米6体育平台手机版

SWRA578B October 2017 – April 2020 CC1312PSIP , CC1312R , CC1314R10 , CC1352P , CC1352P7 , CC1352R , CC2620 , CC2630 , CC2640 , CC2640R2F-Q1 , CC2642R , CC2642R-Q1 , CC2650MODA , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP

A.2 SPI Transfer – System CPU

The SPI transfer example is created in the following way:

Open a spimaster_CCXXX2X1_LAUNCHXL_tirtos_ccs project in CCS, for example spimaster_CC1312R1_LAUNCHXL_tirtos_ccs.
Replace the spimaster.c with the following code:

#include <string.h> 
/* Driver Header files */ 
#include <ti/drivers/GPIO.h> 
#include <ti/drivers/SPI.h> 
#include <ti/sysbios/knl/Task.h> 
#include <ti/sysbios/knl/Clock.h> 
#include <ti/sysbios/knl/Semaphore.h> 
#include <ti/sysbios/BIOS.h> 
/* Driver configuration */ 
#include "ti_drivers_config.h"  

#define WAKEUPFREQUENCY 100 
#define SPI_MSG_LENGTH  (18) 
#define MASTER_MSG      ("Texas Instruments!") 
unsigned char masterTxBuffer[SPI_MSG_LENGTH]; 
Semaphore_Struct semLedTask; 
Semaphore_Params semParams; 
void spiCallback(SPI_Handle spiHandle, SPI_Transaction *transaction); 

SPI_Handle      spiHandle; 
SPI_Params      spiParams; 
SPI_Transaction transaction;  

/* ======== mainThread ======== */ 
void *mainThread(void *arg0) {     
    SPI_init();
    SPI_Params_init(&spiParams); 
    spiParams.bitRate = 1000000; 
    spiParams.transferMode = SPI_MODE_CALLBACK;
    spiParams.transferCallbackFxn = spiCallback; 

    strncpy((char *) masterTxBuffer, MASTER_MSG, SPI_MSG_LENGTH); 
    transaction.count = SPI_MSG_LENGTH; 
    transaction.txBuf = (void *) masterTxBuffer; 

     // Create the semaphore used to wait for Sensor Controller ALERT events 
     Semaphore_Params_init(&semParams); 
    semParams.mode = Semaphore_Mode_BINARY; 
    Semaphore_construct(&semLedTask, 0, &semParams); 

    while(1){ 
        spiHandle = SPI_open(CONFIG_SPI_MASTER, &spiParams); 
        SPI_transfer(spiHandle, &transaction); 

        Semaphore_pend(Semaphore_handle(&semLedTask), BIOS_WAIT_FOREVER); 
        SPI_close(spiHandle); 

        Task_sleep((1000000/WAKEUPFREQUENCY) / Clock_tickPeriod);
    } 
}

void spiCallback(SPI_Handle spiHandle, SPI_Transaction *transactions){ 
    Semaphore_post(Semaphore_handle(&semLedTask));
}

Open spimaster.syscfg.
In the SPI driver, under the “Use Hardware” configurable, select “None”.
In the PinMux configurable in the SPI driver, select pin DIO25, DIO26 and DIO27 for SCLK, MISO and MOSI, respectively, to make sure the SPI does not interface with the external flash on the Launchpad.
In the GPIO driver, remove all defined pins to make sure no pins are left floating.