topic Re: UART0 API functions in KSDK v2.0 in Kinetis Software Development Kit

UART0 API functions in KSDK v2.0

danieltruong — Wed, 21 Dec 2016 00:55:59 GMT

Hi,

I'm just wondering how one can use API function to initialize the UART0 channel in Kinetis micro such as UART_Init() in the "fsl_uart.c" driver in KSDK v2.0 ?

It is obvious that this function UART_Init() is designed for UART1 & UART2 because of the structure type is different (UART_Type) from UART0 (UART0_Type).

Here's the function prototype:

status_t UART_Init(UART_Type *base, const uart_config_t *config, uint32_t srcClock_Hz);

I couldn't find anything equivalent for UART0 in the said driver. Could someone please help me some advice?

Thanks,

Daniel

Re: UART0 API functions in KSDK v2.0

danielchen — Thu, 22 Dec 2016 07:41:11 GMT

Hi Daniel

The API UART_Init is applied to all UART0, UART1, UART2.

I would suggest you check the following macros when you init UART0, you need to modify them according to your project

<board.h>

#define BOARD_DEBUG_UART_TYPE DEBUG_CONSOLE_DEVICE_TYPE_LPSCI
#define BOARD_DEBUG_UART_BASEADDR (uint32_t) UART0
#define BOARD_DEBUG_UART_CLKSRC kCLOCK_CoreSysClk
#define BOARD_DEBUG_UART_CLK_FREQ CLOCK_GetCoreSysClkFreq()

Regards

Chen

Re: UART0 API functions in KSDK v2.0

danieltruong — Thu, 22 Dec 2016 19:01:21 GMT

Hi Daniel,

Thanks for providing the clues. However, could you elaborate in a little more details as to how I can use these macros to initialize UART0 using UART_Init() function? The best way is perhaps you could upload some example codes to guide me through if you can. Of all the demo examples given by NXP, I could only find UART1 examples but not single one that demonstrates UART0.

Thanks,

Daniel T.

Re: UART0 API functions in KSDK v2.0

danieltruong — Thu, 22 Dec 2016 19:24:49 GMT

Hi Daniel,

Just adding to my comment above to give you some background info. I'm not using FRDM-KL26Z board at this stage anymore. I'm switching to my real board which uses the MKL26Z256VLL4 micro. So UART0 is being used as normal channel to connect to a peripheral device, NOT used as debug channel via OpenSDA as seen in most FRDM- board. With this condition, should I do something (define some macro?) to make UART0 available for "normal mode", as opposed to "debug" mode? I guess all of these questions should be answered if NXP could provide us some example codes for the case of UART0.

Thanks,

Daniel

Re: UART0 API functions in KSDK v2.0

danielchen — Fri, 23 Dec 2016 04:25:03 GMT

Hi Daniel

Thanks for your additional information. For KL26, UART0 is different than UART1 and UART2. Please check the following code for initialize uart0

            lpsci_config_t lpsci_config;
          ...
            LPSCI_GetDefaultConfig(&lpsci_config);
            lpsci_config.baudRate_Bps = baudRate;
            /* Enable clock and initial UART module follow user configure structure. */
            LPSCI_Init();
            LPSCI_EnableTx();
            LPSCI_EnableRx();

You can refer to the fsl_debug_console.c for more information.

(see case DEBUG_CONSOLE_DEVICE_TYPE_LPSCI:)

Regards

Daniel

Re: UART0 API functions in KSDK v2.0

danieltruong — Fri, 23 Dec 2016 19:45:17 GMT

Thank you Daniel C. Your input really helps to open the door for me to solve my problem. With something as basic as this, I wish NXP provided it with some kind of KSDK 2.0 reference manual for the users. Instead, we just don't know the info until we ask around to find out.

Anyway I really appreciate your help.

Have a nice day!

-Daniel T.