You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
3.1 KiB
115 lines
3.1 KiB
/* |
|
* Copyright (c) 2022 Thomas Stranger |
|
* |
|
* SPDX-License-Identifier: Apache-2.0 |
|
*/ |
|
|
|
#define DT_DRV_COMPAT maxim_ds2485 |
|
|
|
/** |
|
* @brief Driver for the Analog Devices DS2485 1-Wire Master |
|
*/ |
|
|
|
#include "w1_ds2477_85_common.h" |
|
|
|
#include <zephyr/drivers/i2c.h> |
|
#include <zephyr/drivers/w1.h> |
|
#include <zephyr/kernel.h> |
|
#include <zephyr/logging/log.h> |
|
|
|
LOG_MODULE_REGISTER(w1_ds2485, CONFIG_W1_LOG_LEVEL); |
|
|
|
/* upper limits; guaranteed over operating temperature range */ |
|
#define DS2485_T_OSCWUP_us 1000U |
|
#define DS2485_T_OP_us 400U |
|
#define DS2485_T_SEQ_us 10U |
|
|
|
int ds2485_w1_script_cmd(const struct device *dev, int w1_delay_us, uint8_t w1_cmd, |
|
const uint8_t *tx_buf, const uint8_t tx_len, |
|
uint8_t *rx_buf, uint8_t rx_len) |
|
{ |
|
const struct w1_ds2477_85_config *cfg = dev->config; |
|
uint8_t i2c_len = 3 + tx_len; |
|
uint8_t tx_bytes[3 + SCRIPT_WR_LEN] = { |
|
CMD_W1_SCRIPT, tx_len + CMD_W1_SCRIPT_LEN, w1_cmd |
|
}; |
|
uint8_t rx_bytes[3]; |
|
struct i2c_msg rx_msg[2] = { |
|
{ |
|
.buf = rx_bytes, |
|
.len = (CMD_W1_SCRIPT_LEN + CMD_OVERHEAD_LEN), |
|
.flags = I2C_MSG_READ, |
|
}, |
|
{ |
|
.buf = rx_buf, |
|
.len = rx_len, |
|
.flags = (I2C_MSG_READ | I2C_MSG_STOP), |
|
}, |
|
}; |
|
int ret; |
|
|
|
__ASSERT_NO_MSG(tx_len <= SCRIPT_WR_LEN); |
|
memcpy(&tx_bytes[3], tx_buf, tx_len); |
|
ret = i2c_write_dt(&cfg->i2c_spec, tx_bytes, i2c_len); |
|
if (ret < 0) { |
|
return ret; |
|
} |
|
|
|
k_usleep(DS2485_T_OP_us + DS2485_T_SEQ_us + w1_delay_us); |
|
|
|
ret = i2c_transfer_dt(&cfg->i2c_spec, rx_msg, 2); |
|
if (ret < 0) { |
|
LOG_ERR("scripts_cmd fail: ret: %x", ret); |
|
return ret; |
|
} |
|
|
|
if ((rx_bytes[0] != (rx_len + 2)) || (rx_bytes[2] != w1_cmd)) { |
|
LOG_ERR("scripts_cmd fail: response: %x,%x:", |
|
rx_bytes[0], rx_bytes[2]); |
|
return -EIO; |
|
} |
|
|
|
return rx_bytes[1]; |
|
} |
|
|
|
static int w1_ds2485_init(const struct device *dev) |
|
{ |
|
const struct w1_ds2477_85_config *cfg = dev->config; |
|
|
|
if (!device_is_ready(cfg->i2c_spec.bus)) { |
|
LOG_ERR("%s is not ready", cfg->i2c_spec.bus->name); |
|
return -ENODEV; |
|
} |
|
|
|
if (ds2477_85_reset_master(dev)) { |
|
return -EIO; |
|
} |
|
k_usleep(DS2485_T_OSCWUP_us); |
|
|
|
return w1_ds2477_85_init(dev); |
|
} |
|
|
|
static DEVICE_API(w1, w1_ds2485_driver_api) = { |
|
.reset_bus = ds2477_85_reset_bus, |
|
.read_bit = ds2477_85_read_bit, |
|
.write_bit = ds2477_85_write_bit, |
|
.read_byte = ds2477_85_read_byte, |
|
.write_byte = ds2477_85_write_byte, |
|
.read_block = ds2477_85_read_block, |
|
.write_block = ds2477_85_write_block, |
|
.configure = ds2477_85_configure, |
|
}; |
|
|
|
#define W1_DS2485_INIT(inst) \ |
|
static const struct w1_ds2477_85_config w1_ds2477_85_cfg_##inst = \ |
|
W1_DS2477_85_DT_CONFIG_INST_GET(inst, DS2485_T_OP_us, \ |
|
DS2485_T_SEQ_us, \ |
|
ds2485_w1_script_cmd); \ |
|
\ |
|
static struct w1_ds2477_85_data w1_ds2477_85_data_##inst = {}; \ |
|
DEVICE_DT_INST_DEFINE(inst, &w1_ds2485_init, NULL, \ |
|
&w1_ds2477_85_data_##inst, \ |
|
&w1_ds2477_85_cfg_##inst, POST_KERNEL, \ |
|
CONFIG_W1_INIT_PRIORITY, &w1_ds2485_driver_api); |
|
|
|
DT_INST_FOREACH_STATUS_OKAY(W1_DS2485_INIT)
|
|
|