PCB-Logic PIC32MX LCD1602 driver now supports SLCD CODED; Added an SLCD ioctl command to get cursor position
This commit is contained in:
Gregory Nutt
parent
4867c1f891
commit
6c64f9286a
@ -71,14 +71,18 @@
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <semaphore.h>
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#include <poll.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/ascii.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/lcd/hd4478ou.h>
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#include <nuttx/lcd/slcd_ioctl.h>
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#include <nuttx/lcd/slcd_codec.h>
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#include "up_arch.h"
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#include "pic32mx-pmp.h"
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@ -116,6 +120,13 @@
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#define GPIO_LCD_RS (GPIO_OUTPUT|GPIO_VALUE_ZERO|GPIO_PORTB|GPIO_PIN15)
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/* LCD **********************************************************************/
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#define LCD_NROWS 2
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#define LCD_NCOLUMNS 16
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#define LCD_NCHARS (LCD_NROWS * LCD_NCOLUMNS)
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/* Debug ********************************************************************/
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#ifdef CONFIG_DEBUG_LCD
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@ -130,20 +141,53 @@
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* Private Type Definition
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****************************************************************************/
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/* SLCD incoming stream structure */
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struct lcd_instream_s
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{
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struct lib_instream_s stream;
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FAR const char *buffer;
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ssize_t nbytes;
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};
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/* Global LCD state */
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struct lcd1602_2
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{
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bool initialized; /* True: Completed initialization sequence */
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uint8_t currow; /* Current row */
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uint8_t curcol; /* Current column */
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};
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/****************************************************************************
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* Private Function Protototypes
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****************************************************************************/
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/* Debug */
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#if defined(CONFIG_DEBUG_LCD) && defined(CONFIG_DEBUG_VERBOSE)
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static void lcd_dumpstate(FAR const char *msg);
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#else
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# define lcd_dumpstate(msg)
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#endif
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/* Internal functions */
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static int lcd_getstream(FAR struct lib_instream_s *instream);
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static void lcd_wrcommand(uint8_t cmd);
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static void lcd_wrdata(uint8_t data);
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static uint8_t lcd_rddata(void);
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static uint8_t lcd_readch(uint8_t row, uint8_t column);
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static void lcd_writech(uint8_t ch, uint8_t row, uint8_t column);
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static void lcd_appendch(uint8_t ch);
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static void lcd_action(enum slcdcode_e code, uint8_t count);
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/* Character driver operations */
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static ssize_t lcd_read(FAR struct file *, FAR char *, size_t);
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static ssize_t lcd_write(FAR struct file *, FAR const char *, size_t);
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static int lcd_ioctl(FAR struct file *filp, int cmd, unsigned long arg);
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#ifndef CONFIG_DISABLE_POLL
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static int lcd_poll(FAR struct file *filp, FAR struct pollfd *fds,
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bool setup);
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static int lcd_poll(FAR struct file *filp, FAR struct pollfd *fds, bool setup);
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#endif
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/****************************************************************************
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@ -159,7 +203,7 @@ static const struct file_operations g_lcdops =
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lcd_read, /* read */
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lcd_write, /* write */
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0, /* seek */
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0 /* ioctl */
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lcd_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, lcd_poll /* poll */
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#endif
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@ -173,6 +217,62 @@ static struct lcd1602_2 g_lcd1602;
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lcd_dumpstate
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****************************************************************************/
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#if defined(CONFIG_DEBUG_LCD) && defined(CONFIG_DEBUG_VERBOSE)
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static void lcd_dumpstate(FAR const char *msg)
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{
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uint8_t buffer[LCD_NCOLUMNS];
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uint8_t row;
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uint8_t column;
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lcdvdbg("%s:\n", msg);
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lcdvdbg(" currow: %d curcol: %d\n",
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g_lcd1602.currow, g_lcd1602.curcol);
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for (row = 0, column = 0; row < LCD_NROWS; )
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{
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buffer[column] = lcd_readch(row, column);
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if (++column >= LCD_NCOLUMNS)
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{
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lcdvdbg(" %c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n",
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buffer[0], buffer[1], buffer[2], buffer[3],
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buffer[4], buffer[5], buffer[6], buffer[7],
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buffer[8], buffer[9], buffer[10], buffer[11],
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buffer[12], buffer[13], buffer[14], buffer[15]);
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column = 0;
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row++;
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}
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}
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}
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#endif
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/****************************************************************************
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* Name: lcd_getstream
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*
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* Description:
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* Get one character from the keyboard.
