1 | #include "spi.h"
|
2 |
|
3 | uint8_t init_spi()
|
4 | {
|
5 | #if defined (__AVR_ATmega32__)
|
6 | SPI_DDR |= (1<<SCK_PIN) | (1<<MOSI_PIN);
|
7 | SS_DDR |= (1<<SS_PIN);
|
8 | SPI_PORT &= ~((1<<SCK_PIN) | (1<<MOSI_PIN) | (1<<MISO_PIN));
|
9 | SS_PORT |= (1<<SS_PIN);
|
10 |
|
11 | SPCR = (1<<SPE) | (1 << MSTR);
|
12 | SPSR = (1<<SPI2X);
|
13 | #elif defined (__AVR_ATmega168__)
|
14 |
|
15 | SS_DDR |= (1<<SS_PIN);
|
16 | SS_PORT |= (1<<SS_PIN);
|
17 |
|
18 | SPI_DDR |= (1<<MOSI_PIN)|(1<<SCK_PIN);
|
19 | SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);
|
20 | #endif
|
21 |
|
22 | return 0;
|
23 | }
|
24 |
|
25 |
|
26 | void set_cs(uint8_t state)
|
27 | {
|
28 | if(state)
|
29 | {
|
30 | SS_PORT |= (1<<SS_PIN);
|
31 | }
|
32 | else
|
33 | {
|
34 | SS_PORT &= ~(1<<SS_PIN);
|
35 | }
|
36 | }
|
37 |
|
38 |
|
39 | uint8_t spi_putc(uint8_t data)
|
40 | {
|
41 | SPDR = data;
|
42 |
|
43 | while(!(SPSR & (1 << SPIF)));
|
44 | return SPDR;
|
45 | }
|
46 |
|
47 |
|
48 | void write_register(uint8_t address, uint8_t data)
|
49 | {
|
50 | set_cs(LOW);
|
51 | spi_putc(SPI_WRITE);
|
52 | spi_putc(address);
|
53 | spi_putc(data);
|
54 | set_cs(HIGH);
|
55 | }
|
56 |
|
57 | uint8_t read_register(uint8_t address)
|
58 | {
|
59 | set_cs(LOW);
|
60 | spi_putc(SPI_READ);
|
61 | spi_putc(address);
|
62 |
|
63 | uint8_t data = spi_putc(0xff);
|
64 | set_cs(HIGH);
|
65 | return data;
|
66 | }
|
67 |
|
68 | void modify_register(uint8_t address, uint8_t mask, uint8_t data)
|
69 | {
|
70 | set_cs(LOW);
|
71 | spi_putc(SPI_BIT_MODIFY);
|
72 | spi_putc(address);
|
73 | spi_putc(mask);
|
74 | spi_putc(data);
|
75 | set_cs(HIGH);
|
76 | }
|
77 |
|
78 |
|
79 | void set_bit(uint8_t address, uint8_t bit, uint8_t value)
|
80 | {
|
81 | modify_register(address,(1<<bit),value*255);
|
82 | }
|