[经验]

CC2541的捕获功能配置示例

南风一号

2016-4-12 10:19:57

2145

CC2541的捕获功能配置示例

很多人不懂如何配置CC2541的捕获功能，下面直接给出配置示例，小白都可以看懂~

#define BIT7                      0x80
#define BIT6                      0x40
#define BIT5                      0x20
#define BIT4                      0x10
#define BIT3                      0x08
#define BIT2                      0x04
#define BIT1                      0x02
#define BIT0                      0x01

#define T1CCTLn_IM                0x40          // Interrupt mask. Enables interrupt request when set.

// T1STAT (0xAF) - timer 1 Status
#define T1STAT_OVFIF                   0x20 // Overflow interrupt flag
#define T1STAT_CH4IF                   0x10 // Overflow interrupt flag
#define T1STAT_CH3IF                   0x08 // Overflow interrupt flag
#define T1STAT_CH2IF                   0x04 // Overflow interrupt flag
#define T1STAT_CH1IF                   0x02 // Overflow interrupt flag
#define T1STAT_CH0IF                   0x01 // Overflow interrupt flag

#define T1CTL_MODE                      (0x03)
#define T1CTL_DIV                      (0x0C)
#define T1CTL_MODE_FREERUN             (0x01)
#define T1CTL_DIV_32                   (0x02 << 2)
#define T1CCTLn_CAP_RISE_EDGE          (0x01)       // Capture on rising edge
#define T1CCTLn_CAP_FALL_EDGE          (0x02)       // Capture on falling edge
#define T1CCTLn_CAP_BOTH_EDGE          (0x03)       // Capture on both edges
#define T1CCTLn_MODE                   0x04       // Compare mode when set, capture mode when cleared
#define T1CCTLn_CAP                      (0x03)       // Capture mode bit mask
#define P2DIR_PRIP0_T1_0_1             (0x02 << 6) // Timer 1 channels 0-1 has priority, then USART 1, then USART 0, then Timer 1 channels 2-3
#define P2DIR_PRIP0_T1_2_3             (0x03 << 6)

void timer1_Init_2_3(void)

{
// Select P0_5 for peripheral function.
P0SEL |= BIT5;    //选择P0_5的外设功能

P2DIR |= P2DIR_PRIP0_T1_2_3;

T1STAT &= ~T1STAT_CH3IF;

   // Set individual interrupt enable bit in the peripherals SFR.
T1CCTL0 &= ~T1CCTLn_IM; // Displayable interrupt on channel 0.
T1CCTL1 &= ~T1CCTLn_IM; // Disable interrupt on channel 1.
T1CCTL2 &= ~T1CCTLn_IM; // Disable interrupt on channel 2.
T1CCTL3 |= T1CCTLn_IM; // Enable interrupt on channel 3.
T1CCTL4 &= ~T1CCTLn_IM;    // Disable  interrupt on channel 4.
T1OVFIM = 0;             // Disable overflow interrupt.

// Enable Timer 1 interrupts by setting [IEN1.T1IE=1].
T1IE = 1;

// Enable global interrupt by setting the [IEN0.EA=1].
EA = 1;

   // Select capture mode [T1CCTLn.MODE = 0], and set capture mode to capture on both edge.
T1CCTL3 = (T1CCTL3 & ~(T1CCTLn_CAP | T1CCTLn_MODE)) | T1CCTLn_CAP_BOTH_EDGE;

// Set prescalar divider value to 32 to get a tickspeed of 500 kHz and
// set Timer 1 to free running mode.
T1CTL = (T1CTL & ~(T1CTL_MODE | T1CTL_DIV)) | T1CTL_MODE_FREERUN | T1CTL_DIV_32;

// Timer 1 will now start counting...

}