ZigBee学习笔记_HalDriverInit()_1

看名字是初始化一些硬件驱动,里面全都是调用一些子函数来实现,包括TIMER、ADC、DMA、FLASH等等,如下

void HalDriverInit (void)
{
  /* TIMER */
#if (defined HAL_TIMER) && (HAL_TIMER == TRUE)
  HalTimerInit();
#endif

  /* ADC */
#if (defined HAL_ADC) && (HAL_ADC == TRUE)
  HalAdcInit();
#endif

  /* DMA */
#if (defined HAL_DMA) && (HAL_DMA == TRUE)
  // Must be called before the init call to any module that uses DMA.
  HalDmaInit();
#endif

  /* Flash */
#if (defined HAL_FLASH) && (HAL_FLASH == TRUE)
  // Must be called before the init call to any module that uses Flash access or NV.
  HalFlashInit();
#endif

  /* AES */
#if (defined HAL_AES) && (HAL_AES == TRUE)
  HalAesInit();
#endif

 
  /* LED */
#if (defined HAL_LED) && (HAL_LED == TRUE)
  HalLedInit();
#endif

  /* UART */
#if (defined HAL_UART) && (HAL_UART == TRUE)
  HalUARTInit();
#endif

  /* KEY */
#if (defined HAL_KEY) && (HAL_KEY == TRUE)
  HalKeyInit();
#endif

  /* SPI */
#if (defined HAL_SPI) && (HAL_SPI == TRUE)
  HalSpiInit();
#endif
   /* LCD */
#if (defined HAL_LCD) && (HAL_LCD == TRUE)
  HalLcdInit();
#endif

}

宏定义如下

/* Set to TRUE enable H/W TIMER usage, FALSE disable it */
#ifndef HAL_TIMER
#define HAL_TIMER FALSE
#endif

/* Set to TRUE enable ADC usage, FALSE disable it */
#ifndef HAL_ADC
#define HAL_ADC TRUE
#endif

/* Set to TRUE enable DMA usage, FALSE disable it */
#ifndef HAL_DMA
#define HAL_DMA TRUE
#endif

/* Set to TRUE enable Flash access, FALSE disable it */
#ifndef HAL_FLASH
#define HAL_FLASH TRUE
#endif

/* Set to TRUE enable AES usage, FALSE disable it */
#ifndef HAL_AES
#define HAL_AES TRUE
#endif

#ifndef HAL_AES_DMA
#define HAL_AES_DMA TRUE
#endif

/* Set to TRUE enable LCD usage, FALSE disable it */
#ifndef HAL_LCD
#define HAL_LCD TRUE
#endif

/* Set to TRUE enable LED usage, FALSE disable it */
#ifndef HAL_LED
#define HAL_LED TRUE
#endif
#if (!defined BLINK_LEDS) && (HAL_LED == TRUE)
#define BLINK_LEDS
#endif

/* Set to TRUE enable KEY usage, FALSE disable it */
#ifndef HAL_KEY
#define HAL_KEY TRUE
#endif

/* Set to TRUE enable UART usage, FALSE disable it */
#ifndef HAL_UART
#if (defined ZAPP_P1) || (defined ZAPP_P2) || (defined ZTOOL_P1) || (defined ZTOOL_P2)
#define HAL_UART  TRUE
#else
#define HAL_UART FALSE
#endif
#endif

可以看到除了TIMER和UART以外其他宏定义均是TRUE,在定时器服务的初始化中涉及到的是定时器1、3、4,查看代码

void HalTimerInit (void)
{
  T1CCTL0 = 0;    /* Make sure interrupts are disabled */
  T1CCTL1 = 0;    /* Make sure interrupts are disabled */
  T1CCTL2 = 0;    /* Make sure interrupts are disabled */
  T3CCTL0 = 0;    /* Make sure interrupts are disabled */
  T3CCTL1 = 0;    /* Make sure interrupts are disabled */
  T4CCTL0 = 0;    /* Make sure interrupts are disabled */
  T4CCTL1 = 0;    /* Make sure interrupts are disabled */

