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ADC driver update

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4203 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2011-12-20 00:30:12 +00:00
parent 4034d0a5c1
commit 2ca8817c84
3 changed files with 245 additions and 46 deletions
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279
arch/arm/src/stm32/stm32_adc.c
View File

@ -50,6 +50,7 @@
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <unistd.h>
#include <arch/board/board.h>
#include <nuttx/arch.h>
@ -98,14 +99,17 @@ struct stm32_dev_s
uint8_t nchannels; /* Number of channels */
uint8_t intf; /* ADC interface number */
uint8_t current; /* Current ADC channel being converted */
#ifdef ADC_HAVE_TIMER
uint8_t trigger; /* Timer trigger channel: 0=CC1, 1=CC2, 2=CC3, 3=CC4, 4=TRGO */
#endif
xcpt_t isr; /* Interrupt handler for this ADC block */
uint32_t base; /* Base address of registers unique to this ADC block */
#ifdef ADC_HAVE_TIMER
uint32_t tbase; /* Base address of timer used by this ADC block */
uint32_t extsel; /* EXTSEL value used by this ADC block */
uint32_t presc; /* Timer prescaler value */
uint32_t pclck; /* The PCLK frequency that drives this timer */
uint32_t freq; /* The desired frequency of conversions */
#endif
uint8_t chanlist[ADC_MAX_SAMPLES];
};
@ -117,6 +121,10 @@ struct stm32_dev_s
static uint32_t adc_getreg(struct stm32_dev_s *priv, int offset);
static void adc_putreg(struct stm32_dev_s *priv, int offset, uint32_t value);
#ifdef ADC_HAVE_TIMER
static uint16_t tim_getreg(struct stm32_dev_s *priv, int offset);'
static void tim_putreg(struct stm32_dev_s *priv, int offset, uint16_t value);
#endif
static void adc_rccreset(struct stm32_dev_s *priv, bool reset);
/* ADC Interrupt Handler */
@ -142,6 +150,7 @@ static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
static void adc_enable(FAR struct stm32_dev_s *priv, bool enable);
#ifdef ADC_HAVE_TIMER
static void adc_timstart(FAR struct stm32_dev_s *priv, bool enable);
static int adc_timinit(FAR struct stm32_dev_s *priv);
#endif
static void adc_startconv(FAR struct stm32_dev_s *priv, bool enable);
@ -176,9 +185,11 @@ static struct stm32_dev_s g_adcpriv1 =
.intf = 1,
.base = STM32_ADC1_BASE,
#ifdef ADC1_HAVE_TIMER
.trigger = CONFIG_STM32_ADC1_TIMTRIG;
.tbase = ADC1_TIMER_BASE,
.extsel = ADC1_EXTSEL_VALUE,
.presc = ADC1_TIMER_PCLK_FREQUENCY / CONFIG_STM32_ADC1_SAMPLE_FREQUENCY,
.pclck = ADC1_TIMER_PCLK_FREQUENCY,
.freq = CONFIG_STM32_ADC1_SAMPLE_FREQUENCY,
#endif
};
@ -204,9 +215,11 @@ static struct stm32_dev_s g_adcpriv2 =
.intf = 2;
.base = STM32_ADC2_BASE,
#ifdef ADC2_HAVE_TIMER
.trigger = CONFIG_STM32_ADC2_TIMTRIG;
.tbase = ADC2_TIMER_BASE,
.extsel = ADC2_EXTSEL_VALUE,
.presc = ADC2_TIMER_PCLK_FREQUENCY / CONFIG_STM32_ADC2_SAMPLE_FREQUENCY,
.pclck = ADC2_TIMER_PCLK_FREQUENCY,
.freq = CONFIG_STM32_ADC2_SAMPLE_FREQUENCY,
#endif
};
@ -232,9 +245,11 @@ static struct stm32_dev_s g_adcpriv3 =
.intf = 3;
.base = STM32_ADC3_BASE,
#ifdef ADC3_HAVE_TIMER
.trigger = CONFIG_STM32_ADC3_TIMTRIG;
.tbase = ADC3_TIMER_BASE,
.extsel = ADC3_EXTSEL_VALUE,
.presc = ADC3_TIMER_PCLK_FREQUENCY / CONFIG_STM32_ADC3_SAMPLE_FREQUENCY,
.pclck = ADC3_TIMER_PCLK_FREQUENCY,
.freq = CONFIG_STM32_ADC3_SAMPLE_FREQUENCY,
#endif
};
@ -303,9 +318,9 @@ static void adc_putreg(struct stm32_dev_s *priv, int offset, uint32_t value)
