diff options
author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-10-04 17:08:59 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-10-04 17:08:59 +0000 |
commit | 68c47baf9fce581d0078384ef0fcdb6436292fcb (patch) | |
tree | 2acea35bd828c7017ca8e48dd2bafc4fe2610c15 /nuttx/drivers/input | |
parent | 0eda7244af71108683fb409517ccb18dd78dd65c (diff) | |
download | px4-nuttx-68c47baf9fce581d0078384ef0fcdb6436292fcb.tar.gz px4-nuttx-68c47baf9fce581d0078384ef0fcdb6436292fcb.tar.bz2 px4-nuttx-68c47baf9fce581d0078384ef0fcdb6436292fcb.zip |
ADS7843E driver is code complete
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4018 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/drivers/input')
-rw-r--r--[-rwxr-xr-x] | nuttx/drivers/input/Make.defs | 0 | ||||
-rw-r--r-- | nuttx/drivers/input/ads7843e.c | 377 | ||||
-rw-r--r-- | nuttx/drivers/input/ads7843e.h | 101 |
3 files changed, 292 insertions, 186 deletions
diff --git a/nuttx/drivers/input/Make.defs b/nuttx/drivers/input/Make.defs index e32dc4549..e32dc4549 100755..100644 --- a/nuttx/drivers/input/Make.defs +++ b/nuttx/drivers/input/Make.defs diff --git a/nuttx/drivers/input/ads7843e.c b/nuttx/drivers/input/ads7843e.c index d92073b72..16842f4cf 100644 --- a/nuttx/drivers/input/ads7843e.c +++ b/nuttx/drivers/input/ads7843e.c @@ -53,6 +53,7 @@ #include <fcntl.h> #include <semaphore.h> #include <poll.h> +#include <wdog.h> #include <errno.h> #include <assert.h> #include <debug.h> @@ -71,77 +72,11 @@ /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ -/* Configuration ************************************************************/ -/* Reference counting is partially implemented, but not needed in the - * current design. - */ - -#undef CONFIG_ADS7843E_REFCNT - -/* Driver support ***********************************************************/ -/* This format is used to construct the /dev/input[n] device driver path. It - * defined here so that it will be used consistently in all places. - */ - -#define DEV_FORMAT "/dev/input%d" -#define DEV_NAMELEN 16 /**************************************************************************** * Private Types ****************************************************************************/ -/* This describes the state of one contact */ - -enum ads7843e_contact_3 -{ - CONTACT_NONE = 0, /* No contact */ - CONTACT_DOWN, /* First contact */ - CONTACT_MOVE, /* Same contact, possibly different position */ - CONTACT_UP, /* Contact lost */ -}; - -/* This structure describes the results of one ADS7843E sample */ - -struct ads7843e_sample_s -{ - uint8_t id; /* Sampled touch point ID */ - uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */ - uint16_t x; /* Measured X position */ - uint16_t y; /* Measured Y position */ -#warning "Missing other measurement data" /* Like size and pressure */ -}; - -/* This structure describes the state of one ADS7843E driver instance */ - -struct ads7843e_dev_s -{ -#ifdef CONFIG_ADS7843E_MULTIPLE - FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */ -#endif -#ifdef CONFIG_ADS7843E_REFCNT - uint8_t crefs; /* Number of times the device has been opened */ -#endif - uint8_t nwaiters; /* Number of threads waiting for ADS7843E data */ - uint8_t id; /* Current touch point ID */ - volatile bool penchange; /* An unreported event is buffered */ - sem_t devsem; /* Manages exclusive access to this structure */ - sem_t waitsem; /* Used to wait for the availability of data */ - - FAR struct ads7843e_config_s *config; /* Board configuration data */ - FAR struct spi_dev_s *spi; /* Saved SPI driver instance */ - struct work_s work; /* Supports the interrupt handling "bottom half" */ - struct ads7843e_sample_s sample; /* Last sampled touch point data */ - - /* The following is a list if poll structures of threads waiting for - * driver events. The 'struct pollfd' reference for each open is also - * retained in the f_priv field of the 'struct file'. - */ - -#ifndef CONFIG_DISABLE_POLL - struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS]; -#endif -}; - /**************************************************************************** * Private Function Prototypes ****************************************************************************/ @@ -156,6 +91,9 @@ static void ads7843e_select(FAR