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CC2540, UART1 UART (without flow control), Alt.2

Vasiliy Bogatov
Expert 1500 points

Other Parts Discussed in Thread: CC2540

Hi All,

Use CC2540 in custom board, RF part work properly and can communicate with TI iPhone 5 utility.

I'm debuging digital communication part. As reference I use "SimpleBLEPeripheral". My custom board is identical to CC2540 USB dongle, instead pins of CC2540: P1_7, P1_6 connected to Stellaris UART (PA1,PA0 respectively). I don't want use flow control. (see schematic below for clarification)

I want just send to Uart 1, some peace of data. Here is my way:

1. In options of "SimpleBLEPeripheral" 

INT_HEAP_LEN=3072
HALNODEBUG
OSAL_CBTIMER_NUM_TASKS=1
HAL_AES_DMA=TRUE
HAL_DMA=TRUE
xPOWER_SAVING
PLUS_BROADCASTER
HAL_LCD=FALSE
HAL_LED=FALSE
HAL_UART
HAL_UART_DMA=2
xCC2540_MINIDK

2. In "void SimpleBLEPeripheral_Init( uint8 task_id )" I/O and UART configurations:

// IO Config
P0SEL = 0; // Configure Port 0 as GPIO
P1SEL = 0; // Configure Port 1 as GPIO
P2SEL = 0; // Configure Port 2 as GPIO

P0DIR = 0xFF;//P0DIR = 0xFC; // Port 0 pins P0.0 and P0.1 as input (buttons),
// all others (P0.2-P0.7) as output
P1DIR = 0xFF; // All port 1 pins (P1.0-P1.7) as output
P2DIR = 0xEF; // All port 1 pins (P2.0-P2.4) as output

P0 = 0;//P0 = 0x03; // All pins on port 0 to low except for P0.0 and P0.1 (buttons)
P1 = 0; // All pins on port 1 to low
P2 = 0; // All pins on port 2 to low

// Configure UART1 for Alternative 2 => Port P1 (PERCFG.U1CFG = 1)
PERCFG |= 0x02;
// P1SEL.SELP1_4/5/6/7 = 1 => CT = P1_4, RT = P1_5, TX = P1_6, RX = P1_7
P1SEL |= 0xC0;
// Configure relevant Port P0 pins back to GPIO function
// P0SEL &= ~0x3C;

// UART Config
halUARTcfg.configured = TRUE;
halUARTcfg.baudRate = HAL_UART_BR_115200;
halUARTcfg.flowControl = FALSE;
halUARTcfg.flowControlThreshold = 48;
halUARTcfg.rx.maxBufSize = 128;
halUARTcfg.tx.maxBufSize = 128;
halUARTcfg.idleTimeout = 6;
halUARTcfg.intEnable = TRUE;
halUARTcfg.callBackFunc = NULL;//sbpSerialPacketParser; // Call-back function

(void)HalUARTOpen( HAL_UART_PORT_1, &halUARTcfg );

3. In "static void performPeriodicTask( void )" function:

HalUARTWrite(HAL_UART_PORT_1,"qwerty",2);

P1^=0x02; //blink LED

I can see blinking led, but oscilloscope show "0" on TX (P1_6) of CC2540

Please any advice. Why data is not transmited throw UART1?

  • 0
    Guru 735695 points

    I do not see problems in your UART code. However, you do not fill RX callback function. I do not know if this will cause your problem but you can fill it and have another test. If your UART is correctly configured, the TX(P1_6) should be "1" (high status). Do you want to disconnect P1_6 from PA0 and use scope to have a look? Check the TX status, is it high or low to make sure your SW and HW are no problem first.

  • 0 in reply to YiKai Chen
    Expert 1500 points

    Hi YiKai,

    Thanks for reply. I've just added highlighted text and TX of CC2540 works fine now:

    INT_HEAP_LEN=3072
    HALNODEBUG
    OSAL_CBTIMER_NUM_TASKS=1
    HAL_AES_DMA=TRUE
    HAL_DMA=TRUE
    xPOWER_SAVING
    PLUS_BROADCASTER
    HAL_LCD=FALSE
    HAL_LED=FALSE
    HAL_UART=TRUE
    HAL_UART_DMA=2
    xCC2540_MINIDK

    This gives ability properly tune drivers in "void HalDriverInit (void)" function (file "hal_drivers.c"):

    ..

    /* UART */
    #if (defined HAL_UART) && (HAL_UART == TRUE)
    HalUARTInit();
    #endif

    ..

    As you can see without assign TRUE to HAL_UART HalUARTInit isn't called at all.

  • 0 in reply to Vasiliy Bogatov
    Prodigy 10 points

    Hi Varsity,

    I am working on a project about BLE and uart communication. I also use uart1 in alternative 2 location, P1_6. I tried your method but it does not work. Would you mind email me the whole project file? My email address is henry123456236@gmail.com. Thank you!

  • 0 in reply to Vasiliy Bogatov
    Prodigy 50 points

    Hi Vasiliy,

    I am using a CC2540EM to connect to an external MCU with my own modified SimpleBLECentral coding. However I keep on getting the same error: PERCFG, P0SEL, etc. are undefined. If I use them in SimpleBLEPeripheral I do not get this error. I really need to get this code going but I seem to be missing an include file or library or something. If possible can anyone please assist me in this matter it would be much appreciated.

    Regards
    Ruart

    EDIT 1: I fixed it

  • 0 in reply to Ruart Crous
    Prodigy 50 points

    Hello Ruart, do you still have you project files?

    Is it possible for you to share them with me? I need to setup a UART communication in a short period of time and I would appreciate your help a lot !

    Thanks.