SSD1306 OLED display driver 1.8.2 This library is developed to control SSD1306/SSD1331/SSD1351/IL9163/PCD8554 RGB i2c/spi LED displays

ssd1306_spi_avr.c
1 /*
2 MIT License
3
4 Copyright (c) 2018-2019, Alexey Dynda
5
6 Permission is hereby granted, free of charge, to any person obtaining a copy
7 of this software and associated documentation files (the "Software"), to deal
8 in the Software without restriction, including without limitation the rights
9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 copies of the Software, and to permit persons to whom the Software is
11 furnished to do so, subject to the following conditions:
12
13 The above copyright notice and this permission notice shall be included in all
14 copies or substantial portions of the Software.
15
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 SOFTWARE.
23 */
24
25 #include "ssd1306_spi_avr.h"
26 #include "ssd1306_spi.h"
27
28 #include "intf/ssd1306_interface.h"
29 #include "lcd/lcd_common.h"
30 #include "ssd1306_hal/io.h"
31
32 #if defined(CONFIG_AVR_SPI_AVAILABLE) && defined(CONFIG_AVR_SPI_ENABLE)
33
34 #include <stdlib.h>
35
36 #define PORT_SPI PORTB
37 #define DDR_SPI DDRB
38
39 #if defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
40 #define DD_MISO DDB3
41 #define DD_MOSI DDB2
42 #define DD_SCK DDB1
43 #define DD_SS DDB0
44 #else
45 #define DD_MISO DDB4
46 #define DD_MOSI DDB3
47 #define DD_SCK DDB5
48 #define DD_SS DDB2
49 #endif
50
51 #define SPI_CLOCK_MASK 0x03
52 #define SPI_2XCLOCK_MASK 0x01
53
54 extern uint32_t s_ssd1306_spi_clock;
55
56 static void ssd1306_spiConfigure_avr()
57 {
58 uint8_t clockDiv;
59 uint32_t clockSetting = F_CPU / 2;
60 clockDiv = 0;
61 while ((clockDiv < 6) && (s_ssd1306_spi_clock < clockSetting))
62 {
63 clockSetting /= 2;
64 clockDiv++;
65 }
66 if (clockDiv == 6)
67 {
68 clockDiv = 7;
69 }
70 // Invert the SPI2X bit
71 clockDiv ^= 0x1;
72
73 // SS pin must be HIGH, when enabling MASTER SPI mode
74 // Otherwise, SPI will drop automatically to SLAVE mode
75 DDR_SPI &= ~((1<<DD_SCK)|(1<<DD_SS)|(1<<DD_MOSI));
76 PORT_SPI |= (1<<DD_SS);
77 /* Define the following pins as output */
78 DDR_SPI |= ((1<<DD_MOSI)|(1<<DD_SCK)|(1<<DD_SS));
79 PORT_SPI |= (1<<DD_SS);
80
81 SPCR = (1<<SPE)|(1<<MSTR)|(0<<CPOL)|(0<<CPHA)|
82 ((clockDiv >> 1) & SPI_CLOCK_MASK);
83 SPSR = clockDiv & SPI_2XCLOCK_MASK; // Double Clock Rate
84 // Wait for some time to give SPI HW module to initialize
85 delay(10);
86 }
87
88 static void ssd1306_spiClose_avr()
89 {
90 }
91
92 static void ssd1306_spiStart_avr()
93 {
94 if (s_ssd1306_cs >= 0)
95 {
96 digitalWrite(s_ssd1306_cs,LOW);
97 }
98 }
99
100 static void ssd1306_spiSendByte_avr(uint8_t data)
101 {
102 SPDR = data;
103 asm volatile("nop");
104 while((SPSR & (1<<SPIF))==0);
105 }
106
107 static void ssd1306_spiSendBytes_avr(const uint8_t * buffer, uint16_t size)
108 {
109 while (size--)
110 {
111 SPDR = *buffer;
112 asm volatile("nop"); // to improve speed
113 while((SPSR & (1<<SPIF))==0);
114 SPDR; // read SPI input
115 buffer++;
116 }
117 }
118
119 static void ssd1306_spiStop_avr()
120 {
121 if (ssd1306_lcd.type == LCD_TYPE_PCD8544)
122 {
123 digitalWrite(s_ssd1306_dc, LOW);
124 ssd1306_spiSendByte_avr( 0x00 ); // Send NOP command to allow last data byte to pass (bug in PCD8544?)
125 // ssd1306 E3h is NOP command
126 }
127 if (s_ssd1306_cs >= 0)
128 {
129 digitalWrite(s_ssd1306_cs, HIGH);
130 }
131 }
132
133 void ssd1306_spiInit_avr(int8_t cesPin, int8_t dcPin)
134 {
135 if (cesPin >=0) pinMode(cesPin, OUTPUT);
136 if (dcPin >= 0) pinMode(dcPin, OUTPUT);
137 if (cesPin) s_ssd1306_cs = cesPin;
138 if (dcPin) s_ssd1306_dc = dcPin;
139 ssd1306_intf.spi = 1;
140 ssd1306_spiConfigure_avr();
141 ssd1306_intf.start = ssd1306_spiStart_avr;
142 ssd1306_intf.stop = ssd1306_spiStop_avr;
143 ssd1306_intf.send = ssd1306_spiSendByte_avr;
144 ssd1306_intf.send_buffer = ssd1306_spiSendBytes_avr;
145 ssd1306_intf.close = ssd1306_spiClose_avr;
146 }
147
148 #endif
149
150
ssd1306_spi_avr.h
s_ssd1306_dc
int8_t s_ssd1306_dc
Definition: ssd1306_spi.c:34
ssd1306_interface_t::send
void(* send)(uint8_t data)
Definition: ssd1306_interface.h:70
lcd_common.h
ssd1306_interface_t::stop
void(* stop)(void)
Definition: ssd1306_interface.h:65
s_ssd1306_spi_clock
uint32_t s_ssd1306_spi_clock
Definition: ssd1306_spi.c:35
LCD_TYPE_PCD8544
Definition: lcd_common.h:55
io.h
ssd1306_spiInit_avr
void ssd1306_spiInit_avr(int8_t cesPin, int8_t dcPin)
Definition: ssd1306_spi_avr.c:133
ssd1306_spi.h
ssd1306_interface_t::start
void(* start)(void)
Definition: ssd1306_interface.h:61
ssd1306_interface_t::close
void(* close)(void)
deinitializes internal resources, allocated for interface.
Definition: ssd1306_interface.h:88
ssd1306_lcd
ssd1306_lcd_t ssd1306_lcd
Definition: lcd_common.c:33
ssd1306_intf
ssd1306_interface_t ssd1306_intf
Definition: ssd1306_interface.c:31
ssd1306_interface.h
ssd1306_interface_t::spi
uint8_t spi
Definition: ssd1306_interface.h:57
ssd1306_interface_t::send_buffer
void(* send_buffer)(const uint8_t *buffer, uint16_t size)
Sends bytes to SSD1306 device.
Definition: ssd1306_interface.h:80
ssd1306_lcd_t::type
lcd_type_t type
Definition: lcd_common.h:91
s_ssd1306_cs
int8_t s_ssd1306_cs
Definition: ssd1306_spi.c:33