BOOTCFG not being written

Manoj Kumar91

Other Parts Discussed in Thread: TM4C1237D5PZ

Hi,

I would appreciate if somebody can help me out understand how to write BOOTCFG register for PIN E6 for processor TM4c1237D5PZ. I am using following code with no success.

#define FLASH_FMA 0x400FD000
#define FLASH_FMD 0x400FD004
#define FLASH_FMC 0x400FD008
#define FLASH_FMC_WRKEY 0xA442
#define FLASH_FMC_COMT 0x8

HWREG(FLASH_FMA) = 0x75100000;
HWREG(FLASH_FMD) = 0xFFFF9BFE;
HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;

while (HWREG(FLASH_FMC) & FLASH_FMC_COMT)
{
}

over 7 years ago

0 Manoj Kumar91 over 7 years ago

Prodigy 220 points

I got it working

0 Manoj Kumar91 over 7 years ago

Prodigy 220 points

This is working code.
// FMA should have this value to program BOOTCFG
HWREG(0x400FD000) = 0x75100000;
// Data to be flashed in BOOTCFG, must be stored in FMD
HWREG(0x400FD004) = 0xFFFF9AFE; //FMD
// FMC should have writekey and commit bit
HWREG(0x400FD008) = 0xA4420000 | 0x9; // FMC
// Wait until commit is complete
while (HWREG(0x400FD008) & 0x9)
{
}

But now i have different problem that i am not able to enable UART0 even in user code mode. Following code throws error.
/* Enable UART0 */
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

0 Amit Ashara over 7 years ago

TI__Guru**** 244380 points

Hello Manoj,

The datasheet documentation is very clear about it. Also the JTAG application note also carries the code for the same.

Arm-based microcontrollers

Arm-based microcontrollers forum

BOOTCFG not being written