STM32MP157C-EV1 - hardware description

This article provides an overview of STM32MP157x-EV1 Evaluation boards.

1. Article purpose

This article briefly describes:

• How to assemble together the different elements provided in the commercial box
• What are the different components present on the boards
• How to connect the boards to external material
• How to configure the board for boot
• How to select RS232 UART or ST-LINK/V2-1 connectors
• What are the configurations of the connectors pins

This article is valid both for the STM32MP157A-EV1 and STM32MP157C-EV1 Evaluation boards: the part numbers are specified in the STM32MP15 microprocessor part numbers article.

Warning

This article is only an introduction to the STM32MP157x-EV1 Evaluation board. Detailed information can be found in the STM32MP157x-EV1 evaluation board user manual.

2. Board assembly

The STM32MP157x-EV1 Evaluation boards packages (STM32MP157A-EV1 and STM32MP157C-EV1) include all the items listed below.

Out of the STM32MP157x-EV1 box
STM32MP157A-EV1 shown here (picture is not contractual)

Position	Description
1	MB1262 motherboard
2	MB1263 daughterboard
3	MB1230 DSI 720p display
4	MB1379 daughterboard camera
5	microSD card
6	Power supply block (5V, 3A)

The following figures explain how to assemble these different items to get the STM32MP157x-EV1 Evaluation boards.

STM32MP157x-EV1 Evaluation board assembly
STM32MP157A-EV1 shown here (picture is not contractual)

STM32MP157x-EV1 Evaluation board assembled
STM32MP157A-EV1 shown here (picture is not contractual)

3. Board overview

Position	Description
1	MB1262 motherboard
2	MB1263 daughterboard
3	MB1230 DSI 720p display
4 (CN7)	MB1379 daughterboard camera
5	microSD card

Position	Description	Position	Description
10 (CN3)	Ethernet	11 (CN8)	Microphone MEMS daughterboard connector
12 (CN4)	Speaker audio output	13 (CN5)	Headset audio output
14 (U8)	Audio codec (Wolfson WM8994)	15 (CN1)	SPDIF RX (input)
16 (CN2)	SPDIF TX (output)	17 (U5)	SmartCard (back side slot)
18 (LD1)	Ethernet LED (green)	19 (CN6)	Ethernet daughterboard connector
20 (U10)	Trace connector	21 (CN11)	LTDC connector
22 (CN12)	RS232 (UART4)	23 (CN13)	External E2P connector
24 (CN16)	USB micro-AB (OTG)	25 (LD2)	USB OTG LED (green)
26 (LD3)	USB Type-A LED (red)	27 (CN17)	MFX header 4 pins
28 (CN14)	JTAG connector	29 (CN15)	CAN FD
30 (CN18)	2 USB Type-A (host)	31 (CN20)	2 USB Type-A (host)
32 (B2)	Reset button	33 (B1)	Joystick
34 (CN22)	Motor control connector	35 (CN21)	GPIO expansion connector

STM32MP157x-EV1 Evaluation board front side
STM32MP157A-EV1 shown here (picture is not contractual)

Position	Description	Position	Description
50 (B1)	Reset button	51 (LD2)	User LED (red)
52 (B2)	User button (PA13)	53 (LD3)	User LED (green)
54 (B3)	User button (PA14)	55 (LD5)	User LED (blue)
56 (LD4)	User LED (orange)	57 (B4)	Wakeup button
58 (LD1)	Power LED (green)	59 (CN1)	MB1263 power 5V-3A
60 (SW1)	Boot mode selection	61 (U3)	PMIC (STPMIC1A)
62 (LD6)	ST-LINK/V2-1 LED (bicolor)	63 (CN4)	USB micro-B (ST-LINK/V2-1)
64 (U4)	STM32MP157x 18x18	65 (U5)	eMMC
66 (U6/U7)	2 x DDR3L 16 bits	67 (µSD)	microSD 3.0 card (back side slot)

Details about some LEDs:

4. Board connection

The connections shown in the picture below are the ones recommended to start with the STM32MP157x-EV1 Evaluation boards. As shown in the board overview, other connectors are available for this board (for example CAN).

STM32MP157x-EV1 Evaluation board connections

STM32MP157A-EV1 shown here (picture is not contractual)

5. Switches and jumpers

Most of default settings of the switches and jumpers shall be kept as set in the commercial box.

There are 3 main exceptions:

• the jumpers related to UART4
• the switches related to boot
• the jumper JP1 that must be removed

The picture and sections below detail the main boot switches and the UART4 jumpers.

