164 lines
4.5 KiB
C
164 lines
4.5 KiB
C
/**************************************************************************//**
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*
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* @copyright (C) 2019 Nuvoton Technology Corp. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-1-16 Wayne First version
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*
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******************************************************************************/
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#include <rtconfig.h>
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#if defined(NU_PKG_USING_MAX31875)
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#include <sys/time.h>
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#include "sensor_max31875.h"
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#define DBG_ENABLE
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#define DBG_LEVEL DBG_LOG
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#define DBG_SECTION_NAME "sensor.max31875"
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#define DBG_COLOR
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#include <rtdbg.h>
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static S_MAX31875 g_sMax31875;
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static struct rt_i2c_bus_device *i2c_bus_dev;
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static int max31875_i2c_write_reg(int address, const char *data, int length)
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{
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struct rt_i2c_msg msg;
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msg.addr = address; /* Slave address */
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msg.flags = RT_I2C_WR; /* Write flag */
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msg.buf = (rt_uint8_t *)data; /* Slave register address */
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msg.len = length; /* Number of bytes sent */
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if (rt_i2c_transfer(i2c_bus_dev, &msg, 1) != 1)
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{
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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static int max31875_i2c_read_reg(int address, const char *reg, int reg_length, char *data, int length)
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{
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struct rt_i2c_msg msgs[2];
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msgs[0].addr = address; /* Slave address */
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msgs[0].flags = RT_I2C_WR; /* Write flag */
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msgs[0].buf = (rt_uint8_t *)reg; /* Slave register address */
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msgs[0].len = reg_length; /* Number of bytes sent */
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msgs[1].addr = address; /* Slave address */
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msgs[1].flags = RT_I2C_RD; /* Read flag without READ_ACK */
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msgs[1].buf = (rt_uint8_t *)data; /* Read data pointer */
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msgs[1].len = length; /* Number of bytes read */
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if (rt_i2c_transfer(i2c_bus_dev, &msgs[0], 2) != 2)
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{
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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static rt_ssize_t max31875_fetch_data(rt_sensor_t sensor, rt_sensor_data_t data, rt_size_t len)
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{
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RT_ASSERT(data);
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if (sensor->info.type == RT_SENSOR_CLASS_TEMP)
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{
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float temp_value;
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temp_value = max31875_read_reg_as_temperature(MAX31875_REG_TEMPERATURE, &g_sMax31875);
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data->type = RT_SENSOR_CLASS_TEMP;
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data->data.temp = (rt_int32_t)(temp_value * 10);
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data->timestamp = rt_sensor_get_ts();
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}
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return 1;
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}
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static rt_err_t max31875_control(struct rt_sensor_device *sensor, int cmd, void *args)
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{
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return -RT_ERROR;
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}
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static struct rt_sensor_ops sensor_ops =
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{
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max31875_fetch_data,
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max31875_control
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};
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int rt_hw_max31875_temp_init(const char *name, struct rt_sensor_config *cfg)
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{
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rt_int8_t result;
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rt_sensor_t sensor = RT_NULL;
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sensor = rt_calloc(1, sizeof(struct rt_sensor_device));
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if (sensor == RT_NULL)
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return -(RT_ENOMEM);
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sensor->info.type = RT_SENSOR_CLASS_TEMP;
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sensor->info.vendor = RT_SENSOR_VENDOR_UNKNOWN;
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sensor->info.model = "max31875_temp";
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sensor->info.unit = RT_SENSOR_UNIT_DCELSIUS;
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sensor->info.intf_type = RT_SENSOR_INTF_I2C;
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sensor->info.range_max = 70;
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sensor->info.range_min = 0;
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sensor->info.period_min = 100; //100ms
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rt_memcpy(&sensor->config, cfg, sizeof(struct rt_sensor_config));
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sensor->ops = &sensor_ops;
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result = rt_hw_sensor_register(sensor, name, RT_DEVICE_FLAG_RDWR, RT_NULL);
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if (result != RT_EOK)
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{
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LOG_E("device register: %d", result);
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rt_free(sensor);
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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int rt_hw_max31875_init(const char *name, struct rt_sensor_config *cfg)
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{
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struct rt_sensor_intf *intf;
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rt_err_t ret = RT_ERROR;
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RT_ASSERT(name != NULL);
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RT_ASSERT(cfg != NULL);
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intf = &cfg->intf;
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/* Find I2C bus */
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i2c_bus_dev = (struct rt_i2c_bus_device *)rt_device_find(intf->dev_name);
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if (i2c_bus_dev == RT_NULL)
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{
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goto exit_rt_hw_max31875_init;
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}
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g_sMax31875.read = max31875_i2c_read_reg;
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g_sMax31875.write = max31875_i2c_write_reg;
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g_sMax31875.address = (uint32_t)(intf->user_data) & 0xff;
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if ((ret = max31875_init(g_sMax31875.address)) != RT_EOK)
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{
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LOG_E("Init..!\n");
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}
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else if ((ret = max31875_write_cfg(MAX31875_CFG_CONV_RATE_8 | MAX31875_CFG_RESOLUTION_12BIT, &g_sMax31875)) != RT_EOK)
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{
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LOG_E("Write_cfg..!\n");
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}
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else
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return rt_hw_max31875_temp_init(name, cfg);
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exit_rt_hw_max31875_init:
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return -(ret);
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}
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#endif //#if defined(NU_PKG_USING_MAX31875)
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