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Diffstat (limited to 'nuttx/configs/sure-pic32mx/src/pic32mx_lcd1602.c')
-rw-r--r--nuttx/configs/sure-pic32mx/src/pic32mx_lcd1602.c327
1 files changed, 256 insertions, 71 deletions
diff --git a/nuttx/configs/sure-pic32mx/src/pic32mx_lcd1602.c b/nuttx/configs/sure-pic32mx/src/pic32mx_lcd1602.c
index 9d48452b5..d12838b7d 100644
--- a/nuttx/configs/sure-pic32mx/src/pic32mx_lcd1602.c
+++ b/nuttx/configs/sure-pic32mx/src/pic32mx_lcd1602.c
@@ -37,7 +37,7 @@
*
****************************************************************************/
- /* LCD pin mapping (see configs/pcblogic-pic32mx/README.txt)
+ /* LCD pin mapping (see configs/sure-pic32mx/README.txt)
*
* --------------------- ---------- ----------------------------------
* PIC32 Sure JP1 Sure Signal Description
@@ -61,6 +61,8 @@
* 15. A +5V_DUSB
* 46 INT0/RD0 16. K Transistor circuit driven by PWM1
* --------------------- ---------- ----------------------------------
+ *
+ * Vbus power also requires Vbuson/AN5/RB5
*/
/****************************************************************************
@@ -87,7 +89,7 @@
#include <nuttx/lcd/slcd_codec.h>
#include "up_arch.h"
-#include "pic32mx-pmp.h"
+#include "pic32mx-ioport.h"
#include "pic32mx-int.h"
#include "pic32mx-internal.h"
#include "sure-pic32mx.h"
@@ -99,10 +101,6 @@
****************************************************************************/
/* Configuration ************************************************************/
-#ifndef CONFIG_PIC32MX_PMP
-# error "CONFIG_PIC32MX_PMP is required to use the LCD"
-#endif
-
#ifndef CONFIG_LCD_MAXCONTRAST
# define CONFIG_LCD_MAXCONTRAST 100
#endif
@@ -135,17 +133,14 @@
# define MAX(a,b) (a > b ? a : b)
#endif
-/* Pin configuration ********************************************************/
-/* RB15, RS -- High values selects data */
-
-#define GPIO_LCD_RS (GPIO_OUTPUT|GPIO_VALUE_ZERO|GPIO_PORTB|GPIO_PIN15)
-
/* LCD **********************************************************************/
#define LCD_NROWS 2
#define LCD_NCOLUMNS 16
#define LCD_NCHARS (LCD_NROWS * LCD_NCOLUMNS)
+#define NOP __asm__ __volatile__ ("nop");
+
/* Debug ********************************************************************/
#ifdef CONFIG_DEBUG_LCD
@@ -173,9 +168,10 @@ struct lcd_instream_s
struct lcd1602_2
{
- bool initialized; /* True: Completed initialization sequence */
- uint8_t currow; /* Current row */
- uint8_t curcol; /* Current column */
+ bool initialized; /* True: Completed initialization sequence */
+ uint8_t currow; /* Current row */
+ uint8_t curcol; /* Current column */
+ uint8_t brightness; /* Current brightness */
};
/****************************************************************************
@@ -195,9 +191,13 @@ static void lcd_dumpstream(FAR const char *msg,
/* Internal functions */
static int lcd_getstream(FAR struct lib_instream_s *instream);
+static void lcd_brightness(uint8_t brightness);
+static void lcd_shortdelay(int delay);
static void lcd_wrcommand(uint8_t cmd);
static void lcd_wrdata(uint8_t data);
static uint8_t lcd_rddata(void);
+static uint8_t lcd_readstatus(void);
+static void lcd_waitbusy(void);
static uint8_t lcd_readch(uint8_t row, uint8_t column);
static void lcd_writech(uint8_t ch, uint8_t row, uint8_t column);
static void lcd_appendch(uint8_t ch);
@@ -313,6 +313,66 @@ static int lcd_getstream(FAR struct lib_instream_s *instream)
}
/****************************************************************************
+ * Name: lcd_brightness
+ *
+ * Description:
+ * Enable for disable LCD lighting.
+ *
+ ****************************************************************************/
+
+static void lcd_brightness(uint8_t brightness)
+{
+ /* The LIGHT and COMP pins are label PWM1 and PWM2 and so are obviously
+ * intended to support modulated outputs. However, here for simplicity,
+ * they are just treated as on/off discretes outputs.
