcard/hello.txt I (1474) example: File written I (1530) example: Renaming file /sdcard/hello.txt to /sdcard/foo.txt I (1532) example: Reading file /sdcard/foo.txt I (1533) example: Read from file: 'Hello SD !' I (1633) example: list: /,open succeed I (1633) example: file: 2.MJP , size: 622178 , fattrib: 32 I (1633) example: file: FOO.TXT , size: 13 , fattrib: 32 I (1639) example: free_heap_size = 8082979 I (1643) example: free_heap_size = 8078883 I (2356) example: read 622178 bytes in 707 ms I (2356) example: free_heap_size = 8082979 I (2357) example: Card unmounted 0
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