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*
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****************************************************************************/
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static int lcd_getstream(FAR struct lib_instream_s *instream)
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{
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FAR struct lcd_instream_s *lcdstream = (FAR struct lcd_instream_s *)instream;
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DEBUGASSERT(lcdstream && lcdstream->buffer);
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if (lcdstream->nbytes > 0)
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{
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lcdstream->nbytes--;
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lcdstream->stream.nget++;
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return (int)*lcdstream->buffer++;
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}
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return EOF;
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}
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/****************************************************************************
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* Name: lcd_wrcommand
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*
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@ -230,37 +330,486 @@ static uint8_t lcd_rddata(void)
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return (uint8_t)getreg32(PIC32MX_PMP_DIN);
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}
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/****************************************************************************
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* Name: lcd_readch
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****************************************************************************/
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static uint8_t lcd_readch(uint8_t row, uint8_t column)
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{
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uint8_t addr;
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/* Set the cursor position. Internally, the HD44780U supports a display
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* size of up to 2x40 addressed as follows:
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*
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* Column 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ... 39
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* Row 0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f ... 27
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* Ro1 1 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f ... 67
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*/
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addr = column;
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if (row > 0)
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{
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addr |= HD4478OU_DDRAM_ROW1;
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}
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lcd_wrcommand(HD4478OU_DDRAM_AD(addr));
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/* And write the character here */
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return lcd_rddata();
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}
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/****************************************************************************
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* Name: lcd_writech
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****************************************************************************/
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static void lcd_writech(uint8_t ch, uint8_t row, uint8_t column)
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{
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uint8_t addr;
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/* Set the cursor position. Internally, the HD44780U supports a display
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* size of up to 2x40 addressed as follows:
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*
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* Column 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ... 39
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* Row 0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f ... 27
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* Ro1 1 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f ... 67
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*/
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addr = column;
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if (row > 0)
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{
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addr |= HD4478OU_DDRAM_ROW1;
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}
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lcd_wrcommand(HD4478OU_DDRAM_AD(addr));
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/* And write the character here */
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lcd_wrdata(ch);
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}
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/****************************************************************************
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* Name: lcd_appendch
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****************************************************************************/
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static void lcd_appendch(uint8_t ch)
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{
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if (g_lcd1602.curcol < LCD_NCOLUMNS)
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{
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lcd_writech(ch, g_lcd1602.currow, g_lcd1602.curcol);
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g_lcd1602.curcol++;
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}
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}
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/****************************************************************************
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* Name: lcd_action
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****************************************************************************/
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static void lcd_action(enum slcdcode_e code, uint8_t count)
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{
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lcdvdbg("Action: %d count: %d\n", code, count);
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lcd_dumpstate("BEFORE ACTION");
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switch (code)
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{
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/* Erasure */
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case SLCDCODE_BACKDEL: /* Backspace (backward delete) N characters */
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{
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/* If we are at the home position, then ignore the action */
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if (g_lcd1602.curcol < 1)
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{
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break;
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}
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/* Otherwise, BACKDEL is like moving the cursor back one then doing a
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* forward deletion. Decrement the cursor position and fall through.
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*/
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g_lcd1602.curcol--;
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}
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case SLCDCODE_FWDDEL: /* DELete (forward delete) N characters moving text */
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{
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uint8_t ch;
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int i;
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/* Move all characters after the current cursor position left by one */
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for (i = g_lcd1602.curcol + 1; i < LCD_NCOLUMNS - 1; i++)
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{
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ch = lcd_readch(g_lcd1602.currow, i);
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lcd_writech(ch, g_lcd1602.currow, i - 1);
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}
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/* Erase the last character on the display */
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lcd_writech(' ', g_lcd1602.currow, LCD_NCOLUMNS - 1);
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}
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break;
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case SLCDCODE_ERASE: /* Erase N characters from the cursor position */
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{
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int last;
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int i;
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/* Get the last position to clear and make sure that the last
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* position is on the SLCD.