+ */
+
+ if (brightness > 0)
+ {
+ /* Turn the LCD light on */
+
+ pic32mx_gpiowrite(GPIO_LCD_LIGHT, true);
+ NOP;NOP;NOP;
+ pic32mx_gpiowrite(GPIO_LCD_COMP, true);
+ NOP;NOP;
+ pic32mx_gpiowrite(GPIO_LCD_PWR, true);
+ }
+ else
+ {
+ /* Turn the LCD light off */
+
+ pic32mx_gpiowrite(GPIO_LCD_PWR, false);
+ pic32mx_gpiowrite(GPIO_LCD_COMP, false);
+ pic32mx_gpiowrite(GPIO_LCD_LIGHT, false);
+ }
+
+ g_lcd1602.brightness = brightness;
+}
+
+/****************************************************************************
+ * Name: lcd_shortdelay
+ *
+ * Description:
+ * Small delays are needed to make some of the LCD operations work.
+ *
+ ****************************************************************************/
+
+static void lcd_shortdelay(int delay)
+{
+ volatile int loop;
+
+ /* On a 32MHz MCU, this should amount to about 300NS per loop */
+
+ while (delay-- > 0)
+ {
+ for (loop = 0; loop < 1; loop++)
+ {
+ NOP;
+ }
+ }
+}
+
+/****************************************************************************
* Name: lcd_wrcommand
*
* Description:
@@ -322,13 +382,28 @@ static int lcd_getstream(FAR struct lib_instream_s *instream)
static void lcd_wrcommand(uint8_t cmd)
{
- /* Address bit A0 is RS. Set the address latch to A0=0 */
+ /* Make sure that the LCD is available */
+
+ lcd_waitbusy();
+
+ /* Select DB0-15 as outputs (only DB-0-7 are actually used) */
+
+ putreg16(0, PIC32MX_IOPORTE_TRIS);
- putreg32(1, PIC32MX_PMP_ADDRCLR);
+ /* Set up to write the commond */
- /* And write the command to the data out register */
+ pic32mx_gpiowrite(GPIO_LCD_RS, false); /* Select command */
+ pic32mx_gpiowrite(GPIO_LCD_RW, false); /* Select write */
+ lcd_shortdelay(2);
- putreg32((uint32_t)cmd, PIC32MX_PMP_DOUT);
+ pic32mx_gpiowrite(GPIO_LCD_E, true); /* Enable transfer */
+ lcd_shortdelay(1);
+
+ /* Write the command to the LCD */
+
+ putreg16(cmd, PIC32MX_IOPORTE_PORT);
+ lcd_shortdelay(1);
+ pic32mx_gpiowrite(GPIO_LCD_E, false);
}
/****************************************************************************
@@ -341,13 +416,28 @@ static void lcd_wrcommand(uint8_t cmd)
static void lcd_wrdata(uint8_t data)
{
- /* Address bit A0 is RS. Set the address latch to A0=1 */
+ /* Make sure that the LCD is available */
+
+ lcd_waitbusy();
+
+ /* Select DB0-15 as outputs (only DB-0-7 are actually used) */
+
+ putreg16(0, PIC32MX_IOPORTE_TRIS);
+
+ /* Set up to write the data */
+
+ pic32mx_gpiowrite(GPIO_LCD_RS, true); /* Select data */
+ pic32mx_gpiowrite(GPIO_LCD_RW, false); /* Select write */
+ lcd_shortdelay(2);
- putreg32(1, PIC32MX_PMP_ADDRSET);
+ pic32mx_gpiowrite(GPIO_LCD_E, true); /* Enable transfer */
+ lcd_shortdelay(1);
- /* And write the data to the data out register */
+ /* Write the data to the LCD */
- putreg32((uint32_t)data, PIC32MX_PMP_DOUT);
+ putreg16(data, PIC32MX_IOPORTE_PORT); /* Write the data */
+ lcd_shortdelay(1);
+ pic32mx_gpiowrite(GPIO_LCD_E, false);
}
/****************************************************************************
@@ -360,13 +450,69 @@ static void lcd_wrdata(uint8_t data)
static uint8_t lcd_rddata(void)
{
- /* Address bit A0 is RS. Set the address latch to A0=1 */
+ /* Make sure that the LCD is available */
+
+ lcd_waitbusy();
+
+ /* Setup to read data */
+
+ pic32mx_gpiowrite(GPIO_LCD_RS, true); /* Select data */
+ pic32mx_gpiowrite(GPIO_LCD_RW, true); /* Select read */
+ lcd_shortdelay(2);
+
+ pic32mx_gpiowrite(GPIO_LCD_E, true); /* Enable transfer */
+ lcd_shortdelay(1);
+
+ putreg16(0xff, PIC32MX_IOPORTE_TRISSET); /* Set DB0-7 as inputs */
+ pic32mx_gpiowrite(GPIO_LCD_E, false); /* Disable transfer */
+
+ /* Read the data from the LCD */
+
+ return (uint8_t)getreg16(PIC32MX_IOPORTE_PORT);
+}
+
+/****************************************************************************
+ * Name: lcd_readstatus
+ *
+ * Description:
+ * Read the DDRAM address and busy bit.
