NXP S32K1XX
The S32K1XX series is a family of automotive-grade general-purpose microcontrollers from NXP Semiconductors. The lower end of the family is based on an Arm Cortex-M0+ core and can run at clockspeeds up to 48 MHz. The higher end chips are based on the Arm Cortex-M4F core which runs at up to 80 or 112 MHz.
Supported MCUs
The following list includes MCUs from the S32K1XX series and indicates whether they are supported in NuttX:
MCU |
Support |
Core |
Frequency |
|---|---|---|---|
S32K116 |
Yes* |
Cortex-M0+ |
48 MHz |
S32K118 |
Yes* |
Cortex-M0+ |
48 MHz |
S32K142 |
Yes* |
Cortex-M4F |
112 MHz |
S32K144 |
Yes |
Cortex-M4F |
112 MHz |
S32K146 |
Yes |
Cortex-M4F |
112 MHz |
S32K148 |
Yes |
Cortex-M4F |
112 MHz |
S32K142W |
No** |
Cortex-M4F |
80 MHz |
S32K144W |
No** |
Cortex-M4F |
80 MHz |
Supported Modules & Peripherals
The following list indicates modules and peripherals supported in NuttX. Note that this list does not include all MCU modules. Please refer to the S32K1XX Reference Manual for a complete overview of its features.
Peripheral |
Support |
Comments |
|---|---|---|
ADC |
No |
|
CMP |
No |
|
eDMA |
No |
|
EEPROM |
Yes |
EEPROM emulated by FlexRAM |
ENET |
Yes |
|
FlexCAN |
Yes |
SocketCAN-compatible |
FlexIO |
Yes |
Emulated I2C Master driver |
FTM |
Yes |
PWM driver only |
GPIO |
Yes |
|
LPI2C |
Yes |
I2C Master and Slave |
LPSPI |
Yes |
|
LPUART |
Yes |
|
QSPI |
No |
|
RTC |
Yes |
|
SAI |
No |
ADC
12-Bit Successive Approximation (SAR) Analog-to-Digital Converter (ADC). No driver support (yet).
CMP
Analog Comparator. No driver support (yet).
eDMA
Enhanced Direct Memory Access module. There is a driver that was copied from the i.MX RT port, but this was not tested on S32K1XX.
EEPROM
Emulated EEPROM (implemented by FlexRAM module). A basic block driver is available to read and write data.
ENET
10/100 Mbit/s Ethernet MAC. Only available on S32K148. Driver is available.
FlexCAN
The S32K1XX family has up to 3x FlexCAN modules (which may not all have CAN FD support). A SocketCAN-compatible driver is available.
FlexIO
A configurable module providing a range of functionality like emulation of a variety of serial/parallel communication protocols, flexible 16-bit timers or programmable logic blocks.
The s32k1xx_flexio_i2c.c driver implements an emulated I2C master using FlexIO.
Albeit the current implementation has some limitations:
Max I2C speed of 400KHz
Max transfer of 12 bytes (Could be extended by utilizing EDMA)
No abort on NACK reception, shifter simplies continues on
No multi-master support
No restart support
FTM
A PWM driver based on FlexTimer (FTM) is available.
GPIO
Pins can be configured using s32k1xx_pinconfig() function. Writing to pins is done by s32k1xx_gpiowrite() function and reading is done by s32k1xx_gpioread().
LPI2C
Low-Power Inter-Integrated Circuit (I2C) module supporting an interface to an I2C bus as master and/or
as a slave. The lower-half of this driver is initialize by calling s32k1xx_i2cbus_initialize().
LPSPI
Low-Power Serial Peripheral Interface (SPI) module that supports an interface to an SPI bus as a master
and/or a slave. The lower-half of this driver is initialize by calling s32k1xx_lpspibus_initialize().
LPUART
Low-Power Universal Asynchronous Receiver/Transmitter (UART) module. UART is initialized automatically during MCU boot.
QSPI
QuadSPI memory interface for external serial flash devices. No driver implemented.
RTC
Real-Time Clock module. A basic driver has been implemented.
SAI
The Synchronous Audio Interface for digital audio over I2S (Inter-IC Sound) is only available on S32K148. No driver implemented.