MB1263 zoom on some switches and jumpers

5.1. Boot related switches

The STM32MP157x-EV1 Evaluation boards can boot from different Flash devices (microSD, eMMC...); using the microSD card is recommended.

Boot modes

Boot mode	Boot 2	Boot 1	Boot 0
Engineering boot	1	0	0
NOR	0	0	1
microSD card	1	0	1
eMMC	0	1	0
NAND	0	1	1
Forced USB boot for flashing	0	0	0

The boot related switches (SW1 on the board overview picture) must be configured as illustrated by one of the following pictures:

Engineering boot	Boot from NOR
Boot from microSD card	Boot from eMMC
Boot from NAND	Forced USB boot for flashing

5.2. UART4 related jumpers: RS232 or ST-LINK/V2-1?

The UART4 is shared exclusively between 2 connectors:

• RS232, D-type, 9-pin connector (CN12 on the board overview picture), dedicated to communication through RS232,
• USB micro-B (ST-LINK/V2-1) (CN4 on the board overview picture), dedicated to the RS232 of ST-LINK/V2-1 controller

The connection is switched by setting JP4 and JP5 jumpers as shown in following pictures:

UART4 is connected to the RS232, D-type, 9-pins CN12 connector

UART4 is connected to the USB micro-B ST-LINK/V2-1 CN4 connector

6. GPIO mapping

6.1. Motor control connector

The pins of the motor control connector (CN22 on the board overview picture) are described in the following table.
Due to the sharing of some IOs by multiple peripherals, the motor control interface is not enabled by default, and the motor control cannot be operated simultaneously with the camera, audio codec, CAN and GPIO expansion (GPIO6, 7 and 12): more details (e.g. enabling the motor control interface) in the STM32MP157x-EV1 evaluation board user manual.

Warning

The pin 1 position (upper left) on this figure is the opposite compared to the board (bottom right)

Motor control connector

Description	Function	STM32 pin	Pin	Pin	STM32 pin	Function	Description
Emergency Stop	TIM8_BKIN	PA6	1	2	-	-	GND
MC_UH	TIM8_CH1	PI5	3	4	-	-	GND
MC_UL	TIM8_CH1N	PH13	5	6	-	-	GND
MC_VH	TIM8_CH2	PI6	7	8	-	-	GND
MC_VL	TIM8_CH2N	PH14	9	10	-	-	GND
MC_WH	TIM8_CH3	PI7	11	12	-	-	GND
MC_WL	TIM8_CH3N	PH15	13	14	PA3	ADC_1_IN15	Bus Voltage
PhaseA current	ADC_1_IN6	PF12	15	16	-	-	GND
PhaseB current	ADC_1_IN0	ANA0	17	18	-	-	GND
PhaseC current	ADC_2_IN1	ANA1	19	20	-	-	GND
NTC ByPass	GPIO	PF3	21	22	-	-	GND
Dissipative Brake	TIM12_CH1	PH6	23	24	-	-	GND
5V	-	-	25	26	PF11	ADC_1_IN2	Heatsink Temperature
PFC Sync	TIM4_ETR	PE0	27	28	-	-	3V3
PFC PWM	TIM4_CH3	PB8	29	30	-	-	GND
Encoder A	TIM5_CH1	PH10	31	32	-	-	GND
Encoder B	TIM5_CH2	PH11	33	34	PH12	TIM5_CH3	Encoder Index

6.2. GPIO expansion connector

The pins of the GPIO expansion connector (CN21 on the board overview picture) are described in the following table:

Warning

The pin 1 position (upper left) on this figure is the opposite compared to the board (bottom right)

GPIO expansion connector

Function	STM32 pin	Pin	Pin	STM32 pin	Function
3V3	-	1	2	-	5V
GPIO2 / I2C5_SDA	PA12	3	4	-	5V
GPIO3 / I2C5_SCL	PA11	5	6	-	GND
GPIO4 / MCO1	PI11	7	8	PB10	GPIO14 / USART3_TX
GND	-	9	10	PB12	GPIO15 / USART3_RX
GPIO17 / USART3_RTS	PG8	11	12	PI5	GPIO18 / SAI2_SCKA
GPIO27 / SDMMC3_D3	PD7	13	14	-	GND
GPIO22 / SDMMC3_CK	PG15	15	16	PF1	GPIO23 / SDMMC3_CMD
3V3	-	17	18	PF0	GPIO24 / SDMMC3_D0
GPIO10 / SPI1_MOSI	PZ2	19	20	-	GND
GPIO9 / SPI1_MISO	PZ1	21	22	PF4	GPIO25 / SDMMC3_D1
GPIO11 / SPI1_SCK	PZ0	23	24	PZ3	GPIO8 / SPI1_NSS
GND	-	25	26	-	GPIO7 / RPI_GPIO7
ID_SD / I2C2_SDA	PH5	27	28	PH4	ID_SC / I2C2_SCL
GPIO5 / MCO2	PG2	29	30	-	GND
GPIO6 / TIM2_CH4	PA3	31	32	PH6	GPIO12 / TIM12_CH1
GPIO13 / TIM8_CH4	PI2	33	34	-	GND
GPIO19 / SAI2_FSA	PI7	35	36	PI10	GPIO16 / USART3_CTS
GPIO26 / SDMMC3_D2	PF5	37	38	PI6	GPIO20 / SAI2_SDA
GND	-	39	40	PF11	GPIO21 / SAI2_SDB

