MAX149X6 no-OS driver
Supported Devices
Overview
MAX14906 and MAX14916 share the same API when referring to the CRC algorithm, register read, write and update. Although, each of them has its own register map and a specific API, therefore there are two files (header and source file) for them called max149x6-base.h and max149x6-base.c which includes the common stuff. Each of these devices then has its own driver files which includes the base driver files and uses the common API within their specific APIs.
MAX14906 is an IEC 61131-2 compliant, high-speed, four-channel industrial digital output/input device that can be configured on a per-channel basis as a high-side (HS) switch, push-pull (PP) driver, or a Type 1 and 3, or Type 2 digital input. The MAX14906 is specified for operation with a supply voltage up to 40V and is tolerant to 65V.
MAX14916 on the other side has eight high-side switched specified to deliver up to 1.1A (min) continuous current per channel. The two adjacent channels can pe paralleled to form four 2.4A high-side switches. The high-side switches have on-resistance of 250mOhms (max) at 125 degrees Celsius ambient temperature.
Applications
MAX14906
Industrial Digital Output and Input Module
Configurable Digital Input/Output
Motor Control
PLC systems
Distributed Control Systems (DCS)
MAX14906 Device Configuration
Driver Initialization
In order to be able to use the device, you will have to provide the support for the communication protocol (SPI).
The first API to be called is max14906_init. Make sure that it returns 0, which means that the driver was initialized correctly.
Channel Configuration
Each channel cand be configured either as a digital input or a digital output. In order to do that you need to call the max14906_ch_func API. The state of a channel (voltage state) cand be read with the max14906_ch_get API. If a specific channel is set as an output you can also set the logic state of the channel with max14906_ch_set API.
Current Limit Configuration
Current limit for each channel can be set and read with max14906_climit_set, respectively with max14906_climit_get APIs.
Interrupts Configuration
The device allows the usage of interrupts which can be mapped to FAULT pin and is configured like any other no-os interrupt (using no_os_irq API).
MAX14906 Driver Initialization Example
struct max149x6_desc *max14906;
struct no_os_spi_init_param spi_ip = {
.device_id = 0,
.extra = &max14906_spi_extra,
.max_speed_hz = 100000,
.platform_ops = &max_spi_ops,
.chip_select = 0,
};
struct max149x6_init_param max14906_ip = {
.chip_address = 0;
.comm_desc = &spi_ip;
.crc_en = true;
}
ret = max14906_init(&max14906, &max14906_ip);
if (ret)
goto error;
MAX14906 no-OS IIO support
The MAX14906 IIO driver comes on top of the MAX14906 driver and offers support for interfacing IIO clients through IIO lib.
MAX14906 IIO Devce Configuration
Device Attributes
Output Attributes
MAX14906 has 2 output attributes(do mode, current limit).
DO MODE means the configuration of the device, there is also a do mode avail attribute which means the do mode available(list of configuration modes) for the device.
Current Limit means the current limit set on by the device on a specific output channel. There is also a current limit avail attribute which contains a list with the available limits for the output current.
Input Attributes
IEC Type attribute contains information about the IEC type used by the device. For this one user also has to select from the IEC type available attribute to assign IEC Type a value.
Device Channels
MAX14906 has a specific API, max14906_iio_setup_channels for configuring the channels at the initialization, therefore the channels can be configured as input or output as requested.
MAX14906 IIO Driver Initialization Example
struct max149x6_init_param max14906_ip = {
.chip_address = 0;
.comm_desc = &spi_ip;
.crc_en = true;
}
struct max14906_iio_desc *max14906_iio_desc;
struct max14906_iio_desc_init_param max14906_iio_ip = {
.max14906_ip = &max14906_ip,
.channel_configs = {
{
.enabled = true,
.function = MAX14906_OUT,
},
{
.enabled = true,
.function = MAX14906_IN,
},
{
.enabled = true,
.function = MAX14906_OUT,
},
{
.enabled = true,
.funtion = MAX14906_IN,
},
},
};
struct iio_app_desc *app;
struct iio_app_init_param app_init_param = { 0 };
ret = max14906_iio_init(&max14906_iio_desc, &max14906_iio_ip);
if (ret)
goto error;
struct iio_app_device iio_devices[] = {
{
.name = "max14906",
.dev = max14906_iio_desc,
.dev_descriptor = max14906_iio_desc->iio_dev,
}
};
app_init_param.devices = iio_devices;
app_init_param.nb_devices = NO_OS_ARRAY_SIZE(iio_devices);
app_init_param.uart_init_params = max14906_uart_ip;
ret = iio_app_init(&app, app_init_param);
if (ret)
goto error;
return iio_app_run(app);
MAX14916
Industrial Digital Outputs
PLC systems
MAX14916 Device Configuration
Driver Initialization
In order to be able to use the device, you will have to provide the support for the communication protocol (SPI).
The first API to be called is max14916_init. Make sure that it returns 0, which means that the driver was initialized correctly.
Channel Configuration
Each channel can be configured as a digital output only. The state of a channel(voltage state) cand be read with the max14916_ch_get API and also set with max14916_ch_set.
LED Configuration
Status LEDs cand be configured with max14916_sled_set which takes as parameters the device descriptor, the number of the channel requested for the LED state to change and the requested state.
Fault LEDs state however can not be set by the user since they indicate the case of a fault, still they have a configurable minimum on-time value assigned to them which the user can change through the max14916_fled_time_set API.
Interrupts Configuration
The device allows the usage of interrupts which can be mapped to FAULT pin and is configured like any other no-os interrupt(using no_os_irq API) since the descriptor is common for both MAX14916 and MAX14906.
MAX14916 Driver Initialization Example
struct max149x6_desc *max14916;
struct no_os_spi_init_param spi_ip = {
.device_id = 1,
.extra = &max14916_spi_extra,
.max_speed_hz = 100000,
.platform_ops = &max_spi_ops,
.chip_select = 1,
};
struct max149x6_init_param max14916_ip = {
.chip_address = 0;
.comm_desc = &spi_ip;
.crc_en = true;
}
ret = max14916_init(&max14916, &max14916_ip);
if (ret)
goto error;
MAX14916 no-OS IIO support
The MAX14916 IIO driver comes on top of the MAX14916 driver and offers support for interfacing IIO clients through IIO lib.
MAX14916 IIO Devce Configuration
Device Attributes
MAX14916 has only 3 attributes :
raw - indicates the state of a channel(0 or 1).scale - which is always 1 because the device doesn't have any other scale.offset - which is 0.
MAX14916 IIO Driver Initialization Example
struct max149x6_init_param max14916_ip = {
.chip_address = 0;
.comm_desc = &spi_ip;
.crc_en = true;
}
struct max14916_iio_desc *max14916_iio_desc;
struct max14916_iio_desc_init_param max14916_iio_ip = {
.max14916_ip = &max14916_ip,
.ch_enable = {
true, true, true, true
}
},
};
struct iio_app_desc *app;
struct iio_app_init_param app_init_param = { 0 };
ret = max14916_iio_init(&max14916_iio_desc, &max14916_iio_ip);
if (ret)
goto error;
struct iio_app_device iio_devices[] = {
{
.name = "max14916",
.dev = max14916_iio_desc,
.dev_descriptor = max14916_iio_desc->iio_dev,
}
};
app_init_param.devices = iio_devices;
app_init_param.nb_devices = NO_OS_ARRAY_SIZE(iio_devices);
app_init_param.uart_init_params = max14916_uart_ip;
ret = iio_app_init(&app, app_init_param);
if (ret)
goto error;
return iio_app_run(app);