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Add SLCD ioctl commands

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This commit is contained in:
Gregory Nutt 2013-05-23 18:25:02 -06:00
parent 449c597e2c
commit 4b554ae675
2 changed files with 149 additions and 17 deletions
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13
configs/stm32ldiscovery/include/board.h
View File

@ -351,6 +351,19 @@ xcpt_t up_irqbutton(int id, xcpt_t irqhandler);
#endif
#endif
/****************************************************************************
* Name: stm32_slcd_initialize
*
* Description:
* Initialize the STM32L-Discovery LCD hardware and register the character
* driver as /dev/slcd.
*
****************************************************************************/
#ifdef CONFIG_STM32_LCD
int stm32_slcd_initialize(void);
#endif
#undef EXTERN
#if defined(__cplusplus)
}

153
configs/stm32ldiscovery/src/stm32_lcd.c
View File

@ -120,7 +120,9 @@
/* LCD characteristics */
#define SLCD_NROWS 1
#define SLCD_NCHARS 6
#define SLCD_MAXCONTRAST 7
/* An ASCII character may need to be decorated with a colon or decimal point */
@ -283,9 +285,7 @@ struct stm32_slcdstate_s
uint8_t curpos; /* The current cursor position */
uint8_t buffer[SLCD_NCHARS]; /* SLCD ASCII content */
uint8_t options[SLCD_NCHARS]; /* With colon or decimal point decoration */
#if 0 /* Not used */
uint8_t bar[2]; /* Controls the bars on the far right of the SLCD */
#endif
};
/****************************************************************************
@ -295,11 +295,9 @@ struct stm32_slcdstate_s
static void slcd_clear(void);
static int slcd_getstream(FAR struct lib_instream_s *instream);
#if 0 /* Not used */
static uint8_t slcd_getcontrast(void);
static int slcd_setcontrast(uint8_t contrast);
static void slcd_writebar(void);
#endif
static inline uint16_t slcd_mapch(uint8_t ch);
static inline void slcd_writemem(uint16_t bitset, int curpos);
static void slcd_writech(uint8_t ch, uint8_t curpos, uint8_t options);
@ -310,6 +308,7 @@ static inline void slcd_action(enum slcdcode_e code, uint8_t count);
static ssize_t slcd_read(FAR struct file *, FAR char *, size_t);
static ssize_t slcd_write(FAR struct file *, FAR const char *, size_t);
static int slcd_ioctl(FAR struct file *filp, int cmd, unsigned long arg);
#ifndef CONFIG_DISABLE_POLL
static int slcd_poll(FAR struct file *filp, FAR struct pollfd *fds, bool setup);
#endif
@ -327,7 +326,7 @@ static const struct file_operations g_slcdops =
slcd_read, /* read */
slcd_write, /* write */
0, /* seek */
0 /* ioctl */
slcd_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, slcd_poll /* poll */
#endif
@ -484,21 +483,18 @@ static int slcd_getstream(FAR struct lib_instream_s *instream)
* Name: slcd_getcontrast
****************************************************************************/
#if 0 /* Not used */
static uint8_t slcd_getcontrast(void)
{
return (getreg32(STM32_LCD_FCR) & LCD_FCR_CC_MASK) >> LCD_FCR_CC_SHIFT;
}
#endif
/****************************************************************************
* Name: slcd_setcontrast
****************************************************************************/
#if 0 /* Not used */
static int slcd_setcontrast(uint8_t contrast)
{
uint2_t regval;
uint32_t regval;
int ret = OK;
/* Make sure that the contrast setting is within range */
@ -513,14 +509,13 @@ static int slcd_setcontrast(uint8_t contrast)
regval &= !LCD_FCR_CC_MASK;
regval |= contrast << LCD_FCR_CC_SHIFT;
putreg32(regval, STM32_LCD_FCR);
return ret;
}
#endif
/****************************************************************************
