Modules | Files | Functions

The RE-Mote was designed jointly with universities and industry partners in RERUM European project, to ease the development of private and secure applications for IoT and Smart City applications. More...


 RE-Mote power management driver
 Driver control the power management of the RE-Mote rev B platform.


file  board.c
 Board-initialisation for the Zolertia's RE-Mote revision B platform.
file  board.h
 Header file with definitions related to the I/O connections on the Zolertia's RE-Mote platform (revision B), cc2538-based.


void board_init ()
 Board specific iniatialisation.

RE-Mote LED configuration

LEDs on the RE-Mote are exposed in the JP6 port as follows:

  • LED1 (Red) -> PD4
  • LED2 (Green) -> PB7 (shared with JTAG.TDO)
  • LED3 (Blue) -> PB6 (shared with JTAG.TDI)

The LEDs are connected to a MOSFET to minimize current draw. The LEDs can be disabled by removing resistors R12, R13 and R14.

#define LEDS_ARCH_L1_PIN   4
#define LEDS_ARCH_L2_PIN   7
#define LEDS_ARCH_L3_PIN   6
#define LEDS_CONF_RED   1
#define LEDS_CONF_GREEN   2
#define LEDS_CONF_BLUE   4
#define LEDS_CONF_COUNT   3

UART configuration

On the RE-Mote, the UARTs are connected to the following ports/pins:

  • UART0:
    • RX: PA0, connected to CP2104 serial-to-usb converter TX pin
    • TX: PA1, connected to CP2104 serial-to-usb converter RX pin
  • UART1:
    • RX: PC1
    • TX: PC0
    • CTS: disabled as default, PD0 may be assigned if not using I2C interrupts
    • RTS: disabled as default

We configure the port to use UART0 and UART1, CTS/RTS only for UART1, both without a HW pull-up resistor UART0 and UART1 pins are exposed over the JP6 connector

#define UART0_RX_PIN   0
#define UART0_TX_PIN   1
#define UART1_RX_PIN   1
#define UART1_TX_PIN   0
#define UART1_CTS_PORT   (-1)
#define UART1_CTS_PIN   (-1)
#define UART1_RTS_PORT   (-1)
#define UART1_RTS_PIN   (-1)

ADC configuration

These values configure which CC2538 pins and ADC channels to use for the ADC inputs.

By default the RE-Mote allows two out-of-the-box ADC ports with a phidget-like 3-pin connector (GND/VDD/ADC)

The RE-Mote allows both 3.3V and 5V analogue sensors as follow:

  • ADC1 (PA5): up to 3.3V.
  • ADC2 (PA4): up to 3.3V
  • ADC3 (PA2): up to 5V, by means of a 2/3 voltage divider.

Also there are other ADC channels shared by default with Micro SD card and user button implementations:

  • ADC4 (PA6): up to 3.3V.
  • ADC5 (PA7): up to 3.3V.
  • ADC6 (PA3): up to 3.3V.

ADC inputs can only be on port A. All ADCx are exposed in JP5 connector, but only ADC1 and ADC3 have GND and VDD (3/5V) pins next to it, so these can be exposed into a 3-pin phidget-like connector, for ADC2 either solder a wire to connect, or use a 4-pin connector to expose both ADC1 and ADC2 in a single connector, but this will leave no space for a ADC3 connector.

The internal ADC reference is 1190mV, use either a voltage divider as input, or a different voltage reference, like AVDD5, or externally using PA7/AIN7 and PA6/AIN6 configurable as differential reference, by removing the R26 and R33 0Ohm resistors to disconnect off the Micro-SD, and those will be accessible from JP5 connector.

To enable the ADC[2,4-6], remove any 0Ohm resistors if required (see above), and define in your application ADC_SENSORS_CONF_ADCx_PIN and set its value with the corresponding pin number (i.e ADC2 to 4 as mapped to PA4). To disable any ADC[1-6] just define as above, but set to (-1) instead.

