actualizacion

PICO/I2C_SCANER/I2C_SCANER.c

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+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/i2c.h"
+
+// I2C defines
+// This example will use I2C0 on GPIO8 (SDA) and GPIO9 (SCL) running at 400KHz.
+// Pins can be changed, see the GPIO function select table in the datasheet for information on GPIO assignments
+#define I2C_PORT i2c0
+#define I2C_SDA 0
+#define I2C_SCL 1
+
+// I2C reserves some addresses for special purposes. We exclude these from the scan.
+// These are any addresses of the form 000 0xxx or 111 1xxx
+bool reserved_addr(uint8_t addr)
+{
+    return (addr & 0x78) == 0 || (addr & 0x78) == 0x78;
+}
+
+int main()
+{
+    stdio_init_all();
+
+    // I2C Initialisation. Using it at 400Khz.
+    i2c_init(I2C_PORT, 400 * 1000);
+
+    gpio_set_function(I2C_SDA, GPIO_FUNC_I2C);
+    gpio_set_function(I2C_SCL, GPIO_FUNC_I2C);
+    gpio_pull_up(I2C_SDA);
+    gpio_pull_up(I2C_SCL);
+
+    int error, address;
+    uint8_t data;
+    int nDevices;
+
+    sleep_ms(5000);
+
+    while (1)
+    {
+
+        printf("Escaneando bus I2C\n");
+        printf("===================\n");
+
+        nDevices = 0;
+
+        for (address = 1; address < 127; address++)
+        {
+
+            if (reserved_addr(address))
+                error = PICO_ERROR_GENERIC;
+            else
+                error = i2c_read_blocking(I2C_PORT, address, &data, 1, false);
+
+            if (error >= 0)
+            {
+                printf("Dispositivo I2C encontrado en 0x%02x \n", address);
+                nDevices = nDevices + 1;
+            }
+        }
+        printf("Encontrados %2x dispositivos I2C\n", nDevices);
+        printf("===================\n");
+        printf("\n");
+        printf("\n");
+        printf("\n");
+        printf("\n");
+
+        sleep_ms(5000);
+    }
+
+    return 0;
+}