  /* Setup prescale & clock for timer0 */
  halTimerRecord[HW_TIMER_1].prescale    = HAL_TIMER1_16_PRESCALE;
  halTimerRecord[HW_TIMER_1].clock       = HAL_TIMER_32MHZ;
  halTimerRecord[HW_TIMER_1].prescaleVal = HAL_TIMER1_16_PRESCALE_VAL;

  /* Setup prescale & clock for timer2 */
  halTimerRecord[HW_TIMER_3].prescale    = HAL_TIMER3_8_PRESCALE;
  halTimerRecord[HW_TIMER_3].clock       = HAL_TIMER_32MHZ;
  halTimerRecord[HW_TIMER_3].prescaleVal = HAL_TIMER3_8_PRESCALE_VAL;

  /* Setup prescale & clock for timer3 */
  halTimerRecord[HW_TIMER_4].prescale    = HAL_TIMER4_8_PRESCALE;
  halTimerRecord[HW_TIMER_4].clock       = HAL_TIMER_32MHZ;
  halTimerRecord[HW_TIMER_4].prescaleVal = HAL_TIMER4_8_PRESCALE_VAL;

  /* Setup Timer1 Channel structure */
  halTimerChannel[HW_TIMER_1].TxCCTL =  TCHN_T1CCTL;
  halTimerChannel[HW_TIMER_1].TxCCL =   TCHN_T1CCL;
  halTimerChannel[HW_TIMER_1].TxCCH =   TCHN_T1CCH;
  halTimerChannel[HW_TIMER_1].TxOVF =   TCNH_T1OVF;
  halTimerChannel[HW_TIMER_1].ovfbit =  TCHN_T1OVFBIT;
  halTimerChannel[HW_TIMER_1].intbit =  TCHN_T1INTBIT;
……
}


定时器3、4的配置与定时器1相同,节省下空间,都是一些寄存器的配置,先看下宏定义吧

#define HW_TIMER_1        0x00
#define HW_TIMER_3        0x01
#define HW_TIMER_4        0x02
#define HW_TIMER_INVALID  0x03
#define HW_TIMER_MAX      0x03

#define HAL_TIMER1_16_PRESCALE      HAL_TIMER1_16_TC_DIV128
#define HAL_TIMER1_16_PRESCALE_VAL  128
#define HAL_TIMER3_8_PRESCALE       HAL_TIMER34_8_TC_DIV128
#define HAL_TIMER3_8_PRESCALE_VAL   128
#define HAL_TIMER4_8_PRESCALE       HAL_TIMER34_8_TC_DIV128
#define HAL_TIMER4_8_PRESCALE_VAL   128

#define HAL_TIMER1_16_TC_DIV128   0x0c  /* Clock pre-scaled by 128 */
#define HAL_TIMER34_8_TC_DIV128   0xE0  /* Clock pre-scaled by 128 */

/* Clock settings */
#define HAL_TIMER_16MHZ           16
#define HAL_TIMER_32MHZ           32

/* Default all timers to use channel 0 */
#define TCHN_T1CCTL   &(X_T1CCTL0)
#define TCHN_T1CCL    &(X_T1CC0L)
#define TCHN_T1CCH    &(X_T1CC0H)
#define TCNH_T1OVF    &(X_TIMIF)
#define TCHN_T1OVFBIT TIMIF_T1OVFIM
#define TCHN_T1INTBIT IEN1_T1IE

貌似有点多看着,而且这里面还用到了一个halTimerRecord数组和一个halTimerChannel数组,查看下其定义

typedef struct
{
  bool configured;
  bool intEnable;
  uint8 opMode;
  uint8 channel;
  uint8 channelMode;
  uint8 prescale;
  uint8 prescaleVal;
  uint8 clock;
  halTimerCBack_t callBackFunc;
} halTimerSettings_t;

typedef struct
{
  uint8 volatile XDATA *TxCCTL;
  uint8 volatile XDATA *TxCCH;
  uint8 volatile XDATA *TxCCL;
  uint8 volatile XDATA *TxOVF;
  uint8 ovfbit;
  uint8 intbit;
} halTimerChannel_t;

