Updates along with SDK1.3.0 release (#181)

Bug fixes and new examples Co-authored-by: Paulo Marques <pm@quant-insight.com> Co-authored-by: martin <admin@crossleys.biz> Co-authored-by: matiasilva <matias.silva@raspberrypi.com> Co-authored-by: Uri Shaked <uri@urishaked.com> Co-authored-by: Diego Solano <diegosolano@gmail.com> Co-authored-by: Andrew Scheller <andrew.scheller@raspberrypi.com> Co-authored-by: Adrian Hesketh <a-h@users.noreply.github.com> Co-authored-by: Emircan Gündoğdu <58917386+emircangun@users.noreply.github.com> Co-authored-by: Josef Wegner <80200012+josefwegner@users.noreply.github.com> Co-authored-by: pmarques-dev <72901351+pmarques-dev@users.noreply.github.com> Co-authored-by: Paulo Marques <pm@quant-insight.com> Co-authored-by: mjcross <mjcross@users.noreply.github.com> Co-authored-by: martin <admin@crossleys.biz>
2021-11-01 14:41:54 -05:00
parent 146680d625
commit f800a7e303
150 changed files with 4832 additions and 98 deletions
--- a/i2c/mma8451_i2c/mma8451_i2c.c
+++ b/i2c/mma8451_i2c/mma8451_i2c.c
@@ -0,0 +1,128 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "pico/stdlib.h"
+#include "pico/binary_info.h"
+#include "hardware/i2c.h"
+
+/* Example code to talk to a MMA8451 triple-axis accelerometer.
+   
+   This reads and writes to registers on the board. 
+
+   Connections on Raspberry Pi Pico board, other boards may vary.
+
+   GPIO PICO_DEFAULT_I2C_SDA_PIN (On Pico this is GP4 (physical pin 6)) -> SDA on MMA8451 board
+   GPIO PICO_DEFAULT_I2C_SCK_PIN (On Pico this is GP5 (physcial pin 7)) -> SCL on MMA8451 board
+   VSYS (physical pin 39) -> VDD on MMA8451 board
+   GND (physical pin 38)  -> GND on MMA8451 board
+
+*/
+
+const uint8_t ADDRESS = 0x1D;
+
+//hardware registers
+
+const uint8_t REG_X_MSB = 0x01;
+const uint8_t REG_X_LSB = 0x02;
+const uint8_t REG_Y_MSB = 0x03;
+const uint8_t REG_Y_LSB = 0x04;
+const uint8_t REG_Z_MSB = 0x05;
+const uint8_t REG_Z_LSB = 0x06;
+const uint8_t REG_DATA_CFG = 0x0E;
+const uint8_t REG_CTRL_REG1 = 0x2A;
+
+// Set the range and precision for the data 
+const uint8_t range_config = 0x01; // 0x00 for ±2g, 0x01 for ±4g, 0x02 for ±8g
+const float count = 2048; // 4096 for ±2g, 2048 for ±4g, 1024 for ±8g
+
+uint8_t buf[2];
+
+float mma8451_convert_accel(uint16_t raw_accel) {
+    float acceleration;
+    // Acceleration is read as a multiple of g (gravitational acceleration on the Earth's surface)
+    // Check if acceleration < 0 and convert to decimal accordingly
+    if ((raw_accel & 0x2000) == 0x2000) {
+        raw_accel &= 0x1FFF;
+        acceleration = (-8192 + (float) raw_accel) / count;
+    } else {
+        acceleration = (float) raw_accel / count;
+    }
+    acceleration *= 9.81f;
+    return acceleration;
+}
+
+#ifdef i2c_default
+void mma8451_set_state(uint8_t state) {
+    buf[0] = REG_CTRL_REG1;
+    buf[1] = state; // Set RST bit to 1
+    i2c_write_blocking(i2c_default, ADDRESS, buf, 2, false);
+}
+#endif
+
+int main() {
+    stdio_init_all();
+
+#if !defined(i2c_default) || !defined(PICO_DEFAULT_I2C_SDA_PIN) || !defined(PICO_DEFAULT_I2C_SCL_PIN)
+#warning i2c/mma8451_i2c example requires a board with I2C pins
+    puts("Default I2C pins were not defined");
+#else
+    printf("Hello, MMA8451! Reading raw data from registers...\n");
+
+    // This example will use I2C0 on the default SDA and SCL pins (4, 5 on a Pico)
+    i2c_init(i2c_default, 400 * 1000);
+    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);
+    // Make the I2C pins available to picotool
+    bi_decl(bi_2pins_with_func(PICO_DEFAULT_I2C_SDA_PIN, PICO_DEFAULT_I2C_SCL_PIN, GPIO_FUNC_I2C));
+
+    float x_acceleration;
+    float y_acceleration;
+    float z_acceleration;
+
+    // Enable standby mode
+    mma8451_set_state(0x00);
+
+    // Edit configuration while in standby mode
+    buf[0] = REG_DATA_CFG;
+    buf[1] = range_config;
+    i2c_write_blocking(i2c_default, ADDRESS, buf, 2, false);
+
+    // Enable active mode
+    mma8451_set_state(0x01);
+
+    while (1) {
+
+        // Start reading acceleration registers for 2 bytes
+        i2c_write_blocking(i2c_default, ADDRESS, &REG_X_MSB, 1, true);
+        i2c_read_blocking(i2c_default, ADDRESS, buf, 2, false);
+        x_acceleration = mma8451_convert_accel(buf[0] << 6 | buf[1] >> 2);
+
+        i2c_write_blocking(i2c_default, ADDRESS, &REG_Y_MSB, 1, true);
+        i2c_read_blocking(i2c_default, ADDRESS, buf, 2, false);
+        y_acceleration = mma8451_convert_accel(buf[0] << 6 | buf[1] >> 2);
+
+        i2c_write_blocking(i2c_default, ADDRESS, &REG_Z_MSB, 1, true);
+        i2c_read_blocking(i2c_default, ADDRESS, buf, 2, false);
+        z_acceleration = mma8451_convert_accel(buf[0] << 6 | buf[1] >> 2);
+
+        // Display acceleration values 
+        printf("ACCELERATION VALUES: \n");
+        printf("X acceleration: %.6fms^-2\n", x_acceleration);
+        printf("Y acceleration: %.6fms^-2\n", y_acceleration);
+        printf("Z acceleration: %.6fms^-2\n", z_acceleration);
+
+        sleep_ms(500);
+
+        // Clear terminal 
+        printf("\e[1;1H\e[2J");
+    }
+
+#endif
+}