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comparison: lib/unigraphic/SPI8.cpp

lib/unigraphic/SPI8.cpp

changeset 8
55021f3f1929
parent 7
5cf4034ba4e0
child 9
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equal deleted inserted replaced
7:5cf4034ba4e0 8:55021f3f1929
1 /* mbed UniGraphic library - SPI8 protocol class
2 * Copyright (c) 2015 Giuliano Dianda
3 * Released under the MIT License: http://mbed.org/license/mit
4 *
5 * Derived work of:
6 *
7 * mbed library for 240*320 pixel display TFT based on ILI9341 LCD Controller
8 * Copyright (c) 2013 Peter Drescher - DC2PD
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
11 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
13 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
14 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
16 * THE SOFTWARE.
17 */
18
19 #include "SPI8.h"
20
21
22 SPI8::SPI8(int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC)
23 : _CS(CS), _spi(mosi, miso, sclk), _reset(reset), _DC(DC)
24 {
25 _reset = 1;
26 _DC=1;
27 _CS=1;
28 _spi.format(8,0); // 8 bit spi mode 0
29 _spi.frequency(Hz);
30 hw_reset();
31 }
32
33 void SPI8::wr_cmd8(unsigned char cmd)
34 {
35 _DC.write(0); // 0=cmd
36 _spi.write(cmd); // write 8bit
37 _DC.write(1); // 1=data next
38 }
39 void SPI8::wr_data8(unsigned char data)
40 {
41 _spi.write(data); // write 8bit
42 }
43
44 void SPI8::wr_cmd16(unsigned short cmd)
45 {
46 _DC.write(0); // 0=cmd
47 _spi.write(cmd>>8); // write 8bit
48 _spi.write(cmd&0xFF); // write 8bit
49 _DC.write(1); // 1=data next
50 }
51 void SPI8::wr_data16(unsigned short data)
52 {
53 _spi.write(data>>8); // write 8bit
54 _spi.write(data&0xFF); // write 8bit
55 }
56 void SPI8::wr_gram(unsigned short data)
57 {
58 _spi.write(data>>8); // write 8bit
59 _spi.write(data&0xFF); // write 8bit
60 }
61 void SPI8::wr_gram(unsigned short data, unsigned int count)
62 {
63 if((data>>8)==(data&0xFF))
64 {
65 count<<=1;
66 while(count)
67 {
68 _spi.write(data); // write 8bit
69 count--;
70 }
71 }
72 else
73 {
74 while(count)
75 {
76 _spi.write(data>>8); // write 8bit
77 _spi.write(data&0xFF); // write 8bit
78 count--;
79 }
80 }
81 }
82 void SPI8::wr_grambuf(unsigned short* data, unsigned int lenght)
83 {
84 while(lenght)
85 {
86 _spi.write((*data)>>8); // write 8bit
87 _spi.write((*data)&0xFF); // write 8bit
88 data++;
89 lenght--;
90 }
91 }
92 unsigned short SPI8::rd_gram(bool convert)
93 {
94 unsigned int r=0;
95 _spi.write(0); // whole first byte is dummy
96 r |= _spi.write(0);
97 r <<= 8;
98 r |= _spi.write(0);
99 if(convert)
100 {
101 r <<= 8;
102 r |= _spi.write(0);
103 // gram is 18bit/pixel, if you set 16bit/pixel (cmd 3A), during writing the 16bits are expanded to 18bit
104 // during reading, you read the raw 18bit gram
105 r = RGB24to16((r&0xFF0000)>>16, (r&0xFF00)>>8, r&0xFF);// 18bit pixel padded to 24bits, rrrrrr00_gggggg00_bbbbbb00, converted to 16bit
106 }
107 _CS = 1; // force CS HIG to interupt the "read state"
108 _CS = 0;
109 return (unsigned short)r;
110 }
111 unsigned int SPI8::rd_reg_data32(unsigned char reg)
112 {
113 wr_cmd8(reg);
114 unsigned int r=0;
115
116 r |= _spi.write(0); // we get only 7bit valid, first bit was the dummy cycle
117 r <<= 8;
118 r |= _spi.write(0);
119 r <<= 8;
120 r |= _spi.write(0);
121 r <<= 8;
122 r |= _spi.write(0);
123 r <<= 1; // 32bits are aligned, now collecting bit_0
124 r |= (_spi.write(0) >> 7);
125 // we clocked 7 more bit so ILI waiting for 8th, we need to reset spi bus
126 _CS = 1; // force CS HIG to interupt the cmd
127 _CS = 0;
128 return r;
129 }
130 unsigned int SPI8::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
131 {
132 unsigned int r=0;
133 for(int regparam=1; regparam<4; regparam++) // when reading EXTC regs, first parameter is always dummy, so start with 1
134 {
135 wr_cmd8(SPIreadenablecmd); // spi-in enable cmd, 0xD9 (ili9341) or 0xFB (ili9488) or don't know
136 wr_data8(0xF0|regparam); // in low nibble specify which reg parameter we want
137 wr_cmd8(reg); // now send cmd (select register we want to read)
138 r <<= 8;
139 r |= _spi.write(0);
140 // r = _spi.write(0) >> 8; for 16bit
141 }
142 _CS = 1; // force CS HIG to interupt the cmd
143 _CS = 0;
144 return r;
145 }
146 // ILI932x specific
147 void SPI8::dummyread()
148 {
149 _spi.write(0); // dummy read
150 }
151 // ILI932x specific
152 void SPI8::reg_select(unsigned char reg, bool forread)
153 {
154 _CS = 1; //fixme: really needed?
155 _CS = 0; //fixme: really needed?
156 _spi.write(0x70);
157 _spi.write(0); // write MSB
158 _spi.write(reg); // write LSB
159 _CS = 1; //fixme: really needed?
160 _CS = 0; //fixme: really needed?
161 if(forread) _spi.write(0x73);
162 else _spi.write(0x72);
163 }
164 // ILI932x specific
165 void SPI8::reg_write(unsigned char reg, unsigned short data)
166 {
167 _CS = 1; //fixme: really needed?
168 _CS = 0; //fixme: really needed?
169 _spi.write(0x70);
170 _spi.write(0); // write MSB
171 _spi.write(reg); // write LSB
172 _CS = 1; //fixme: really needed?
173 _CS = 0; //fixme: really needed?
174 _spi.write(0x72);
175 _spi.write(data>>8);
176 _spi.write(data&0xFF);
177 }
178 // ILI932x specific
179 unsigned short SPI8::reg_read(unsigned char reg)
180 {
181 unsigned short r=0;
182 _CS = 1; //fixme: really needed?
183 _CS = 0; //fixme: really needed?
184 _spi.write(0x70);
185 _spi.write(0); // write MSB
186 _spi.write(reg); // write LSB
187 _CS = 1; //fixme: really needed?
188 _CS = 0; //fixme: really needed?
189 _spi.write(0x73);
190 _spi.write(0); // dummy read
191 r = _spi.write(0); // read 8bit
192 r <<= 8;
193 r |= _spi.write(0); // read 8bit
194 return r;
195 }
196 void SPI8::hw_reset()
197 {
198 wait_ms(15);
199 _DC = 1;
200 _CS = 1;
201 _reset = 0; // display reset
202 wait_ms(2);
203 _reset = 1; // end reset
204 wait_ms(100);
205 }
206 void SPI8::BusEnable(bool enable)
207 {
208 _CS = enable ? 0:1;
209 }

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