170bdd104f
Large change that removes the duplicated MIT notice withe a spdx tag Signed-off-by: Thomas Ingleby <thomas.ingleby@intel.com>
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
|
|
* Author: Jon Trulson <jtrulson@ics.com>
|
|
* Copyright (c) 2016 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*
|
|
* Example usage: Search and print the found OW device ID recursively.
|
|
*
|
|
*/
|
|
|
|
/* standard headers */
|
|
#include "stdio.h"
|
|
|
|
/* mraa header */
|
|
#include "mraa.h"
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
mraa_uart_ow_context uart_ow;
|
|
mraa_result_t status;
|
|
uint8_t id[MRAA_UART_OW_ROMCODE_SIZE];
|
|
uint8_t count = 0;
|
|
|
|
//! [Interesting]
|
|
uart_ow = mraa_uart_ow_init(0);
|
|
if (uart_ow == NULL) {
|
|
fprintf(stderr, "Failed to initialize UART OW\n");
|
|
mraa_deinit();
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
// Reset the ow bus and see if anything is present
|
|
status = mraa_uart_ow_reset(uart_ow);
|
|
if (status == MRAA_SUCCESS) {
|
|
fprintf(stdout, "Reset succeeded, device(s) detected!\n");
|
|
} else {
|
|
goto err_exit;
|
|
}
|
|
|
|
fprintf(stdout, "Looking for devices...\n");
|
|
|
|
/*
|
|
* we are essentially doing a binary tree search through the 64
|
|
* bit address space. id is modified during this search, and will
|
|
* be set to the valid rom code for each device found.
|
|
*
|
|
* start the search from scratch
|
|
*/
|
|
status = mraa_uart_ow_rom_search(uart_ow, 1, id);
|
|
if (status != MRAA_SUCCESS) {
|
|
goto err_exit;
|
|
}
|
|
|
|
while (status == MRAA_SUCCESS) {
|
|
/* The first byte (id[0]]) is the device type (family) code.
|
|
* The last byte (id[7]) is the rom code CRC value. The
|
|
* intervening bytes (id[1]-id[6]) are the unique 48 bit
|
|
* device ID.
|
|
*/
|
|
fprintf(stdout, "Device %02d Type 0x%02x ID %02x%02x%02x%02x%02x%02x CRC 0x%02x\n", count,
|
|
id[0], id[6], id[5], id[4], id[3], id[2], id[1], id[7]);
|
|
count++;
|
|
|
|
// continue the search with start argument set to 0
|
|
status = mraa_uart_ow_rom_search(uart_ow, 0, id);
|
|
}
|
|
|
|
/* stop uart_ow */
|
|
mraa_uart_ow_stop(uart_ow);
|
|
|
|
//! [Interesting]
|
|
/* deinitialize mraa for the platform (not needed most of the time) */
|
|
mraa_deinit();
|
|
|
|
return EXIT_SUCCESS;
|
|
|
|
err_exit:
|
|
mraa_result_print(status);
|
|
|
|
/* stop uart_ow */
|
|
mraa_uart_ow_stop(uart_ow);
|
|
|
|
/* deinitialize mraa for the platform (not needed most of the times) */
|
|
mraa_deinit();
|
|
|
|
return EXIT_FAILURE;
|
|
}
|