/*********************************************************************
 * GLOBAL VARIABLES
 */
static halTimerSettings_t halTimerRecord[HW_TIMER_MAX];
static halTimerChannel_t  halTimerChannel[HW_TIMER_MAX];

用这两个数组管理者三个定时器,跟定时器1相关的寄存器有以下几个

ZigBee学习笔记_HalDriverInit()_1_第1张图片

T1CNTH和T1CNTL没啥可说的,保存16位计数值,T1CCnH和T1CCnL是保存通道的捕获/比较16位数值,T1CTL是定时器1的控制寄存器,T1STAT是定时器1的状态寄存器如下

ZigBee学习笔记_HalDriverInit()_1_第2张图片

ZigBee学习笔记_HalDriverInit()_1_第3张图片

T1CTL管理定时器的分频以及工作模式,T1STAT是一些中断标志位,T1CCTLn是各个通道的捕获/比较控制器,在这里是一个重要的寄存器,T3CTL分频占了3位略微有点区别。ZigBee学习笔记_HalDriverInit()_1_第4张图片

该寄存器配置通道的使能、模式选择(比较模式还是捕获模式),模式的控制(两个模式的配置),寄存器一目了然,看代码才是王道,首先是屏蔽通道中断,然后配置时钟分频器,对于定时器1来说取得值是0x0c,对比与T1CTL来说就是128分频,而后设置适中源32MHz,对于prescaleVal目前还不清楚是做啥子的,赋值为128,定时器3和定时器4也是128分频,时钟源是32MHz,但这只是为这个结构体赋值了,并没有对具体的寄存器赋值还。接着是设置定时器通道结构体,默认都是通道0,这里用到了两个寄存器如下

ZigBee学习笔记_HalDriverInit()_1_第5张图片

ZigBee学习笔记_HalDriverInit()_1_第6张图片

都是一些中断标志位,这段代码里就将结构体与寄存器联系在一起了,他的定义用的是寄存器。HalTimerInit()函数只是一些定时器的配置,也没有啥是性质东西,不过那两个结构体要搞清楚方便管理定时器。

接下来看一哈HalAdcInit()这个函数,同样只是一些简单的配置

void HalAdcInit (void)
{
#if (HAL_ADC == TRUE)
  volatile uint8  tmp;

  ADCCON1 = HAL_ADC_STSEL | HAL_ADC_RAND_GEN | 0x03;
  ADCCON2 = HAL_ADC_REF_VOLT | HAL_ADC_DEC_RATE | HAL_ADC_SCHN;
  /*
  *  After reset, the first ADC reading of the extra conversion always reads GND level.
  *  We will do a few dummy conversions to bypass this bug.
  */
  tmp = ADCL;     /* read ADCL,ADCH to clear EOC */
  tmp = ADCH;
  ADCCON3 = HAL_ADC_REF_VOLT | HAL_ADC_DEC_RATE | HAL_ADC_ECHN;
  while ((ADCCON1 & HAL_ADC_EOC) != HAL_ADC_EOC);   /* Wait for conversion */
  tmp = ADCL;     /* read ADCL,ADCH to clear EOC */
  tmp = ADCH;
  ADCCON3 = HAL_ADC_REF_VOLT | HAL_ADC_DEC_RATE | HAL_ADC_ECHN;
  while ((ADCCON1 & HAL_ADC_EOC) != HAL_ADC_EOC);   /* Wait for conversion */
  tmp = ADCL;     /* read ADCL,ADCH to clear EOC */
  tmp = ADCH;
#endif
}