struct spi_dev_s *spi); static void ads7843e_deselect(FAR struct spi_dev_s *spi); #endif +static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv); +static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd); + /* Interrupts and data sampling */ static void ads7843e_notify(FAR struct ads7843e_dev_s *priv); @@ -163,7 +101,6 @@ static int ads7843e_sample(FAR struct ads7843e_dev_s *priv, FAR struct ads7843e_sample_s *sample); static int ads7843e_waitsample(FAR struct ads7843e_dev_s *priv, FAR struct ads7843e_sample_s *sample); -static int ads7843e_transfer(FAR struct ads7843e_dev_s *priv, uint8_t cmd); static void ads7843e_worker(FAR void *arg); static int ads7843e_interrupt(int irq, FAR void *context); @@ -214,47 +151,6 @@ static struct ads7843e_dev_s *g_ads7843elist; ****************************************************************************/ /**************************************************************************** - * Function: ads7843e_configspi - * - * Description: - * Configure the SPI for use with the ADS7843E. This funcution should be - * called once during touchscreen initialization to configure the SPI - * bus. Note that if CONFIG_SPI_OWNBUS is not defined, then this function - * does nothing. - * - * Parameters: - * spi - Reference to the SPI driver structure - * - * Returned Value: - * None - * - * Assumptions: - * - ****************************************************************************/ - -static inline void ads7843e_configspi(FAR struct spi_dev_s *spi) -{ -#ifdef CONFIG_ADS7843E_FREQUENCY - idbg("Mode: %d Bits: 8 Frequency: %d\n", - CONFIG_ADS7843E_SPIMODE, CONFIG_ADS7843E_FREQUENCY); -#else - idbg("Mode: %d Bits: 8\n", CONFIG_ADS7843E_SPIMODE); -#endif - - /* Configure SPI for the P14201. But only if we own the SPI bus. Otherwise, don't - * bother because it might change. - */ - -#ifdef CONFIG_SPI_OWNBUS - SPI_SETMODE(spi, CONFIG_ADS7843E_SPIMODE); - SPI_SETBITS(spi, 8); -#ifdef CONFIG_ADS7843E_FREQUENCY - SPI_SETFREQUENCY(spi, CONFIG_ADS7843E_FREQUENCY) -#endif -#endif -} - -/**************************************************************************** * Function: ads7843e_select * * Description: @@ -278,7 +174,7 @@ static inline void ads7843e_select(FAR struct spi_dev_s *spi) { /* We own the SPI bus, so just select the chip */ - SPI_SELECT(spi, SPIDEV_DISPLAY, true); + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); } #else static void ads7843e_select(FAR struct spi_dev_s *spi) @@ -288,7 +184,7 @@ static void ads7843e_select(FAR struct spi_dev_s *spi) */ SPI_LOCK(spi, true); - SPI_SELECT(spi, SPIDEV_DISPLAY, true); + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); /* Now make sure that the SPI bus is configured for the P14201 (it * might have gotten configured for a different device while unlocked) @@ -302,7 +198,6 @@ static void ads7843e_select(FAR struct spi_dev_s *spi) } #endif - /**************************************************************************** * Function: ads7843e_deselect * @@ -328,19 +223,101 @@ static inline void ads7843e_deselect(FAR struct spi_dev_s *spi) { /* We own the SPI bus, so just de-select the chip */ - SPI_SELECT(spi, SPIDEV_DISPLAY, false); + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); } #else static void ads7843e_deselect(FAR struct spi_dev_s *spi) { /* De-select P14201 chip and relinquish the SPI bus. */ - SPI_SELECT(spi, SPIDEV_DISPLAY, false); + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); SPI_LOCK(spi, false); } #endif /**************************************************************************** + * Function: ads7843e_configspi + * + * Description: + * Configure the SPI for use with the ADS7843E. This funcution should be + * called once during touchscreen initialization to configure the SPI + * bus. Note that if CONFIG_SPI_OWNBUS is not defined, then this function + * does nothing. + * + * Parameters: + * spi - Reference to the SPI driver structure + * + * Returned Value: + * None + * + * Assumptions: + * + ****************************************************************************/ + +static inline void ads7843e_configspi(FAR struct spi_dev_s *spi) +{ +#ifdef CONFIG_ADS7843E_FREQUENCY + idbg("Mode: %d Bits: 8 Frequency: %d\n", + CONFIG_ADS7843E_SPIMODE, CONFIG_ADS7843E_FREQUENCY); +#else + idbg("Mode: %d Bits: 8\n", CONFIG_ADS7843E_SPIMODE); +#endif + + /* Configure SPI for the P14201. But only if we own the SPI bus. Otherwise, don't + * bother because it might change. + */ + +#ifdef CONFIG_SPI_OWNBUS + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, true); + SPI_SETMODE(spi, CONFIG_ADS7843E_SPIMODE); + SPI_SETBITS(spi, 8); +#ifdef CONFIG_ADS7843E_FREQUENCY + SPI_SETFREQUENCY(spi, CONFIG_ADS7843E_FREQUENCY) +#endif + SPI_SELECT(spi, SPIDEV_TOUCHSCREEN, false); +#endif +} + +/**************************************************************************** + * Name: ads7843e_waitbusy + ****************************************************************************/ + +static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv) +{ + while (priv->config->busy(priv->config)); +} + +/**************************************************************************** + * Name: ads7843e_sendcmd + ****************************************************************************/ + +static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd) +{ + uint8_t buffer[2]; + uint16_t result; + + /* Select the ADS7843E */ + + ads7843e_select(priv->spi); + + /* Send the command */ + + (void)SPI_SEND(priv->spi, cmd); + ads7843e_waitbusy(priv); + + /* Read the data */ + + SPI_RECVBLOCK(priv->spi, buffer, 2); + ads7843e_deselect(priv->spi); + + result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1]; + result = result >> 4; + + ivdbg("cmd:%02x response:%04x\n", cmd, result); + return result; +} + +/**************************************************************************** * Name: ads7843e_notify ****************************************************************************/ @@ -470,6 +447,7 @@ static int ads7843e_waitsample(FAR struct ads7843e_dev_s *priv, { /* Wait for a change in the ADS7843E state */ + ivdbg("Waiting..\n"); priv->nwaiters++; ret = sem_wait(&priv->waitsem); priv->nwaiters--; @@ -480,13 +458,16 @@ static int ads7843e_waitsample(FAR struct ads7843e_dev_s *priv, * the failure now. */ + idbg("sem_wait: %d\n", errno); DEBUGASSERT(errno == EINTR); ret = -EINTR; goto errout; } } - /* Re-acquire the the semaphore that manages mutually exclusive access to + ivdbg("Sampled\n"); + + /* Re-acquire the the semaphore that manages mutually exclusive access to * the device structure. We may have to wait here. But we have our sample. * Interrupts and pre-emption will be re-enabled while we wait. */ @@ -512,15 +493,56 @@ errout: } /**************************************************************************** - * Name: ads7843e_transfer + * Name: ads7843e_schedule ****************************************************************************/ -static int ads7843e_transfer(FAR struct ads7843e_dev_s *priv, uint8_t cmd) +static int ads7843e_schedule(FAR struct ads7843e_dev_s *priv) { - int ret = 0; -#warning "Missing logic" - ivdbg("data: 0x%04x\n", ret); - return ret; + FAR struct ads7843e_config_s *config; + int ret; + + /* Get a pointer the callbacks for convenience (and so the code is not so + * ugly). + */ + + config = priv->config; + DEBUGASSERT(config != NULL); + + /* Disable further interrupts. ADS7843E interrupts will be re-enabled + * after the worker thread exectues. + */ + + config->enable(config, false); + + /* Disable the watchdog timer. It will be re-enabled in the worker thread + * while the pen remains down. + */ + + wd_cancel(priv->wdog); + + /* Transfer processing to the worker thread. Since ADS7843E interrupts are + * disabled while the work is pending, no special action should be required + * to protected the work queue. + */ + + DEBUGASSERT(priv->work.worker == NULL); + ret = work_queue(&priv->work, ads7843e_worker, priv, 0); + if (ret != 0) + { + illdbg("Failed to queue work: %d\n", ret); + } + + return OK; +} + +/**************************************************************************** + * Name: ads7843e_wdog + ****************************************************************************/ + +static void ads7843e_wdog(int argc, uint32_t arg1, ...) +{ + FAR struct ads7843e_dev_s *priv = (FAR struct ads7843e_dev_s *)((uintptr_t)arg1); + (void)ads7843e_schedule(priv); } /**************************************************************************** @@ -530,11 +552,8 @@ static int ads7843e_transfer(FAR struct ads7843e_dev_s *priv, uint8_t cmd) static void ads7843e_worker(FAR void *arg) { FAR struct ads7843e_dev_s *priv = (FAR struct ads7843e_dev_s *)arg; - FAR struct ads7843e_config_s *config; /* Convenience pointer */ - bool pendown; /* true: pend is down */ - uint16_t x; /* X position */ - uint16_t y; /* Y position */ -#warning "Missing other measurement data" /* Like size and pressure */ + FAR struct ads7843e_config_s *config; + bool pendown; ASSERT(priv != NULL); @@ -545,6 +564,10 @@ static void ads7843e_worker(FAR void *arg) config = priv->config; DEBUGASSERT(config != NULL); + /* Disable the watchdog timer */ + + wd_cancel(priv->wdog); + /* Check for pen up or down by reading the PENIRQ GPIO. */ pendown = config->pendown(config); @@ -561,24 +584,22 @@ static void ads7843e_worker(FAR void *arg) { goto errout; } + + /* The pen is up. NOTE: We know from a previous test, that this is a + * loss of contact condition. This will be changed to CONTACT_NONE + * after the loss of contact is sampled. + */ + + priv->sample.contact = CONTACT_UP; } else { /* Handle all pen down events. First, sample positional values. */ -#warning "Missing logic" - - /* Save the measurements */ + priv->sample.x = ads7843e_sendcmd(priv, ADS7843_CMD_XPOSITION); + priv->sample.y = ads7843e_sendcmd(priv, ADS7843_CMD_YPOSITION); + (void)ads7843e_sendcmd(priv, ADS7843_CMD_ENABPINIRQ); - priv->sample.x = x; - priv->sample.y = y; -#warning "Missing other measurement data" /* Like size and pressure */ - } - - /* Note the availability of new measurements */ - - if (pendown) - { /* If this is the first (acknowledged) pend down report, then report * this as the first contact. If contact == CONTACT_DOWN, it will be * set to set to CONTACT_MOVE after the contact is first sampled. @@ -590,15 +611,10 @@ static void ads7843e_worker(FAR void *arg) priv->sample.contact = CONTACT_DOWN; } - } - else /* if (priv->sample.contact != CONTACT_NONE) */ - { - /* The pen is up. NOTE: We know from a previous test, that this is a - * loss of contact condition. This will be changed to CONTACT_NONE - * after the loss of contact is sampled. - */ - priv->sample.contact = CONTACT_UP; + /* Continue to sample the position while the pen is down */ + + wd_start(priv->wdog, ADS7843E_WDOG_DELAY, ads7843e_wdog, 1, (uint32_t)priv); } /* Indicate the availability of new sample data for this ID */ @@ -624,7 +640,7 @@ static int ads7843e_interrupt(int irq, FAR void *context) { FAR struct ads7843e_dev_s *priv; FAR struct ads7843e_config_s *config; - int ret; + int ret; /* Which ADS7843E device caused the interrupt? */ @@ -645,26 +661,14 @@ static int ads7843e_interrupt(int irq, FAR void *context) config = priv->config; DEBUGASSERT(config != NULL); - /* Disable further interrupts */ - - config->enable(config, false); - - /* Transfer processing to the worker thread. Since ADS7843E interrupts are - * disabled while the work is pending, no special action should be required - * to protected the work queue. - */ + /* Schedule sampling to occur on the worker thread */ - DEBUGASSERT(priv->work.worker == NULL); - ret = work_queue(&priv->work, ads7843e_worker, priv, 0); - if (ret != 0) - { - illdbg("Failed to queue work: %d\n", ret); - } + ret = ads7843e_schedule(priv); /* Clear any pending interrupts and return success */ config->clear(config); - return OK; + return ret; } /**************************************************************************** @@ -679,6 +683,8 @@ static int ads7843e_open(FAR struct file *filep) uint8_t tmp; int ret; + ivdbg("Opening\n"); + DEBUGASSERT(filep); inode = filep->f_inode; @@ -719,6 +725,7 @@ errout_with_sem: sem_post(&priv->devsem); return ret; #else + ivdbg("Opening\n"); return OK; #endif } @@ -734,6 +741,7 @@ static int ads7843e_close(FAR struct file *filep) FAR struct ads7843e_dev_s *priv; int ret; + ivdbg("Closing\n"); DEBUGASSERT(filep); inode = filep->f_inode; @@ -763,6 +771,7 @@ static int ads7843e_close(FAR struct file *filep) sem_post(&priv->devsem); #endif + ivdbg("Closing\n"); return OK; } @@ -773,11 +782,12 @@ static int ads7843e_close(FAR struct file *filep) static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t len) { FAR struct inode *inode; - FAR struct