[参考译文] CC1350：如何实现低功耗 RF 和 SCS UART

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1283545/cc1350-how-to-implement-low-power-rf-and-scs-uart

团队成员、您好。

我希望能生成一个程序、利用 SCS 的 UART 通过 RS485与器件通信、并使用 RF 的 TX 传输数据。

现在我已经确定 SCS 的 UART 可以使用 scifWaitOnNbl(5000000);来降低5秒的功耗。  

但我不知道如何关闭 Cortex-M3。 我已经在 TI 驱动程序示例中查看了 pinstanby，但它似乎是 sleep()；无法满足我的需要。

我希望能得到一些建议、或者如果 SCS UART 的睡眠状态出现错误、那么可以麻烦告诉我。

谢谢、下面提供了代码、希望您能得到最好的建议。

可以解释、它主要是通过 uartTaskInit 和 rfTxTaskInit 之间的交互来进行的

/*
 * Copyright (c) 2019, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/***** Includes *****/
/* Standard C Libraries */
#include <stdlib.h>
#include <unistd.h>

/* TI Drivers */
#include <ti/drivers/rf/RF.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/UART.h>
#include <ti/drivers/uart/UARTCC26XX.h>
/* Driverlib Header files */
#include DeviceFamily_constructPath(driverlib/rf_prop_mailbox.h)

/* Board Header files */
#include "Board.h"

/* Application Header files */
#include "RFQueue.h"
#include "smartrf_settings/smartrf_settings.h"
//#include DeviceFamily_constructPath(inc/hw_fcfg1.h)

//SCS include
#include <ti/devices/DeviceFamily.h>
#include "scif.h"
#include <ti/sysbios/knl/Semaphore.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/BIOS.h>

/***** Defines *****/
#define NO_PACKET              0
#define PACKET_RECEIVED        1

volatile uint8_t packetRxCb;
volatile size_t bytesReadCount;

/* Packet RX Configuration */
#define MAX_LENGTH             240 /* Max length byte the radio will accept */
#define NUM_DATA_ENTRIES       2  /* NOTE: Only two data entries supported at the moment */
#define NUM_APPENDED_BYTES     2  /* The Data Entries data field will contain:
                                   * 1 Header byte (RF_cmdPropRx.rxConf.bIncludeHdr = 0x1)
                                   * Max 30 payload bytes
                                   * 1 status byte (RF_cmdPropRx.rxConf.bAppendStatus = 0x1) */

/* RFQueue */
static dataQueue_t dataQueue;
static rfc_dataEntryGeneral_t* currentDataEntry;
static uint8_t rfRxPacketLength;
static uint8_t* rfRxPacketDataPointer;
static uint8_t rfRxPacket[MAX_LENGTH + NUM_APPENDED_BYTES - 1]; /* The length byte is stored in a separate variable */
static uint8_t rfTxPacket[MAX_LENGTH + NUM_APPENDED_BYTES - 1];

#if defined(__TI_COMPILER_VERSION__)
#pragma DATA_ALIGN (rxDataEntryBuffer, 4);
static uint8_t
rxDataEntryBuffer[RF_QUEUE_DATA_ENTRY_BUFFER_SIZE(NUM_DATA_ENTRIES,
                                                  MAX_LENGTH,
                                                  NUM_APPENDED_BYTES)];
#elif defined(__IAR_SYSTEMS_ICC__)
#pragma data_alignment = 4
static uint8_t
rxDataEntryBuffer[RF_QUEUE_DATA_ENTRY_BUFFER_SIZE(NUM_DATA_ENTRIES,
                                                  MAX_LENGTH,
                                                  NUM_APPENDED_BYTES)];
#elif defined(__GNUC__)
static uint8_t
rxDataEntryBuffer[RF_QUEUE_DATA_ENTRY_BUFFER_SIZE(NUM_DATA_ENTRIES,
                                                  MAX_LENGTH,
                                                  NUM_APPENDED_BYTES)]
                                                  __attribute__((aligned(4)));
#else
#error This compiler is not supported.
#endif