Warning: if using ADC6 (PA3), you will need to disable the bootloader by making FLASH_CCA_CONF_BOOTLDR_BACKDOOR equal to zero

 ADC GPIO control port.
#define ADC_SENSORS_ADC1_PIN   5
 ADC1 to PA5, 3V3.
#define ADC_SENSORS_ADC3_PIN   2
 ADC3 to PA2, 5V.
#define ADC_SENSORS_ADC2_PIN   (-1)
 ADC2 no declared.
#define ADC_SENSORS_ADC4_PIN   (-1)
 ADC4 not declared.
#define ADC_SENSORS_ADC5_PIN   (-1)
 ADC5 not declared.
#define ADC_SENSORS_ADC6_PIN   (-1)
 ADC6 not declared.
#define ADC_SENSORS_MAX   2
 Maximum sensors.

RE-Mote Button configuration

Buttons on the RE-Mote are connected as follows:

  • BUTTON_USER -> PA3, S1 user button, shared with bootloader
  • BUTTON_RESET -> RESET_N line, S2 reset the CC2538
  • BUTTON_PWR -> Depending on the enabled resistor, it can be used to reset the onboard Low-power PIC, provoking a master reset on all the RE-Mote's onboards components. Note the BUTTON_RESET only resets the CC2538. This is disabled by default, as the R45 0Ohm resistor is not soldered on that position The other R45 position enables a test-button to drive the SYSOFF pin of the power management block, disconnecting the battery when used, leaving only powered the RTCC and Low-Power PIC. Useful if developing applications using the shutdown mode if required to snap out of it.
#define BUTTON_USER_PIN   3

SPI (SSI0) configuration

These values configure which CC2538 pins to use for the SPI (SSI0) lines, reserved exclusively for the CC1200 RF transceiver.

These pins are not exposed to any connector, and should be avoid to use it. TX -> MOSI, RX -> MISO

#define SPI0_CLK_PIN   2
#define SPI0_TX_PIN   1
#define SPI0_RX_PIN   3

SPI (SSI1) configuration

These values configure which CC2538 pins to use for the SPI (SSI1) lines, shared with the microSD and exposed over JP5 connector.


#define SPI1_CLK_PIN   4
#define SPI1_TX_PIN   5
#define SPI1_RX_PIN   6

I2C configuration

These values configure which CC2538 pins to use for the I2C lines, exposed over JP6 connector.

The I2C bus is shared with the on-board RTC and the Low-Power PIC The I2C is exposed over the JP6 header, using a 5-pin connector with 2.54 mm spacing, providing also D+3.3V, GND and PD0 pin that can be used as an interrupt pin if required

#define I2C_SCL_PIN   3
#define I2C_SDA_PIN   2
#define I2C_INT_PIN   0

Antenna switch configuration

These values configure the required pin to drive the RF antenna switch, to either enable the sub-1Ghz RF interface (power-up the CC1200) or the 2.4GHz RF interface of the CC2538, both alternatively routed to a RP-SMA connector to allow using an external antenna for both cases.

Note it is also possible to enable both RF interfaces at the same time, by switching On the sub-1GHz RF interface, and placing an 0Ohm resistor (R19), to select between using a ceramic chip antenna (not mounted), or to connect and external antenna over a pigtail to the U.Fl connector (not mounted).

RF switch state:

  • LOW: 2.4GHz RF interface on RP-SMA connector, CC1200 powered-off.
  • HIGH: Sub-1GHz RF interface on RP-SMA connector.
#define ANTENNA_RF_SW_PIN   2

Dual RF interface support

Enables support for dual band operation (both CC1200 and 2.4GHz enabled).

The driver checks the selected Radio stack, and forces the antenna switch to either position. Enabling the definition below forces to skip this check.


