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