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tests/driver_dac_dds: fix output of sine and saw functions

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This commit is contained in:
Benjamin Valentin 2023-02-06 14:15:45 +01:00
parent ebc869a83f
commit 65fccdd55a
1 changed files with 6 additions and 15 deletions
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21
tests/driver_dac_dds/main.c
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@ -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;
}
}
@ -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) {
@ -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;
}