325 lines
13 KiB
ReStructuredText
325 lines
13 KiB
ReStructuredText
=====================
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ST STM32L Discovery
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=====================
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This page discusses issues unique to NuttX configurations for the
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STMicro STM32L-Discovery development board. The STM32L-Discovery board
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is based on the STM32L152RBT6 MCU (128KB FLASH and 16KB of SRAM).
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The STM32L-Discovery and 32L152CDISCOVERY kits are functionally
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equivalent. The difference is the internal Flash memory size (STM32L152RBT6
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with 128 Kbytes or STM32L152RCT6 with 256 Kbytes).
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Both boards feature:
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- An ST-LINK/V2 embedded debug tool interface,
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- LCD (24 segments, 4 commons),
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- LEDs,
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- Pushbuttons,
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- A linear touch sensor, and
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- Four touchkeys.
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..
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GPIO Pin Usage
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==============
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===== ===================== ================================ ================
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GPIO ALTERNATE FUNCTION BOARD FUNCTION P1/P2
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===== ===================== ================================ ================
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PA0 WKUP1/USART2_CTS/ Push button (PA0), WAKE UP (Iuu) P1, pin 15
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ADC_IN0/TIM2_CH1_ETR
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/COMP1_INP
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PA1 USART2_RTS/ADC_IN1/ LCD SEG0 P1, pin 16
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TIM2_CH2/LCD_SEG0/
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COMP1_INP
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PA2 USART2_TX/ADC_IN2/ LCD SEG1 P1, pin 17
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TIM2_CH3/TIM9_CH1/
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LCD_SEG1/COMP1_INP
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PA3 USART2_RX/ADC_IN3/ LCD SEG2 P1, pin 18
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TIM2_CH4/TIM9_CH2/
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LCD_SEG2/COMP1_INP
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PA4 SPI1_NSS/USART2_CK/ Measurement (Iuu) P1, pin 19
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ADC_IN4/DAC_OUT1/
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COMP1_INP
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PA5 SPI1_SCK/ADC_IN5/ --- P1, pin 20
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DAC_OUT2/
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TIM2_CH1_ETR/COMP1_
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INP
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PA6 SPI1_MISO/ADC_IN6/ Linear Touch Sensor (PA6) ---
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TIM3_CH1/TIM1_BKIN/
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LCD_SEG3/TIM10_CH1/
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COMP1_INP
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PA7 SPI1_MOSI/ADC_IN7/ Linear Touch Sensor (PA7) ---
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TIM3_CH2/TIM1_CH1N
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/LCD_SEG4/TIM11_CH1/
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PA8 USART1_CK/MCO/ LCD glass COM0 P2, pin 23
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LCD_COM0
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PA9 USART1_TX/LCD_COM1 LCD glass COM1 P2, pin 22
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PA10 USART1_RX/LCD_COM2 LCD glass COM2 P2, pin 21
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PA11 USART1_CTS/USBDM/ --- P2, pin 20
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SPI1_MISO
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PA12 USART1_RTS/USBDP/ --- P2, pin 19
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SPI1_MOSI
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JTDI TIM2_CH1_ETR/PA15/ LCD_SEG12 P2, pin 16
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SPI1_NSS/LCD_SEG17
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PB0 ADC_IN8/TIM3_CH3/ Linear Touch Sensor (PB0) ---
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LCD_SEG5/COMP1_INP/
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VREF_OUT
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PB1 ADC_IN9/TIM3_CH4/ Linear Touch Sensor (PB1) ---
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LCD_SEG6/COMP1_INP/
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VREF_OUT
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PB2/ --- --- P1, pin 21
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BOOT1
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JTDO TIM2_CH2/PB3/TRACES LCD_SEG3, SWO P2, pin 11
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WO/SPI1_SCK/COMP2_I
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NM/LCD_SEG7
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JNTRST TIM3_CH1/PB4/SPI1_MIS SEG4 P2, pin 10
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O/COMP2_INP/LCD_SEG8
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PB5 I2C1_SMBAl/TIM3_CH2/ LCD SEG5 P2, pin 9
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SPI1_MOSI/COMP2_INP/
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LCD_SEG9
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PB6 I2C1_SCL/TIM4_CH1/ LED Blue P2, pin 8
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USART1_TX/LCD_SEG8
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PB7 I2C1_SDA/TIM4_CH2/ LED Green P2, pin 7
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USART1_RX/PVD_IN
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PB8 TIM4_CH3/I2C1_SCL/ LCD SEG13 P2, pin 4
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LCD_SEG16/TIM10_CH1
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PB9 TIM4_CH4/I2C1_SDA/ LCD glass COM3 P2, pin 3
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LCD_COM3/TIM11_CH1
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PB10 I2C2_SCL/USART3_TX/ LCD SEG6 P1, pin 22
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TIM2_CH3/LCD_SEG10
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PB11 I2C2_SDA/USART3_RX/ LCD SEG7 P1, pin 23
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TIM2_CH4/LCD_SEG11
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PB12 SPI2_NSS/I2C2_SMBA/ LCD SEG8 P1, pin 24
