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