[参考译文] LP-EM-CC1354P10：电容式触控功耗

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1431385/lp-em-cc1354p10-capacitive-touch-power-consumption

工具与软件：

您好！

我将以 CC1354的电容式触控为例、在"采用 CC13x2/CC26x2的超低功耗感应应用"文档中、它提到了不采用触控的8.1uA 电流和采用触控的128uA 电流、

我用 Sensor Controller Studio 中的示例尝试了这种情况,并使用 CCS Theia 在一个空的专业喷射中非常简单地实现它:

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/*
 *  ======== empty.c ========
 */
/* For usleep() */
#include <unistd.h>
#include <stdint.h>
#include <stddef.h>


/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/apps/LED.h>
#include "ti_drivers_config.h"
#include "C:\Users\ValentinKUNTI\Documents\Texas Instruments\Sensor Controller Studio\examples\cap_touch_ulpsense\source\scif.h"

// SCIF driver callbacks
void scCtrlReadyCallback(void) {
    // Empty callback for task control interface ready
}

void scTaskAlertCallback(void) {
    // Handle alert interrupt from Sensor Controller
    scifClearAlertIntSource();
    scifAckAlertEvents();
}

void *mainThread(void *arg0) {
    // Array to store touch detection state for each pin
    uint16_t touchState[SCIF_CAPACITIVE_TOUCH_PIN_COUNT] = {0};
    LED_Handle led0Handle = LED_open(CONFIG_LED_0, NULL);
    
    // Initialize drivers
    GPIO_init();
    
    // Initialize SCIF
    scifOsalInit();
    scifOsalRegisterCtrlReadyCallback(scCtrlReadyCallback);
    scifOsalRegisterTaskAlertCallback(scTaskAlertCallback);
    scifInit(&scifDriverSetup);
    
    // Configure capacitive touch parameters
    scifTaskData.capacitiveTouch.cfg.isrcCurrent = 0x0011;     // Set current for touch sensing
    scifTaskData.capacitiveTouch.cfg.maxSmplPeriod = 100;      // Maximum sampling period
    scifTaskData.capacitiveTouch.cfg.minSmplPeriod = 30;       // Minimum sampling period
    
    // Reset task structures (except configuration)
    scifResetTaskStructs(1 << SCIF_CAPACITIVE_TOUCH_TASK_ID, 
                        (1 << SCIF_STRUCT_INPUT) | (1 << SCIF_STRUCT_OUTPUT));
    
    // Start the Capacitive Touch task
    if (scifWaitOnNbl(20000) != SCIF_SUCCESS) {
        // Handle timeout error
        return NULL;
    }
    
    if (scifStartTasksNbl(1 << SCIF_CAPACITIVE_TOUCH_TASK_ID) != SCIF_SUCCESS) {
        // Handle start error
        return NULL;
    }
    
    // Main loop
    while (1) {
        // Check for available output data
        while (scifGetTaskIoStructAvailCount(SCIF_CAPACITIVE_TOUCH_TASK_ID, SCIF_STRUCT_OUTPUT) > 0) {
            // Get pointer to output structure
            SCIF_CAPACITIVE_TOUCH_OUTPUT_T* output = scifGetTaskStruct(SCIF_CAPACITIVE_TOUCH_TASK_ID, SCIF_STRUCT_OUTPUT);
            
            // Read touch detection state
            for (int i = 0; i < SCIF_CAPACITIVE_TOUCH_PIN_COUNT; i++) {
                touchState[i] = output->pTouchDet[i];
            }
            
            // Return the buffer to the Sensor Controller
            scifHandoffTaskStruct(SCIF_CAPACITIVE_TOUCH_TASK_ID, SCIF_STRUCT_OUTPUT);
        }
        
        // Toggle LED based on touch state of first pin
        if (touchState[0]) {
            LED_toggle(led0Handle);
        }
        
        // Small delay
        sleep(1);
    }
    
    return NULL;
}