How to make bootloader on another UART than UART0? (K64f)

[grochal7]

Hello!

I'm using the frdm k64f and i'm testing the bootloader with examples. I'm using the freedom_bootloader example from bootloader_examples (SDK 2.5.0) and the KinetisFlashTool for updating programs.

For me both examples - led_demo_freedom_0000 (without bootloader) and led_demo_freedom_a000 (with BL) works!

Now I try to use another UART for updating my program, e.g UART2 (RX - PTD2 TX - PTD3).

I found this note inside ""pinmux_utility_common.c":

//! this is to store the function pointer for calling back to the function that wants
//! the UART RX instance pin that triggered the interrupt. This only supports 1 pin
//! for UART0 because UART1 is on PORTC which does not support interrupts

Soo, is it possible to run my bootloader by using UART2 on PTD2/3?

Where can I check which uart is usable?

I found sth like this for MKV31F51212:

Hi,

Sorry for reply you so late.

I tested UART2, it can work. There are some key point you should pay attention to.

1. In peripherals_pinmux.c,

#define BL_ENABLE_PINMUX_UART2 (BL_CONFIG_SCUART)

 //! UART pinmux configurations
#define UART2_RX_PORT_BASE PORTE
#define UART2_RX_GPIO_BASE PTE
#define UART2_RX_GPIO_PIN_NUM 17 // PIN 16 in the PTB group
#define UART2_RX_FUNC_ALT_MODE kPORT_MuxAlt3 // ALT mode for UART0 RX
#define UART2_RX_GPIO_ALT_MODE kPORT_MuxAsGpio // ALT mdoe for GPIO functionality
#define UART2_RX_GPIO_IRQn PORTE_IRQn
#define UART2_RX_GPIO_IRQHandler PORTE_IRQHandler
#define UART2_TX_PORT_BASE PORTE
#define UART2_TX_GPIO_PIN_NUM 16 // PIN 17 in the PTB group
#define UART2_TX_FUNC_ALT_MODE kPORT_MuxAlt3 // ALT mode for UART0 TX



 2. In peripherals_KV31F512.c

#if BL_CONFIG_SCUART
 // UART0
 {.typeMask = kPeripheralType_UART,
 .instance = 2, //must set to 2
 .pinmuxConfig = uart_pinmux_config,
 .controlInterface = &g_scuartControlInterface,
 .byteInterface = &g_scuartByteInterface,
 .packetInterface = &g_framingPacketInterface },
#endif // BL_CONFIG_SCUART



 3. DSPI pin is conflict with UART2, please take care.



 4. In the function get_uart_clock(), you should add

 case 2:
 return get_bus_clock();



 Regards,

Jing‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Quotation from: https://community.nxp.com/thread/474392 

I did all what Jing suggested and I still cant connect with KinetisFlashTool.

jingpan‌ maybe u have any other suggestions?

Regards!

[jorge_a_vazquez · Accepted solution]

Hi

In the K64F device, MCUBOOT uses PTD2 and PTD3 with the DSPI communication, so there is a conflict when you try to communicate with UART but this pin is rooted with the SPI functionality.

I disable the SPI peripheral in the bootloader_config.h file as below:

#if !defined(BL_CONFIG_SCUART)
#define BL_CONFIG_SCUART (1)
#endif
#if !defined(BL_CONFIG_I2C)
#define BL_CONFIG_I2C (1)
#endif
#if !defined(BL_CONFIG_DSPI)
#define BL_CONFIG_DSPI (0)
#endif
#if !defined(BL_CONFIG_USB_HID)
#define BL_CONFIG_USB_HID (1)
#endif
#if !defined(BL_CONFIG_USB_MSC)
#define BL_CONFIG_USB_MSC (1)
#endif
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

then I change the code to enable UART2 as you do and I was able to communicate with the Kinetisflashtool.

Hope this helps

Best regards

[grochal7]

Yes! Great! It was the problem!

Thank You very much!