\/\/example_gptimer_capture.c<\/p>\n\n\n\n
include \"example.h\"<\/p>\n\n\n\n
static uint32_t capture_VAL[20];
static uint8_t capture_idx = 0;
static uint8_t capture_en = 0;<\/p>\n\n\n\n
volatile uint16_t testUpdateCnt = 0;<\/p>\n\n\n\n
int global_autoload; \/\/timer\u4e2dautoload\u7684\u503c
\/\/ \u8ba1\u7b97\u4e24\u6b21\u83b7\u53d6\u5230\u7684\u65f6\u95f4\u5dee\uff0c\u7528\u4ee5\u8ba1\u7b97\u4e00\u4e2a\u8f93\u5165\u5468\u671f\u7684\u957f\u5ea6
int getLastTimeInterval(uint32_t curCount)
{
static uint32_t s_lastTimeCount = 0;
uint32_t ret;
if (curCount >= s_lastTimeCount) {
ret = curCount - s_lastTimeCount;
} else {
ret = global_autoload - s_lastTimeCount + curCount;
}
s_lastTimeCount = curCount;
return ret;
}<\/p>\n\n\n\n
void GPTIMER2_isr(void)
{
\/\/\u8f93\u5165\u6ce2\u5f62\u89e6\u53d1\u7684\u4e2d\u65ad
if (GPTIMER_IsActiveFlagCC1(GPTIMER2) == true)
{
uint32_t value = GPTIMER_IC_GetCapture(GPTIMER2, GPTIMER_CHANNEL_CH1);
capture_VAL[capture_idx++] = getLastTimeInterval(value); \/\/\u8ba1\u7b97\u548c\u4e0a\u6b21\u4e4b\u95f4\u7684\u5dee\u503c<\/p>\n\n\n\n
\/\/\u91c7\u96c620\u6b21\u5c31\u505c\u6389\uff0c\u5728\u540e\u8fb9\u6765\u5206\u6790
if(capture_idx >= 20)
{
GPTIMER_DisableIntCC1(GPTIMER2);
GPTIMER_DisableIntUpdate(GPTIMER2);
capture_en = 1;
capture_idx = 0;
}
GPTIMER_ClearFlagCC1(GPTIMER2);
}<\/p>\n\n\n\n
else if (GPTIMER_IsActiveFlagUpdate(GPTIMER2) == true)
{
\/\/\u5982\u679c\u8fde\u7eed\u8fdb\u5230\u8fd9\u91cc\uff0c\u5219\u662f\u8f93\u5165\u8109\u51b2\u505c\u6389\u4e86
\/\/to do...
testUpdateCnt++;
GPTIMER_ClearFlagUpdate(GPTIMER2);
}<\/p>\n\n\n\n
}<\/p>\n\n\n\n
\/\/\u8ba1\u7b97\u6355\u83b7\u7684\u9891\u7387
int get_captureFrequency(void)
{
uint32_t average, sum = 0;<\/p>\n\n\n\n
if (capture_en == 1)
{
\/\/\u53d6\u4e2d\u95f4\u768410\u4e2a\uff0c\u8ba1\u7b97\u5e73\u5747\u503c
for (int i = 5; i < 15; i++)
{
sum += capture_VAL[i];
}
average = sum \/ 10;
printf(\"Testing capture average = %d\\r\\n\", average);
\/\/\u8f93\u5165pwm\u7684\u9891\u7387\uff0c\u4e3a timer\u7684\u4e3b\u9891 \/ clk\u8ba1\u6570
uint32_t timerFreq, inFreq;
timerFreq = SYS_GetPclkFreq() \/ 1;
inFreq = timerFreq \/ average;
\/\/\u91cd\u65b0\u5f00\u542f\u65b0\u7684\u91c7\u96c6
capture_en = 0;
GPTIMER_EnableIntCC1(GPTIMER2);
GPTIMER_EnableIntUpdate(GPTIMER2);
return inFreq;
}
return 0;<\/p>\n\n\n\n
}<\/p>\n\n\n\n
\/\/\u4f8b\u7a0b\uff1a
\/\/ \u542f\u52a8\u4e00\u4e2atimer\u8f93\u5165\u6355\u83b7capture\u6765\u6355\u83b7\u4e0a\u5347\u6cbf\uff0c\u7136\u540e\u7528\u53e6\u4e00\u4e2atimer\u5f00\u542f\u4e00\u4e2apwm\u8f93\u51fa\u3002
