104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
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/*
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* Author: Brendan Le Foll
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* Copyright (c) 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <unistd.h>
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#include "mraa.h"
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#include "mraa/firmata.h"
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#define FIRMATA_START_SYSEX 0xF0
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#define FIRMATA_END_SYSEX 0xF7
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#define FIRMATA_I2C_REPLY 0x77
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#define FIRMATA_I2C_REQUEST 0x76
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#define I2C_MODE_READ 0x01
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void
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interrupt(uint8_t* buf, int length)
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{
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printf("reg read returned: %d, with buffer size %d\n", ((buf[6] & 0x7f) | ((buf[7] & 0x7f) << 7)), length);
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}
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int
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main()
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{
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mraa_init();
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//! [Interesting]
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/**
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* This example reads from a firmata device the check buffer on a BMP085 on
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* 0xD0 which should return 0x55. Obviously I2C_REPLY has to be disabled in
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* firmata_pull for this to work breaking all i2c support for firmata
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*/
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mraa_add_subplatform(MRAA_GENERIC_FIRMATA, "/dev/ttyACM0");
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mraa_firmata_context firm = mraa_firmata_init(FIRMATA_I2C_REPLY);
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if (firm == NULL) {
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return EXIT_FAILURE;
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}
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mraa_firmata_response(firm, interrupt);
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uint8_t* buffer = calloc(9, 0);
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if (buffer == NULL) {
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free(firm);
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return EXIT_FAILURE;
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}
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buffer[0] = FIRMATA_START_SYSEX;
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buffer[1] = FIRMATA_I2C_REQUEST;
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buffer[2] = 0x77;
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buffer[3] = I2C_MODE_READ << 3;
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// register to read from
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buffer[4] = 0xD0 & 0x7f;
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buffer[5] = (0xD0 >> 7) & 0x7f;
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// number of bytes
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buffer[6] = 1 & 0x7f;
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buffer[7] = (1 >> 7) & 0x7f;
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buffer[8] = FIRMATA_END_SYSEX;
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mraa_firmata_write_sysex(firm, buffer, 9);
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sleep(1);
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// stop the isr and set it again
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mraa_firmata_response_stop(firm);
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mraa_firmata_response(firm, interrupt);
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mraa_firmata_write_sysex(firm, buffer, 9);
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sleep(1);
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// close everything and try again
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mraa_firmata_close(firm);
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firm = mraa_firmata_init(FIRMATA_I2C_REPLY);
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mraa_firmata_response(firm, interrupt);
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mraa_firmata_write_sysex(firm, buffer, 9);
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sleep(10);
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mraa_firmata_close(firm);
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//! [Interesting]
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return EXIT_SUCCESS;
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}
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