Raspberry Pi Pico (#12)

* Adding a 90% completed, compilable but untested ADS

* Made basic changes to actuator & sensor. Also added motor class

* Removed unnecessary .cpp files

* Updated sensor & actuator classes, finished ads, added variable time step to kalman filter, set up all tests for future assertions

* Relocated 'main' to 'active-drag-system.cpp'. Added more info to README

* Removed main.cpp

* Added more details to README

* Changed some function parameters from pass-by-pointer to pass-by-reference. Also removed the std namespace

* Started writing the test cases

* Updated the .gitignore file

* Removed some files that should be gitignored

* Up to date with Jazz's pull request

* Test Launch Branch Created; PRU Servo Control with Test Program

* Added I2C device class and register IDs for MPL [INCOMPLETE SENSOR IMPLEMENTATION]

Needs actual data getting function implementation for both sensors and register IDs for BNO, will implement shortly.

* Partial implementation of MPL sensor

Added startup method, still needs fleshed out data getters and setters and finished I2C implementation. MOST LIKELY WILL HAVE COMPILATION ISSUES.

* *Hypothetically* complete MPL implementation

NEEDS HARDWARE TESTING

* IMU Header and init() method implementation

Needs like, all data handling still lol

* Hypothetically functional (Definitely won't compile)

* We ball?

* Conversion to Raspberry Pi Pico Build System; Removed Beaglebone
specific code; Simple blinking example in ADS source file; builds for
Pico W

* Rearranged build so dependent upon cmake file already existing in pico-sdk; current executable prints current altitude, velocity, and time taken to read and calculate said values; ~320 us to do so

* Altimeter interrupt callback for Pad to Boost State; dummy templates for other callbacks with comments describing potential implementation details

* Altimeter interrupts relatively finished; need to test with vacuum chamber to verify behavior

* Established interrupt pins as pullup and active-low; adjusted callback functions to properly use function pointers; still need to verify interrupt system with vacuum chamber

* Removed weird artifact in .gitignore, adjust CMakeLists to auto pull pico sdk, added Dockerfile

* added Docker dev container file

* modified CMakeLists to auto pull sdk if not already downloaded, add build.sh script, fixed Dockerfile

* added bno055 support

* changed bno055 lin accel struct to use float instead of double

* added bno055 support not tested, but compiles, fixed CMakLists to before I messed with it

* added absolute quaternion output from bno055

* Added Euler and aboslute linear accelration

* Flash implementation for data logging; each log entry is 32 bytes long

* added base pwm functions and started on apogee detection

* State machine verified functional with logging capabilities; currently on same core

* Ooops missed double define, renamed LOOP_HZ to LOOP_PERIOD; State machine functional after merge still

* Simple test program to see servo PWM range; logging with semaphores for safe multithreading

* Kalman filters generously provided from various sources for temporary replacement; minimum deployment 30 percent; state machine functionality restored; multithreading logging verified; altimeter broke and replaced

* Stop logging on END state; provide deployment function with AGL instead of ASL altitude

* Various minimal changes; Flash size from 1MB to 8MB; M1939 to M2500T burn time; pin assignments for new PCB; External Status LED to Internal Status LED

---------

Co-authored-by: Jazz Jackson <[email protected]>
Co-authored-by: Cian Capacci <[email protected]>
Co-authored-by: Gregory Wainer <[email protected]>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/altimeter.cpp b/src/altimeter.cpp
new file mode 100644
index 0000000..a5c8849
--- /dev/null
+++ b/src/altimeter.cpp
@@ -0,0 +1,50 @@
+#include <stdio.h>
+
+#include "hardware/gpio.h"
+#include "boards/pico_w.h"
+#include "hardware/i2c.h"
+#include "pico/stdio.h"
+#include "pico/time.h"
+
+#define ALT_ADDR 0x60
+#define MAX_SCL 400000
+#define DATA_RATE_HZ 15
+
+float altitude = 0.0f;
+float get_altitude();
+
+int main() {
+    stdio_init_all();
+
+    i2c_init(i2c_default, MAX_SCL);
+    gpio_set_function(PICO_DEFAULT_I2C_SDA_PIN, GPIO_FUNC_I2C);
+    gpio_set_function(PICO_DEFAULT_I2C_SCL_PIN, GPIO_FUNC_I2C);
+    gpio_pull_up(PICO_DEFAULT_I2C_SDA_PIN);
+    gpio_pull_up(PICO_DEFAULT_I2C_SCL_PIN);
+
+    uint8_t config[2] = {0};
+
+    // Select control register(0x26)
+    // Active mode, OSR = 16, altimeter mode(0xB8)
+    config[0] = 0x26;
+    config[1] = 0xB9;
+    i2c_write_blocking(i2c_default, ALT_ADDR, config, 2, true);
+    sleep_ms(1500);
+
+    while (1) {
+        sleep_ms(1000);
+        altitude = get_altitude();
+        printf("Altitude: %4.2f\n", altitude);
+    }
+}
+
+float get_altitude() {
+    uint8_t reg = 0x01;
+    uint8_t data[5];
+    i2c_write_blocking(i2c_default, ALT_ADDR, &reg, 1, true);
+    i2c_read_blocking(i2c_default, ALT_ADDR, data, 5, false);
+    // Exactly how MPL3115A2 datasheet says to retrieve altitude
+    float altitude = (float) ((int16_t) ((data[0] << 8) | data[1])) + (float) (data[2] >> 4) * 0.0625;
+    return altitude;
+}
+