+ *
+ ****************************************************************************/
+
+static uint8_t lcd_readstatus(void)
+{
+ uint8_t status;
+
+ /* Set up to read BUSY/AD information */
+
+ putreg16(0xff, PIC32MX_IOPORTE_TRISSET); /* Set DB0-7 as inputs */
+ pic32mx_gpiowrite(GPIO_LCD_RS, false); /* Select command */
+ pic32mx_gpiowrite(GPIO_LCD_RW, true); /* Select read */
+ lcd_shortdelay(2);
+
+ pic32mx_gpiowrite(GPIO_LCD_E, true); /* Enable transfer */
+ lcd_shortdelay(1);
+
+ /* Read the status from the LCD */
+
+ status = (uint8_t)getreg16(PIC32MX_IOPORTE_PORT);
+ lcd_shortdelay(1);
+ pic32mx_gpiowrite(GPIO_LCD_E, false);
- putreg32(1, PIC32MX_PMP_ADDRSET);
+ return status;
+}
- /* And read the data to the data in register */
+/****************************************************************************
+ * Name: lcd_waitbusy
+ *
+ * Description:
+ * Check LCD status and wait until the BUSY flag is no long set.
+ *
+ ****************************************************************************/
- return (uint8_t)getreg32(PIC32MX_PMP_DIN);
+static void lcd_waitbusy(void)
+{
+ while ((lcd_readstatus() & HD4478OU_BF) != 0);
}
/****************************************************************************
@@ -843,11 +989,46 @@ static int lcd_ioctl(FAR struct file *filp, int cmd, unsigned long arg)
}
break;
+ /* SLCDIOC_GETBRIGHTNESS: Get the current brightness setting
+ *
+ * argument: Pointer type int that will receive the current brightness
+ * setting
+ */
+
+ case SLCDIOC_GETBRIGHTNESS:
+ {
+ FAR int *brightness = (FAR int *)((uintptr_t)arg);
+ if (!brightness)
+ {
+ return -EINVAL;
+ }
+
+ *brightness = (int)g_lcd1602.brightness;
+ lcdvdbg("SLCDIOC_GETCONTRAST: brightness=%d\n", *brightness);
+ }
+ break;
+
+ /* SLCDIOC_SETBRIGHTNESS: Set the brightness to a new value
+ *
+ * argument: The new brightness value
+ */
+
+ case SLCDIOC_SETBRIGHTNESS:
+ {
+ lcdvdbg("SLCDIOC_SETCONTRAST: arg=%ld\n", arg);
+
+ if (arg > CONFIG_LCD_MAXPOWER)
+ {
+ return -ERANGE;
+ }
+
+ lcd_brightness((uint8_t)arg);
+ }
+ break;
+
case SLCDIOC_SETBAR: /* SLCDIOC_SETBAR: Set bars on a bar display */
case SLCDIOC_GETCONTRAST: /* SLCDIOC_GETCONTRAST: Get the current contrast setting */
case SLCDIOC_SETCONTRAST: /* SLCDIOC_SETCONTRAST: Set the contrast to a new value */
- case SLCDIOC_GETBRIGHTNESS: /* Get the current brightness setting */
- case SLCDIOC_SETBRIGHTNESS: /* Set the brightness to a new value */
default:
return -ENOTTY;
}
@@ -892,7 +1073,6 @@ static int lcd_poll(FAR struct file *filp, FAR struct pollfd *fds,
int up_lcd1602_initialize(void)
{
- uint32_t regval;
int ret = OK;
/* Only initialize the driver once. */
@@ -901,64 +1081,69 @@ int up_lcd1602_initialize(void)
{
lcdvdbg("Initializing\n");
- /* PMP Master mode configuration */
- /* Make sure that interrupts are disabled */
-
- putreg32(INT_PMP, PIC32MX_INT_IEC1CLR);
+ /* Configure GPIO pins */
- /* Stop and reset the PMP module and clear the mode and control registers. */
+ putreg16(0, PIC32MX_IOPORTE_TRIS); /* Set DB0-15 as outputs */
+ pic32mx_configgpio(GPIO_LCD_RS); /* RS: Selects commnand or data */
+ pic32mx_configgpio(GPIO_LCD_RW); /* RW: Selects read or write */
+ pic32mx_configgpio(GPIO_LCD_E); /* E: Starts transfer */
- putreg32(0, PIC32MX_PMP_MODE);
- putreg32(0, PIC32MX_PMP_AEN);
- putreg32(0, PIC32MX_PMP_CON);
- putreg32(0, PIC32MX_PMP_ADDR);
+ /* Configure LCD power in the OFF state */
- /* Set LCD timing values, PMP master mode 3, 8-bit mode, no address
- * increment, and no interrupts.