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USART3_CK/LCD_SEG12
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2/ADC_IN18/COMP1_INP
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/ TIM10_CH1
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PB13 SPI2_SCK/USART3_CTS/ LCD SEG9 P1, pin 25
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LCD_SEG13/ADC_IN19/
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COMP1_INP/TIM9_CH1
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PB14 SPI2_MISO/USART3_RT LCD SEG10 P1, pin 26
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S/LCD_SEG14/ADC_IN20
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/ COMP1_INP/TIM9_CH2
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PB15 SPI2_MOSI/TIM1_CH3N/ LCD SEG11 P1, pin 27
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LCD_SEG15/ADC_IN21/
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COMP1_INP/TIM11_CH1/
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RTC_50_60Hz
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PC0 ADC_IN10/LCD_SEG18/ LCD SEG14 P1, pin 11
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COMP1_INP
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PC1 ADC_IN11/LCD_SEG19/ LCD SEG15 P1, pin 12
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COMP1_INP
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PC2 ADC_IN12/LCD_SEG20/ LCD SEG16 P1, pin 13
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COMP1_INP
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PC3 ADC_IN13/LCD_SEG21/ LCD SEG17 P1, pin 14
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COMP1_INP
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PC4 ADC_IN14/LCD_SEG22/ Linear Touch Sensor (PC4) ---
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COMP1_INP
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PC5 ADC_IN15/LCD_SEG23/ Linear Touch Sensor (PC5) ---
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COMP1_INP
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PC6 TIM3_CH1/LCD_SEG24 LCD SEG18 P2, pin 27
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PC7 TIM3_CH2/LCD_SEG25 LCD SEG19 P2, pin 26
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PC8 TIM3_CH3/LCD_SEG26 LCD SEG20 P2, pin 25
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PC9 TIM3_CH4/LCD_SEG27 LCD SEG21 P2, pin 24
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PC10 USART3_TX/LCD_SEG28 LCD SEG22 P2, pin 15
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/LCD_SEG40/LCD_COM4
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PC11 USART3_RX/LCD_SEG2 LCD SEG23 P2, pin 14
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9/LCD_SEG41/
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LCD_COM5
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PC12 USART3_CK/LCD_SEG3 --- P2, pin 13
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0/LCD_SEG42/
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LCD_COM6
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PC13 RTC_AF1/WKUP2 2 CNT_ IDD CNT_EN P1, pin 4
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EN 4
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PC14 OSC32_IN 3 OSC32_IN OSC32_IN P1, pin 5
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PC15 OSC32_OUT 4 OSC32_OUT OSC32_OUT P1, pin 6
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PD2 TIM3_ETR/LCD_SEG31/ --- P2, pin 12
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LCD_SEG43/LCD_COM7
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===== ===================== ================================ ================
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LEDs
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====
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The STM32L-Discovery board has four LEDs. Two of these are controlled by
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logic on the board and are not available for software control::
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LD1 COM: LD2 default status is red. LD2 turns to green to indicate
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that communications are in progress between the PC and the
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ST-LINK/V2.
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LD2 PWR: Red LED indicates that the board is powered.
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And two LEDs can be controlled by software::
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User LD3: Green LED is a user LED connected to the I/O PB7 of the
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STM32L152 MCU.
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User LD4: Blue LED is a user LED connected to the I/O PB6 of the
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STM32L152 MCU.
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These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
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defined. In that case, the usage by the board port is defined in
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include/board.h and src/stm32_autoleds.c. The LEDs are used to encode
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OS-related events as follows:
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=================== ======================= ======== ========
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SYMBOL Meaning LED3 LED4
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=================== ======================= ======== ========
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LED_STARTED NuttX has been started OFF OFF
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LED_HEAPALLOCATE Heap has been allocated OFF OFF
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LED_IRQSENABLED Interrupts enabled OFF OFF
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LED_STACKCREATED Idle stack created ON OFF
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LED_INIRQ In an interrupt N/C N/C
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LED_SIGNAL In a signal handler N/C N/C
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LED_ASSERTION An assertion failed N/C N/C
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LED_PANIC The system has crashed OFF Blinking
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LED_IDLE STM32 is is sleep mode N/U
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=================== ======================= ======== ========
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Serial Console
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==============
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The STM32L-Discovery has no on-board RS-232 driver. Further, there are no
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USART pins that do not conflict with the on board resources, in particular,
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the LCD: Most USART pins are available if the LCD is enabled; USART2 may
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be used if either the LCD or the on-board LEDs are disabled.