ads7843e_dev_s *priv; + FAR struct ads7843e_dev_s *priv; FAR struct touch_sample_s *report; - struct ads7843e_sample_s sample; + struct ads7843e_sample_s sample; int ret; + ivdbg("buffer:%p len:%d\n", buffer, len); DEBUGASSERT(filep); inode = filep->f_inode; @@ -794,6 +804,7 @@ static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t le * handle smaller reads... but why? */ + idbg("Unsupported read size: %d\n", len); return -ENOSYS; } @@ -804,6 +815,7 @@ static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t le { /* This should only happen if the wait was canceled by an signal */ + idbg("sem_wait: %d\n", errno); DEBUGASSERT(errno == EINTR); return -EINTR; } @@ -818,6 +830,7 @@ static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t le * option, then just return an error. */ + ivdbg("Sample data is not available\n"); if (filep->f_oflags & O_NONBLOCK) { ret = -EAGAIN; @@ -831,6 +844,7 @@ static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t le { /* We might have been awakened by a signal */ + idbg("ads7843e_waitsample: %d\n", ret); goto errout; } } @@ -845,7 +859,6 @@ static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t le report->point[0].id = priv->id; report->point[0].x = sample.x; report->point[0].y = sample.y; - report->point[0].pressure = 42; /* ???????????????????? */ /* Report the appropriate flags */ @@ -859,19 +872,25 @@ static ssize_t ads7843e_read(FAR struct file *filep, FAR char *buffer, size_t le { /* First contact */ - report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | TOUCH_POS_VALID | TOUCH_PRESSURE_VALID; + report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | TOUCH_POS_VALID; } else /* if (sample->contact == CONTACT_MOVE) */ { /* Movement of the same contact */ - report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID | TOUCH_PRESSURE_VALID; + report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID; } + ivdbg(" id: %d\n", report->point[0].id); + ivdbg(" flags: %02x\n", report->point[0].flags); + ivdbg(" x: %d\n", report->point[0].x); + ivdbg(" y: %d\n", report->point[0].y); + ret = SIZEOF_TOUCH_SAMPLE_S(1); errout: sem_post(&priv->devsem); + ivdbg("Returning: %d\n", ret); return ret; } @@ -907,22 +926,6 @@ static int ads7843e_ioctl(FAR struct file *filep, int cmd, unsigned long arg) switch (cmd) { - case TSIOC_SETCALIB: /* arg: Pointer to int calibration value */ - { - FAR int *ptr = (FAR int *)((uintptr_t)arg); - DEBUGASSERT(priv->config != NULL && ptr != NULL); - priv->config->calib = *ptr; - } - break; - - case TSIOC_GETCALIB: /* arg: Pointer to int calibration value */ - { - FAR int *ptr = (FAR int *)((uintptr_t)arg); - DEBUGASSERT(priv->config != NULL && ptr != NULL); - *ptr = priv->config->calib; - } - break; - case TSIOC_SETFREQUENCY: /* arg: Pointer to uint32_t frequency value */ { FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg); @@ -1084,8 +1087,6 @@ int ads7843e_register(FAR struct spi_dev_s *dev, /* Debug-only sanity checks */ DEBUGASSERT(dev != NULL && config != NULL && minor >= 0 && minor < 100); - DEBUGASSERT(config->attach != NULL && config->enable != NULL && - config->clear != NULL && config->pendown != NULL); /* Create and initialize a ADS7843E device driver instance */ @@ -1105,6 +1106,7 @@ int ads7843e_register(FAR struct spi_dev_s *dev, memset(priv, 0, sizeof(struct ads7843e_dev_s)); priv->spi = dev; /* Save the SPI device handle */ priv->config = config; /* Save the board configuration */ + priv->wdog = wd_create(); /* Create a watchdog timer */ sem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */ sem_init(&priv->waitsem, 0, 0); /* Initialize pen event wait semaphore */ @@ -1126,10 +1128,13 @@ int ads7843e_register(FAR struct spi_dev_s *dev, goto errout_with_priv; } - /* Initialize the touchscreen device */ + /* Configure the SPI interface */ ads7843e_configspi(dev); -#warning "Missing logic" + + /* Enable the PEN IRQ */ + + ads7843e_sendcmd(priv, ADS7843_CMD_ENABPINIRQ); /* Register the device as an input device */ diff --git a/nuttx/drivers/input/ads7843e.h b/nuttx/drivers/input/ads7843e.h index 80106c3b8..17671aefd 100644 --- a/nuttx/drivers/input/ads7843e.h +++ b/nuttx/drivers/input/ads7843e.h @@ -44,14 +44,115 @@ * Included Files ********************************************************************************************/ +#include <nuttx/config.h> + +#include <stdint.h> +#include <semaphore.h> +#include <poll.h> +#include <wdog.h> +#include <nuttx/wqueue.h> + +#include <nuttx/spi.h> +#include <nuttx/clock.h> +#include <nuttx/input/ads7843e.h> + /******************************************************************************************** * Pre-Processor Definitions ********************************************************************************************/ +/* Configuration ****************************************************************************/ +/* Reference counting is partially implemented, but not needed in the + * current design. + */ + +#undef CONFIG_ADS7843E_REFCNT + +/* ADS7843E Interfaces *********************************************************************/ +/* ADS7843E command bit settings */ + +#define ADS7843E_CMD_PD0 (1 << 0) /* PD0 */ +#define ADS7843E_CMD_PD1 (1 << 1) /* PD1 */ +#define ADS7843E_CMD_DFR (1 << 2) /* SER/DFR */ +#define ADS7843E_CMD_EIGHT_BITS_MOD (1 << 3) /* Mode */ +#define ADS7843E_CMD_START (1 << 7) /* Start Bit */ +#define ADS7843E_CMD_SWITCH_SHIFT 4 /* Address setting */ + +/* ADS7843E Commands */ + +#define ADS7843_CMD_YPOSITION \ + ((1 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START|ADS7843E_CMD_PD0|ADS7843E_CMD_PD1) +#define ADS7843_CMD_XPOSITION \ + ((5 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START|ADS7843E_CMD_PD0|ADS7843E_CMD_PD1) +#define ADS7843_CMD_ENABPINIRQ \ + ((1 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START) + +/* Driver support **************************************************************************/ +/* This format is used to construct the /dev/input[n] device driver path. It + * defined here so that it will be used consistently in all places. + */ + +#define DEV_FORMAT "/dev/input%d" +#define DEV_NAMELEN 16 + +/* Poll the pen position while the pen is down at this rate (50MS): */ + +#define ADS7843E_WDOG_DELAY ((50 + (MSEC_PER_TICK-1))/ MSEC_PER_TICK) /******************************************************************************************** * Public Types ********************************************************************************************/ +/* This describes the state of one contact */ + +enum ads7843e_contact_3 +{ + CONTACT_NONE = 0, /* No contact */ + CONTACT_DOWN, /* First contact */ + CONTACT_MOVE, /* Same contact, possibly different position */ + CONTACT_UP, /* Contact lost */ +}; + +/* This structure describes the results of one ADS7843E sample */ + +struct ads7843e_sample_s +{ + uint8_t id; /* Sampled touch point ID */ + uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */ + uint16_t x; /* Measured X position */ + uint16_t y; /* Measured Y position */ +}; + +/* This structure describes the state of one ADS7843E driver instance */ + +struct ads7843e_dev_s +{ +#ifdef CONFIG_ADS7843E_MULTIPLE + FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */ +#endif +#ifdef CONFIG_ADS7843E_REFCNT + uint8_t crefs; /* Number of times the device has been opened */ +#endif + uint8_t nwaiters; /* Number of threads waiting for ADS7843E data */ + uint8_t id; /* Current touch point ID */ + volatile bool penchange; /* An unreported event is buffered */ + sem_t devsem; /* Manages exclusive access to this structure */ + sem_t waitsem; /* Used to wait for the availability of data */ + + FAR struct ads7843e_config_s *config; /* Board configuration data */ + FAR struct spi_dev_s *spi; /* Saved SPI driver instance */ + struct work_s work; /* Supports the interrupt handling "bottom half" */ + struct ads7843e_sample_s sample; /* Last sampled touch point data */ + WDOG_ID wdog; /* Poll the position while the pen is down */ + + /* The following is a list if poll structures of threads waiting for + * driver events. The 'struct pollfd' reference for each open is also + * retained in the f_priv field of the 'struct file'. + */ + +#ifndef CONFIG_DISABLE_POLL + struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS]; +#endif +}; + /******************************************************************************************** * Public Function Prototypes ********************************************************************************************/ |