commit 7b8b10085a264305d59c051e4b4545fb0ac689fd
parent b34bb297544ccf88682cf951526e59ac7470e770
Author: Christos Margiolis <christos@margiolis.net>
Date: Sun, 23 Jan 2022 03:45:17 +0200
set up tmr0 i think
Diffstat:
3 files changed, 410 insertions(+), 269 deletions(-)
diff --git a/c_embedded/schem/pic.sch b/c_embedded/schem/pic.sch
@@ -14,17 +14,6 @@ Comment3 ""
Comment4 ""
$EndDescr
$Comp
-L Device:LED LED1
-U 1 1 61E8F822
-P 9350 5200
-F 0 "LED1" H 9343 5325 50 0000 C CNN
-F 1 "LED" H 9343 5326 50 0001 C CNN
-F 2 "" H 9350 5200 50 0001 C CNN
-F 3 "~" H 9350 5200 50 0001 C CNN
- 1 9350 5200
- 1 0 0 -1
-$EndComp
-$Comp
L Device:R_US R1
U 1 1 61EA1FDB
P 5300 3000
@@ -203,19 +192,15 @@ Connection ~ 6550 2450
$Comp
L Sensor:BME280 BME280
U 1 1 61E953D6
-P 8600 3250
-F 0 "BME280" H 8171 3296 50 0000 R CNN
-F 1 "BME280" H 8171 3205 50 0001 R CNN
-F 2 "Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering" H 10100 2800 50 0001 C CNN
-F 3 "https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf" H 8600 3050 50 0001 C CNN
- 1 8600 3250
+P 8750 2600
+F 0 "BME280" H 8321 2646 50 0000 R CNN
+F 1 "BME280" H 8321 2555 50 0001 R CNN
+F 2 "Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering" H 10250 2150 50 0001 C CNN
+F 3 "https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf" H 8750 2400 50 0001 C CNN
+ 1 8750 2600
-1 0 0 -1
$EndComp
Wire Wire Line
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-Wire Wire Line
- 7800 3150 7800 4900
-Wire Wire Line
6650 2700 6650 2450
$Comp
L Display_Character:NHD-0420H1Z LCD
@@ -324,44 +309,79 @@ Connection ~ 6550 6150
Wire Wire Line
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Wire Wire Line
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+Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 8650 3700
+Wire Wire Line
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$Comp
-L Switch:SW_Push BTN1
-U 1 1 620E2C06
-P 9800 5200
-F 0 "BTN1" H 9800 5393 50 0000 C CNN
-F 1 "SW_Push" H 9800 5394 50 0001 C CNN
-F 2 "" H 9800 5400 50 0001 C CNN
-F 3 "~" H 9800 5400 50 0001 C CNN
- 1 9800 5200
- 1 0 0 -1
+L Device:LED LED1
+U 1 1 61E8F822
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+F 0 "LED1" H 8293 3825 50 0000 C CNN
+F 1 "LED" H 8293 3826 50 0001 C CNN
+F 2 "" H 8300 3700 50 0001 C CNN
+F 3 "~" H 8300 3700 50 0001 C CNN
+ 1 8300 3700
+ -1 0 0 1
$EndComp
Wire Wire Line
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Wire Wire Line
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+L Device:R_US R3
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+$EndComp
Wire Wire Line
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Wire Wire Line
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+L Switch:SW_Push BTN1
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+F 3 "~" H 9250 4250 50 0001 C CNN
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+ 1 0 0 -1
+$EndComp
$EndSCHEMATC
diff --git a/c_embedded/schem/pic.sch-bak b/c_embedded/schem/pic.sch-bak
@@ -14,354 +14,374 @@ Comment3 ""
Comment4 ""
$EndDescr
$Comp
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-P 8100 4650