****************************************************************************/
#ifdef ADC_HAVE_TIMER
static uint32_t tim_getreg(struct stm32_dev_s *priv, int offset)
static uint16_t tim_getreg(struct stm32_dev_s *priv, int offset)
{
return getreg32(priv->tbase + offset);
return getreg16(priv->tbase + offset);
}
#endif
@ -325,9 +340,48 @@ static uint32_t tim_getreg(struct stm32_dev_s *priv, int offset)
****************************************************************************/
#ifdef ADC_HAVE_TIMER
static void tim_putreg(struct stm32_dev_s *priv, int offset, uint32_t value)
static void tim_putreg(struct stm32_dev_s *priv, int offset, uint16_t value)
{
putreg32(value, priv->tbase + offset);
putreg16(value, priv->tbase + offset);
}
#endif
/****************************************************************************
* Name: adc_timstart
*
* Description:
* Start (or stop) the timer counter
*
* Input Parameters:
* priv - A reference to the ADC block status
* enable - True: Start conversion
*
* Returned Value:
*
****************************************************************************/
#ifdef ADC_HAVE_TIMER
static void adc_timstart(struct stm32_dev_s *priv, bool enable)
{
uint16_t regval;
avdbg("enable: %d\n", enable);
regval = tim_getreg(priv, STM32_BTIM_CR1_OFFSET);
if (enable)
{
/* Start the counter */
regval |= ATIM_CR1_CEN;
}
else
{
/* Disable the counter */
regval &= ~ATIM_CR1_CEN;
}
tim_putreg(priv, STM32_BTIM_CR1_OFFSET, regval);
}
#endif
@ -349,7 +403,13 @@ static void tim_putreg(struct stm32_dev_s *priv, int offset, uint32_t value)
#ifdef ADC_HAVE_TIMER
static int adc_timinit(FAR struct stm32_dev_s *priv)
{
uint32_t prescaler;
uint32_t reload;
uint32_t regval;
uint16_t cr1;
uint16_t cr2;
uint16_t ccmr1;
uint16_t ccmr2;
/* If the timer base address is zero, then this ADC was not configured to
* use a timer.
@ -357,16 +417,20 @@ static int adc_timinit(FAR struct stm32_dev_s *priv)
if (!priv->tbase)
{
#warning "Does anything need to be configured if there is no timer for this ADC?"
/* Configure the ADC to use the selected timer and timer channel as the trigger
* EXTTRIG: External Trigger Conversion mode for regular channels DISABLE
*/
regval = adc_getreg(priv, STM32_ADC_CR2_OFFSET);
regval &= ~ADC_CR2_EXTTRIG;
adc_putreg(priv, STM32_ADC_CR2_OFFSET, regval);
return OK;
}
/* Configure the ADC to use the selected timer and timer channel as the trigger */
/* EXTTRIG: External Trigger Conversion mode for regular channels */
regval = adc_getreg(priv, STM32_ADC_CR2_OFFSET)
regval |= ADC_CR2_EXTTRIG;
else
{
regval = adc_getreg(priv, STM32_ADC_CR2_OFFSET);
regval |= ADC_CR2_EXTTRIG;
}
/* EXTSEL selection: These bits select the external event used to trigger
* the start of conversion of a regular group. NOTE:
@ -382,35 +446,153 @@ static int adc_timinit(FAR struct stm32_dev_s *priv)
adc_putreg(priv, STM32_ADC_CR2_OFFSET, regval);
/* Configure the timer channel to drive the ADC */
#warning "LOTS of missing timer setup logic"
regval = priv->presc;
/* Caculate optimal values for the timer prescaler and for the timer reload
* register. If freq is the desired frequency, then
*
* reload = timclk / freq
* reload = (pclck / prescaler) / freq
*
* There are many solutions to do this, but the best solution will be the
* one that has the largest reload value and the smallest prescaler value.