\/\/ \u7136\u540e\u5c06\u8fd9\u4e24\u4e2apin\u811a\u77ed\u63a5\uff0c\u7528\u4ee5\u6d4b\u8bd5\u8fd9\u91cc\u7684\u6355\u83b7\u3002
\/\/VE\u91cc\u9700\u8981\u914d\u5957\u8bbe\u7f6e\uff1a
\/\/ GPTIMER4_CH0 PIN_85
\/\/ GPTIMER2_CH1 PIN_87:INPUT
\/\/
extern void TestGpTimerPwm();
void TestGpTimerCapture()
{
SYS_EnableAPBClock(APB_MASK_GPTIMER2);
GPTIMER_InitTypeDef tm_init;
GPTIMER_StructInit(&tm_init);
tm_init.Autoreload = SYS_GetPclkFreq(); \/\/\u8fd9\u91cc\u914d\u7f6e\u7684\u6570\u503c\uff0c\u8981\u5927\u4e8e\u8f93\u5165\u6ce2\u5f62\u7684\u5468\u671f\u3002\u5728\u4e0d\u5206\u9891\u60c5\u51b5\u4e0b\uff0c\u8fd9\u91cc\u8bbe\u7f6e\u6210sysClk\uff0c\u5c31\u662f1\u79d2\u6765\u4e00\u6b21update\u4e2d\u65ad
tm_init.Prescaler = 0; \/\/10 - 1; \/\/\u5982\u679c\u8bbe\u7f6e10\u5206\u9891\uff0c\u662f\u8bbe\u7f6e\u6355\u83b7timer\u7684\u65f6\u949f\u4e3asysclk\u76841\/10
GPTIMER_Init(GPTIMER2, &tm_init);<\/p>\n\n\n\n
global_autoload = tm_init.Autoreload; \/\/\u7528\u4e8e\u65f6\u95f4\u8ba1\u7b97\u91cc\u7684\u8ba1\u6570\u6ea2\u51fa<\/p>\n\n\n\n
GPTIMER_IC_InitTypeDef ic_init;
ic_init.ICPolarity = GPTIMER_IC_POLARITY_FALLING; \/\/\u8f93\u5165\u901a\u9053\u89e6\u53d1\u65b9\u5f0f\uff1a\u4e0a\u5347\u6cbf\u3001\u4e0b\u964d\u6cbf\u3001\u53cc\u8fb9
ic_init.ICMode = GPTIMER_ICMODE_DIRECTTI; \/\/\u6620\u5c04\u5230T1\u4e0a
ic_init.ICPrescaler = GPTIMER_ICPSC_DIV1; \/\/\u914d\u7f6e\u8f93\u5165\u5206\u914d\u3002DIV1\u4e3a\u4e0d\u5206\u9891\u3002
ic_init.ICFilter = GPTIMER_IC_FILTER_FDIV1; \/\/\u8bbe\u7f6e\u8f93\u5165\u6ee4\u6ce2\u5668,\u9632\u6296\u52a8\u3002FDIV1\u4e3a\u4e0d\u6ee4\u6ce2
GPTIMER_IC_Init(GPTIMER2, GPTIMER_CHANNEL_CH1, &ic_init);
GPIO_AF_ENABLE(GPTIMER2_CH1); \/\/\u8f93\u5165IO<\/p>\n\n\n\n
INT_EnableIRQ(GPTIMER2_IRQn, TIMER_PRIORITY); \/\/\u6253\u5f00\u4e2d\u65ad
GPTIMER_EnableIntUpdate(GPTIMER2); \/\/\u4f7f\u80fd\u66f4\u65b0\u4e2d\u65ad\u3002\u5982\u679c\u4e2d\u65ad\u4e2d\u6765\u7684\u662f\u66f4\u65b0\u4e2d\u65ad\uff08\u800c\u4e0d\u662f\u6355\u83b7\u4e2d\u65ad\uff09\uff0c\u8bf4\u660e\u8109\u51b2\u592a\u5bbd\u4e86\u3002
GPTIMER_EnableIntCC1(GPTIMER2); \/\/\u4f7f\u80fd\u6355\u83b7\u4e2d\u65ad<\/p>\n\n\n\n
GPTIMER_EnableCounter(GPTIMER2);<\/p>\n\n\n\n
\/\/test
TestGpTimerPwm(); \/\/\u5f00\u542f\u53e6\u4e00\u4e2a\u5f15\u811a\u7684pwm\u8f93\u51fa\u3002\u5c06\u4e24\u5f15\u811a\u77ed\u63a5\uff0cpwm\u7684\u8f93\u51fa\u4f5c\u4e3a\u8fd9\u91cc\u7684\u8f93\u5165\u3002<\/p>\n\n\n\n
int ret = 0;
while (1)
{
UTIL_IdleUs(1000e3);
ret = get_captureFrequency();
printf(\"calc freq = %d, testUpdateCnt = %d\\r\\n\", ret, testUpdateCnt);
}<\/p>\n\n\n\n
}<\/p>\n","protected":false},"excerpt":{"rendered":"
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