-F 0 "LED" H 8093 4775 50 0000 C CNN
-F 1 "LED" H 8093 4776 50 0001 C CNN
-F 2 "" H 8100 4650 50 0001 C CNN
-F 3 "~" H 8100 4650 50 0001 C CNN
- 1 8100 4650
- 1 0 0 -1
-$EndComp
-$Comp
L Device:R_US R1
U 1 1 61EA1FDB
-P 4050 2450
-F 0 "R1" H 4118 2496 50 0000 L CNN
-F 1 "10kΩ" H 4118 2405 50 0000 L CNN
-F 2 "" V 4090 2440 50 0001 C CNN
-F 3 "~" H 4050 2450 50 0001 C CNN
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+F 1 "10kΩ" H 5368 2955 50 0000 L CNN
+F 2 "" V 5340 2990 50 0001 C CNN
+F 3 "~" H 5300 3000 50 0001 C CNN
+ 1 5300 3000
0 -1 -1 0
$EndComp
$Comp
L power:GNDREF GND
U 1 1 61EB279A
-P 4200 1600
-F 0 "GND" H 4288 1563 50 0000 L CNN
-F 1 "GNDREF" H 4205 1427 50 0001 C CNN
-F 2 "" H 4200 1600 50 0001 C CNN
-F 3 "" H 4200 1600 50 0001 C CNN
- 1 4200 1600
+P 5450 2150
+F 0 "GND" H 5538 2113 50 0000 L CNN
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+F 2 "" H 5450 2150 50 0001 C CNN
+F 3 "" H 5450 2150 50 0001 C CNN
+ 1 5450 2150
-1 0 0 1
$EndComp
$Comp
L Device:R_US R2
U 1 1 61ECA8DC
-P 2850 5400
-F 0 "R2" H 2918 5446 50 0000 L CNN
-F 1 "330Ω" H 2918 5355 50 0000 L CNN
-F 2 "" V 2890 5390 50 0001 C CNN
-F 3 "~" H 2850 5400 50 0001 C CNN
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$EndComp
$Comp
L Device:C_Small C1
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-P 2850 3200
-F 0 "C1" H 2942 3246 50 0000 L CNN
-F 1 "22pF" H 2942 3155 50 0000 L CNN
-F 2 "" H 2850 3200 50 0001 C CNN
-F 3 "~" H 2850 3200 50 0001 C CNN
- 1 2850 3200
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+F 3 "~" H 4100 3750 50 0001 C CNN
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-1 0 0 -1
$EndComp
$Comp
L power:GNDREF GND
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-P 3050 3350
-F 0 "GND" H 3138 3313 50 0000 L CNN
-F 1 "GNDREF" H 3055 3177 50 0001 C CNN
-F 2 "" H 3050 3350 50 0001 C CNN
-F 3 "" H 3050 3350 50 0001 C CNN
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+F 3 "" H 4300 3900 50 0001 C CNN
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1 0 0 -1
$EndComp
$Comp
L Device:C_Small C2
U 1 1 61ECA409
-P 3250 3200
-F 0 "C2" H 3342 3246 50 0000 L CNN
-F 1 "22pF" H 3342 3155 50 0000 L CNN
-F 2 "" H 3250 3200 50 0001 C CNN
-F 3 "~" H 3250 3200 50 0001 C CNN
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+F 3 "~" H 4500 3750 50 0001 C CNN
+ 1 4500 3750
1 0 0 -1
$EndComp
$Comp
-L Device:Crystal OSC
+L Device:Crystal OSC1
U 1 1 61EB43E4
-P 3050 3000
-F 0 "OSC" H 3050 3268 50 0000 C CNN
-F 1 "8MHz" H 3050 3177 50 0000 C CNN
-F 2 "" H 3050 3000 50 0001 C CNN
-F 3 "~" H 3050 3000 50 0001 C CNN
- 1 3050 3000
+P 4300 3550
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+F 3 "~" H 4300 3550 50 0001 C CNN
+ 1 4300 3550
1 0 0 -1
$EndComp
$Comp
-L MCU_Microchip_PIC16:PIC16F877A-IP PIC16F877A-IP
+L MCU_Microchip_PIC16:PIC16F877A-IP PIC16F877A-IP1
U 1 1 61E8B28E
-P 5300 3550
-F 0 "PIC16F877A-IP" H 5300 5039 50 0000 C CNN
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-F 2 "" H 5300 3550 50 0001 C CIN
-F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/39582b.pdf" H 5300 3550 50 0001 C CNN
- 1 5300 3550
+P 6550 4100