* That is the solution that should give us the most accuracy in the timer
* control. Subject to:
*
* 0 <= prescaler <= 65536
* 1 <= reload <= 65535
*
* So ( prescaler = pclck / 65535 / freq ) would be optimal.
*/
prescaler = (priv->pclck / priv->freq + 65534) / 65535;
/* We need to decrement the prescaler value by one, but only, the value does
* not underflow.
*/
if (regval > 0)
if (prescaler > 0)
{
regval--;
prescaler--;
}
/* Check for overflow */
if (regval > 0xffff)
else if (prescaler > 0xffff)
{
regval = 0xffff;
adbg("WARNING: Prescaler overflowed.\n");
prescaler = 0xffff;
}
/* Save the timer prescaler value */
reload = (priv->pclck / prescaler) / priv->freq;
if (reload < 1)
{
adbg("WARNING: Reload value underflowed.\n");
reload = 1;
}
else if (reload > 65535)
{
adbg("WARNING: Reload value overflowed.\n");
reload = 65535;
}
tim_putreg(priv, STM32_BTIM_PSC_OFFSET, regval);
avdbg("TIM%d PCLCK: %d frequency: %d TIMCLK: %d prescaler: %d reload: %d\n",
priv->intf, priv->pclck, priv->freq, (priv->pclck / (prescaler+1)), prescaler, reload);
/* Set up the timer CR1 register */
cr1 = tim_getreg(priv, STM32_GTIM_CR1_OFFSET);
/* Disable the timer until we get it configured */
adc_timstart(priv, false);
/* Select the Counter Mode == count up:
*
* ATIM_CR1_EDGE: The counter counts up or down depending on the
* direction bit(DIR).
* ATIM_CR1_DIR: 0: count up, 1: count down
*/
cr1 &= ~(ATIM_CR1_DIR | ATIM_CR1_CMS_MASK);
cr1 |= ATIM_CR1_EDGE;
/* Set the clock division to zero for all */
cr1 &= ~GTIM_CR1_CKD_MASK;
tim_putreg(priv, STM32_GTIM_CR1_OFFSET, cr1);
/* Save the timer prescaler value and autoreload value*/
tim_putreg(priv, STM32_BTIM_PSC_OFFSET, prescaler);
tim_putreg(priv, STM32_BTIM_ARR_OFFSET, reload);
/* Clear the advanced timers repitition counter in TIM1 */
#if defined(CONFIG_STM32_TIM1_ADC3) || defined(CONFIG_STM32_TIM8_ADC3)
if (priv->tbase == STM32_TIM1_BASE || priv->tbase == STM32_TIM8_BASE)
{
tim_putreg(priv, STM32_ATIM_RCR_OFFSET, 0);
}
#endif
/* TIMx event generation: Bit 0 UG: Update generation */
tim_putreg(priv, STM32_GTIM_EGR_OFFSET, ATIM_EGR_UG);
/* CCMR Configurations */
ccmr1 = 0;
ccmr2 = 0;
switch (priv->trigger)
{
case 0: /* Timer x CC1 event */
{
ccmr1 = (ATIM_CCMR_CCS_CCIN1 << ATIM_CCMR1_CC1S_SHIFT) |
(ATIM_CCMR_MODE_PWM1 << ATIM_CCMR1_OC1M_SHIFT) |
0x01; /* CC1 channel is configured as input, IC1 is mapped on TI1 */
#warning "* I will fix this numeric values with the definitions *"
ccmr2 = 0x68;
}
break;
case 1: /* Timer x CC2 event */
{
#warning "missing logic, I want the Timer-x-CC1-event working first"
}
break;
case 2: /* Timer x CC3 event */
{
#warning "missing logic, I want the Timer-x-CC1-event working first"
}
break;
case 3: /* Timer x CC4 event */
{
#warning "missing logic, I want the Timer-x-CC1-event working first"