* Name: slcd_writebar
****************************************************************************/
#if 0 /* Not used */
static void slcd_writebar(void)
{
uint32_t regval;
@ -544,14 +539,12 @@ static void slcd_writebar(void)
regval |= (uint32_t)(g_slcdstate.bar[1] << 12);
putreg32(regval, STM32_LCD_RAM3L);
/* Set the UDR bit to transfer the updated data to the second level
* buffer.
*/
putreg32(1, SLCD_SR_UDR_BB);
}
#endif
/****************************************************************************
* Name: slcd_mapch
@ -1120,6 +1113,132 @@ static ssize_t slcd_write(FAR struct file *filp,
return (ssize_t)len;
}
/****************************************************************************
* Name: slcd_poll
****************************************************************************/
static int slcd_ioctl(FAR struct file *filp, int cmd, unsigned long arg)
{
switch (cmd)
{
/* SLCDIOC_GEOMETRY: Get the SLCD geometry (rows x characters)
*
* argument: Pointer to struct slcd_geometry_s in which values will be
* returned
*/
case SLCDIOC_GEOMETRY:
{
FAR struct slcd_geometry_s *geo = (FAR struct slcd_geometry_s *)((uintptr_t)arg);
if (!geo)
{
return -EINVAL;
}
geo->nrows = SLCD_NROWS;
geo->ncolumns = SLCD_NCHARS;
}
break;
/* SLCDIOC_SETBAR: Set bars on a bar display
*
* argument: 32-bit bitset, with each bit corresponding to one bar.
*/
case SLCDIOC_SETBAR:
{
/* Format the bar */
g_slcdstate.bar[0] = 0;
g_slcdstate.bar[1] = 0;
if ((arg & 1) != 0)
{
SCLD_BAR0_ON;
}
if ((arg & 2) != 0)
{
SCLD_BAR1_ON;
}
if ((arg & 4) != 0)
{
SCLD_BAR2_ON;
}
if ((arg & 8) != 0)
{
SCLD_BAR3_ON;
}
/* Write the bar to SLCD memory */
slcd_writebar();
}
break;
/* SLCDIOC_GETCONTRAST: Get the current contrast setting
*
* argument: Pointer type int that will receive the current contrast
* setting
*/
case SLCDIOC_GETCONTRAST:
{
FAR int *contrast = (FAR int *)((uintptr_t)arg);
if (!contrast)
{
return -EINVAL;
}
*contrast = (int)slcd_getcontrast();
}
break;
/* SLCDIOC_MAXCONTRAST: Get the maximum contrast setting
*
* argument: Pointer type int that will receive the maximum contrast
* setting
*/
case SLCDIOC_MAXCONTRAST:
{
FAR int *contrast = (FAR int *)((uintptr_t)arg);
if (!contrast)
{
return -EINVAL;
}
*contrast = SLCD_MAXCONTRAST;
}
break;
/* SLCDIOC_SETCONTRAST: Set the contrast to a new value
*
* argument: The new contrast value
*/
case SLCDIOC_SETCONTRAST:
{
if (arg > SLCD_MAXCONTRAST)
{
return -ERANGE;
}
return slcd_setcontrast((uint8_t)arg);
}
break;
default:
return -ENOTTY;
}
return OK;
}
/****************************************************************************
* Name: slcd_poll
****************************************************************************/
@ -1130,7 +1249,7 @@ static int slcd_poll(FAR struct file *filp, FAR struct pollfd *fds,
{
if (setup)
{
/* Data is always avaialble to be read */
/* Data is always avaialble to be read / Data can always be written */
fds->revents |= (fds->events & (POLLIN|POLLOUT));
if (fds->revents != 0)
@ -1148,11 +1267,11 @@ static int slcd_poll(FAR struct file *filp, FAR struct pollfd *fds,
****************************************************************************/
/****************************************************************************
* Name: stm32_slcd_initialize
* Name: stm32_slcd_initialize
*
* Description:
* Initialize the STM32L-Discovery hardware and register the character
* driver.
* Initialize the STM32L-Discovery LCD hardware and register the character
* driver as /dev/slcd.
*
****************************************************************************/