76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
// Commands for sending messages on an I2C bus
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//
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// Copyright (C) 2018 Florian Heilmann <Florian.Heilmann@gmx.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include <string.h> // memcpy
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#include "basecmd.h" //oid_alloc
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#include "command.h" //sendf
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#include "sched.h" //DECL_COMMAND
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#include "board/gpio.h" //i2c_write/read/setup
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struct i2cdev_s {
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struct i2c_config i2c_config;
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};
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void
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command_config_i2c(uint32_t *args)
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{
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uint8_t addr = args[3] & 0x7f;
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struct i2cdev_s *i2c = oid_alloc(args[0], command_config_i2c
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, sizeof(*i2c));
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i2c->i2c_config = i2c_setup(args[1], args[2], addr);
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}
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DECL_COMMAND(command_config_i2c,
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"config_i2c oid=%c i2c_bus=%u rate=%u address=%u");
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void
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command_i2c_write(uint32_t *args)
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{
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uint8_t oid = args[0];
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struct i2cdev_s *i2c = oid_lookup(oid, command_config_i2c);
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uint8_t data_len = args[1];
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uint8_t *data = command_decode_ptr(args[2]);
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i2c_write(i2c->i2c_config, data_len, data);
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}
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DECL_COMMAND(command_i2c_write, "i2c_write oid=%c data=%*s");
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void
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command_i2c_read(uint32_t * args)
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{
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uint8_t oid = args[0];
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struct i2cdev_s *i2c = oid_lookup(oid, command_config_i2c);
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uint8_t reg_len = args[1];
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uint8_t *reg = command_decode_ptr(args[2]);
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uint8_t data_len = args[3];
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uint8_t data[data_len];
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i2c_read(i2c->i2c_config, reg_len, reg, data_len, data);
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sendf("i2c_read_response oid=%c response=%*s", oid, data_len, data);
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}
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DECL_COMMAND(command_i2c_read, "i2c_read oid=%c reg=%*s read_len=%u");
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void
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command_i2c_modify_bits(uint32_t *args)
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{
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uint8_t oid = args[0];
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struct i2cdev_s *i2c = oid_lookup(oid, command_config_i2c);
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uint8_t reg_len = args[1];
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uint8_t *reg = command_decode_ptr(args[2]);
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uint32_t clear_set_len = args[3];
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if (clear_set_len % 2 != 0)
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shutdown("i2c_modify_bits: Odd number of bits!");
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uint8_t data_len = clear_set_len/2;
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uint8_t *clear_set = command_decode_ptr(args[4]);
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uint8_t receive_data[reg_len + data_len];
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memcpy(receive_data, reg, reg_len);
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i2c_read(i2c->i2c_config, reg_len, reg, data_len, receive_data + reg_len);
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for (int i = 0; i < data_len; i++) {
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receive_data[reg_len + i] &= ~clear_set[i];
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receive_data[reg_len + i] |= clear_set[data_len + i];
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}
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i2c_write(i2c->i2c_config, reg_len + data_len, receive_data);
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}
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DECL_COMMAND(command_i2c_modify_bits,
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"i2c_modify_bits oid=%c reg=%*s clear_set_bits=%*s");
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