/* UART */
#define MAX_NUM_UART_RX_BYTES    1000
#define MAX_NUM_UART_TX_BYTES    1000

static int uartRxCount;
uint8_t UartRxBuf[MAX_NUM_UART_RX_BYTES];   // Receive buffer
uint8_t UartTxBuf[MAX_NUM_UART_TX_BYTES];   // Transmit buffer

UART_Handle uart;
UART_Params uartParams;

static char input[MAX_NUM_UART_RX_BYTES];
static char output[MAX_NUM_UART_TX_BYTES];
int32_t UARTwrite_semStatus;
int_fast16_t status = UART_STATUS_SUCCESS;
static int i,j;

// Uart TASK DATA
// Task data
static Task_Params uartTaskParams,rfTxTaskParams,rfRxTaskParams;
static Task_Struct uartTaskStruct,rfTxTaskStruct,rfRxTaskStruct;
static Char uartTaskStack[1024],rfTxTaskStack[1024],rfRxTaskStack[1024];


Semaphore_Struct uartTaskSem, rfTxTaskSem, rfRxTaskSem;
Semaphore_Handle uartTaskSemHandle, rfTxTaskSemHandle, rfRxTaskSemHandle;

/* RF handle */
static RF_Object rfObject;
static RF_Handle rfHandle;
static RF_CmdHandle rfTxPostHandle,rfRxPostHandle;
static RF_Params rfParams;

/* LED */
static PIN_Handle ledPinHandle;
static PIN_State ledPinState;

PIN_Config pinTable[] =
{
    Board_PIN_LED1 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
    Board_PIN_LED2 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX,
    PIN_TERMINATE
};

/***** Function definitions *****/
void ReceiveonUARTcallback(UART_Handle handle, void *UartRxBuf, size_t count, void *userArg, int_fast16_t status)
{
    bytesReadCount = count;
}

void led_init()
{
    ledPinHandle = PIN_open(&ledPinState, pinTable);

    PIN_setOutputValue(ledPinHandle, Board_PIN_LED1,!PIN_getOutputValue(Board_PIN_LED1));
    usleep(300000);
    PIN_setOutputValue(ledPinHandle, Board_PIN_LED1,!PIN_getOutputValue(Board_PIN_LED1));

    PIN_setOutputValue(ledPinHandle, Board_PIN_LED2,!PIN_getOutputValue(Board_PIN_LED2));
    usleep(300000);
    PIN_setOutputValue(ledPinHandle, Board_PIN_LED2,!PIN_getOutputValue(Board_PIN_LED2));

    if (ledPinHandle == NULL)
    {
        while(1);
    }
}

void uartTxRfRxPacket()
{
    printf("uartTxRfRxPacket\n");

    if(packetRxCb)
    {
        for(i=0;i<rfRxPacketLength;i++)
        {
            scifUartTxPutChar((char)rfRxPacket[i]);
        }

        packetRxCb = NO_PACKET;

        Semaphore_post(rfRxTaskSemHandle);
    }
}

void ReceivedOnRFcallback(RF_Handle h, RF_CmdHandle ch, RF_EventMask e)
{
    if (e & RF_EventRxEntryDone)
    {
        PIN_setOutputValue(ledPinHandle, Board_PIN_LED2, 1);

        /* Get current unhandled data entry */
        currentDataEntry = RFQueue_getDataEntry(); //loads data from entry

        /* Handle the packet data, located at &currentDataEntry->data:
         * - Length is the first byte with the current configuration
         * - Data starts from the second byte */
        rfRxPacketLength      = *(uint8_t*)(&currentDataEntry->data); //gets the packet length (send over with packet)
        rfRxPacketDataPointer = (uint8_t*)(&currentDataEntry->data + 1); //data starts from 2nd byte

        /* Copy the payload + the status byte to the packet variable */
        memcpy(rfRxPacket, rfRxPacketDataPointer, (rfRxPacketLength + 1));

