TM4C1294NCPDT: serial programming of custom board designed using tm4c1294ncpdt

Hi Digvijay,
Please refer to the TivaWare boot_serial (the boot loader) and the boot_demo1.bin (the application) examples. The boot_serial must be first loaded to the flash via JTAG interface. Once it is running it will download the boot_demo1.bin via LM flash programmer. You can specify which pin to activate the bootloading.

digvijay khambe said:

Also share the detail information about programming/boot loading...

That's a "Command" is it not?     Never wise when requesting "forum" (voluntary) assistance...

As "sharing" is deemed important - might poster  Vijay  "share" the efforts he's made - in his own behalf - lessening the demands upon "hapless/ordered"  helper crüe.

Hi charles
Thanks for previous reply. I get that i can specify any pin for boot loading. But real question is how to do it??. From datasheet i can understand that i have to modify FMPREn and FMPPEn registers. But i am not able to figure out that, how to modify these registers using GPIO. So please can you shed some light on this.

thank you.

Hi digvijay,

 Are you looking for the flash-based bootloader or ROM based bootloader?

 If you are looking for a flash-based bootloader for which the boot_cserial example is created for then you can use the bl_config.h to specify which pin you want to use to force firmware update. Please go through the bl_config.h file. Below is a snippet of the bl_config.h

//*****************************************************************************
//
// Enables the pin-based forced update check.  When enabled, the boot loader
// will go into update mode instead of calling the application if a pin is read
// at a particular polarity, forcing an update operation.  In either case, the
// application is still able to return control to the boot loader in order to
// start an update.  For applications which need to perform more complex
// checking than is possible using a single GPIO, a hook function may be
// provided using BL_CHECK_UPDATE_FN_HOOK instead.
//
// Depends on: None
// Exclusive of: None
// Requires: FORCED_UPDATE_PERIPH, FORCED_UPDATE_PORT, FORCED_UPDATE_PIN,
//           FORCED_UPDATE_POLARITY
//
//*****************************************************************************
//#define ENABLE_UPDATE_CHECK

//*****************************************************************************
//
// The GPIO module to enable in order to check for a forced update.  This will
// be one of the SYSCTL_RCGC2_GPIOx values, where "x" is replaced with the port
// name (such as B).  The value of "x" should match the value of "x" for
// FORCED_UPDATE_PORT.
//
// Depends on: ENABLE_UPDATE_CHECK
// Exclusive of: None
// Requries: None
//
//*****************************************************************************
//#define FORCED_UPDATE_PERIPH    SYSCTL_RCGC2_GPIOB

//*****************************************************************************
//
// The GPIO port to check for a forced update.  This will be one of the
// GPIO_PORTx_BASE values, where "x" is replaced with the port name (such as
// B).  The value of "x" should match the value of "x" for
// FORCED_UPDATE_PERIPH.
//
// Depends on: ENABLE_UPDATE_CHECK
// Exclusive of: None
// Requries: None
//
//*****************************************************************************
//#define FORCED_UPDATE_PORT      GPIO_PORTB_BASE

//*****************************************************************************
//
// The pin to check for a forced update.  This is a value between 0 and 7.
//
// Depends on: ENABLE_UPDATE_CHECK
// Exclusive of: None
// Requries: None
//
//*****************************************************************************
//#define FORCED_UPDATE_PIN       4

//*****************************************************************************
//
// The polarity of the GPIO pin that results in a forced update.  This value
// should be 0 if the pin should be low and 1 if the pin should be high.
//
// Depends on: ENABLE_UPDATE_CHECK
// Exclusive of: None
// Requries: None
//
//*****************************************************************************
//#define FORCED_UPDATE_POLARITY  0

//*****************************************************************************
//
// This enables a weak pull-up or pull-down for the GPIO pin used in a forced
// update.  Only one of FORCED_UPDATE_WPU or FORCED_UPDATE_WPD should be
// defined, or neither if a weak pull-up or pull-down is not required.
//
// Depends on: ENABLE_UPDATE_CHECK
// Exclusive of: None
// Requries: None
//
//*****************************************************************************
//#define FORCED_UPDATE_WPU
//#define FORCED_UPDATE_WPD