commit 044eb359382d61bcbdbbc605fd4c7194c7ab6b4f
parent 7b8b10085a264305d59c051e4b4545fb0ac689fd
Author: Christos Margiolis <christos@margiolis.net>
Date: Tue, 25 Jan 2022 02:03:45 +0200
basic lcd driver done
Diffstat:
5 files changed, 571 insertions(+), 355 deletions(-)
diff --git a/c_embedded/schem/pic.pro b/c_embedded/schem/pic.pro
@@ -1,4 +1,4 @@
-update=Fri Jan 21 13:58:09 2022
+update=Tue Jan 25 02:02:50 2022
version=1
last_client=kicad
[general]
@@ -34,7 +34,7 @@ LibDir=
[schematic_editor]
version=1
PageLayoutDescrFile=layout.kicad_wks
-PlotDirectoryName=/home/christos/
+PlotDirectoryName=./
SubpartIdSeparator=0
SubpartFirstId=65
NetFmtName=
diff --git a/c_embedded/schem/pic.sch b/c_embedded/schem/pic.sch
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diff --git a/c_embedded/schem/pic.sch-bak b/c_embedded/schem/pic.sch-bak
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+F 3 "" H 3800 3000 50 0001 C CNN
+ 1 3800 3000
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 3800 3000 3850 3000
+Wire Wire Line
+ 3850 3000 3850 2500
+Wire Wire Line
+ 3850 2500 4200 2500
+Wire Wire Line
+ 4200 2500 4200 2550
+Wire Wire Line
+ 4200 3450 4200 3500
+Wire Wire Line
+ 4200 3500 3850 3500
+Wire Wire Line
+ 3850 3500 3850 3000
+Connection ~ 3850 3000
+Wire Wire Line
+ 4200 3150 4200 3250
+Wire Wire Line
+ 4200 2850 4200 2750
+Wire Wire Line
+ 3400 1950 6000 1950
+Wire Wire Line
+ 3400 6250 4100 6250
+Wire Wire Line
+ 5300 6250 5300 5200
+Wire Wire Line
+ 8850 3200 8850 3350
+Wire Wire Line
+ 8850 3350 8650 3350
+Connection ~ 8650 3350
+Wire Wire Line
+ 8850 2000 8850 1950
+Wire Wire Line
+ 8850 1950 8650 1950
+Connection ~ 8650 1950
+Wire Wire Line
+ 5050 6100 5050 6250
+Wire Wire Line
+ 5200 5950 5200 5300
+Wire Wire Line
+ 5050 5800 5050 5700
+$Comp
+L Device:R_POT_US POT1
+U 1 1 6208C3F4
+P 5050 5950
+F 0 "POT1" H 4983 5996 50 0000 R CNN
+F 1 "10kΩ" H 4983 5905 50 0000 R CNN
+F 2 "" H 5050 5950 50 0001 C CNN
+F 3 "~" H 5050 5950 50 0001 C CNN
+ 1 5050 5950
1 0 0 -1
$EndComp
+Wire Wire Line
+ 4200 3250 4650 3250
+Wire Wire Line
+ 4650 3250 4650 3500
+Wire Wire Line
+ 4650 3500 5650 3500
+Connection ~ 4200 3250
+Wire Wire Line
+ 4200 2750 4750 2750
+Wire Wire Line
+ 4750 2750 4750 3300
+Wire Wire Line
+ 4750 3300 5650 3300
+Connection ~ 4200 2750
+Wire Wire Line
+ 7450 3700 7850 3700
+Wire Wire Line
+ 7850 3700 7850 3550
+Wire Wire Line
+ 8650 3350 8650 3550
+Connection ~ 8650 3550
+Wire Wire Line
+ 8650 3550 8650 3950
+Wire Wire Line
+ 7450 3800 7850 3800
+Wire Wire Line
+ 7850 3800 7850 3950
+Wire Wire Line
+ 8550 3950 8650 3950
+Connection ~ 8650 3950
+Wire Wire Line
+ 8650 3950 8650 6150
+Wire Wire Line
+ 8600 3550 8650 3550
+$Comp
+L Device:R_US R4
+U 1 1 62134942
+P 8450 3550
+F 0 "R4" H 8518 3596 50 0000 L CNN
+F 1 "10kΩ" H 8518 3505 50 0000 L CNN
+F 2 "" V 8490 3540 50 0001 C CNN
+F 3 "~" H 8450 3550 50 0001 C CNN
+ 1 8450 3550
+ 0 -1 -1 0
+$EndComp
+Wire Wire Line
+ 8150 3950 8250 3950
+Wire Wire Line
+ 8250 3550 8300 3550
+Wire Wire Line
+ 4500 4800 4500 3700
+Wire Wire Line
+ 4500 3700 5650 3700
+Wire Wire Line
+ 4400 4800 4400 3800
+Wire Wire Line
+ 4400 3800 5650 3800
+Wire Wire Line
+ 4300 4800 4300 3900
+Wire Wire Line
+ 4300 3900 5650 3900
+Wire Wire Line
+ 4200 4800 4200 4000
+Wire Wire Line
+ 4200 4000 5650 4000
+Wire Wire Line
+ 4100 4800 4100 4100
+Wire Wire Line
+ 4100 4100 5650 4100
+Wire Wire Line
+ 4000 4800 4000 4200
+Wire Wire Line
+ 4000 4200 5650 4200
+Wire Wire Line
+ 3900 4800 3900 4300
+Wire Wire Line
+ 3900 4300 5650 4300
+Wire Wire Line
+ 3800 4800 3800 4400
+Wire Wire Line
+ 3800 4400 5650 4400
$EndSCHEMATC
diff --git a/c_embedded/schem/schem.pdf b/c_embedded/schem/schem.pdf
Binary files differ.