        /* Move read entry pointer to next entry */
        RFQueue_nextEntry();

        packetRxCb = PACKET_RECEIVED;

        PIN_setOutputValue(ledPinHandle, Board_PIN_LED2, 0);

        uartTxRfRxPacket();
    }
}

void scCtrlReadyCallback(void) {
    printf("scCtrlReadyCallback\n");
} // scCtrlReadyCallback

void scTaskAlertCallback(void) {
    printf("scTaskAlertCallback\n");

    // Clear the ALERT interrupt source
    scifClearAlertIntSource();

    // Echo all characters currently in the RX FIFO
    int rxFifoCount = scifUartGetRxFifoCount();

    uartRxCount = rxFifoCount;

    i = 0;

    while (rxFifoCount--)
    {
        UartRxBuf[i] = (char)scifUartRxGetChar();
        i++;
    }

    // Clear the events that triggered this
    scifUartClearEvents();

    // Acknowledge the alert event
    scifAckAlertEvents();

    if(uartRxCount > 0)
    {
        //開啟rf tx
        Semaphore_post(rfTxTaskSemHandle);
    }

    // Wake up the OS task
    //Semaphore_post(uartTaskSemHandle);
} // scTaskAlertCallback

// CRC計算函數
uint16_t calculateCRC(uint8_t *data, int length) {
    uint16_t crc = 0xFFFF;

    for (i = 0; i < length; i++) {
        crc ^= data[i];
        for (j = 0; j < 8; j++) {
            if (crc & 0x0001) {
                crc >>= 1;
                crc ^= 0xA001; // 16位CRC多項式
            } else {
                crc >>= 1;
            }
        }
    }
    return crc;
}

void scUartTask(UArg a0, UArg a1) {

    printf("scUartTask start\n");
    // Initialize the Sensor Controller
    scifOsalInit();
    scifOsalRegisterCtrlReadyCallback(scCtrlReadyCallback);
    scifOsalRegisterTaskAlertCallback(scTaskAlertCallback);
    scifInit(&scifDriverSetup);

    //scifStartRtcTicksNow(0x00010000 / 8);

    uint8_t command[] = { 0x01, 0x04, 0x00, 0x00, 0x00, 0x0A};
    int commandLength = sizeof(command) / sizeof(command[0]);

    uint16_t crc = calculateCRC(command, commandLength);

    // 將CRC檢驗碼附加到數據報文
    command[commandLength] = crc & 0xFF; // 低位字節
    command[commandLength + 1] = (crc >> 8) & 0xFF; // 高位字節
    int newCommandLength = commandLength + 2;

    while(1)
    {
        //printf("Uart restart\n");
        // Start the UART emulator
        scifResetTaskStructs((1 << SCIF_UART_EMULATOR_TASK_ID), (1 << SCIF_STRUCT_CFG) | (1 << SCIF_STRUCT_INPUT) | (1 << SCIF_STRUCT_OUTPUT));
        scifExecuteTasksOnceNbl(1 << SCIF_UART_EMULATOR_TASK_ID);

        // Enable baud rate generation
        scifUartSetBaudRate(9600);

        // Enable RX (10 idle bit periods required before enabling start bit detection)
        scifUartSetRxFifoThr(SCIF_UART_RX_FIFO_MAX_COUNT / 2);
        scifUartSetRxTimeout(10 * 2);
        scifUartSetRxEnableReqIdleCount(10 * 2);
        scifUartRxEnable(1);

        // Enable events (half full RX FIFO or 10 bit period timeout
        scifUartSetEventMask(BV_SCIF_UART_ALERT_RX_FIFO_ABOVE_THR | BV_SCIF_UART_ALERT_RX_BYTE_TIMEOUT);

        //printf("wait 0.5s\n");
        scifWaitOnNbl(500000);

        // 使用循環將整個帶CRC檢驗碼的數據報文傳輸到UART
        for (i = 0; i < newCommandLength; i++) {
            scifUartTxPutChar(command[i]);
        }