}
break;
case 4: /* Timer x TRGO event */
{
#warning "missing logic, I want the Timer-x-CC1-event working first"
}
break;
default:
return -EINVAL;
}
/* Enable the timer counter */
/* All but the CEN bit with the default config in CR1 */
regval = stm32_tim_getreg(priv, STM32_BTIM_CR1_OFFSET);
regval |= ATIM_CR1_CEN;
tim_putreg(priv, STM32_BTIM_CR1_OFFSET, val);
adc_timstart(priv, true);
return OK;
}
#endif
@ -447,7 +629,7 @@ static void adc_startconv(struct stm32_dev_s *priv, bool enable)
regval &= ~ADC_CR2_SWSTART;
}
regval = adc_getreg(priv, STM32_ADC_CR2_OFFSET);
adc_putreg(priv, STM32_ADC_CR2_OFFSET,regval);
}
/****************************************************************************
@ -573,6 +755,7 @@ static void adc_reset(FAR struct adc_dev_s *dev)
irqstate_t flags;
uint32_t regval;
int offset;
int ret;
int i;
avdbg("intf: %d\n", priv->intf);
@ -625,14 +808,21 @@ static void adc_reset(FAR struct adc_dev_s *dev)
adc_putreg(priv, STM32_ADC_SMPR2_OFFSET, 0x00b6db6d);
#ifdef ADC_HAVE_TIMER
adc_timinit(priv);
ret = adc_timinit(priv);
if (ret!=OK)
{
adbg("Error initializing the timers\n");
}
#endif
/* ADC CR1 Configuration */
regval = adc_getreg(priv, STM32_ADC_CR1_OFFSET);
regval &= ~ADC_CR1_DUALMOD_MASK;
regval &= ~ADC_CR1_SCAN; /* Clear DUALMODE and SCAN bits */
/* Clear DUALMODE and SCAN bits */
regval &= ~ADC_CR1_DUALMOD_MASK;
regval &= ~ADC_CR1_SCAN;
adc_putreg(priv, STM32_ADC_CR1_OFFSET, regval);
/* Initialize the ADC_Mode (ADC_Mode_Independent) */
@ -703,16 +893,18 @@ static void adc_reset(FAR struct adc_dev_s *dev)
priv->current = 0;
usleep(10);
/* Set ADON to wake up the ADC from Power Down state. */
usleep(10);
adc_enable(priv, true);
/* Set ADON (Again) to start the conversion. */
adc_enable(priv, true);
irqrestore(flags);
irqrestore(flags);
avdbg("SR: %08x CR1: 0x%08x CR2: 0x%08x\n",
adc_getreg(priv, STM32_ADC_SR_OFFSET),
adc_getreg(priv, STM32_ADC_CR1_OFFSET),
@ -752,9 +944,11 @@ static int adc_setup(FAR struct adc_dev_s *dev)
{
/* Enable the ADC interrupt */
avdbg("Enable the ADC interrupt: irq=%d\n", priv->irq);
up_enable_irq(priv->irq);
}
avdbg("Returning %d\n",ret);
return ret;
}
@ -863,9 +1057,9 @@ static int adc_interrupt(FAR struct adc_dev_s *dev)
adcsr = adc_getreg(priv, STM32_ADC_SR_OFFSET);
if ((adcsr & ADC_SR_AWD) != 0)
{
adbg(" Analog Watchdog, Value converted out of range!\n");
adbg("WARNING: Analog Watchdog, Value converted out of range!\n");
}
/* EOC: End of conversion */
if ((adcsr & ADC_SR_EOC) != 0)
@ -878,7 +1072,7 @@ static int adc_interrupt(FAR struct adc_dev_s *dev)
#error "not yet implemented"
value &= ADC_DR_ADC2DATA_MASK;
#endif
/* Give the ADC data to the ADC dirver. adc_receive accepts 3 parameters:
*
* 1) The first is the ADC device instance for this ADC block.
