Trouble modifiying kinetis bootloader to UART2 on KL25

[carlosglez]

Hi! 
  

  I download the Kinetis Bootloader 2.0.0 and try with the default pins and configuration (UART0) and it works. Now I want to modify to UART2 but have some troubles with it. Once I download my code to the board, I can´t connect with the board with the Kinetis Flash Tool. 

  I already change some variables of the code to use UART2 but still not working. 

   When initializing the default UART0 theres a line as follow:

SIM->SOPT2 = SIM_SOPT2_PLLFLLSEL_MASK // set PLLFLLSEL to select the PLL for this clock source
                        | SIM_SOPT2_UART0SRC(1); // select the PLLFLLCLK as UART0 clock source

But theres not SRC for UART2, does this affect? I initialize my UART2 clock as following  SIM->SCGC4 |= SIM_SCGC4_UART2_MASK;

 The question is: Is it posible to use bootloader with UART2? in case of yes, any idea of what can I be missing?

Thanks!!

CarlosG.

[merigotbertrand]

I forgot,

I changed nothing in the kinetisflashtools.

regards

bertrand

[merigotbertrand]

Hello carlos.

I just finish a bootloader on a kinetis KV46,

Some files need to be modified in order to activate your IO

On my side I changed :

Hardware_init_Kxx.C files

(get_uart_clock) check if your uart is in the list

Peripherals_Kxx.C files

(const peripheral_descriptor_t g_peripherals array) check the instance value

Peripheral_pinmux.h

(peripheral enable configuration) check if BL_ENABLE_PINMUX is correct

(UART pinmux configurations) check your configuration and adapt it to the port you want to use

#define UART2_RX_PORT_BASE
#define UART2_RX_GPIO_BASE
#define UART2_RX_GPIO_PIN_NUM
#define UART2_RX_FUNC_ALT_MODE
#define UART2_RX_GPIO_ALT_MODE
#define UART2_RX_GPIO_IRQn
#define UART2_RX_GPIO_IRQHandler
#define UART2_TX_PORT_BASE
#define UART2_TX_GPIO_PIN_NUM
#define UART2_TX_FUNC_ALT_MODE

Now my kinetis bootloader is running well with autobaud 256Kb/sec but the way long

regards

Bertrand

[kerryzhou]

Hi CarlosG,

    UART1 and UART2 modules operate from the bus clock, so you just need to use the bus clock. You don't need to care about:

SIM->SOPT2 = SIM_SOPT2_PLLFLLSEL_MASK // set PLLFLLSEL to select the PLL for this clock source
                        | SIM_SOPT2_UART0SRC(1); // select the PLLFLLCLK as UART0 clock source

You need to modify peripherals_pinmux.h, modify the UART0 to UART2, and use the UART2 pin. Peripherals_MKL25Z4.c also need to modify the g_peripherals to UART2 interface.

Please try it on your side.

Wish it helps you!

Have a great day,
Kerry

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[carlosglez]

Hi Kerry!

    Thanks for your soon answer. I actually change those files but still not working. Anything else? I read on the KL25 reference manual that UART2 has not autobaudrate. So I also change that and set a static baudrate but can't connect with the tool.

     Any idea?

CarlosG.

[kerryzhou]

Hi Carlos Gonzalez,

  Please tell me which UART2 pin you want to use, I will try it on my side, then tell you the details.

Have a great day,
Kerry

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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[carlosglez]

Hi Kerry, 

   I'm using the UART2 pin D2 and D3. Thanks for your help!

CarlosG. 

[kerryzhou]

Hi Carlos,

   Do you debug your modified bootloader? After you connect with the KinetisFlashTool, where the code is stopping on your side?

Kerry