diff options
author | Gregory Nutt <gnutt@nuttx.org> | 2013-10-28 10:08:12 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2013-10-28 10:08:12 -0600 |
commit | 022d45602666fd6966d721dde9635a62d8c56898 (patch) | |
tree | 210d028db3590d3069f1e2c268c1680a18f58b5c /nuttx | |
parent | 252a9031e7e0c68d880273550358ab32008bbd12 (diff) | |
download | px4-nuttx-022d45602666fd6966d721dde9635a62d8c56898.tar.gz px4-nuttx-022d45602666fd6966d721dde9635a62d8c56898.tar.bz2 px4-nuttx-022d45602666fd6966d721dde9635a62d8c56898.zip |
SAMA5 ADC: Seems functional in all modes including DMA
Diffstat (limited to 'nuttx')
-rw-r--r-- | nuttx/ChangeLog | 4 | ||||
-rw-r--r-- | nuttx/arch/arm/src/sama5/Kconfig | 4 | ||||
-rw-r--r-- | nuttx/arch/arm/src/sama5/sam_adc.c | 158 | ||||
-rw-r--r-- | nuttx/configs/sama5d3x-ek/README.txt | 33 | ||||
-rw-r--r-- | nuttx/drivers/analog/Kconfig | 36 | ||||
-rw-r--r-- | nuttx/drivers/analog/adc.c | 2 | ||||
-rw-r--r-- | nuttx/include/nuttx/analog/adc.h | 2 |
7 files changed, 179 insertions, 60 deletions
diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog index 614b9b89f..d63386c38 100644 --- a/nuttx/ChangeLog +++ b/nuttx/ChangeLog @@ -5900,4 +5900,8 @@ is called as part of a failed pthread startup before the flags field in the TCB has been initialized, then a crash occurs. Pointed out by David Sidrane (2013-10-27) + * arch/arm/src/sama5/sam_adc.c: ADC now works in all implemented + modes: single channel or multiple channel with sequencer support. + software trigger or timer trigger; ADC channel interrupts or + DMA (2013-10-28). diff --git a/nuttx/arch/arm/src/sama5/Kconfig b/nuttx/arch/arm/src/sama5/Kconfig index e9f3eb914..7595f9387 100644 --- a/nuttx/arch/arm/src/sama5/Kconfig +++ b/nuttx/arch/arm/src/sama5/Kconfig @@ -1697,12 +1697,12 @@ config SAMA5_ADC_DMASAMPLES The DMA logic uses ping-pong buffers, so the total buffering requirement will be - 2 Buffers * Number_of_ADC_Channels * SAMA5_ADC_DMASAMPLES * sizeof(uint32_t) + 2 Buffers * Number_of_ADC_Channels * SAMA5_ADC_DMASAMPLES * sizeof(uint16_t) So, for example, if you had 8 ADC channels and 8 triggers per DMA transfer, then the total DMA buffering requirment would be: - 2 * 8 * 8 * 4 = 512 bytes. + 2 * 8 * 8 * 2 = 256 bytes. config SAMA5_ADC_AUTOCALIB bool "ADC auto-calibration" diff --git a/nuttx/arch/arm/src/sama5/sam_adc.c b/nuttx/arch/arm/src/sama5/sam_adc.c index 512e1fe29..f2b7b2bb1 100644 --- a/nuttx/arch/arm/src/sama5/sam_adc.c +++ b/nuttx/arch/arm/src/sama5/sam_adc.c @@ -418,8 +418,8 @@ struct sam_adc_s /* DMA sample data buffer */ #ifdef CONFIG_SAMA5_ADC_DMA - uint32_t evenbuf[SAMA5_ADC_SAMPLES]; - uint32_t oddbuf[SAMA5_ADC_SAMPLES]; + uint16_t evenbuf[SAMA5_ADC_SAMPLES]; + uint16_t oddbuf[SAMA5_ADC_SAMPLES]; #endif #endif /* SAMA5_ADC_HAVE_CHANNELS */ @@ -451,6 +451,7 @@ static void sam_adc_dmadone(void *arg); static void sam_adc_dmacallback(DMA_HANDLE handle, void *arg, int result); static int sam_adc_dmasetup(struct sam_adc_s *priv, FAR uint8_t *buffer, size_t buflen); +static void sam_adc_dmastart(struct sam_adc_s *priv); #endif /* ADC interrupt handling */ @@ -609,7 +610,8 @@ static bool sam_adc_checkreg(struct sam_adc_s *priv, bool wr, static void sam_adc_dmadone(void *arg) { struct sam_adc_s *priv = (struct sam_adc_s *)arg; - uint32_t *buffer; + uint16_t *buffer; + uint16_t *next; uint16_t sample; int chan; int i; @@ -617,20 +619,58 @@ static void sam_adc_dmadone(void *arg) avdbg("ready=%d enabled=%d\n", priv->enabled, priv->ready); ASSERT(priv != NULL && !priv->ready); - /* If the DMA is disabled, just ignore the data */ + /* If the DMA transfer is not enabled, just ignore the data (and do not start + * the next DMA transfer). + */ - if (!priv->enabled) + if (priv->enabled) { - /* Select the completed DMA buffer */ + /* Toggle to the next buffer. + * + * buffer - The buffer on which the DMA has just completed + * next - The buffer in which to start the next DMA + */ + + if (priv->odd) + { + buffer = priv->oddbuf; + next = priv->evenbuf; + priv->odd = false; + } + else + { + buffer = priv->evenbuf; + next = priv->oddbuf; + priv->odd = true; + } + + /* Restart the DMA conversion as quickly as possible using the next + * buffer. + * + * REVISIT: In the original design, toggling the ping-pong buffers and + * restarting the DMA was done in the interrupt handler so that the + * next buffer could be filling while the current buffer is being + * processed here on the worker thread. But, unfortunately, + * sam_adcm_dmasetup() cannot be called from an interrupt handler. + * + * A consequence of this is that there is a small window from the time + * that the last set of samples was taken, the worker thread runs, and + * the follow logic restarts the DMA in which samples could be lost! + * + * Without the interrupt level DMA restart logic, there is not really + * any good reason to support the ping-poing buffers at all. + */ + + sam_adc_dmasetup(priv, (FAR uint8_t *)next, + SAMA5_ADC_SAMPLES * sizeof(uint16_t)); - buffer = priv->odd ? priv->evenbuf : priv->oddbuf; /* Invalidate the DMA buffer so that we are guaranteed to reload the * newly DMAed data from RAM. */ cp15_invalidate_dcache((uintptr_t)buffer, - (uintptr_t)buffer + SAMA5_ADC_SAMPLES * sizeof(uint32_t)); + (uintptr_t)buffer + SAMA5_ADC_SAMPLES * sizeof(uint16_t)); /* Process each sample */ @@ -639,7 +679,7 @@ static void sam_adc_dmadone(void *arg) /* Get the sample and the channel number */ chan = (int)((*buffer & ADC_LCDR_CHANB_MASK) >> ADC_LCDR_CHANB_SHIFT); - sample = (uint16_t)((*buffer & ADC_LCDR_DATA_MASK) >> ADC_LCDR_DATA_SHIFT); + sample = ((*buffer & ADC_LCDR_DATA_MASK) >> ADC_LCDR_DATA_SHIFT); /* And give the sample data to the ADC upper half */ @@ -654,6 +694,26 @@ static void sam_adc_dmadone(void *arg) #endif /**************************************************************************** + * Name: sam_adc_dmastart + * + * Description: + * Initiate DMA sampling. + * + ****************************************************************************/ + +static void sam_adc_dmastart(struct sam_adc_s *priv) +{ + /* Make sure that the worker is available and that DMA is not disabled */ + + if (priv->ready && priv->enabled) + { + priv->odd = false; /* Start with the even buffer */ + sam_adc_dmasetup(priv, (FAR uint8_t *)priv->evenbuf, + SAMA5_ADC_SAMPLES * sizeof(uint16_t)); + } +} + +/**************************************************************************** * Name: sam_adc_dmacallback * * Description: @@ -670,22 +730,28 @@ static void sam_adc_dmacallback(DMA_HANDLE handle, void *arg, int result) int ret; allvdbg("ready=%d enabled=%d\n", priv->enabled, priv->ready); - - /* Check of the bottom half is keeping up with us */ + DEBUGASSERT(priv->ready); + + /* Check of the bottom half is keeping up with