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PA9 USART1_TX LCD glass COM1 P2, pin 22
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PA10 USART1_RX LCD glass COM2 P2, pin 21
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PB6 USART1_TX LED Blue P2, pin 8
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PB7 USART1_RX LED Green P2, pin 7
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PA2 USART2_TX LCD SEG1 P1, pin 17
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PA3 USART2_RX LCD SEG2 P1, pin 18
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PB10 USART3_TX LCD SEG6 P1, pin 22
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PB11 USART3_RX LCD SEG7 P1, pin 23
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PC10 USART3_TX LCD SEG22 P2, pin 15
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PC11 USART3_RX LCD SEG23 P2, pin 14
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NOTES:
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- GND and (external) 5V are available on both P1 and P2. Note: These
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signals may be at lower voltage levels and, hence, may not properly
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drive an external RS-232 transceiver.
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- The crystal X3 is not installed on the STM32L3-Discovery. As a result,
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the HSE clock is not available and the less accurate HSI must be used.
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This may limit the accuracy of the computed baud, especially at higher
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BAUD. The HSI is supposedly calibrated in the factory to within 1% at
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room temperatures so perhaps this not a issue.
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- According to the STM32L-Discovery User Manual, the LCD should be removed
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from its socket if you use any of the LCD pins for any other purpose.
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I have had no problems using the USART1 with PA9 and PA10 with a 3.3-5V
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RS-232 transceiver module at 57600 baud. I have not tried higher baud
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rates.
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- There is no support for a USB serial connector on the STM32L-Discovery
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board. The STM32L152 does support USB, but the USB pins are "free I/O"
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on the board and no USB connector is provided. So the use of a USB
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console is not option. If you need console output, you will need to
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disable either LCD (and use any USART) or the LEDs (and use USART1)
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Debugging
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=========
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If you are going to use a debugger, you should make sure that the following
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settings are selection in your configuration file::
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CONFIG_DEBUG_SYMBOLS=y : Enable debug symbols in the build
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CONFIG_ARMV7M_USEBASEPRI=y : Use the BASEPRI register to disable interrupts
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STM32 ST-LINK Utility
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---------------------
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For simply writing to FLASH, I use the STM32 ST-LINK Utility. At least
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version 2.4.0 is required (older versions do not recognize the STM32 F3
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device). This utility is available from free from the STMicro website.
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OpenOCD
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-------
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I am told that OpenOCD will work with the ST-Link, but I have never tried
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it.
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https://github.com/texane/stlink
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This is an open source server for the ST-Link that I have never used.
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Configurations
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==============
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Each STM32L-Discovery configuration is maintained in a sub-directory and
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can be selected as follow:
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tools/configure.sh STM32L-Discovery:<subdir>
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Where <subdir> is one of the following sub-directories.
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NOTE: These configurations use the mconf-based configuration tool. To
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change any of these configurations using that tool, you should:
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a. Build and install the kconfig-mconf tool. See nuttx/README.txt
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see additional README.txt files in the NuttX tools repository.
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b. Execute 'make menuconfig' in nuttx/ in order to start the
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reconfiguration process.
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Configuration sub-directories
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-----------------------------
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nsh:
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----
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Configures the NuttShell (nsh) located at apps/examples/nsh.
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NOTES:
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1. The serial console is on UART1 and NuttX LED support is enabled.
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Therefore, you will need an external RS232 driver or TTL serial-to-
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USB converter. The UART1 TX and RX pins should be available on
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PA9 and PA10, respectively.
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The serial console is configured for 57600 8N1 by default.
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2. Support for NSH built-in applications is *not* enabled.
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3. By default, this configuration uses the ARM EABI toolchain
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for Windows and builds under Cygwin (or probably MSYS). That
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can easily be reconfigured, of course.
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Build Setup::
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CONFIG_HOST_WINDOWS=y : Builds under Windows
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CONFIG_WINDOWS_CYGWIN=y : Using Cygwin
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System Type::
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CONFIG_ARM_TOOLCHAIN_GNU_EABI=y : GNU EABI toolchain for Windows
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4. SLCD.
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When the LCD is enabled and the LEDs are disabled, the USART1
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serial console will automatically move to PB6 and PB7 (you will get
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a compilation error if you forget to disable the LEDs).
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====== ========== ========== ===========
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SIGNAL FUNCTION LED CONNECTION
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====== ========== ========== ===========
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PB6 USART1_TX LED Blue P2, pin 8
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PB7 USART1_RX LED Green P2, pin 7
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====== ========== ========== ===========
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To enable apps/examples/slcd to test the SLCD:
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Binary Formats::
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CONFIG_BINFMT_DISABLE=n : Don't disable binary support
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CONFIG_BUILTIN=y : Enable support for built-in binaries
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Application Configuration -> NSH Library::
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CONFIG_NSH_BUILTIN_APPS=y : Enable builtin apps in NSH
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CONFIG_NSH_ARCHINIT=y : Needed to initialize the SLCD
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Application Configuration -> Examples::
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CONFIG_EXAMPLES_SLCD=y : Enable apps/examples/slcd
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