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
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/**
* @file dac.cpp
* @brief Manages signal creation using the DAC.
*
* Copyright (C) 2020 Clyne Sullivan
*
* Distributed under the GNU GPL v3 or later. You should have received a copy of
* the GNU General Public License along with this program.
* If not, see <https://www.gnu.org/licenses/>.
*/
#include "dac.hpp"
constexpr static const auto dacd = &DACD1;
constexpr static const auto dacd2 = &DACD2;
constexpr static const auto gptd = &GPTD7;
constexpr static const DACConfig dac_config = {
.init = 0,
.datamode = DAC_DHRM_12BIT_RIGHT,
.cr = 0
};
constexpr static const DACConversionGroup dac_group_config = {
.num_channels = 1,
.end_cb = nullptr,
.error_cb = nullptr,
.trigger = DAC_TRG(2)
};
constexpr static const GPTConfig gpt_config = {
.frequency = 2400000,
.callback = nullptr,
.cr2 = TIM_CR2_MMS_1, /* TRGO */
.dier = 0
};
static unsigned int dacs_running = 0;
namespace dac
{
void init()
{
palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
dacStart(dacd, &dac_config);
dacStart(dacd2, &dac_config);
gptStart(gptd, &gpt_config);
}
void write_start(unsigned int channel, dacsample_t *buffer, size_t count)
{
if (channel < 2) {
dacStartConversion(channel == 0 ? dacd : dacd2, &dac_group_config, buffer, count);
if (dacs_running == 0)
gptStartContinuous(gptd, 25);
dacs_running |= 1 << channel;
}
}
void write_stop(unsigned int channel)
{
if (channel < 2) {
dacStopConversion(channel == 0 ? dacd : dacd2);
dacs_running &= ~(1 << channel);
if (dacs_running == 0)
gptStopTimer(gptd);
}
}
}
|
