--- /dev/null
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_DATA_H_
+#define _AO_DATA_H_
+
+#define GRAVITY 9.80665
+
+#if HAS_ADC
+#define AO_DATA_ADC (1 << 0)
+#else
+#define AO_DATA_ADC 0
+#endif
+
+#if HAS_MS5607
+#include <ao_ms5607.h>
+#define AO_DATA_MS5607 (1 << 1)
+#else
+#define AO_DATA_MS5607 0
+#endif
+
+#if HAS_MPU6000
+#include <ao_mpu6000.h>
+#define AO_DATA_MPU6000 (1 << 2)
+#else
+#define AO_DATA_MPU6000 0
+#endif
+
+#if HAS_HMC5883
+#include <ao_hmc5883.h>
+#define AO_DATA_HMC5883 (1 << 3)
+#else
+#define AO_DATA_HMC5883 0
+#endif
+
+#if HAS_MMA655X
+#include <ao_mma655x.h>
+#define AO_DATA_MMA655X (1 << 4)
+#else
+#define AO_DATA_MMA655X 0
+#endif
+
+#ifdef AO_DATA_RING
+
+#define AO_DATA_ALL (AO_DATA_ADC|AO_DATA_MS5607|AO_DATA_MPU6000|AO_DATA_HMC5883|AO_DATA_MMA655X)
+
+struct ao_data {
+ uint16_t tick;
+#if HAS_ADC
+ struct ao_adc adc;
+#endif
+#if HAS_MS5607
+ struct ao_ms5607_sample ms5607_raw;
+ struct ao_ms5607_value ms5607_cooked;
+#endif
+#if HAS_MPU6000
+ struct ao_mpu6000_sample mpu6000;
+#if !HAS_MMA655X
+ int16_t z_accel;
+#endif
+#endif
+#if HAS_HMC5883
+ struct ao_hmc5883_sample hmc5883;
+#endif
+#if HAS_MMA655X
+ uint16_t mma655x;
+#endif
+};
+
+#define ao_data_ring_next(n) (((n) + 1) & (AO_DATA_RING - 1))
+#define ao_data_ring_prev(n) (((n) - 1) & (AO_DATA_RING - 1))
+
+/* Get a copy of the last complete sample set */
+void
+ao_data_get(__xdata struct ao_data *packet);
+
+extern volatile __xdata struct ao_data ao_data_ring[AO_DATA_RING];
+extern volatile __data uint8_t ao_data_head;
+extern volatile __data uint8_t ao_data_present;
+extern volatile __data uint8_t ao_data_count;
+
+/*
+ * Mark a section of data as ready, check for data complete
+ */
+#define AO_DATA_PRESENT(bit) (ao_data_present |= (bit))
+
+/*
+ * Wait until it is time to write a sensor sample; this is
+ * signaled by the timer tick
+ */
+#define AO_DATA_WAIT() do { \
+ ao_sleep(DATA_TO_XDATA ((void *) &ao_data_count)); \
+ } while (0)
+
+#endif /* AO_DATA_RING */
+
+#if !HAS_BARO && HAS_MS5607
+
+/* Either an MS5607 or an MS5611 hooked to a SPI port
+ */
+
+#define HAS_BARO 1
+
+typedef int32_t pres_t;
+
+#ifndef AO_ALT_TYPE
+#define AO_ALT_TYPE int32_t
+#endif
+
+typedef AO_ALT_TYPE alt_t;
+
+#define ao_data_pres_cook(packet) ao_ms5607_convert(&packet->ms5607_raw, &packet->ms5607_cooked)
+
+#define ao_data_pres(packet) ((packet)->ms5607_cooked.pres)
+#define ao_data_temp(packet) ((packet)->ms5607_cooked.temp)
+
+#define pres_to_altitude(p) ao_pa_to_altitude(p)
+
+#endif
+
+#if !HAS_BARO && HAS_ADC
+
+#define HAS_BARO 1
+
+typedef int16_t pres_t;
+typedef int16_t alt_t;
+
+#define ao_data_pres(packet) ((packet)->adc.pres)
+#define ao_data_temp(packet) ((packet)->adc.temp)
+#define pres_to_altitude(p) ao_pres_to_altitude(p)
+#define ao_data_pres_cook(p)
+
+#endif
+
+#if !HAS_BARO
+typedef int16_t alt_t;
+#endif
+
+/*
+ * Need a few macros to pull data from the sensors:
+ *
+ * ao_data_accel_sample - pull raw sensor and convert to normalized values
+ * ao_data_accel - pull normalized value (lives in the same memory)
+ * ao_data_set_accel - store normalized value back in the sensor location
+ * ao_data_accel_invert - flip rocket ends for positive acceleration
+ */
+
+#if HAS_ACCEL
+
+/* This section is for an analog accelerometer hooked to one of the ADC pins. As
+ * those are 5V parts, this also requires that the 5V supply be hooked to to anothe ADC
+ * pin so that the both can be measured to correct for changes between the 3.3V and 5V rails
+ */
+
+typedef int16_t accel_t;
+#define ao_data_accel(packet) ((packet)->adc.accel)
+#define ao_data_set_accel(packet, a) ((packet)->adc.accel = (a))
+#define ao_data_accel_invert(a) (0x7fff -(a))
+
+/*
+ * Ok, the math here is a bit tricky.
+ *
+ * ao_sample_accel: ADC output for acceleration
+ * ao_accel_ref: ADC output for the 5V reference.