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*/
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last = g_lcd1602.curcol + count - 1;
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if (last >= LCD_NCOLUMNS)
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{
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last = LCD_NCOLUMNS - 1;
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}
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/* Erase N characters after the current cursor position left by one */
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for (i = g_lcd1602.curcol; i < last; i++)
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{
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lcd_writech(' ', g_lcd1602.currow, i);
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}
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}
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break;
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case SLCDCODE_CLEAR: /* Home the cursor and erase the entire display */
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{
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/* Clear the display */
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lcd_wrcommand(HD4478OU_CLEAR);
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/* And home the cursor */
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g_lcd1602.currow = 0;
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g_lcd1602.curcol = 0;
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}
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break;
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case SLCDCODE_ERASEEOL: /* Erase from the cursor position to the end of line */
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{
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int i;
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/* Erase characters after the current cursor position to the end of the line */
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for (i = g_lcd1602.curcol; i < LCD_NCOLUMNS; i++)
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{
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lcd_writech(' ', g_lcd1602.currow, i);
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}
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}
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break;
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/* Cursor movement */
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case SLCDCODE_HOME: /* Cursor home */
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{
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g_lcd1602.currow = 0;
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g_lcd1602.curcol = 0;
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}
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break;
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case SLCDCODE_END: /* Cursor end */
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{
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g_lcd1602.curcol = LCD_NCOLUMNS - 1;
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}
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break;
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case SLCDCODE_LEFT: /* Cursor left by N characters */
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{
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/* Don't permit movement past the beginning of the SLCD */
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if (g_lcd1602.curcol > 0)
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{
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g_lcd1602.curcol--;
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}
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}
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break;
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case SLCDCODE_RIGHT: /* Cursor right by N characters */
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{
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/* Don't permit movement past the end of the SLCD */
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if (g_lcd1602.curcol < (LCD_NCOLUMNS - 1))
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{
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g_lcd1602.curcol++;
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}
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}
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break;
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case SLCDCODE_UP: /* Cursor up by N lines */
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{
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/* Don't permit movement past the top of the SLCD */
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if (g_lcd1602.currow > 0)
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{
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g_lcd1602.currow--;
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}
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}
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break;
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case SLCDCODE_DOWN: /* Cursor down by N lines */
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{
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/* Don't permit movement past the bottom of the SLCD */
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if (g_lcd1602.curcol < (LCD_NCOLUMNS - 1))
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{
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g_lcd1602.curcol++;
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}
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}
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break;
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case SLCDCODE_PAGEUP: /* Cursor up by N pages */
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case SLCDCODE_PAGEDOWN: /* Cursor down by N pages */
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break; /* Not supportable on this SLCD */
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/* Blinking */
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case SLCDCODE_BLINKSTART: /* Start blinking with current cursor position */
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case SLCDCODE_BLINKEND: /* End blinking after the current cursor position */
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case SLCDCODE_BLINKOFF: /* Turn blinking off */
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break; /* Not implemented */
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/* These are actually unreportable errors */
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default:
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case SLCDCODE_NORMAL: /* Not a special keycode */
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break;
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}
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lcd_dumpstate("AFTER ACTION");
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}
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/****************************************************************************
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* Name: lcd_read
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****************************************************************************/
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static ssize_t lcd_read(FAR struct file *filp, FAR char *buffer, size_t len)
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{
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int i;
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uint8_t row;
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uint8_t column;
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int nread;
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for (i = 0; i < len; i++)
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/* Try to read the entire display. Notice that the seek offset
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* (filp->f_pos) is ignored. It probably should be taken into account
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* and also updated after each read and write.
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*/
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row = 0;
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column = 0;
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for (nread = 0; nread < len; nread++)
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{
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*buffer++ = lcd_rddata();
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*buffer++ = lcd_readch(row, column);
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if (++column >= LCD_NCOLUMNS)
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{
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column = 0;
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if (++row >= LCD_NROWS)
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{
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break;
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}
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}
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}
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return len;
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return nread;
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}
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/****************************************************************************
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* Name: lcd_write
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****************************************************************************/
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static ssize_t lcd_write(FAR struct file *filp, FAR const char *buffer, size_t len)
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static ssize_t lcd_write(FAR struct file *filp, FAR const char *buffer,
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size_t len)
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{
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int i;
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struct lcd_instream_s instream;
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struct slcdstate_s state;
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enum slcdret_e result;
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uint8_t ch;
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uint8_t count;
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uint8_t prev = ' ';
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bool valid = false;
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for (i = 0; i < len; i++)
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/* Initialize the stream for use with the SLCD CODEC */
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instream.stream.get = lcd_getstream;
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instream.stream.nget = 0;
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instream.buffer = buffer;
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instream.nbytes = len;
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/* Prime the pump */
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memset(&state, 0, sizeof(struct slcdstate_s));
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result = slcd_decode(&instream.stream, &state, &prev, &count);
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lcdvdbg("slcd_decode returned result=%d char=%d count=%d\n",
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result, prev, count);
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switch (result)
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{
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uint8_t data = *buffer++;
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lcd_wrdata(data);
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case SLCDRET_CHAR:
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valid = true;
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break;
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case SLCDRET_SPEC:
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{
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lcd_action((enum slcdcode_e)prev, count);
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prev = ' ';
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}
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break;
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case SLCDRET_EOF:
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return 0;
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}
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return len;
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/* Now decode and process every byte in the input buffer */
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while ((result = slcd_decode(&instream.stream, &state, &ch, &count)) != SLCDRET_EOF)
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{
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lcdvdbg("slcd_decode returned result=%d char=%d count=%d\n",
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result, ch, count);
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if (result == SLCDRET_CHAR) /* A normal character was returned */
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{
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/* Check for ASCII control characters */
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if (ch < ASCII_SPACE)
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{
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/* All are ignored except for backspace and carriage return */
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if (ch == ASCII_BS)
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{
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lcd_action(SLCDCODE_BACKDEL, 1);
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}
|
||||
else if (ch == ASCII_CR)
|
||||
{
|
||||
lcd_action(SLCDCODE_HOME, 0);
|
||||
}
|
||||
}
|
||||
|
||||
/* Handle characters decoreated with a period or a colon */
|
||||
|
||||
else if (ch == '.')
