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Bluetooth Hardware Interface

The Bluetooth radio is connected through a UART1 (TX/RX/CTS/RTS) interface on the MitySOM-335x to the AM335x CPU. Also required is a single enable GPIO for the Bluetooth radio.

AM335x Ball TiWi-BLE Function
D15 UART1_TXD
D16 UART1_RXD
D17 UART1_RTS
D18 UART1_CTS
T13 BT Enable

Included below is the specific entry in the arch/arm/mach-omap2/board-mityarm335x.c file.

  • UART1_TXD
    {"uart1_txd.uart1_txd", AM33XX_PULL_ENBL | AM33XX_PULL_ENBL},
    
  • UART1_RXD
    {"uart1_rxd.uart1_rxd", AM33XX_PIN_INPUT_PULLUP},
    
  • UART1_RTS
    {"uart1_rtsn.uart1_rtsn", AM33XX_PIN_INPUT},
    
  • UART1_CTS
    {"uart1_ctsn.uart1_ctsn", AM33XX_PIN_OUTPUT},
    
  • BT Enable
    {"gpmc_csn3.gpio2_0", AM33XX_PULL_ENBL | AM33XX_PIN_OUTPUT},/*BT EN*/
    

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