diff --git a/c_embedded/src/main.c b/c_embedded/src/main.c
@@ -7,15 +7,15 @@ static __code uint16_t __at (_CONFIG) __configword =
_FOSC_HS & _WDTE_OFF & _PWRTE_ON & _LVP_OFF & _WRT_OFF & _BOREN_ON &
_CPD_OFF & _CP_OFF;
-#define _XTAL_FREQ 16000000
-#define TIMER_INTERNAL_CLK (0 << 5)
-#define TIMER_RISING_EDGE (0 << 4)
-#define TIMER_PRESCALER_TMR0 (0 << 3)
+#define _XTAL_FREQ 16000000 /* Crystal oscillator running at 16MHz */
+#define TIMER_RISING_EDGE (0 << 6) /* Interrupt on rising edge */
+#define TIMER_INTERNAL_CLK (0 << 5) /* Use the CLK0 pin */
+#define TIMER_PRESCALAR_TMR0 (0 << 3) /* Assign prescalar to TMR0 */
/*
* The last 3 bits of OPTION_REG indicate the prescalar value. In this case,
* 111 indicates a prescalar value of 256.
*/
-#define TIMER_PRESCALER_256 0b111
+#define TIMER_PRESCALAR_256 0b111
/*
* We want 1ms delay @ 16Mhz with 256 prescalar, the formula is:
*
@@ -24,17 +24,37 @@ static __code uint16_t __at (_CONFIG) __configword =
* 256 - ((1 * 16000) / (256 * 4)) =
* 256 - 15.625 = ~240
*
- * sdcc, there's no overflow here...
+ * sdcc thinks there's an overflow here (hint: he's wrong)...
*/
#define TIMER_DELAY (256 - ((1 * (_XTAL_FREQ / 1000)) / (256 * 4)))
#define TIMER_REQ_MAX 3
-#define LED1_PORT PORTBbits.RB0
-#define LED1_TRIS TRISBbits.TRISB0
-
#define OUTPUT 0
#define INPUT 1
+#define BTN_PORT PORTBbits.RB0
+#define BTN_TRIS TRISBbits.TRISB0
+#define BTN_DEBOUNCE_TIME_MS 20
+
+#define LED_PORT PORTBbits.RB1
+#define LED_TRIS TRISBbits.TRISB1
+
+#define LCD_RS PORTCbits.RC0
+#define LCD_RW PORTCbits.RC1
+#define LCD_EN PORTCbits.RC2
+#define LCD_PORT_DATA PORTD
+#define LCD_SEL_INST 0
+#define LCD_SEL_DATA 1
+#define LCD_CLEAR 0x01 /* Clear screen */
+#define LCD_CURS_ZERO 0x02 /* Set cursor on (0, 0) */
+#define LCD_CURS_INC 0x06 /* Auto-increment cursor */
+#define LCD_CURS_OFF 0x0c /* Hide cursor */
+#define LCD_MODE 0x38 /* 16x2 setup */
+#define LCD_DISPLAY_INIT 0x32 /* Required */
+/* Function macros */
+#define lcd_putc(c) lcd_data(c, LCD_SEL_DATA)
+#define lcd_cmd(cmd) lcd_data(cmd, LCD_SEL_INST)
+
typedef void (*ev_handler)(void);
struct timer_req {
@@ -43,14 +63,27 @@ struct timer_req {
uint32_t cnt;
};
+static void delay_ms(uint32_t);
static void tmr0_init(void);
static int tmr0_set_event(ev_handler, uint32_t);
static void tmr0_isr(void) __interrupt;
static void led_blink(void);
+static void button_debounce(void);
+static void lcd_init(void);
+static void lcd_data(uint8_t, uint8_t);
+static void lcd_puts(const char *);
static struct timer_req reqs[TIMER_REQ_MAX];
+static uint32_t timecnt = 0; /* Seconds passed since start */
-void
+static void
+delay_ms(uint32_t t)
+{
+ while (t--)
+ __asm nop __endasm;
+}
+
+static void
tmr0_init(void)
{
struct timer_req *r;
@@ -64,18 +97,14 @@ tmr0_init(void)
}
OPTION_REG = 0;
OPTION_REG |= TIMER_INTERNAL_CLK | TIMER_RISING_EDGE |
- TIMER_PRESCALER_TMR0 | TIMER_PRESCALER_256;
+ TIMER_PRESCALAR_TMR0 | TIMER_PRESCALAR_256;
TMR0 = TIMER_DELAY;
- /*
- * Enable, TMR0 Interrupt Enable bit, Global Interrupt Enable bit
- * and Peripheral Interrupt Enable bit.