|
||||
{
|
||||
/* Write the previous character with the decimal point appended */
|
||||
|
||||
lcd_appendch(prev);
|
||||
prev = ' ';
|
||||
valid = false;
|
||||
}
|
||||
else if (ch == ':')
|
||||
{
|
||||
/* Write the previous character with the colon appended */
|
||||
|
||||
lcd_appendch(prev);
|
||||
prev = ' ';
|
||||
valid = false;
|
||||
}
|
||||
|
||||
/* Handle ASCII_DEL */
|
||||
|
||||
else if (ch == ASCII_DEL)
|
||||
{
|
||||
lcd_action(SLCDCODE_FWDDEL, 1);
|
||||
}
|
||||
|
||||
/* The rest of the 7-bit ASCII characters are fair game */
|
||||
|
||||
else if (ch < 128)
|
||||
{
|
||||
/* Write the previous character if it valid */
|
||||
|
||||
if (valid)
|
||||
{
|
||||
lcd_appendch(prev);
|
||||
}
|
||||
|
||||
/* There is now a valid output character */
|
||||
|
||||
prev = ch;
|
||||
valid = true;
|
||||
}
|
||||
}
|
||||
else /* (result == SLCDRET_SPEC) */ /* A special SLCD action was returned */
|
||||
{
|
||||
lcd_action((enum slcdcode_e)ch, count);
|
||||
}
|
||||
}
|
||||
|
||||
/* Handle any unfinished output */
|
||||
|
||||
if (valid)
|
||||
{
|
||||
lcd_appendch(prev);
|
||||
}
|
||||
|
||||
/* Assume that the entire input buffer was processed */
|
||||
|
||||
return (ssize_t)len;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: lcd_ioctl
|
||||
****************************************************************************/
|
||||
|
||||
static int lcd_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);
|
||||
|
||||
lcdvdbg("SLCDIOC_GEOMETRY: nrows=%d ncolumns=%d\n", LCD_NROWS, LCD_NCOLUMNS);
|
||||
|
||||
if (!geo)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
geo->nrows = LCD_NROWS;
|
||||
geo->ncolumns = LCD_NCOLUMNS;
|
||||
geo->nbars = 0;
|
||||
}
|
||||
break;
|
||||
|
||||
/* SLCDIOC_CURPOS: Get the SLCD cursor positioni (rows x characters)
|
||||
*
|
||||
* argument: Pointer to struct slcd_curpos_s in which values will be
|
||||
* returned
|
||||
*/
|
||||
|
||||
|
||||
case SLCDIOC_CURPOS:
|
||||
{
|
||||
FAR struct slcd_curpos_s *curpos = (FAR struct slcd_curpos_s *)((uintptr_t)arg);
|
||||
|
||||
lcdvdbg("SLCDIOC_CURPOS: row=%d column=%d\n", g_lcd1602.currow, g_lcd1602.curcol);
|
||||
|
||||
if (!curpos)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
curpos->row = g_lcd1602.currow;
|
||||
curpos->column = g_lcd1602.curcol;
|
||||
}
|
||||
break;
|
||||
|
||||
case SLCDIOC_SETBAR: /* SLCDIOC_SETBAR: Set bars on a bar display */
|
||||
case SLCDIOC_GETCONTRAST: /* SLCDIOC_GETCONTRAST: Get the current contrast setting */
|
||||
case SLCDIOC_MAXCONTRAST: /* SLCDIOC_MAXCONTRAST: Get the maximum contrast setting */
|
||||
case SLCDIOC_SETCONTRAST: /* SLCDIOC_SETCONTRAST: Set the contrast to a new value */
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
|
||||
@ -788,7 +788,7 @@ Configuration sub-directories
|
||||
4. To enable SLCD support:
|
||||
|
||||
Board Selection:
|
||||
CONFIG_ARCH_LEDS=y : Disable LED support
|
||||
CONFIG_ARCH_LEDS=n : Disable LED support
|
||||
|
||||