- */
+ pic32mx_configgpio(GPIO_LCD_LIGHT); /* K */
+ pic32mx_configgpio(GPIO_LCD_COMP); /* Vo */
+ pic32mx_configgpio(GPIO_LCD_PWR); /* Vbuson/AN5/RB5 controls +5V USB */
+ g_lcd1602.brightness = 0; /* Remember tht the light is off */
- regval = (PMP_MODE_WAITE_RD(0) | PMP_MODE_WAITM(3) | PMP_MODE_WAITB_1TPB |
- PMP_MODE_MODE_MODE1 | PMP_MODE_MODE8 | PMP_MODE_INCM_NONE |
- PMP_MODE_IRQM_NONE);
- putreg32(regval, PIC32MX_PMP_MODE);
-
- /* Enable the PMP for reading and writing
- * PMRD/PMWR is active high (1=RD; 0=WR)
- * PMENB is active high.
- * No chip selects
- * Address latch is active high
- * Enable PMRD/PMWR, PMENB, and the PMP.
+ /* A small delay is necessary between when GPIO_LCD_E was set up as an
+ * output with initial value of 0 and this operation. That delay should
+ * be well covered by the intervening GPIO configurations.
*/
-
- regval = (PMP_CON_RDSP | PMP_CON_WRSP | PMP_CON_ALP |
- PMP_CON_CSF_ADDR1415 | PMP_CON_PTRDEN | PMP_CON_PTWREN |
- PMP_CON_ADRMUX_NONE | PMP_CON_ON);
- putreg32(regval, PIC32MX_PMP_CON);
+ pic32mx_gpiowrite(GPIO_LCD_E, true); /* Enable transfer */
/* Configure and enable the LCD */
- /* Wait > 15 milliseconds afer Vdd > 4.5V */
+ /* Delay for 4.1MS or more */
- up_mdelay(100);
+ up_mdelay(5);
/* Select the 8-bit interface. BF cannot be checked before this command.
* This needs to be done a few times with some magic delays.
+ *
+ * Function set: 5x7 Style | N=2R | DL=8D
*/
- lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_DL8D | HD4478OU_FUNC_N1);
- up_mdelay(50);
- lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_DL8D | HD4478OU_FUNC_N1);
- up_udelay(50);
- lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_DL8D | HD4478OU_FUNC_N1);
- lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_DL8D | HD4478OU_FUNC_N1);
+ lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_F5x7 | HD4478OU_FUNC_N1 | HD4478OU_FUNC_DL8D);
+ up_udelay(100); /* Delay more than 100uS */
+
+ lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_F5x7 | HD4478OU_FUNC_N1 | HD4478OU_FUNC_DL8D);
+ up_udelay(40); /* Delay more than 40uS */
+ lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_F5x7 | HD4478OU_FUNC_N1 | HD4478OU_FUNC_DL8D);
+ lcd_waitbusy();
+
+ lcd_wrcommand(HD4478OU_FUNC | HD4478OU_FUNC_F5x7 | HD4478OU_FUNC_N1 | HD4478OU_FUNC_DL8D);
+ lcd_waitbusy();
- /* Configure the display */
+ /* Display ON, cursor OFF, blink OFF */
+
+ lcd_wrcommand(HD4478OU_DISPLAY | HD4478OU_DISPLAY_ON);
+ lcd_waitbusy();
+
+ /* Clear the display and home the cursor */
+
+ lcd_wrcommand(HD4478OU_CLEAR); /* Clear display */
+ lcd_waitbusy();
+
+ lcd_wrcommand(HD4478OU_RETURN); /* Return home: AC=0 */
+ lcd_waitbusy();
+
+ /* Entry Mode Set:
+ *
+ * - Increment address by one,
+ * - Shift cursor to right (display is not shifted)
+ */
- lcd_wrcommand(HD4478OU_DISPLAY); /* Display, cursor, and blink off */
- lcd_wrcommand(HD4478OU_CLEAR); /* Clear the display */
- lcd_wrcommand(HD4478OU_INPUT | HD4478OU_INPUT_INCR); /* Increment mode */
- lcd_wrcommand(HD4478OU_DISPLAY | HD4478OU_DISPLAY_ON); /* Display on, cursor and blink off */
- lcd_wrcommand(HD4478OU_DDRAM_AD(0)); /* Select DDRAM RAM AD=0 */
+ lcd_wrcommand(HD4478OU_INPUT | HD4478OU_INPUT_INCR);
/* Register the LCD device driver */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-31 17:22:52 +0000