SSD1306 OLED display driver 1.7.8 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, 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 #define DD_MISO DDB4
39 #define DD_MOSI DDB3
40 #define DD_SS DDB2
41 #define DD_SCK DDB5
42 #define SPI_CLOCK_MASK 0x03
43 #define SPI_2XCLOCK_MASK 0x01
44
45 extern uint32_t s_ssd1306_spi_clock;
46
47 static void ssd1306_spiConfigure_avr()
48 {
49 uint8_t clockDiv;
50 uint32_t clockSetting = F_CPU / 2;
51 clockDiv = 0;
52 while ((clockDiv < 6) && (s_ssd1306_spi_clock < clockSetting))
53 {
54 clockSetting /= 2;
55 clockDiv++;
56 }
57 if (clockDiv == 6)
58 {
59 clockDiv = 7;
60 }
61 // Invert the SPI2X bit
62 clockDiv ^= 0x1;
63
64 // SS pin must be HIGH, when enabling MASTER SPI mode
65 // Otherwise, SPI will drop automatically to SLAVE mode
66 DDR_SPI &= ~((1<<DD_SCK)|(1<<DD_SS)|(1<<DD_MOSI));
67 PORT_SPI |= (1<<DD_SS);
68 /* Define the following pins as output */
69 DDR_SPI |= ((1<<DD_MOSI)|(1<<DD_SCK)|(1<<DD_SS));
70 PORT_SPI |= (1<<DD_SS);
71
72 SPCR = (1<<SPE)|(1<<MSTR)|(0<<CPOL)|(0<<CPHA)|
73 ((clockDiv >> 1) & SPI_CLOCK_MASK);
74 SPSR = clockDiv & SPI_2XCLOCK_MASK; // Double Clock Rate
75 // Wait for some time to give SPI HW module to initialize
76 delay(10);
77 }
78
79 static void ssd1306_spiClose_avr()
80 {
81 }
82
83 static void ssd1306_spiStart_avr()
84 {
85 if (s_ssd1306_cs >= 0)
86 {
87 digitalWrite(s_ssd1306_cs,LOW);
88 }
89 }
90
91 static void ssd1306_spiSendByte_avr(uint8_t data)
92 {
93 SPDR = data;
94 asm volatile("nop");
95 while((SPSR & (1<<SPIF))==0);
96 }
97
98 static void ssd1306_spiSendBytes_avr(const uint8_t * buffer, uint16_t size)
99 {
100 const uint8_t *p = buffer;
101 while (size--)
102 {
103 SPDR = *p;
104 asm volatile("nop"); // to improve speed
105 while((SPSR & (1<<SPIF))==0);
106 SPDR; // read SPI input
107 p++;
108 }
109 }
110
111 static void ssd1306_spiStop_avr()
112 {
113 if (ssd1306_lcd.type == LCD_TYPE_PCD8544)
114 {
115 digitalWrite(s_ssd1306_dc, LOW);
116 ssd1306_spiSendByte_avr( 0x00 ); // Send NOP command to allow last data byte to pass (bug in PCD8544?)
117 // ssd1306 E3h is NOP command
118 }
119 if (s_ssd1306_cs >= 0)
120 {
121 digitalWrite(s_ssd1306_cs, HIGH);
122 }
123 }
124
125 void ssd1306_spiInit_avr(int8_t cesPin, int8_t dcPin)
126 {
127 if (cesPin >=0) pinMode(cesPin, OUTPUT);
128 if (dcPin >= 0) pinMode(dcPin, OUTPUT);
129 if (cesPin) s_ssd1306_cs = cesPin;
130 if (dcPin) s_ssd1306_dc = dcPin;
131 ssd1306_intf.spi = 1;
132 ssd1306_spiConfigure_avr();
133 ssd1306_intf.start = ssd1306_spiStart_avr;
134 ssd1306_intf.stop = ssd1306_spiStop_avr;
135 ssd1306_intf.send = ssd1306_spiSendByte_avr;
136 ssd1306_intf.send_buffer = ssd1306_spiSendBytes_avr;
137 ssd1306_intf.close = ssd1306_spiClose_avr;
138 }
139
140 #endif
141
142
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:125
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:32
ssd1306_intf
ssd1306_interface_t ssd1306_intf
Definition: ssd1306_interface.c:29
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