Library Routines:
|
||||
CONFIG_LIB_SLCDCODEC=y : Enable the SLCD CODEC
|
||||
|
||||
@ -59,6 +59,7 @@
|
||||
#include <nuttx/ascii.h>
|
||||
#include <nuttx/streams.h>
|
||||
#include <nuttx/fs/fs.h>
|
||||
#include <nuttx/lcd/slcd_ioctl.h>
|
||||
#include <nuttx/lcd/slcd_codec.h>
|
||||
|
||||
#include "up_arch.h"
|
||||
@ -313,8 +314,8 @@ static void slcd_writebar(void);
|
||||
static inline uint16_t slcd_mapch(uint8_t ch);
|
||||
static inline void slcd_writemem(uint16_t segset, int curpos);
|
||||
static void slcd_writech(uint8_t ch, uint8_t curpos, uint8_t options);
|
||||
static inline void slcd_appendch(uint8_t ch, uint8_t options);
|
||||
static inline void slcd_action(enum slcdcode_e code, uint8_t count);
|
||||
static void slcd_appendch(uint8_t ch, uint8_t options);
|
||||
static void slcd_action(enum slcdcode_e code, uint8_t count);
|
||||
|
||||
/* Character driver methods */
|
||||
|
||||
@ -999,7 +1000,7 @@ static void slcd_action(enum slcdcode_e code, uint8_t count)
|
||||
|
||||
case SLCDCODE_RIGHT: /* Cursor right by N characters */
|
||||
{
|
||||
/* Don't permit movement past the lcd of the SLCD */
|
||||
/* Don't permit movement past the end of the SLCD */
|
||||
|
||||
if (g_slcdstate.curpos < (SLCD_NCHARS - 1))
|
||||
{
|
||||
@ -1040,6 +1041,11 @@ static ssize_t slcd_read(FAR struct file *filp, FAR char *buffer, size_t len)
|
||||
int ret = 0;
|
||||
int i;
|
||||
|
||||
/* Try to read the entire display. Notice that the seek offset
|
||||
* (filp->f_pos) is ignored. It probably should be taken into account
|
||||
* and also updated after each read and write.
|
||||
*/
|
||||
|
||||
for (i = 0; i < SLCD_NCHARS && ret < len; i++)
|
||||
{
|
||||
/* Return the character */
|
||||
@ -1233,6 +1239,29 @@ static int slcd_ioctl(FAR struct file *filp, int cmd, unsigned long arg)
|
||||
}
|
||||
break;
|
||||
|
||||
/* SLCDIOC_CURPOS: Get the SLCD cursor positioni (rows x characters)
|
||||
*
|
||||
* argument: Pointer to struct slcd_curpos_s in which values will be
|
||||
* returned
|
||||
*/
|
||||
|
||||
|
||||
case SLCDIOC_CURPOS:
|
||||
{
|
||||
FAR struct slcd_curpos_s *curpos = (FAR struct slcd_curpos_s *)((uintptr_t)arg);
|
||||
|
||||
lcdvdbg("SLCDIOC_CURPOS: row=0 column=%d\n", g_slcdstate.curpos);
|
||||
|
||||
if (!curpos)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
curpos->row = 0;
|
||||
curpos->column = g_slcdstate.curpos;
|
||||
}
|
||||
break;
|
||||
|
||||
/* SLCDIOC_SETBAR: Set bars on a bar display
|
||||
*
|
||||
* argument: 32-bit bitset, with each bit corresponding to one bar.
|
||||
@ -1477,7 +1506,7 @@ int stm32_slcd_initialize(void)
|
||||
|
||||
/* Register the LCD device driver */
|
||||
|
||||
ret = register_driver("/dev/slcd", &g_slcdops, 0644, (FAR struct file_operations *)&g_slcdops);
|
||||
ret = register_driver("/dev/slcd", &g_slcdops, 0644, &g_slcdstate);
|
||||
g_slcdstate.initialized = true;
|
||||
|
||||
/* Then clear the display */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user