blob: f20f73295c94d6995842fe945922d959b3e8743c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
#include <xc.h>
#include "spi.h"
void spi_init(void) {
SSPSTAT = 0x40;
SSPCON1 = 0x2a;
SSPADD = 39; // 200 kHz @ 32MHz
SPI_SDI = 0;
SPI_SCK = 0;
SPI_SDO = 0;
SPI_SDI_TRIS = 1;
SPI_SCK_TRIS = 0;
SPI_SDO_TRIS = 0;
SSPCLKPPS = SPI_SCK_PPS_IN;
SSPDATPPS = SPI_SDI_PPS;
SPI_SCK_PPS_OUT = 0x21;
SPI_SDO_PPS = 0x23;
}
uint8_t spi_exchange(uint8_t data) {
SSPCON1bits.WCOL = 0;
SSPBUF = data;
while (!SSPSTATbits.BF);
return SSPBUF;
}
uint8_t spi_exchange_buffer(uint8_t *in, uint8_t buflen, uint8_t *out) {
uint8_t written = 0;
if (buflen != 0) {
if (in != NULL) {
while (written < buflen) {
if (out == NULL)
spi_exchange(in[written]);
else
out[written] = spi_exchange(in[written]);
written++;
}
} else if (out != NULL)
while (written < buflen)
out[written++] = spi_exchange(DUMMY_DATA);
}
return written;
}
inline bool spi_is_buffer_full(void) {
return SSPSTATbits.BF;
}
inline bool spi_has_write_collision_occured(void) {
return SSPCON1bits.WCOL;
}
inline void spi_clear_write_collision_status(void) {
SSPCON1bits.WCOL = 0;
}
|
