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MSP432E411Y: Custom BSL using UART1 for app updating

Part Number: MSP432E411Y

Hello, 

Our HW comprises a USB to UART bridge (FT234XD). We'd like to connect the bridge's UART output to the MSP432411Y's UART1 port and perform app updating via the bridge. Clearly, a custom bootloader using UARt1 will need to be programmed in flash. Aside from this, how feasible and easy to achieve is this scheme?

Regards, Magda

  • Hi,

      I will suggest you first try out the flash-based serial UART bootloader example at C:\ti\simplelink_msp432e4_sdk_4_20_00_12\examples\nortos\MSP_EXP432E401Y\boot_loader\boot_serial_uart_flash. This example uses UART0. However, in the bl_config.h file you can specify other UART instances such as UART1 as the port for bootloading. You will need to change the macros defined in bl_config.h from UART0 to UART1. See below used for UART0.

    //*****************************************************************************
    //
    // Selects the baud rate to be used for the UART.
    //
    // Depends on: UART_ENABLE_UPDATE, CRYSTAL_FREQ
    // Exclusive of: UART_AUTOBAUD
    // Requires: None
    //
    //*****************************************************************************
    #define UART_FIXED_BAUDRATE     115200
    
    //*****************************************************************************
    //
    // Selects the clock enable for the UART peripheral module
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UARTx
    //
    //*****************************************************************************
    #define UART_CLOCK_ENABLE     SYSCTL_RCGCUART_R0
    
    //*****************************************************************************
    //
    // Selects the base address of the UART peripheral module
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_CLOCK_ENABLE
    //
    //*****************************************************************************
    #define UARTx                 UART0
    
    //*****************************************************************************
    //
    // Selects the clock enable for the GPIO corresponding to UART RX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_RXPIN_BASE, UART_RXPIN_PCTL and UART_RXPIN_POS
    //
    //*****************************************************************************
    #define UART_RXPIN_CLOCK_ENABLE  SYSCTL_RCGCGPIO_R0
    
    //*****************************************************************************
    //
    // Selects the base address for the GPIO corresponding to UART RX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_RXPIN_CLOCK_ENABLE, UART_RXPIN_PCTL and UART_RXPIN_POS
    //
    //*****************************************************************************
    #define UART_RXPIN_BASE          GPIOA
    
    //*****************************************************************************
    //
    // Selects the port control value for the GPIO corresponding to UART RX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_RXPIN_CLOCK_ENABLE, UART_RXPIN_BASE and UART_RXPIN_POS
    //
    //*****************************************************************************
    #define UART_RXPIN_PCTL          0x1
    
    //*****************************************************************************
    //
    // Selects the pin number for the GPIO corresponding to UART RX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_RXPIN_CLOCK_ENABLE, UART_RXPIN_BASE and UART_RXPIN_PCTL
    //
    //*****************************************************************************
    #define UART_RXPIN_POS           0
    
    //*****************************************************************************
    //
    // Selects the clock enable for the GPIO corresponding to UART TX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_TXPIN_BASE, UART_TXPIN_PCTL and UART_TXPIN_POS
    //
    //*****************************************************************************
    #define UART_TXPIN_CLOCK_ENABLE  SYSCTL_RCGCGPIO_R0
    
    //*****************************************************************************
    //
    // Selects the base address for the GPIO corresponding to UART TX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_TXPIN_CLOCK_ENABLE, UART_TXPIN_PCTL and UART_TXPIN_POS
    //
    //*****************************************************************************
    #define UART_TXPIN_BASE          GPIOA
    
    //*****************************************************************************
    //
    // Selects the port control value for the GPIO corresponding to UART TX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_TXPIN_CLOCK_ENABLE, UART_TXPIN_BASE and UART_TXPIN_POS
    //
    //*****************************************************************************
    #define UART_TXPIN_PCTL          0x1
    
    //*****************************************************************************
    //
    // Selects the pin number for the GPIO corresponding to UART TX pin
    //
    // Depends on: UART_ENABLE_UPDATE
    // Exclusive of: None
    // Requires: UART_TXPIN_CLOCK_ENABLE, UART_TXPIN_BASE and UART_TXPIN_PCTL
    //
    //*****************************************************************************
    #define UART_TXPIN_POS           1