Micro sd card pins are:
- CS-Card Select
- DI-Data In [MOSI]-Master, Out Slave Input
- VSS-Ground
- VDD-Power
- CLK-Clock [SCLK]-Serial Clock
- DO-Data Out [MISO]-Master Input, Slave Output
- NC (Memory Cards)
SD
| pin | 4-bit SD | 1-bit SPI |
|---|---|---|
| 9 | DAT2 | - |
| 1 | CD/DAT3 | CS |
| 2 | CMD | DI |
| 3 | VSS1 | VSS1 |
| 4 | VDD | VDD |
| 5 | CLK | SCLK |
| 6 | VSS2 | VSS2 |
| 7 | DAT0 | DO |
| 8 | DAT1 | - |
common error
sdmmc_host_start_command returned 0x107
increase power supply?
testing with 1bit mode?
update firmware? https://github.com/espressif/arduino-esp32/issues/7373
test log https://esp32.com/viewtopic.php?t=2604&start=10