stm32f429i-discovery with mod-mrf24j40 Pin connection: *** UEXT - f429 Vcc - 3V GND - GND USART2: Wake - PA2 INT - PA3 I2C2: RST - PB10 not - PB11 SPI2: SDO - PB14 SDI - PB15 SCK - BP13 CS - PB12