Discovery L053C8

Below are the pins usable for the peripherals. Pins in bold are the default.

SPI

Instance	MOSI	MISO	SCK
SPI1	PA7, PA12, PB5	PA6, PA11, PB4	PA5, PB3
SPI2	PB15	PB14	PB10, PB13

I2C

Instance	SDA	SCL
I2C1	PB7, PB9	PB6, PB8
I2C2	PB11, PB14	PB10, PB13

USART

Instance	RX	TX
USART1	PA10, PB7	PA9, PB6
USART2	PA3, PA15	PA2, PA14

I2S

Instance	CK	SD	WS	MCK
I2S2	PB13	PB15	PB9, PB12	PB14

TIM

Instance	CH1	CH2	CH3	CH4
TIM2	PA0, PA5, PA15	PA1, PB3	PA2, PB10	PA3, PB11
TIM21	PA2, PB13	PA3, PB14
TIM22	PA6, PB4	PA7, PB5

ADC

Instance	Channel	Pin
ADC	IN0	PA0
ADC	IN1	PA1
ADC	IN2	PA2
ADC	IN3	PA3
ADC	IN4	PA4
ADC	IN5	PA5
ADC	IN6	PA6
ADC	IN7	PA7
ADC	IN8	PB0
ADC	IN9	PB1

GPIO

Pin	Peripheral signal available on the pin	Board macro
PA0	ADC_IN0, COMP1_INM, COMP1_OUT, RTC_TAMP2, SYS_WKUP1, TIM2_CH1, TIM2_ETR, TSC_G1_IO1, USART2_CTS
PA1	ADC_IN1, COMP1_INP, LCD_SEG0, TIM2_CH2, TIM21_ETR, TSC_G1_IO2, USART2_DE, USART2_RTS
PA2	ADC_IN2, COMP2_INM, COMP2_OUT, LCD_SEG1, TIM2_CH3, TIM21_CH1, TSC_G1_IO3, USART2_TX
PA3	ADC_IN3, COMP2_INP, LCD_SEG2, TIM2_CH4, TIM21_CH2, TSC_G1_IO4, USART2_RX
PA4	ADC_IN4, DAC_OUT1, SPI1_NSS, TIM22_ETR, TSC_G2_IO1, USART2_CK	SS
PA5	ADC_IN5, SPI1_SCK, TIM2_CH1, TIM2_ETR, TSC_G2_IO2	LED_BUILTIN
PA6	ADC_IN6, COMP1_OUT, LCD_SEG3, LPUART1_CTS, SPI1_MISO, TIM22_CH1, TSC_G2_IO3
PA7	ADC_IN7, COMP2_OUT, LCD_SEG4, SPI1_MOSI, TIM22_CH2, TSC_G2_IO4
PA8	CRS_SYNC, LCD_COM0, RCC_MCO, USART1_CK
PA9	DAC_EXTI9, LCD_COM1, RCC_MCO, TSC_G4_IO1, USART1_TX
PA10	LCD_COM2, TSC_G4_IO2, USART1_RX
PA11	COMP1_OUT, SPI1_MISO, TSC_G4_IO3, USART1_CTS, USB_DM
PA12	COMP2_OUT, SPI1_MOSI, TSC_G4_IO4, USART1_DE, USART1_RTS, USB_DP
PA13	SYS_SWDIO, USB_NOE
PA14	SYS_SWCLK, USART2_TX
PA15	LCD_SEG17, SPI1_NSS, TIM2_CH1, TIM2_ETR, USART2_RX
PB0	ADC_IN8, LCD_SEG5, LCD_VLCD3, SYS_VREF_OUT_PB0, TSC_G3_IO2
PB1	ADC_IN9, LCD_SEG6, LPUART1_DE, LPUART1_RTS, SYS_VREF_OUT_PB1, TSC_G3_IO3
PB2	LCD_VLCD1, LPTIM1_OUT, TSC_G3_IO4
PB3	LCD_SEG7, SPI1_SCK, TIM2_CH2, TSC_G5_IO1	SCK
PB4	LCD_SEG8, SPI1_MISO, TIM22_CH1, TSC_G5_IO2	MISO
PB5	I2C1_SMBA, LCD_SEG9, LPTIM1_IN1, SPI1_MOSI, TIM22_CH2	MOSI
PB6	I2C1_SCL, LPTIM1_ETR, TSC_G5_IO3, USART1_TX
PB7	I2C1_SDA, LPTIM1_IN2, SYS_PVD_IN, TSC_G5_IO4, USART1_RX
PB8	I2C1_SCL, LCD_SEG16, TSC_SYNC	SCL
PB9	I2C1_SDA, I2S2_WS, LCD_COM3, SPI2_NSS	SDA
PB10	I2C2_SCL, LCD_SEG10, LPUART1_TX, SPI2_SCK, TIM2_CH3, TSC_SYNC
PB11	ADC_EXTI11, I2C2_SDA, LCD_SEG11, LPUART1_RX, TIM2_CH4, TSC_G6_IO1
PB12	I2S2_WS, LCD_SEG12, LCD_VLCD2, LPUART1_DE, LPUART1_RTS, SPI2_NSS, TSC_G6_IO2
PB13	I2C2_SCL, I2S2_CK, LCD_SEG13, LPUART1_CTS, SPI2_SCK, TIM21_CH1, TSC_G6_IO3
PB14	I2C2_SDA, I2S2_MCK, LCD_SEG14, LPUART1_DE, LPUART1_RTS, RTC_OUT_ALARM, RTC_OUT_CALIB, SPI2_MISO, TIM21_CH2, TSC_G6_IO4
PB15	I2S2_SD, LCD_SEG15, RTC_REFIN, SPI2_MOSI
PC13	RTC_TAMP1, RTC_TS, SYS_WKUP2
PC14	RCC_OSC32_IN
PC15	RCC_OSC32_OUT
PH0	CRS_SYNC, RCC_OSC_IN
PH1	RCC_OSC_OUT