Espressif ESP32 Technical Reference Manual page 145

7 SPI Controller (SPI)
31 28 27
7 0 0 0
SPI_USR_COMMAND_BITLEN It indicates the bit length of the command phase minus one in SPI
half-duplex mode and QSPI mode. It is only valid when SPI_USR_COMMAND is set to 1. (R/W)
SPI_USR_COMMAND_VALUE It indicates the value of the command to be transmitted in SPI half-
duplex mode and QSPI mode. It is only valid when SPI_USR_COMMAND is set to 1. (R/W)
31
0 0 0 0 0 0 0
SPI_USR_MOSI_DBITLEN It indicates the length of MOSI data minus one, in multiples of one bit. It
is only valid when SPI_USR_MOSI is set to 1 in master mode. (R/W)
31
0 0 0 0 0 0 0
SPI_USR_MISO_DBITLEN It indicates the length of MISO data minus one, in multiples of one bit. It
is only valid when SPI_USR_MISO is set to 1 in master mode. (R/W)
Espressif Systems
Register 7.10. SPI_USER2_REG (0x24)
0 0 0 0 0 0 0 0
Register 7.11. SPI_MOSI_DLEN_REG (0x28)
24 23
0
Register 7.12. SPI_MISO_DLEN_REG (0x2C)
24 23
0
Submit Documentation Feedback
16 15
0 0 0 0 0 0 0 0
0x0000000
0x0000000
145
0 0 0 0 0 0 0 0
ESP32 TRM (Version 5.2)
0
0
Reset
0
Reset
0
Reset