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/mcp9808_i2c/mcp9808_i2c.c
+++ b/i2c/mcp9808_i2c/mcp9808_i2c.c
@@ -0,0 +1,147 @@
+/**
+ * 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 MCP9808 ±0.5°C Digital temperature Sensor
+   
+   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 MCP9808 board
+   GPIO PICO_DEFAULT_I2C_SCK_PIN (On Pico this is GP5 (physcial pin 7)) -> SCL on MCP9808 board
+   Vsys (physical pin 39) -> VDD on MCP9808 board
+   GND (physical pin 38)  -> GND on MCP9808 board
+
+*/
+//The bus address is determined by the state of pins A0, A1 and A2 on the MCP9808 board
+static uint8_t ADDRESS = 0x18;
+
+//hardware registers
+
+const uint8_t REG_POINTER = 0x00;
+const uint8_t REG_CONFIG = 0x01;
+const uint8_t REG_TEMP_UPPER = 0x02;
+const uint8_t REG_TEMP_LOWER = 0x03;
+const uint8_t REG_TEMP_CRIT = 0x04;
+const uint8_t REG_TEMP_AMB = 0x05;
+const uint8_t REG_RESOLUTION = 0x08;
+
+
+void mcp9808_check_limits(uint8_t upper_byte) {
+
+    // Check flags and raise alerts accordingly 
+    if ((upper_byte & 0x40) == 0x40) { //TA > TUPPER
+        printf("Temperature is above the upper temperature limit.\n");
+    }
+    if ((upper_byte & 0x20) == 0x20) { //TA < TLOWER
+        printf("Temperature is below the lower temperature limit.\n");
+    }
+    if ((upper_byte & 0x80) == 0x80) { //TA > TCRIT
+        printf("Temperature is above the critical temperature limit.\n");
+    }
+}
+
+float mcp9808_convert_temp(uint8_t upper_byte, uint8_t lower_byte) {
+
+    float temperature;
+
+
+    //Check if TA <= 0°C and convert to denary accordingly
+    if ((upper_byte & 0x10) == 0x10) {
+        upper_byte = upper_byte & 0x0F;
+        temperature = 256 - (((float) upper_byte * 16) + ((float) lower_byte / 16));
+    } else {
+        temperature = (((float) upper_byte * 16) + ((float) lower_byte / 16));
+
+    }
+    return temperature;
+}
+
+#ifdef i2c_default
+void mcp9808_set_limits() {
+
+    //Set an upper limit of 30°C for the temperature
+    uint8_t upper_temp_msb = 0x01;
+    uint8_t upper_temp_lsb = 0xE0;
+
+    //Set a lower limit of 20°C for the temperature
+    uint8_t lower_temp_msb = 0x01;
+    uint8_t lower_temp_lsb = 0x40;
+
+    //Set a critical limit of 40°C for the temperature
+    uint8_t crit_temp_msb = 0x02;
+    uint8_t crit_temp_lsb = 0x80;
+
+    uint8_t buf[3];
+    buf[0] = REG_TEMP_UPPER;
+    buf[1] = upper_temp_msb;
+    buf[2] = upper_temp_lsb;
+    i2c_write_blocking(i2c_default, ADDRESS, buf, 3, false);
+
+    buf[0] = REG_TEMP_LOWER;
+    buf[1] = lower_temp_msb;
+    buf[2] = lower_temp_lsb;
+    i2c_write_blocking(i2c_default, ADDRESS, buf, 3, false);
+
+    buf[0] = REG_TEMP_CRIT;
+    buf[1] = crit_temp_msb;
+    buf[2] = crit_temp_lsb;;
+    i2c_write_blocking(i2c_default, ADDRESS, buf, 3, 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/mcp9808_i2c example requires a board with I2C pins
+    puts("Default I2C pins were not defined");
+#else
+    printf("Hello, MCP9808! 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));
+
+    mcp9808_set_limits();
+
+    uint8_t buf[2];
+    uint16_t upper_byte;
+    uint16_t lower_byte;
+
+    float temperature;
+
+    while (1) {
+        // Start reading ambient temperature register for 2 bytes
+        i2c_write_blocking(i2c_default, ADDRESS, &REG_TEMP_AMB, 1, true);
+        i2c_read_blocking(i2c_default, ADDRESS, buf, 2, false);
+
+        upper_byte = buf[0];
+        lower_byte = buf[1];
+
+        //isolates limit flags in upper byte
+        mcp9808_check_limits(upper_byte & 0xE0);
+
+        //clears flag bits in upper byte
+        temperature = mcp9808_convert_temp(upper_byte & 0x1F, lower_byte);
+        printf("Ambient temperature: %.4f°C\n", temperature);
+
+        sleep_ms(1000);
+    }
+#endif
+}