6.3. JTAG connector

The pins of the JTAG connector (CN14 on the board overview picture) are described in the following table:

JTAG connector

Function	Pin	Pin	Function
Power	1	2	Power
NJTRST	3	4	GND
JTDI	5	6	GND
JTMS / SWDIO	7	8	GND
JTCK / SWCLK	9	10	GND
Pull down	11	12	GND
JTDO / SWO	13	14	GND
NRST	15	16	GND
Pull down	17	18	GND
pull down	19	20	GND

6.4. User buttons and LEDs

The GPIO assignments for the user buttons and LEDs are described in the following table. Refer to LEDs and buttons on STM32 MPU boards article to get information on the functional mapping for each one.

GPIO for user buttons and LEDs

LED color and label	Button label	GPIO
Green LD3 (*)	USER1 (*)	PA14
Red LD2 (*)	USER2 (*)	PA13
Orange LD4	-	PD8
Blue LD5	-	PD9

Warning

(*) Both a LED and a button are connected to the same GPIO, with inverted logic for the LED control (so the LED is switched on when the GPIO output is set to low).

Universal Asynchronous Receiver/Transmitter

Display Serial Interface (MIPI^® Alliance standard)

Receive

Transmit

Light-emitting diode

LCD TFT Display Controller (STM32 specific)

USB On-The-Go (Capability/type of USB port, acting primarily as USB device, to also act as USB host. Also known as USB OTG.)

USB port or connector

debug and test protocol, named from the Joint Test Action Group that developed it

Controller Area Network (robust bus mainly used for automotive applications)

General-Purpose Input/Output (A realization of open ended transmission between devices on an embedded level. These pins available on a processor can be programmed to be used to either accept input or provide output to external devices depending on user desires and applications requirements.)

Power Management Integrated Circuit

former spelling for e•MMC ('e' in italic)

Flash memory shortened to gain space in titles, tables and block diagrams

Analog-to-digital converter. The process of converting a sampled analog signal to a digital code that represents the amplitude of the original signal sample.

Pulse Width Modulation

Serial DAta line

Serial clock line

Secure digital

Compatibility Test Suite (Android specific) or Clear to send (in UART context)

Inter-Integrated Circuit (Bi-directional 2-wire bus standard for efficient inter-IC control.)

Universal Asynchronous Receiver/Transmitter

Display Serial Interface (MIPI^® Alliance standard)

Receive

Transmit

Light-emitting diode

LCD TFT Display Controller (STM32 specific)

USB On-The-Go (Capability/type of USB port, acting primarily as USB device, to also act as USB host. Also known as USB OTG.)

USB port or connector

debug and test protocol, named from the Joint Test Action Group that developed it

Controller Area Network (robust bus mainly used for automotive applications)

General-Purpose Input/Output (A realization of open ended transmission between devices on an embedded level. These pins available on a processor can be programmed to be used to either accept input or provide output to external devices depending on user desires and applications requirements.)

Power Management Integrated Circuit

former spelling for e•MMC ('e' in italic)

Flash memory shortened to gain space in titles, tables and block diagrams

Analog-to-digital converter. The process of converting a sampled analog signal to a digital code that represents the amplitude of the original signal sample.

Pulse Width Modulation

Serial DAta line

Serial clock line

Secure digital

Compatibility Test Suite (Android specific) or Clear to send (in UART context)

Inter-Integrated Circuit (Bi-directional 2-wire bus standard for efficient inter-IC control.)

Mobile Industry Processor Interface, open membership organization that includes leading companies in the mobile industry that share the objective of defining and promoting open specifications for interfaces inside mobile terminals, see MIPI^® Alliance standard web site https://www.mipi.org

Capability/type of USB port, acting primarily as USB device, to also act as USB host. Also known as USB OTG.

MultimediaCard

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