[参考译文] CC1354P10：为输入边沿计时模式设置 PinMux

你(们)好、Satya

您需要选择 PINCC26XX_setMux ()；而不是 PINCC26XX_setMux、因为不再支持引脚驱动程序。

BR

Siri

我制作了下面的简单代码、并且能够按预期读取定时器值：

#include <unistd.h>
#include <stdint.h>
#include <stddef.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/timer/GPTimerCC26XX.h>

#include "ti_drivers_config.h"

GPTimerCC26XX_Handle hTimer;
GPTimerCC26XX_Params timerParams;

uint32_t edgeCount_1 = 0;
uint32_t edgeCount_2 = 0;
bool edge1 = true;

void buttonCallbackFunction(uint_least8_t index) {

    // Simple debounce logic
    CPUdelay((uint32_t)((48000000/3)*0.050f));
    GPIO_toggle(CONFIG_GPIO_LED_GREEN);
}

void timerCallback(GPTimerCC26XX_Handle handle, GPTimerCC26XX_IntMask interruptMask)
{

    GPIO_write(CONFIG_GPIO_LED_RED, 1);
    if (edge1)
    {
        edgeCount_1 = GPTimerCC26XX_getValue(handle);
        edge1 = false;
    }
    else
    {
        edgeCount_2 = GPTimerCC26XX_getValue(handle);
        edge1 = true;
    }
    GPIO_write(CONFIG_GPIO_LED_RED, 0);
}

void *mainThread(void *arg0)
{
    GPIO_init();

    // Toggle the RLED the BTN-1 toggles (pushed and released)
    // RLED is connected to the input CONFIG_GPIO_EDGE_INPUT (DIO0) which is connected to the GPTimer
    GPIO_setConfig(CONFIG_GPIO_BTN1, GPIO_CFG_IN_PU | GPIO_CFG_IN_INT_BOTH_EDGES);
    GPIO_setCallback(CONFIG_GPIO_BTN1, buttonCallbackFunction);
    GPIO_enableInt(CONFIG_GPIO_BTN1);

    GPTimerCC26XX_Params_init(&timerParams);
    timerParams.mode = GPT_MODE_EDGE_TIME;
    timerParams.width = GPT_CONFIG_16BIT;
    timerParams.direction = GPTimerCC26XX_DIRECTION_UP;
    timerParams.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;

    hTimer = GPTimerCC26XX_open(CONFIG_GPTIMER_0, &timerParams);

    GPTimerCC26XX_registerInterrupt(hTimer, timerCallback, GPT_INT_CAPTURE);

    GPTimerCC26XX_PinMux pinMux = GPTimerCC26XX_getPinMux(hTimer);

    GPIO_setConfigAndMux(CONFIG_GPIO_EDGE_INPUT,(GPIO_CFG_INPUT_INTERNAL | GPIO_CFG_PULL_NONE_INTERNAL), pinMux);

    GPTimerCC26XX_setCaptureEdge(hTimer, GPTimerCC26XX_BOTH_EDGES);

    GPTimerCC26XX_start(hTimer);
    while (1);
}

计时器在捕获到事件后没有重新启动/变为零。

计时器从0开始计数到0xFFFF、然后再次从0开始计数。

在48MHz 下从0到0xFFFF 计数只需1.36ms

当您尝试测量宽度为1ms 的脉冲时、只有在  同一"计数周期"内捕获到 edgeCount_1和 edgeCount_2、才能获得正确的值(48000)

如果您运行下面的代码、在确保 edgeCount_1 < edgeCount_2时、您将看到 DIFF = 48000。

void timerCallback(GPTimerCC26XX_Handle handle, GPTimerCC26XX_IntMask interruptMask)
{
    if (edge1)
    {
        edgeCount_1 = GPTimerCC26XX_getValue(handle);
        edge1 = false;
    }
    else
    {
        edgeCount_2 = GPTimerCC26XX_getValue(handle);
        edge1 = true;

        if(edgeCount_1 < edgeCount_2)
        {
            diff = edgeCount_2 - edgeCount_1;
        }
    }
}

void *mainThread(void *arg0)
{
    GPIO_init();

    GPTimerCC26XX_Params_init(&timerParams);
    timerParams.mode = GPT_MODE_EDGE_TIME;
    timerParams.width = GPT_CONFIG_16BIT;
    timerParams.direction = GPTimerCC26XX_DIRECTION_UP;
    timerParams.debugStallMode = GPTimerCC26XX_DEBUG_STALL_OFF;

    hTimer = GPTimerCC26XX_open(CONFIG_GPTIMER_0, &timerParams);

    GPTimerCC26XX_registerInterrupt(hTimer, timerCallback, GPT_INT_CAPTURE);

    GPTimerCC26XX_PinMux pinMux = GPTimerCC26XX_getPinMux(hTimer);

    GPIO_setConfigAndMux(CONFIG_GPIO_EDGE_INPUT,(GPIO_CFG_INPUT_INTERNAL | GPIO_CFG_PULL_NONE_INTERNAL), pinMux);

    GPTimerCC26XX_setCaptureEdge(hTimer, GPTimerCC26XX_BOTH_EDGES);

    GPTimerCC26XX_start(hTimer);
    while (1);
}

Siri

您需要使用 GPTimerCC26XX_setLoadValue 来写入 TAPR 寄存器。

您可以看到如何在 GPTimerCC26XX.c 中访问/使用它

/*!
 *  @brief  Shared code to be used by GPTimerCC26XX_setLoadValue / GPTimerCC26XX_setMatchValue
 *          Sets load/match values using input value and register offset for
 *          prescaler and load/match register
 *          Functions calling this should specifiy which the register offset
 *          within the module base to the corresponding timer A register.
 */
static void GPTimerCC26XXSetLoadMatch(GPTimerCC26XX_Handle handle,
                                      GPTimerCC26XX_Value loadMatchVal,
                                      uint32_t regPre,
                                      uint32_t regLoadMatch)
{
    /* Get the pointer to the object and hwAttrs */
    GPTimerCC26XX_HWAttrs const *hwAttrs = handle->hwAttrs;
    GPTimerCC26XX_Object *object         = handle->object;
    uint32_t offset                      = GPT_LUT[handle->timerPart].offset;

    /* Split value into correct timer and prescaler register for 16 bit modes. */
    if (object->width == GPT_CONFIG_16BIT)
    {
        /* Upper byte is used by prescaler */
        uint8_t prescaleValue = 0xFF & (loadMatchVal >> 16);
        /* Discard upper byte (24 bits max) */
        loadMatchVal &= 0xFFFF;

        /* Set prescale value */
        HWREG(hwAttrs->baseAddr + offset + regPre) = prescaleValue;
    }

    /* Set load / match value */
    HWREG(hwAttrs->baseAddr + offset + regLoadMatch) = loadMatchVal;
}

/*!
 *  @brief  Set GPTimer load value. For 32-bit configuration all 32 bits can
 *          be used. For split mode / 16-bit mode maximum value is 24 bits.
 *          Function concatenates prescaler functionality automatically
 */
void GPTimerCC26XX_setLoadValue(GPTimerCC26XX_Handle handle, GPTimerCC26XX_Value loadValue)
{
    GPTimerCC26XXSetLoadMatch(handle, loadValue, GPT_O_TAPR, GPT_O_TAILR);
}

Siri

感谢您的持续支持。