us. + * + * ready == false: Would mean that the worker thready has not ran since + * the the last DMA callback. + * enabled == false: Means that the upper half has asked us nicely to stop + * transferring DMA data. + */ if (priv->ready && priv->enabled) { - /* Toggle to the next buffer. Note that the toggle only occurs if - * the bottom half is ready to accept more data. Otherwise, we - * will get a data overrun and just re-use the last buffer. + /* Verify that the worker is available */ + + DEBUGASSERT(priv->work.worker == NULL); + + /* Mark the work as busy and schedule the DMA done processing to + * occur on the worker thread. */ - priv->odd = !priv->odd; priv->ready = false; - /* Transfer processing to the bottom half */ - - DEBUGASSERT(priv->work.worker == NULL); ret = work_queue(HPWORK, &priv->work, sam_adc_dmadone, priv, 0); if (ret != 0) { @@ -693,11 +759,20 @@ static void sam_adc_dmacallback(DMA_HANDLE handle, void *arg, int result) } } - /* Restart the DMA conversion using the next buffer */ - - sam_adc_dmasetup(priv->dma, - priv->odd ? (void *)priv->oddbuf : (void *)priv->evenbuf, - SAMA5_ADC_SAMPLES * sizeof(uint32_t)); + /* REVISIT: There used to be logic here to toggle the ping-pong buffers and + * to restart the DMA conversion. This would allow refilling one buffer + * while the worker processes the other buffer that was just filled. But, + * unfortunately, sam_adcm_dmasetup() and dma_rxsetup cannot be called + * from an interrupt handler. + * + * A consequence of this is that there is a small window from the time + * that the last set of samples was taken, the worker thread runs, and the + * logic on the worker thread restarts the DMA. Samples trigger during + * this window will be be lost! + * + * Without this logic, there is not really any strong reason to support + * the ping-poing buffers at all. + */ } #endif @@ -1015,17 +1090,18 @@ static int sam_adc_setup(struct adc_dev_s *dev) sam_adc_autocalibrate(priv); #ifdef CONFIG_SAMA5_ADC_DMA - /* Configure for DMA transfer */ + /* Initiate DMA transfers */ + + priv->ready = true; /* Worker is avaiable */ + priv->enabled = true; /* Transfers are enabled */ - priv->odd = false; - priv->ready = true; - priv->enabled = false; + sam_adc_dmastart(priv); - sam_adc_dmasetup(priv, (void *)priv->evenbuf, SAMA5_ADC_SAMPLES); #else /* Enable end-of-conversion interrupts for all enabled channels. */ sam_adc_putreg(priv, SAM_ADC_IER, SAMA5_CHAN_ENABLE); + #endif /* Configure trigger mode and start conversion */ @@ -1048,11 +1124,12 @@ static void sam_adc_shutdown(struct adc_dev_s *dev) avdbg("Shutdown\n"); - /* Disable ADC interrupts, both at the level of the ADC device and at the - * level of the AIC. - */ + /* Reset the ADC peripheral */ + + sam_adc_reset(dev); + + /* Disable ADC interrupts at the level of the AIC */ - sam_adc_putreg(priv, SAM_ADC_IDR, ADC_INT_ALL); up_disable_irq(SAM_IRQ_ADC); /* Then detach the ADC interrupt handler. */ @@ -1075,9 +1152,20 @@ static void sam_adc_rxint(struct adc_dev_s *dev, bool enable) avdbg("enable=%d\n", enable); #ifdef CONFIG_SAMA5_ADC_DMA - /* We don't stop the DMA when RX is disabled, we just stop the data transfer */ + /* Ignore redundant requests */ + + if (priv->enabled != enable) + { + /* Set a flag. If disabling, the DMA sequence will terminate at the + * completion of the next DMA. + */ + + priv->enabled = enable; - priv->enabled = enable; + /* If enabling, then we need to restart the DMA transfer */ + + sam_adc_dmastart(priv); + } #else /* Are we enabling or disabling? */ @@ -1193,7 +1281,7 @@ static int sam_adc_settimer(struct sam_adc_s *priv, uint32_t frequency, * do this without overflowing a 32-bit unsigned integer. */ - fdiv = div * frequency; + fdiv = div * frequency; DEBUGASSERT(div > 0 && div <= fdiv); /* Will check for integer overflow */ /* Set up TC_RA and TC_RC. The frequency is determined by RA and RC: TIOA is diff --git a/nuttx/configs/sama5d3x-ek/README.txt b/nuttx/configs/sama5d3x-ek/README.txt index f30f35d5b..daa430f82 100644 --- a/nuttx/configs/sama5d3x-ek/README.txt +++ b/nuttx/configs/sama5d3x-ek/README.txt @@ -746,28 +746,28 @@ SAMA5 ADC Support Basic driver configuration: System Type -> SAMA5 Peripheral Support - CONFIG_SAMA5_ADC=y : Enable ADC driver support - CONFIG_SAMA5_TC0=y : Enable the Timer/counter library need for periodic sampling + CONFIG_SAMA5_ADC=y : Enable ADC driver support + CONFIG_SAMA5_TC0=y : Enable the Timer/counter library need for periodic sampling Drivers - CONFIG_ANALOG=y : Should be automatically selected - CONFIG_ADC=y : Should be automatically selected + CONFIG_ANALOG=y : Should be automatically selected + CONFIG_ADC=y : Should be automatically selected System Type -> ADC Configuration - CONFIG_SAMA5_ADC_CHAN0=y : These settings enable the sequencer to collect - CONFIG_SAMA5_ADC_CHAN1=y : Samples from ADC channels 0-3 on each trigger + CONFIG_SAMA5_ADC_CHAN0=y : These settings enable the sequencer to collect + CONFIG_SAMA5_ADC_CHAN1=y : Samples from ADC channels 0-3 on each trigger CONFIG_SAMA5_ADC_CHAN2=y CONFIG_SAMA5_ADC_CHAN3=y CONFIG_SAMA5_ADC_SEQUENCER=y - CONFIG_SAMA5_ADC_TIOA0TRIG=y : Trigger on the TC0, channel 0 output A - CONFIG_SAMA5_ADC_TIOAFREQ=2 : At a frequency of 2Hz - CONFIG_SAMA5_ADC_TIOA_RISING=y : Trigger on the rising edge + CONFIG_SAMA5_ADC_TIOA0TRIG=y : Trigger on the TC0, channel 0 output A + CONFIG_SAMA5_ADC_TIOAFREQ=2 : At a frequency of 2Hz + CONFIG_SAMA5_ADC_TIOA_RISING=y : Trigger on the rising edge Default ADC settings (like gain and offset) may also be set if desired. System Type -> Timer/counter Configuration - CONFIG_SAMA5_TC0_TIOA0=y : Should be automatically selected + CONFIG_SAMA5_TC0_TIOA0=y : Should be automatically selected Work queue supported is also needed: @@ -779,7 +779,7 @@ SAMA5 ADC Support enabled as follows: Application Configuration -> Examples -> ADC eample - CONFIG_EXAMPLES_ADC=y : Enables the example code + CONFIG_EXAMPLES_ADC=y : Enables the example code CONFIG_EXAMPLES_ADC_DEVPATH="/dev/adc0" Other default settings for the ADC example should be okay. @@ -790,10 +790,17 @@ SAMA5 ADC Support following in the configuration. System Type -> SAMA5 Peripheral Support - CONFIG_SAMA5_DMAC1=y : Enable DMAC1 support + CONFIG_SAMA5_DMAC1=y : Enable DMAC1 support System Type -> ADC Configuration - CONFIG_SAMA5_ADC_DMA=y : Enable ADC DMA transfers + CONFIG_SAMA5_ADC_DMA=y : Enable ADC DMA transfers + CONFIG_SAMA5_ADC_DMASAMPLES=2 : Collect two sets of samples per DMA + + Drivers -> Analog device (ADC/DAC) support + CONFIG_ADC_FIFOSIZE=16 : Driver may need a large ring buffer + + Application Configuration -> Examples -> ADC eample + CONFIG_EXAMPLES_ADC_GROUPSIZE=16 : Larger buffers in the test SAMA5D3x-EK Configuration Options ================================= diff --git a/nuttx/drivers/analog/Kconfig b/nuttx/drivers/analog/Kconfig index ebed79c78..5a4019571 100644 --- a/nuttx/drivers/analog/Kconfig +++ b/nuttx/drivers/analog/Kconfig @@ -11,37 +11,50 @@ config ADC not only Analog-to-Digital Converters (ADC) but also amplifiers and analog multiplexers. +if ADC + +config ADC_FIFOSIZE + int "ADC buffer size" + default 8 + ---help--- + This variable defines the size of the ADC ring buffer that is used + to queue received ADC data until they can be retrieved by the + application by reading from the ADC character device. NOTE: Since + this is a ring buffer, the actual number of bytes that can be + retained in buffer is (ADC_FIFOSIZE - 1). + config ADC_ADS125X bool "TI ADS1255/ADS1256 support" default n - depends on ADC select SPI +if ADC_ADS125X + config ADS1255_FREQUENCY int "ADS1255/ADS1256 SPI frequency" default 1000000 - depends on ADC_ADS125X + +endif # ADC_ADS125X config ADC_PGA11X bool "TI PGA112/3/6/7 support" default n - depends on ADC select SPI ---help--- Enables support for the PGA112, PGA113, PGA116, PGA117 Zerø-Drift PROGRAMMABLE GAIN AMPLIFIER with MUX +if ADC_PGA11X + config PGA11X_SPIFREQUENCY int "TI PGA112/3/6/7 SPI frequency" default 1000000 - depends on ADC_PGA11X ---help--- PGA11x SPI frequency. config PGA11X_SPIMODE int "TI PGA112/3/6/7 SPI mode" default 0 - depends on ADC_PGA11X ---help--- PGA11x SPI mode. The specification says that the device operates in Mode 0 or Mode 3. But sometimes you need to tinker with this to get things to work @@ -50,28 +63,33 @@ config PGA11X_SPIMODE config PGA11X_DAISYCHAIN bool "TI PGA112/3/6/7 daisy chain mode" default n - depends on ADC_PGA11X ---help--- Enable support to use two PGA116/7's in Daisy Chain configuration. config PGA11X_MULTIPLE bool "Multiple TI PGA112/3/6/7 support" default n - depends on ADC_PGA11X && !PGA11X_DAISYCHAIN + depends on !PGA11X_DAISYCHAIN ---help--- Can be defined to support multiple PGA11X devices on board with separate chip selects (not daisy chained). Each device will require a customized SPI interface to distinguish them when SPI_SELECT is called with devid=SPIDEV_MUX. +endif # if ADC_PGA11X +endif # ADC + config DAC bool "Digital-to-Analog Conversion" - default n + default n ---help--- Select to enable support for Digital-to-Analog Converters (DACs). +if DAC + config DAC_AD5410 bool "AD5410 support" default n - depends on DAC select SPI + +endif # DAC diff --git a/nuttx/drivers/analog/adc.c b/nuttx/drivers/analog/adc.c index 72f19452a..5b02efa96 100644 --- a/nuttx/drivers/analog/adc.c +++ b/nuttx/drivers/analog/adc.c @@ -158,6 +158,7 @@ static int adc_open(FAR struct file *filep) sem_post(&dev->ad_closesem); } + return ret; } @@ -207,6 +208,7 @@ static int adc_close(FAR struct file *filep) sem_post(&dev->ad_closesem); } } + return ret; } diff --git a/nuttx/include/nuttx/analog/adc.h b/nuttx/include/nuttx/analog/adc.h index ac38d6820..44af05ef9 100644 --- a/nuttx/include/nuttx/analog/adc.h +++ b/nuttx/include/nuttx/analog/adc.h @@ -61,7 +61,7 @@ * Pre-processor Definitions ************************************************************************************/ -/* Default configuration settings that may be overridden in the board configuration. +/* Default configuration settings that may be overridden in the NuttX configuration * file. The configured size is limited to 255 to fit into a uint8_t. */ |