ADC一共三个寄存器ADCCON1、ADCCON2以及ADCCON3,其中ADCCON3在供电检测的时候用到过了,

ZigBee学习笔记_HalDriverInit()_1_第7张图片

ZigBee学习笔记_HalDriverInit()_1_第8张图片

ADCCON1主要用于控制,启动ADC转换,ADCCON2主要是配置,

#define HAL_ADC_STSEL       HAL_ADC_STSEL_ST
#define HAL_ADC_RAND_GEN    HAL_ADC_RAND_STOP
#define HAL_ADC_REF_VOLT    HAL_ADC_REF_AVDD
#define HAL_ADC_DEC_RATE    HAL_ADC_DEC_064
#define HAL_ADC_SCHN        HAL_ADC_CHN_VDD3
#define HAL_ADC_ECHN        HAL_ADC_CHN_GND

#define HAL_ADC_STSEL_ST    0x30    /* ADCCON1.ST =1 Trigger */
#define HAL_ADC_RAND_STOP   0x0c    /* Stop Random Generator */
#define HAL_ADC_REF_AVDD    0x80    /* AVDD_SOC Pin Reference */
#define HAL_ADC_DEC_064     0x00    /* Decimate by 64 : 8-bit resolution */
#define HAL_ADC_CHN_VDD3    0x0f    /* VDD/3 */
#define HAL_ADC_CHN_GND     0x0c    /* GND */
#define HAL_ADC_EOC         0x80    /* End of Conversion bit */

进入该函数首先是一个判断,第一条语句是设置利用ADCCON1的ST位启动一个新的转换序列,关闭16位随机数发生器,最后两位保留写1。第二条语句设置序列转换的参考电压为AVDD5引脚(他给的注释是与CC2430相符合的,貌似注释都是沿用CC2430的,)唉!64抽取率,序列通道为VDD/3(也就是单个ADC转换了),读取ADCL、ADCH。设置ADCCON3选择用于额外转换的参考电压为AVDD5,64抽取率,通道为GND,当转换完成时,读取转换结果,后面又进行了一次转换,看其注释说道,重启之后,首先对ADC的外部转换都是GND level,所以在这里做了几次转换来避过这个bug。

下面看一下DMA的初始化,这个代码更简短

void HalDmaInit( void )
{
  HAL_DMA_SET_ADDR_DESC0( &dmaCh0 );
  HAL_DMA_SET_ADDR_DESC1234( dmaCh1234 );
#if (HAL_UART_DMA || \
   ((defined HAL_SPI) && (HAL_SPI == TRUE))  || \
   ((defined HAL_IRGEN) && (HAL_IRGEN == TRUE)))
  DMAIE = 1;
#endif
}

DMA有5个通道,3个可配置的DMA通道优先级,32个可配置的传送触发事件等等,DMA的状态图如下

ZigBee学习笔记_HalDriverInit()_1_第9张图片


用户需要为每一个通道配置以下几个参数:源地址、目标地址、传送长度,可变长度(VLEN)、优先级别、触发事件、源地址和目标地址增量、传送模式、字节传送或字传送、中断屏蔽以及M8,参数有点多貌似。

#define HAL_DMA_SET_ADDR_DESC0( a ) \
  st( \
    DMA0CFGH = (uint8)( (uint16)(a) >> 8 );  \
    DMA0CFGL = (uint8)( (uint16)(a) );       \
  )

#define HAL_DMA_SET_ADDR_DESC1234( a ) \
  st( \
    DMA1CFGH = (uint8)( (uint16)(a) >> 8 );  \
    DMA1CFGL = (uint8)( (uint16)(a) );       \
  )

这里只是为DMA赋值为通道n的配置数据结构的开始地址,通道0与通道1234是分开的,其结构如下

typedef struct {
  uint8 srcAddrH;
  uint8 srcAddrL;
  uint8 dstAddrH;
  uint8 dstAddrL;
  uint8 xferLenV;
  uint8 xferLenL;
  uint8 ctrlA;
  uint8 ctrlB;
} halDMADesc_t;

更细致的DMA操作还是等到后面再学习吧。




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