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adc/temp integer

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William Clark 2024-01-04 19:54:13 +00:00
parent 3b3b00a9f8
commit bd76380a65
3 changed files with 16 additions and 20 deletions
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25
lis3dh.c
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@ -373,27 +373,19 @@ int lis3dh_reset(lis3dh_t *lis3dh) {
} }
/* read all 3 ADCs and convert readings depending on power mode /* read all 3 ADCs and convert readings depending on power mode
st 1 float count is equal to 1 millivolt */ st 1 lsb is equal to 1 millivolt */
int lis3dh_read_adc(lis3dh_t *lis3dh) { int lis3dh_read_adc(lis3dh_t *lis3dh) {
uint8_t data[6]; uint8_t data[6];
int err = 0;
uint8_t shift; uint8_t shift;
float divisor; int err = 0;
/* read adc{1,2,3} LSB and MSB */
err |= lis3dh->dev.read(REG_OUT_ADC1_L, data, 6); err |= lis3dh->dev.read(REG_OUT_ADC1_L, data, 6);
if (lis3dh->cfg.mode == LIS3DH_MODE_LP) { shift = (lis3dh->cfg.mode == LIS3DH_MODE_LP) ? 8 : 6;
shift = 8;
divisor = 256.0;
} else {
shift = 6;
divisor = 1024.0;
}
lis3dh->adc.adc1 = 1200.0 + (400.0 * (float)(((int16_t)(data[1] | (data[0] << 8))) >> shift) / divisor); lis3dh->adc.adc1 = 1200 + (400 * ((data[1] | data[0] << 8) >> shift) >> (16 - shift));
lis3dh->adc.adc2 = 1200.0 + (400.0 * (float)(((int16_t)(data[3] | (data[2] << 8))) >> shift) / divisor); lis3dh->adc.adc2 = 1200 + (400 * ((data[3] | data[2] << 8) >> shift) >> (16 - shift));
lis3dh->adc.adc3 = 1200.0 + (400.0 * (float)(((int16_t)(data[5] | (data[4] << 8))) >> shift) / divisor); lis3dh->adc.adc3 = 1200 + (400 * ((data[5] | data[4] << 8) >> shift) >> (16 - shift));
return err; return err;
} }
@ -403,12 +395,13 @@ int lis3dh_read_adc(lis3dh_t *lis3dh) {
in increments of plus or negative 1 unit celsius. in increments of plus or negative 1 unit celsius.
the reported temperature is stored inplace of adc3 the reported temperature is stored inplace of adc3
temp sensing is always in 8-bit mode temp sensing is always in 8-bit mode
operating range: -40 to 85 celsius */ operating range: -40 to 85 celsius
1 lsb = 1 deg C */
int lis3dh_read_temp(lis3dh_t *lis3dh) { int lis3dh_read_temp(lis3dh_t *lis3dh) {
uint8_t data; uint8_t data;
int err = 0; int err = 0;
err |= lis3dh->dev.read(REG_OUT_ADC3_H, &data, 1); err |= lis3dh->dev.read(REG_OUT_ADC3_H, &data, 1);
lis3dh->adc.adc3 = (float)((int8_t)data) + 25.0; lis3dh->adc.adc3 = (int8_t)data + 25;
return err; return err;
} }

9
lis3dh.h
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@ -235,11 +235,14 @@ struct lis3dh_config {
* same as ODR * same as ODR
* Output: * Output:
* actual value in mV * actual value in mV
* 1 lsb = 1 mv
* Temperature:
* 1 lsb = 1 deg C
*/ */
struct lis3dh_adc { struct lis3dh_adc {
float adc1; int16_t adc1;
float adc2; int16_t adc2;
float adc3; int16_t adc3;
}; };
/* accel data not read from FIFO is put here */ /* accel data not read from FIFO is put here */

2
main.c
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@ -91,7 +91,7 @@ int main() {
quit("temp()", &lis); quit("temp()", &lis);
} }
printf("ADC1: %04.04f mV, temp: %.0f\n", lis.adc.adc1, lis.adc.adc3); printf("ADC1: %d mV, temp: %d\n", lis.adc.adc1, lis.adc.adc3);
/* unregister interrupt */ /* unregister interrupt */
if (int_unregister(GPIO_INTERRUPT_PIN)) { if (int_unregister(GPIO_INTERRUPT_PIN)) {