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show noise levels in ADC test

This commit is contained in:
Andrew Tridgell 2011-09-15 23:06:21 +10:00
parent 2ae78e197e
commit 4a7c9c406f
1 changed files with 35 additions and 24 deletions
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59
libraries/AP_ADC/examples/AP_ADC_test/AP_ADC_test.pde
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@ -20,33 +20,44 @@ void setup()
adc.Init(); // APM ADC initialization
delay(1000);
timer = millis();
}
}
static const uint8_t channel_map[6] = { 1, 2, 0, 4, 5, 6};
static uint16_t sin_count;
float v;
uint32_t last_usec = 0;
void loop()
{
v = sin(millis());
sin_count++;
void loop()
{
uint16_t result[6];
uint32_t deltat = 0;
uint16_t ch3;
uint16_t min[6], max[6];
uint8_t i;
if ((millis() - timer) > 200) {
uint16_t result[6];
uint32_t deltat;
uint16_t ch3;
timer = millis();
ch3 = adc.Ch(3);
deltat = adc.Ch6(channel_map, result);
Serial.printf("gx=%u gy=%u gz=%u ax=%u ay=%u az=%u gt=%u deltat=%lu sin_count=%u\n",
result[0], result[1], result[2],
result[3], result[4], result[5],
ch3, deltat, sin_count);
sin_count = 0;
for (i=0;i<6;i++) {
min[i] = 0xFFFF;
max[i] = 0;
}
}
do {
ch3 = adc.Ch(3);
deltat += adc.Ch6(channel_map, result);
for (i=0;i<6;i++) {
if (result[i] < min[i]) min[i] = result[i];
if (result[i] > max[i]) max[i] = result[i];
if (result[i] & 0x8000) {
Serial.printf("result[%u]=0x%04x\n", (unsigned)i, result[i]);
}
}
} while ((millis() - timer) < 200);
timer = millis();
Serial.printf("g=(%u,%u,%u) a=(%u,%u,%u) +/-(%u,%u,%u,%u,%u,%u) gt=%u dt=%u\n",
result[0], result[1], result[2],
result[3], result[4], result[5],
(max[0]-min[0]), (max[1]-min[1]), (max[2]-min[2]),
(max[3]-min[3]), (max[4]-min[4]), (max[5]-min[5]),
ch3, (unsigned)(deltat/1000));
}