diff options
Diffstat (limited to 'nuttx/arch/arm/src/sama5/sam_adc.c')
| -rw-r--r-- | nuttx/arch/arm/src/sama5/sam_adc.c | 182 |
1 files changed, 156 insertions, 26 deletions
diff --git a/nuttx/arch/arm/src/sama5/sam_adc.c b/nuttx/arch/arm/src/sama5/sam_adc.c index c34ff0ef4..4249a44ab 100644 --- a/nuttx/arch/arm/src/sama5/sam_adc.c +++ b/nuttx/arch/arm/src/sama5/sam_adc.c @@ -74,23 +74,42 @@ struct sam_adc_s { + /* Debug stuff */ + +#ifdef CONFIG_SAMA5_ADC_REGDEBUG + bool wrlast; /* Last was a write */ + uintptr_t addrlast; /* Last address */ + uint32_t vallast; /* Last value */ + int ntimes; /* Number of times */ +#endif }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ +/* Register operations ******************************************************/ + +#if defined(CONFIG_SAMA5_ADC_REGDEBUG) && defined(CONFIG_DEBUG) +static bool sam_adc_checkreg(struct sam_gmac_s *priv, bool wr, + uint32_t regval, uintptr_t address); +static uint32_t sam_adc_getreg(struct sam_gmac_s *priv, uintptr_t addr); +static void sam_adc_putreg(struct sam_gmac_s *priv, uintptr_t addr, uint32_t val); +#else +# define sam_adc_getreg(priv,addr) getreg32(addr) +# define sam_adc_putreg(priv,addr,val) putreg32(val,addr) +#endif /* ADC interrupt handling */ -static int adc_interrupt(int irq, void *context); +static int sam_adc_interrupt(int irq, void *context); /* ADC methods */ -static void adc_reset(FAR struct adc_dev_s *dev); -static int adc_setup(FAR struct adc_dev_s *dev); -static void adc_shutdown(FAR struct adc_dev_s *dev); -static void adc_rxint(FAR struct adc_dev_s *dev, bool enable); -static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg); +static void sam_adc_reset(FAR struct adc_dev_s *dev); +static int sam_adc_setup(FAR struct adc_dev_s *dev); +static void sam_adc_shutdown(FAR struct adc_dev_s *dev); +static void sam_adc_rxint(FAR struct adc_dev_s *dev, bool enable); +static int sam_adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg); /**************************************************************************** * Private Data @@ -100,11 +119,11 @@ static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg); static const struct adc_ops_s g_adcops = { - .ao_reset = adc_reset, - .ao_setup = adc_setup, - .ao_shutdown = adc_shutdown, - .ao_rxint = adc_rxint, - .ao_ioctl = adc_ioctl, + .ao_reset = sam_adc_reset, + .ao_setup = sam_adc_setup, + .ao_shutdown = sam_adc_shutdown, + .ao_rxint = sam_adc_rxint, + .ao_ioctl = sam_adc_ioctl, }; /* ADC internal state */ @@ -126,15 +145,112 @@ static struct adc_dev_s g_adcdev = ****************************************************************************/ /**************************************************************************** - * Name: adc_reset + * Name: sam_adc_checkreg + * + * Description: + * Check if the current register access is a duplicate of the preceding. + * + * Input Parameters: + * regval - The value to be written + * address - The address of the register to write to + * + * Returned Value: + * true: This is the first register access of this type. + * flase: This is the same as the preceding register access. + * + ****************************************************************************/ + +#ifdef CONFIG_SAMA5_ADC_REGDEBUG +static bool sam_adc_checkreg(struct sam_gmac_s *priv, bool wr, + uint32_t regval, uintptr_t address) +{ + if (wr == priv->wrlast && /* Same kind of access? */ + regval == priv->vallast && /* Same value? */ + address == priv->addrlast) /* Same address? */ + { + /* Yes, then just keep a count of the number of times we did this. */ + + priv->ntimes++; + return false; + } + else + { + /* Did we do the previous operation more than once? */ + + if (priv->ntimes > 0) + { + /* Yes... show how many times we did it */ + + lldbg("...[Repeats %d times]...\n", priv->ntimes); + } + + /* Save information about the new access */ + + priv->wrlast = wr; + priv->vallast = regval; + priv->addrlast = address; + priv->ntimes = 0; + } + + /* Return true if this is the first time that we have done this operation */ + + return true; +} +#endif + +/**************************************************************************** + * Name: sam_adc_getreg + * + * Description: + * Read any 32-bit register using an absolute address. + * + ****************************************************************************/ + +#ifdef CONFIG_SAMA5_ADC_REGDEBUG +static uint32_t sam_adc_getreg(struct sam_gmac_s *priv, uintptr_t address) +{ + uint32_t regval = getreg32(address); + + if (sam_adc_checkreg(priv, false, regval, address)) + { + lldbg("%08x->%08x\n", address, regval); + } + + return regval; +} +#endif + +/**************************************************************************** + * Name: sam_adc_putreg + * + * Description: + * Write to any 32-bit register using an absolute address. + * + ****************************************************************************/ + +#ifdef CONFIG_SAMA5_ADC_REGDEBUG +static void sam_adc_putreg(struct sam_gmac_s *priv, uintptr_t address, + uint32_t regval) +{ + if (sam_adc_checkreg(priv, true, regval, address)) + { + lldbg("%08x<-%08x\n", address, regval); + } + + putreg32(regval, address); +} +#endif + +/**************************************************************************** + * Name: sam_adc_reset * * Description: * Reset the ADC device. Called early to initialize the hardware. This - * is called, before adc_setup() and on error conditions. + * is called, before sam_adc_setup() and on error conditions. * ****************************************************************************/ -static void adc_reset(FAR struct adc_dev_s *dev) +static void sam_adc_reset(FAR struct adc_dev_s *dev) { FAR struct sam_adc_s *priv = (FAR struct sam_adc_s *)dev->ad_priv; irqstate_t flags; @@ -147,7 +263,7 @@ static void adc_reset(FAR struct adc_dev_s *dev) } /**************************************************************************** - * Name: adc_setup + * Name: sam_adc_setup * * Description: * Configure the ADC. This method is called the first time that the ADC @@ -157,14 +273,14 @@ static void adc_reset(FAR struct adc_dev_s *dev) * ****************************************************************************/ -static int adc_setup(FAR struct adc_dev_s *dev) +static int sam_adc_setup(FAR struct adc_dev_s *dev) { FAR struct sam_adc_s *priv = (FAR struct sam_adc_s *)dev->ad_priv; int ret; /* Attach the ADC interrupt */ - ret = irq_attach(SAM_IRQ_ADC, adc_interrupt); + ret = irq_attach(SAM_IRQ_ADC, sam_adc_interrupt); if (ret < 0) { adbg("ERROR: Failed to attach IRQ %d: %d\n", SAM_IRQ_ADC, ret); @@ -178,7 +294,7 @@ static int adc_setup(FAR struct adc_dev_s *dev) } /**************************************************************************** - * Name: adc_shutdown + * Name: sam_adc_shutdown * * Description: * Disable the ADC. This method is called when the ADC device is closed. @@ -186,7 +302,7 @@ static int adc_setup(FAR struct adc_dev_s *dev) * ****************************************************************************/ -static void adc_shutdown(FAR struct adc_dev_s *dev) +static void sam_adc_shutdown(FAR struct adc_dev_s *dev) { FAR struct sam_adc_s *priv = (FAR struct sam_adc_s *)dev->ad_priv; @@ -203,14 +319,14 @@ static void adc_shutdown(FAR struct adc_dev_s *dev) } /**************************************************************************** - * Name: adc_rxint + * Name: sam_adc_rxint * * Description: * Call to enable or disable RX interrupts * ****************************************************************************/ -static void adc_rxint(FAR struct adc_dev_s *dev, bool enable) +static void sam_adc_rxint(FAR struct adc_dev_s *dev, bool enable) { FAR struct sam_adc_s *priv = (FAR struct sam_adc_s *)dev->ad_priv; @@ -226,14 +342,14 @@ static void adc_rxint(FAR struct adc_dev_s *dev, bool enable) } /**************************************************************************** - * Name: adc_ioctl + * Name: sam_adc_ioctl * * Description: * All ioctl calls will be routed through this method * ****************************************************************************/ -static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg) +static int sam_adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg) { /* No ioctl commands supported */ @@ -241,14 +357,14 @@ static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg) } /**************************************************************************** - * Name: adc_interrupt + * Name: sam_adc_interrupt * * Description: * ADC interrupt handler * ****************************************************************************/ -static int adc_interrupt(int irq, void *context) +static int sam_adc_interrupt(int irq, void *context) { FAR struct sam_adc_s *priv = (FAR struct sam_adc_s *)g_adcdev.ad_priv; uint32_t regval; @@ -273,8 +389,22 @@ static int adc_interrupt(int irq, void *context) * ****************************************************************************/ -FAR struct adc_dev_s *sam_adcinitialize(void) +FAR struct adc_dev_s *sam_adc_initialize(void) { + /* Enable the ADC peripheral clock*/ + + sam_adc_enableclk(); + + /* Reset the ADC controller */ + + sam_adc_putreg(priv, SAM_ADC_CR, ADC_CR_SWRST); + + /* Reset Mode Register */ + + sam_adc_putreg(priv, SAM_ADC_MR, 0); + + /* Return a pointer to the device structure */ + return &g_adcdev; } |