CC1200 configuration

These values configure the required pins to drive the CC1200 None of the following pins are exposed to any connector, kept for internal use only

#define CC1200_SPI_INSTANCE   0
#define CC1200_SPI_SCLK_PIN   SPI0_CLK_PIN
#define CC1200_SPI_MOSI_PIN   SPI0_TX_PIN
#define CC1200_SPI_MISO_PIN   SPI0_RX_PIN
#define CC1200_SPI_CSN_PORT   GPIO_B_NUM
#define CC1200_SPI_CSN_PIN   5
#define CC1200_GDO0_PORT   GPIO_B_NUM
#define CC1200_GDO0_PIN   4
#define CC1200_GDO2_PORT   GPIO_B_NUM
#define CC1200_GDO2_PIN   0
#define CC1200_RESET_PORT   GPIO_C_NUM
#define CC1200_RESET_PIN   7
#define CC1200_GPIOx_VECTOR   GPIO_B_IRQn

microSD configuration

These values configure the required pins to drive the built-in microSD external module, to be used with SSI1.

USD_CSN and USD_SEL are shared with ADC4/ADC5, but it is disabled by default as there are 0Ohm resistors connecting the PA6/PA7 pins to the microSD (see ADC block above for comments) The USD_SEL pin can be used both as output and input, to detect if there is a microSD in the slot, or when connected to disable the microSD to save power

#define USD_SPI_INSTANCE   1
#define USD_CSN_PIN   7
#define USD_SEL_PIN   6

Power management and shutdown mode

The shutdown mode is an ultra-low power operation mode that effectively powers-down the entire RE-Mote (CC2538, CC1200, attached sensors, etc) and only keeps running a the on-board RTC and an ultra-low power consumption MCU The Shutdown mode allows:

  • Put the board in an ultra-low power sleep (shutdown) drawing <150nA avg.
  • Awake the system by scheduling the RTCC to awake the Low-Power PIC after it disconnects the battery and goes to sleep mode.
  • Awake the system by using the Low-Power PIC's timer

As commented above, S3 can be used to restart the entire board (power management block included), or to kick the board out of shutdown mode by reconnecting the battery.

#define PM_ENABLE_PIN   1

On-board RTCC

The on-board RTCC (real time clock-calendar) is powered over USB/battery, and it will remain powered in shutdown mode with the Low-Power PIC.

The RTC_INT1 is connected to the CC2538, so it is possible to receive interrupts from a pre-configured alarm, even waking up the CC2538 from PM3. A second interruption pin (RTC_INT2) is connected to the Low-Power PIC, after configuring the RTCC the Low-Power PIC can drive the board to shutdown mode, and enter into low-power mode (sleep), being the RTCC interrupt the waking up source to resume operation.

#define PLATFORM_HAS_RTC   1
#define RTC_INT1_PIN   3

On-board external WDT

The RE-Mote features an on-board external WDT and battery monitor, which adds more robustness and prevents the mote to run wild if any unexpected problem shows-up.

The external WDT requires a short pulse (<1ms) to be sent before a 2-second period. The battery monitor keeps the device in Reset if the voltage input is lower than 2.5V. The external WDT can be disabled by removing the R34 0Ohm resistor. As default the Texas Instrument's TPS3823 WDT is not mounted. Alternatively the testpoint or unused WDT's pad can be used to re-use as GPIO

#define EXT_WDT_PIN   5

Device string used on startup

#define BOARD_STRING   "Zolertia RE-Mote revision B platform"

Detailed Description

The RE-Mote was designed jointly with universities and industry partners in RERUM European project, to ease the development of private and secure applications for IoT and Smart City applications.

The RE-Mote packs several on-board resources, like a RTC, external WDT, Micro-SD, RF switch and a Shutdown mode to reduce its power consumption down to 150nA.

This file provides connectivity information on LEDs, Buttons, UART and other RE-Mote revision A peripherals

This file can be used as the basis to configure other platforms using the cc2538 SoC.