+ * ao_cook_accel: Corrected acceleration value
+ * Vcc: 3.3V supply to the CC1111
+ * Vac: 5V supply to the accelerometer
+ * accel: input voltage to accelerometer ADC pin
+ * ref: input voltage to 5V reference ADC pin
+ *
+ *
+ * Measured acceleration is ratiometric to Vcc:
+ *
+ * ao_sample_accel accel
+ * ------------ = -----
+ * 32767 Vcc
+ *
+ * Measured 5v reference is also ratiometric to Vcc:
+ *
+ * ao_accel_ref ref
+ * ------------ = -----
+ * 32767 Vcc
+ *
+ *
+ * ao_accel_ref = 32767 * (ref / Vcc)
+ *
+ * Acceleration is measured ratiometric to the 5V supply,
+ * so what we want is:
+ *
+ * ao_cook_accel accel
+ * ------------- = -----
+ * 32767 ref
+ *
+ *
+ * accel Vcc
+ * = ----- * ---
+ * Vcc ref
+ *
+ * ao_sample_accel 32767
+ * = ------------ * ------------
+ * 32767 ao_accel_ref
+ *
+ * Multiply through by 32767:
+ *
+ * ao_sample_accel * 32767
+ * ao_cook_accel = --------------------
+ * ao_accel_ref
+ *
+ * Now, the tricky part. Getting this to compile efficiently
+ * and keeping all of the values in-range.
+ *
+ * First off, we need to use a shift of 16 instead of * 32767 as SDCC
+ * does the obvious optimizations for byte-granularity shifts:
+ *
+ * ao_cook_accel = (ao_sample_accel << 16) / ao_accel_ref
+ *
+ * Next, lets check our input ranges:
+ *
+ * 0 <= ao_sample_accel <= 0x7fff (singled ended ADC conversion)
+ * 0x7000 <= ao_accel_ref <= 0x7fff (the 5V ref value is close to 0x7fff)
+ *
+ * Plugging in our input ranges, we get an output range of 0 - 0x12490,
+ * which is 17 bits. That won't work. If we take the accel ref and shift
+ * by a bit, we'll change its range:
+ *
+ * 0xe000 <= ao_accel_ref<<1 <= 0xfffe
+ *
+ * ao_cook_accel = (ao_sample_accel << 16) / (ao_accel_ref << 1)
+ *
+ * Now the output range is 0 - 0x9248, which nicely fits in 16 bits. It
+ * is, however, one bit too large for our signed computations. So, we
+ * take the result and shift that by a bit:
+ *
+ * ao_cook_accel = ((ao_sample_accel << 16) / (ao_accel_ref << 1)) >> 1
+ *
+ * This finally creates an output range of 0 - 0x4924. As the ADC only
+ * provides 11 bits of data, we haven't actually lost any precision,
+ * just dropped a bit of noise off the low end.
+ */
+
+#if HAS_ACCEL_REF
+
+#define ao_data_accel_cook(packet) \
+ ((uint16_t) ((((uint32_t) (packet)->adc.accel << 16) / ((packet)->adc.accel_ref << 1))) >> 1)
+
+#else
+
+#define ao_data_accel_cook(packet) ((packet)->adc.accel)
+
+#endif /* HAS_ACCEL_REF */
+
+#endif /* HAS_ACCEL */
+
+#if !HAS_ACCEL && HAS_MMA655X
+
+#define HAS_ACCEL 1
+
+typedef int16_t accel_t;
+
+/* MMA655X is hooked up so that positive values represent negative acceleration */
+
+#define AO_ACCEL_INVERT 4095
+
+#define ao_data_accel(packet) ((packet)->mma655x)
+#if AO_MMA655X_INVERT
+#define ao_data_accel_cook(packet) (AO_ACCEL_INVERT - (packet)->mma655x)
+#else
+#define ao_data_accel_cook(packet) ((packet)->mma655x)
+#endif
+#define ao_data_set_accel(packet, accel) ((packet)->mma655x = (accel))
+#define ao_data_accel_invert(accel) (AO_ACCEL_INVERT - (accel))
+
+#endif
+
+#if !HAS_ACCEL && HAS_MPU6000
+
+#define HAS_ACCEL 1
+
+#define AO_ACCEL_INVERT 0
+
+typedef int16_t accel_t;
+
+/* MPU6000 is hooked up so that positive y is positive acceleration */
+#define ao_data_accel(packet) ((packet)->z_accel)
+#define ao_data_accel_cook(packet) (-(packet)->mpu6000.accel_y)
+#define ao_data_set_accel(packet, accel) ((packet)->z_accel = (accel))
+#define ao_data_accel_invert(a) (-(a))
+
+#endif
+
+#if !HAS_GYRO && HAS_MPU6000
+
+#define HAS_GYRO 1
+
+typedef int16_t gyro_t; /* in raw sample units */
+typedef int16_t angle_t; /* in degrees */
+
+/* Y axis is aligned with the direction of motion (along) */
+/* X axis is aligned in the other board axis (across) */
+/* Z axis is aligned perpendicular to the board (through) */
+
+#define ao_data_along(packet) ((packet)->mpu6000.accel_y)
+#define ao_data_across(packet) ((packet)->mpu6000.accel_x)
+#define ao_data_through(packet) ((packet)->mpu6000.accel_z)
+
+#define ao_data_roll(packet) ((packet)->mpu6000.gyro_y)
+#define ao_data_pitch(packet) ((packet)->mpu6000.gyro_x)
+#define ao_data_yaw(packet) ((packet)->mpu6000.gyro_z)
+
+#endif
+
+#if !HAS_MAG && HAS_HMC5883
+
+#define HAS_MAG 1
+
+typedef int16_t ao_mag_t; /* in raw sample units */
+
+#define ao_data_mag_along(packet) ((packet)->hmc5883.x)
+#define ao_data_mag_across(packet) ((packet)->hmc5883.y)
+#define ao_data_mag_through(packet) ((packet)->hmc5883.z)
+
+#endif
+
+#endif /* _AO_DATA_H_ */
projects / fw / altos / blobdiff