+F 0 "PIC16F877A-IP1" H 6550 5589 50 0000 C CNN
+F 1 "PIC16F877A-IP" H 6550 5590 50 0001 C CNN
+F 2 "" H 6550 4100 50 0001 C CIN
+F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/39582b.pdf" H 6550 4100 50 0001 C CNN
+ 1 6550 4100
1 0 0 -1
$EndComp
Wire Wire Line
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Wire Wire Line
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-Connection ~ 2850 3000
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+Connection ~ 4100 3550
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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-Connection ~ 3250 3000
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+Connection ~ 4500 3550
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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-Connection ~ 3050 3350
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+Connection ~ 4300 3900
$Comp
-L Simulation_SPICE:VDC V
+L Simulation_SPICE:VDC V1
U 1 1 61F2BB51
-P 4750 1000
-F 0 "V" H 4880 1046 50 0001 L CNN
-F 1 "5V" H 4620 1000 50 0000 R CNN
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-F 4 "Y" H 4750 1000 50 0001 L CNN "Spice_Netlist_Enabled"
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-F 6 "dc(1)" H 4880 909 50 0001 L CNN "Spice_Model"
- 1 4750 1000
+P 6000 1550
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+F 4 "Y" H 6000 1550 50 0001 L CNN "Spice_Netlist_Enabled"
+F 5 "V" H 6000 1550 50 0001 L CNN "Spice_Primitive"
+F 6 "dc(1)" H 6130 1459 50 0001 L CNN "Spice_Model"
+ 1 6000 1550
-1 0 0 1
$EndComp
$Comp
-L power:GNDREF GND?
+L power:GNDREF GND
U 1 1 61F5552B
-P 5300 5750
-F 0 "GND?" H 5388 5713 50 0000 L CNN
-F 1 "GNDREF" H 5305 5577 50 0001 C CNN
-F 2 "" H 5300 5750 50 0001 C CNN
-F 3 "" H 5300 5750 50 0001 C CNN
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1 0 0 -1
$EndComp
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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$Comp
-L Switch:SW_Push RSTB
+L Switch:SW_Push RSTB1
U 1 1 61FC0519
-P 3900 1950
-F 0 "RSTB" H 3900 2143 50 0000 C CNN
-F 1 "SW_Push" H 3900 2144 50 0001 C CNN
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-F 3 "~" H 3900 2150 50 0001 C CNN
- 1 3900 1950
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1 0 0 -1
$EndComp
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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+Connection ~ 6000 2450
Wire Wire Line
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-Connection ~ 5300 1900
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$Comp
L Sensor:BME280 BME280
U 1 1 61E953D6
-P 7350 2700
-F 0 "BME280" H 6921 2746 50 0000 R CNN
-F 1 "BME280" H 6921 2655 50 0001 R CNN
-F 2 "Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering" H 8850 2250 50 0001 C CNN
-F 3 "https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf" H 7350 2500 50 0001 C CNN
- 1 7350 2700
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+F 0 "BME280" H 8321 2646 50 0000 R CNN
+F 1 "BME280" H 8321 2555 50 0001 R CNN
+F 2 "Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering" H 10250 2150 50 0001 C CNN
