Strapping pins
Posted: Mon Aug 07, 2017 11:58 pm
I'm somewhat confused by the documentation on strapping pins. I think there's a mistake.
Rev 1.5 of ESP32 Datasheet section 2.4 discusses them. It says there are 5 while Rev 2.2 of the Technical Reference Manual shows 6 bits used in the GPIO_STRAPPING register. The ESP32 Datasheet also has MTDO doing 2 things, controlling Debugging Log on U0TXD and setting the Timing of SDIO Slave. I think GPIO4 should probably be one of those to match the TRM, but it's not clear which one.
Rev 1.5 of ESP32 Datasheet section 2.4 discusses them. It says there are 5 while Rev 2.2 of the Technical Reference Manual shows 6 bits used in the GPIO_STRAPPING register. The ESP32 Datasheet also has MTDO doing 2 things, controlling Debugging Log on U0TXD and setting the Timing of SDIO Slave. I think GPIO4 should probably be one of those to match the TRM, but it's not clear which one.