-
Notifications
You must be signed in to change notification settings - Fork 4
/
usepin.go
47 lines (41 loc) · 1.1 KB
/
usepin.go
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
// Copyright 2019 Michal Derkacz. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package spi
import "github.com/embeddedgo/stm32/hal/gpio"
type Signal uint8
const (
SCK Signal = iota
MOSI
MISO
NSS
)
// UsePinMaster is a helper function that can be used to configure GPIO pins as
// required by SPI master device. Only certain pins can be used (see datasheet).
func (d *Driver) UsePinMaster(pin gpio.Pin, sig Signal) {
var cfg gpio.Config
if sig == MISO {
cfg.Mode = gpio.AltIn
} else {
if sig == NSS {
cfg.Pull = gpio.PullUp
}
cfg.Mode = gpio.Alt
cfg.Speed = gpio.VeryHigh
}
pin.Setup(&cfg)
pin.SetAltFunc(altFunc(d.p, pin))
}
// UsePinSlave is a helper function that can be used to configure GPIO pins as
// required by SPI slave device. Only certain pins can be used (see datasheet).
func (d *Driver) UsePinSlave(pin gpio.Pin, sig Signal) {
var cfg gpio.Config
if sig == MISO {
cfg.Mode = gpio.Alt
cfg.Speed = gpio.VeryHigh
} else {
cfg.Mode = gpio.AltIn
}
pin.Setup(&cfg)
pin.SetAltFunc(altFunc(d.p, pin))
}