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tests/driver_dac_dds: fix output of sine and saw functions #19251

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merged 1 commit into from
Feb 7, 2023
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tests/driver_dac_dds: fix output of sine and saw functions #19251

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21 changes: 6 additions & 15 deletions tests/driver_dac_dds/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,24 +98,17 @@ typedef void (*sample_gen_t)(uint8_t *dst, size_t len, uint16_t period);

static void _fill_saw_samples_8(uint8_t *buf, size_t len, uint16_t period)
{
uint8_t x = 0;
unsigned step = 0xFF / period;

for (uint16_t i = 0; i < len; ++i) {
x += step;
buf[i] = x;
buf[i] = (i * 0xFFUL) / period;
}
}

static void _fill_saw_samples_16(uint8_t *buf, size_t len, uint16_t period)
{
uint16_t x = 0;
unsigned step = 0xFFFF / period;

for (uint16_t i = 0; i < len; ++i) {
x += step;
buf[i] = x;
buf[++i] = x >> 8;
uint16_t y = (i * 0xFFFFUL) / period;
buf[i] = y;
buf[++i] = y >> 8;
}
}

Expand All @@ -126,8 +119,7 @@ static void _fill_sine_samples_8(uint8_t *buf, size_t len, uint16_t period)

for (uint16_t i = 0; i < period; ++i) {
x += step;
buf[i] = isin(x) >> 5;
buf[i] += INT8_MAX + 1;
buf[i] = (isin(x) + 4096) >> 6;
}

for (uint16_t i = period; i < len; i += period) {
Expand All @@ -145,8 +137,7 @@ static void _fill_sine_samples_16(uint8_t *buf, size_t len, uint16_t period)
for (uint16_t i = 0; i < period; ++i) {
x += step;

uint16_t y = isin(x);
y += INT16_MAX + 1;
uint16_t y = (isin(x) + 4096) << 2;
buf[i] = y;
buf[++i] = y >> 8;
}
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