blob: 8baa8e2d955814895005b9f74ad5824623eac7e6 (
plain)
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
|
#include "../spi_usi.h"
#include "../mcu/mcu_def.h"
#ifdef IOE_SPI_USI_MASTER
// TODO counter settings with interups
inline void ioe_spi_usi_init(void) {
// Set USCK and DO as output
DDR_USI |= _BV(DD_USCK) | _BV(DD_DO);
// Set DI pull up resistor
PORT_USI |= _BV(PORT_DI);
USICR |= _BV(USIWM0) | _BV(USICS1) | _BV(USICLK);
}
inline int8_t ioe_spi_usi_transfer(int8_t d) {
USISR |= _BV(USIOIF);
USIDR = d;
do {
USICR |= _BV(USITC);
} while (!(USISR & _BV(USIOIF)));
return USIDR;
}
#else /* IOE_SPI_USI_MASTER */
inline void ioe_spi_usi_init(void) {
// Set DO as output
DDR_USI |= _BV(DD_DO);
// Set USCK and DI pull up resistor
PORT_USI |= _BV(PORT_USCK) | _BV(PORT_DI);
USICR |= _BV(USIWM0) | _BV(USICS1) | _BV(USIOIE);
}
inline void ioe_spi_usi_expose(int8_t data) {
USIDR = data;
}
inline uint8_t ioe_spi_usi_busy(void) {
return USISR & 0x0F;
}
inline void ioe_spi_usi_join(void) {
while (ioe_spi_usi_busy()) {
}
}
SIGNAL(USI_OVF_vect) {
ioe_spi_usi_retrieve(USIDR);
USISR |= _BV(USIOIF);
}
#endif /* IOE_SPI_USI_MASTER */
|