- */
- INTCONbits.TMR0IE = 1;
- INTCONbits.GIE = 1;
- INTCONbits.PEIE = 1;
+ INTCONbits.TMR0IE = 1; /* TMR0 Interrupt Enable */
+ INTCONbits.GIE = 1; /* Global Interrupt Enable */
+ INTCONbits.PEIE = 1; /* Peripheral Interrupt Enable */
}
-int
+static int
tmr0_set_event(ev_handler handler, uint32_t rate)
{
struct timer_req *r;
@@ -93,7 +122,7 @@ tmr0_set_event(ev_handler handler, uint32_t rate)
return (0);
}
-void
+static void
tmr0_isr(void) __interrupt
{
struct timer_req *r;
@@ -111,23 +140,90 @@ tmr0_isr(void) __interrupt
}
}
TMR0 = TIMER_DELAY;
- INTCONbits.TMR0IF = 0;
+ INTCONbits.TMR0IF = 0; /* Clear interrupt flags */
}
-void
+static void
led_blink(void)
{
- LED1_PORT ^= 1;
+ LED_PORT ^= 1;
+ /*
+ * Increment here since this function is called every 1 sec.
+ * No need to create another one.
+ */
+ timecnt++;
+}
+
+
+static void
+button_debounce(void)
+{
+ static uint16_t cnt = 0;
+
+ /* Button is pressed */
+ if (BTN_PORT == 0) {
+ if (cnt == 0)
+ cnt++;
+ cnt = BTN_DEBOUNCE_TIME_MS;
+ } else if (cnt != 0)
+ cnt--;
+}
+
+/* FIXME: fix delays */
+static void
+lcd_init(void)
+{
+ LCD_PORT_DATA = 0;
+ LCD_RS = 0;
+ LCD_RW = 0;
+ LCD_EN = 0;
+ TRISC = OUTPUT;
+ TRISD = OUTPUT;
+
+ lcd_cmd(LCD_DISPLAY_INIT);
+ delay_ms(150);
+ lcd_cmd(LCD_DISPLAY_INIT);
+ delay_ms(150);
+
+ lcd_cmd(LCD_MODE);
+ lcd_cmd(LCD_CURS_INC);
+ lcd_cmd(LCD_CURS_ZERO);
+ lcd_cmd(LCD_CLEAR);
+ lcd_cmd(LCD_CURS_OFF);
+}
+
+/* FIXME: fix delays */
+static void
+lcd_data(uint8_t c, uint8_t rs)
+{
+ LCD_RS = rs;
+ LCD_RW = 0;
+ LCD_EN = 1;
+ LCD_PORT_DATA = c;
+ delay_ms(500);
+ LCD_EN = 0;
+}
+
+static void
+lcd_puts(const char *str)
+{
+ while (*str != '\0')
+ lcd_putc(*str++);
}
void
main(void)
{
tmr0_init();
- tmr0_set_event(&led_blink, 1000); /* blink every 1 sec */
-
- LED1_TRIS = OUTPUT;
- LED1_PORT = 0; /* off */
+ tmr0_set_event(&led_blink, 1000); /* Blink every 1 sec */
+ tmr0_set_event(&button_debounce, 1);
+ lcd_init();
+ lcd_cmd(LCD_CURS_ZERO);
+ lcd_puts("19390133");
+
+ BTN_TRIS = INPUT;
+ LED_PORT = 1; /* LED on */
+ LED_TRIS = OUTPUT;
for (;;) {
}