@ -886,8 +1080,9 @@ static int adc_interrupt(FAR struct adc_dev_s *dev)
* 3) The third is the converted data for the channel.
*/
avdbg("Calling adc_receive(dev, priv->chanlist[%d], value=%d)", priv->current, value);
adc_receive(dev, priv->chanlist[priv->current], value);
/* Set the channel number of the next channel that will complete conversion */
#if 0
#error "This logic force to read the following channels but never reads the real converted value"
@ -1106,7 +1301,7 @@ struct adc_dev_s *stm32_adcinitialize(int intf, const uint8_t *chanlist, int nch
#ifdef CONFIG_STM32_ADC1
if (intf == 1)
{
adbg("ADC1 Selected\n");
avdbg("ADC1 Selected\n");
dev = &g_adcdev1;
}
else
@ -1114,7 +1309,7 @@ struct adc_dev_s *stm32_adcinitialize(int intf, const uint8_t *chanlist, int nch
#ifdef CONFIG_STM32_ADC2
if (intf == 2)
{
adbg("ADC2 Selected\n");
avdbg("ADC2 Selected\n");
dev = &g_adcdev2;
}
else
@ -1122,7 +1317,7 @@ struct adc_dev_s *stm32_adcinitialize(int intf, const uint8_t *chanlist, int nch
#ifdef CONFIG_STM32_ADC3
if (intf == 3)
{
adbg("ADC3 Selected\n");
avdbg("ADC3 Selected\n");
dev = &g_adcdev3;
}
else

10
configs/stm3210e-eval/src/up_adc.c
View File

@ -47,6 +47,8 @@
#include "chip.h"
#include "up_arch.h"
#include "stm32_pwm.h"
#include "stm3210e-internal.h"
#ifdef CONFIG_ADC
@ -74,7 +76,7 @@
/* The number of ADC channels in the conversion list */
#define ADC_NCHANNELS 3
#define ADC_NCHANNELS 2
/************************************************************************************
* Private Data
@ -82,11 +84,11 @@
/* Identifying number of each ADC channel: Variable Resistor , BNC_CN5 and BNC_CN3 */
static const uint8_t g_chanlist[ADC_NCHANNELS] = {14, 10, 12};
static const uint8_t g_chanlist[ADC_NCHANNELS] = {14, 10};
/* Configurations of pins used byte each ADC channels */
static const uint32_t g_pinlist[ADC_NCHANNELS] = {GPIO_ADC1_IN14 , GPIO_ADC1_IN10, GPIO_ADC1_IN13};
static const uint32_t g_pinlist[ADC_NCHANNELS] = {GPIO_ADC1_IN14 , GPIO_ADC1_IN10};
/************************************************************************************
* Private Functions
@ -118,7 +120,7 @@ int adc_devinit(void)
for(i = 0; i < ADC_NCHANNELS; i++)
{
stm32_configgpio(chanlist[i]);
stm32_configgpio(g_chanlist[i]);
}
/* Call stm32_adcinitialize() to get an instance of the ADC interface */

2
configs/stm3240g-eval/src/up_adc.c
View File

@ -47,6 +47,8 @@
#include "chip.h"
#include "up_arch.h"
#include "stm32_pwm.h"
#include "stm3240g-internal.h"
#ifdef CONFIG_ADC