+F 3 "https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf" H 8750 2400 50 0001 C CNN
+ 1 8750 2600
-1 0 0 -1
$EndComp
Wire Wire Line
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-Wire Wire Line
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-Wire Wire Line
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$Comp
L Display_Character:NHD-0420H1Z LCD
U 1 1 61E937A6
-P 3150 4650
-F 0 "LCD" V 3150 3806 50 0000 R CNN
-F 1 "NHD-0420H1Z" H 3150 3670 50 0001 C CNN
-F 2 "Display:NHD-0420H1Z" H 3150 3750 50 0001 C CNN
-F 3 "http://www.newhavendisplay.com/specs/NHD-0420H1Z-FSW-GBW-33V3.pdf" H 3250 4550 50 0001 C CNN
- 1 3150 4650
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+F 3 "http://www.newhavendisplay.com/specs/NHD-0420H1Z-FSW-GBW-33V3.pdf" H 4500 5100 50 0001 C CNN
+ 1 4400 5200
0 1 1 0
$EndComp
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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+Connection ~ 4100 6250
Wire Wire Line
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Wire Wire Line
- 2950 5150 3800 5150
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Wire Wire Line
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$Comp
-L Device:R_POT_US POT
+L Device:R_POT_US POT1
U 1 1 6208C3F4
-P 3800 5400
-F 0 "POT" H 3733 5446 50 0000 R CNN
-F 1 "10kΩ" H 3733 5355 50 0000 R CNN
-F 2 "" H 3800 5400 50 0001 C CNN
-F 3 "~" H 3800 5400 50 0001 C CNN
- 1 3800 5400
+P 5050 5950
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+F 2 "" H 5050 5950 50 0001 C CNN
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+ 1 5050 5950
1 0 0 -1
$EndComp
Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
+ 5300 5300 5200 5300
+Wire Wire Line
+ 5050 5800 5050 5700
+Connection ~ 5050 5700
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 5050 6250
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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-Connection ~ 3800 5150
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Wire Wire Line
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Wire Wire Line
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-Connection ~ 3800 5700
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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-Connection ~ 5300 5600
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
- 5400 5050 5400 5150
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Wire Wire Line
- 5400 5150 5300 5150
+ 8650 3200 8650 3700
+Connection ~ 8650 3700
+Wire Wire Line
+ 8450 3700 8650 3700
$Comp
-L Switch:SW_Push BTN
-U 1 1 620E2C06
-P 8550 4650
-F 0 "BTN" H 8550 4843 50 0000 C CNN
-F 1 "SW_Push" H 8550 4844 50 0001 C CNN
-F 2 "" H 8550 4850 50 0001 C CNN
-F 3 "~" H 8550 4850 50 0001 C CNN
- 1 8550 4650
- 1 0 0 -1
+L Device:LED LED1
+U 1 1 61E8F822
+P 8300 3700
+F 0 "LED1" H 8293 3825 50 0000 C CNN
+F 1 "LED" H 8293 3826 50 0001 C CNN
+F 2 "" H 8300 3700 50 0001 C CNN
+F 3 "~" H 8300 3700 50 0001 C CNN
+ 1 8300 3700
+ -1 0 0 1
$EndComp
Wire Wire Line
- 7250 3300 7250 5600
+ 8100 3700 8150 3700
Wire Wire Line
- 7250 5600 5300 5600