        //printf("scUartTask wait for semaphore post\n");

        // Wait for an ALERT callback
        //Semaphore_pend(uartTaskSemHandle, BIOS_WAIT_FOREVER);


        //printf("wait 0.5s\n");
        scifWaitOnNbl(500000);
        //printf("scifUartStopEmulator\n");
        scifUartStopEmulator();

        scifUartSetBaudRate(0);

        //printf("wait 5s\n");
        scifWaitOnNbl(500000);
    }

} // taskFxn

void uartTaskInit()
{
    //Initialize Uart semaphore
    Semaphore_construct(&uartTaskSem, 0, NULL);
    uartTaskSemHandle = Semaphore_handle(&uartTaskSem);

    // Configure the Uart task
    Task_Params_init(&uartTaskParams);
    uartTaskParams.stack = uartTaskStack;
    uartTaskParams.stackSize = sizeof(uartTaskStack);
    uartTaskParams.priority = 2;
    Task_construct(&uartTaskStruct, scUartTask, &uartTaskParams, NULL);
}

void rfTxTask()
{
    //RF_Params_init(&rfTxParams);

    // TX指令參數設定
    RF_cmdPropTx.pPkt = rfTxPacket;
    RF_cmdPropTx.startTrigger.triggerType = TRIG_NOW;

    //rfTxHandle = RF_open(&rfTxObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup, &rfTxParams);

    //設定頻率
    //RF_postCmd(rfTxHandle, (RF_Op*)&RF_cmdFs, RF_PriorityNormal, NULL, 0);

    while(1)
    {
        printf("rfTxTask wait for semaphore post\n");

        Semaphore_pend(rfTxTaskSemHandle, BIOS_WAIT_FOREVER);

        if(uartRxCount > 0)
        {
            RF_cmdPropTx.pktLen = uartRxCount;

            int i;

            for(i=0; i<uartRxCount; i++)
            {
                rfTxPacket[i] = UartRxBuf[i];
            }

            /*for(i=0;i<sizeof(rfTxPacket);i++)
            {
                printf("%c\n",rfTxPacket[i]);
            }*/

            RF_cancelCmd(rfHandle, rfRxPostHandle, 1);

            PIN_setOutputValue(ledPinHandle, Board_PIN_LED1, 1);

            RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropTx, RF_PriorityNormal, NULL, 0);

            PIN_setOutputValue(ledPinHandle, Board_PIN_LED1, 0);

            rfRxPostHandle = RF_postCmd(rfHandle, (RF_Op*)&RF_cmdPropRx,RF_PriorityNormal, &ReceivedOnRFcallback,RF_EventRxEntryDone);

            uartRxCount = 0;

            for(i=0;i<sizeof(UartRxBuf);i++)
            {
                UartRxBuf[i] = '\0';
            }
        }
    }
}

void rfTxTaskInit()
{
    //Initialize RFTx semaphore
    Semaphore_construct(&rfTxTaskSem, 0, NULL);
    rfTxTaskSemHandle = Semaphore_handle(&rfTxTaskSem);

    // Configure the RFTx task
    Task_Params_init(&rfTxTaskParams);
    rfTxTaskParams.stack = rfTxTaskStack;
    rfTxTaskParams.stackSize = sizeof(rfTxTaskStack);
    rfTxTaskParams.priority = 1;
    Task_construct(&rfTxTaskStruct, rfTxTask, &rfTxTaskParams, NULL);
}

void rfInit()
{
    RF_Params_init(&rfParams);

    rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup, &rfParams);

    //設定頻率
    RF_postCmd(rfHandle, (RF_Op*)&RF_cmdFs, RF_PriorityNormal, NULL, 0);
}

void *mainThread(void *arg0)
{
    while(ledPinHandle == NULL)
    {
        led_init();
    }

    uartTaskInit();

    rfInit();

    rfTxTaskInit();
}

此致、

银河