TI CC2541的LED控制

现在终于进入到蓝牙SPI的环节了, 下面还要研究I2C, 所以第一步, 先点灯, 就是GPIO控制吧.

参考一下LEd的初始化:

void HalLedInit (void)
{
#if (HAL_LED == TRUE)
  HalLedSet(HAL_LED_ALL, HAL_LED_MODE_OFF);  // Initialize all LEDs to OFF.
  // Set LED GPIOs to outputs.
  LED1_DDR |= LED1_BV;
#if (!defined HAL_PA_LNA && !defined HAL_PA_LNA_CC2590)
  LED2_DDR |= LED2_BV;
#if (!defined CC2540_MINIDK && !defined HAL_BOARD_CC2540USB)
  LED3_DDR |= LED3_BV;
#endif
#endif
#if defined BLINK_LEDS
  HalLedStatusControl.sleepActive = FALSE;  // Initialize sleepActive to FALSE.
#endif
#endif
}

其中重要的两句是:

  HalLedSet(HAL_LED_ALL, HAL_LED_MODE_OFF);  // Initialize all LEDs to OFF.
  // Set LED GPIOs to outputs.
  LED1_DDR |= LED1_BV;

先看看怎么把GPIO脚P1_0定义为输出

/* 1 - Green */
#define LED1_BV                        BV(0)
#define LED1_SBIT                      P1_0
#define LED1_DDR                       P1DIR
#define LED1_POLARITY                  ACTIVE_HIGH

/* Port 1                                                                           */
SFRBIT( P1      ,  0x90, P1_7, P1_6, P1_5, P1_4, P1_3, P1_2, P1_1, P1_0 )
SFR(  RFIRQF1   ,  0x91  )   /*  RF Interrupt Flags MSB                             */
SFR(  DPS       ,  0x92  )   /*  Data Pointer Select                                */
SFR(  MPAGE     ,  0x93  )   /*  Memory Page Select                                 */
SFR(  T2CTRL    ,  0x94  )   /*  Timer2 Control Register                            */
SFR(  ST0       ,  0x95  )   /*  Sleep Timer 0                                      */
SFR(  ST1       ,  0x96  )   /*  Sleep Timer 1                                      */
SFR(  ST2       ,  0x97  )   /*  Sleep Timer 2                                      */

#define LED1_DDR                       P1DIR

SFR(  P1DIR     ,  0xFE  )   /*  Port 1 Direction                                   */

所以, LED1_DDR |= LED1_BV;  //即: 将SFR 0XFE的值, 或一个00000000.

在看看

HalLedSet(HAL_LED_ALL, HAL_LED_MODE_OFF);

其实重点是:
      led = HAL_LED_1;
      leds &= HAL_LED_ALL;
      sts = HalLedStatusControl.HalLedControlTable;

      while (leds)
      {
        if (leds & led)
        {
          if (mode != HAL_LED_MODE_TOGGLE)
          {
            sts->mode = mode;  /* ON or OFF */
          }
          else
          {
            sts->mode ^= HAL_LED_MODE_ON;  /* Toggle */
          }
          HalLedOnOff (led, sts->mode);
          leds ^= led;
        }
        led <<= 1;
        sts++;
      }

一开始其实是不是不用写得好像它那么高深莫测, 简单实现以下, 知道如何输出0, 1, 就是第一步的目标. 对吧.

ok, let's rock!