+ 7450 3700 7800 3700
+$Comp
+L Device:R_US R3
+U 1 1 61F053CB
+P 7950 3700
+F 0 "R3" H 8018 3746 50 0000 L CNN
+F 1 "330Ω" H 8018 3655 50 0000 L CNN
+F 2 "" V 7990 3690 50 0001 C CNN
+F 3 "~" H 7950 3700 50 0001 C CNN
+ 1 7950 3700
+ 0 -1 -1 0
+$EndComp
Wire Wire Line
- 7250 2100 7250 1400
+ 8650 2000 8650 1950
Wire Wire Line
- 7250 1400 4750 1400
+ 8650 3700 8650 6150
+$Comp
+L Switch:SW_Push BTN1
+U 1 1 620E2C06
+P 9800 5200
+F 0 "BTN1" H 9800 5393 50 0000 C CNN
+F 1 "SW_Push" H 9800 5394 50 0001 C CNN
+F 2 "" H 9800 5400 50 0001 C CNN
+F 3 "~" H 9800 5400 50 0001 C CNN
+ 1 9800 5200
+ 1 0 0 -1
+$EndComp
$EndSCHEMATC
diff --git a/c_embedded/src/main.c b/c_embedded/src/main.c
@@ -1,33 +1,134 @@
#define NO_BIT_DEFINES
#include <pic14regs.h>
#include <stdint.h>
+#include <string.h>
static __code uint16_t __at (_CONFIG) __configword =
- _FOSC_HS & _WDTE_OFF & _LVP_OFF & _WRT_OFF & _BOREN_OFF;
-
-#define LED_PORT PORTBbits.RB0
-#define LED_TRIS TRISBbits.TRISB0
+ _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)
+/*
+ * 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
+/*
+ * We want 1ms delay @ 16Mhz with 256 prescalar, the formula is:
+ *
+ * 256 - ((delay * (fosc / 1000)) / (prescalar * 4)) =
+ * 256 - ((1 * (16000000 / 1000)) / (256 * 4)) =
+ * 256 - ((1 * 16000) / (256 * 4)) =
+ * 256 - 15.625 = ~240
+ *
+ * sdcc, there's no overflow here...
+ */
+#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
+
+typedef void (*ev_handler)(void);
+
+struct timer_req {
+ ev_handler handler;
+ uint32_t rate;
+ uint32_t cnt;
+};
+
+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 struct timer_req reqs[TIMER_REQ_MAX];
+
+void
+tmr0_init(void)
+{
+ struct timer_req *r;
+ uint8_t i;
+
+ for (i = 0; i < TIMER_REQ_MAX; i++) {
+ r = &reqs[i];
+ r->handler = NULL;
+ r->rate = 0;
+ r->cnt = 0;
+ }
+ OPTION_REG = 0;
+ OPTION_REG |= TIMER_INTERNAL_CLK | TIMER_RISING_EDGE |
+ TIMER_PRESCALER_TMR0 | TIMER_PRESCALER_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;
+}
+
+int
+tmr0_set_event(ev_handler handler, uint32_t rate)
+{
+ struct timer_req *r;
+ uint8_t i;
+
+ for (i = 0; i < TIMER_REQ_MAX; i++) {
+ r = &reqs[i];
+ if (r->handler != NULL)
+ continue;
+ r->handler = handler;
+ r->rate = rate;
+ r->cnt = 0;
+ return (1);
+ }
+ return (0);
+}
void
-delay(uint16_t iter)
+tmr0_isr(void) __interrupt
{
- uint16_t i;
+ struct timer_req *r;
+ uint8_t i;
- for (i = 0; i < iter; i++)
- __asm nop __endasm;
+ if (INTCONbits.TMR0IF != 1)
+ return;
+ for (i = 0; i < TIMER_REQ_MAX; i++) {
+ r = &reqs[i];
+ if (r->handler == NULL)
+ continue;
+ if (++r->cnt == r->rate) {
+ r->handler();
+ r->cnt = 0;
+ }
+ }
+ TMR0 = TIMER_DELAY;
+ INTCONbits.TMR0IF = 0;
}
-void main(void)
+void
+led_blink(void)
{
- LED_TRIS = 0; /* Pin as output */
- LED_PORT = 0; /* LED off */
-
- while (1) {
- LED_PORT = 1; /* LED on */
- delay(30000); /* ~500ms @ 4MHz */
- LED_PORT = 0; /* LED off */
- delay(30000);
+ LED1_PORT ^= 1;
+}
+
+void
+main(void)
+{
+ tmr0_init();
+ tmr0_set_event(&led_blink, 1000); /* blink every 1 sec */
+
+ LED1_TRIS = OUTPUT;
+ LED1_PORT = 0; /* off */
+
+ for (;;) {
}
}
