580 lines
22 KiB
Plaintext
580 lines
22 KiB
Plaintext
README
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======
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This README 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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Contents
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========
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- Status
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- GPIO Pin Usage
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- LEDs
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- Serial Console
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- Debugging
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- STM32L-Discovery-specific Configuration Options
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- Configurations
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Status
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======
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The basic port is complete. A NuttShell (NSH) configuration exists for the
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STM32L-Discovery board. A driver has been developed for the segment LCD on
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board the STM32L-Discovery. In the NSH configuration discription below,
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there is information about how the basic NSH extension can be extended to
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use apps/examples/slcd to exercise the segment LCD.
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* The following subsystem have header files, drivers and have been
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exercised: PWR, RCC, GPIO, SYSCFG, LCD, USART.
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* The following subsystenms have header files and ported drivers, but are
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untested: DMA
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* The following subystems have counterparts with other STM32 parts, but
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have not been ported or verified: ADC, DAC, TIM2-15, TIM9-11, RTC,
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IWDG, WWDG, I2C, SPI, DBG. These may be close to functional depending
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upon how close the IP is on the STM32L15X.
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This might include also USB, FSMC, and SDIO.
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* The following subsystems are unique to the STM32L and have not been
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developed: COMP, TSIO, RI, OPAMP
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* The STM32L15X does support USB, however, USB is not available on the
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STM32L-Discovery board.
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* These subystems are available on other STM32L15x/16x parts, but not on
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the part used in the STM32L-Discovery board: CRC, AES, FSMC, SDIO
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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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----- --------------------- -------------------------------- ----------------
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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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----- --------------------- -------------------------------- ----------------
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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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----- --------------------- -------------------------------- ----------------
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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/up_leds.c. The LEDs are used to encode OS-related
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events as follows:
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SYMBOL Meaning LED state
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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 No change
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LED_SIGNAL In a signal handler No change
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LED_ASSERTION An assertion failed No change
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LED_PANIC The system has crashed OFF Blinking
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LED_IDLE STM32 is is sleep mode Not used
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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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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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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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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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--------------------------------
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This is an open source server for the ST-Link that I have never used.
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Atollic GDB Server
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------------------
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You can use the Atollic IDE, but I have never done that either.
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STM32L-Discovery-specific Configuration Options
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===============================================
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CONFIG_ARCH - Identifies the arch/ subdirectory. This should
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be set to:
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CONFIG_ARCH=arm
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CONFIG_ARCH_family - For use in C code:
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CONFIG_ARCH_ARM=y
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CONFIG_ARCH_architecture - For use in C code:
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CONFIG_ARCH_CORTEXM4=y
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CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
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CONFIG_ARCH_CHIP=stm32
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CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
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chip:
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CONFIG_ARCH_CHIP_STM32L152RB=y
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CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG - Enables special STM32 clock
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configuration features.
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CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG=n
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CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
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hence, the board that supports the particular chip or SoC.
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CONFIG_ARCH_BOARD=stm32fldiscovery (for the STM32L-Discovery development board)
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CONFIG_ARCH_BOARD_name - For use in C code
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CONFIG_ARCH_BOARD_STM32FLDISCOVERY=y
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CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
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of delay loops
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CONFIG_ENDIAN_BIG - define if big endian (default is little
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endian)
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CONFIG_RAM_SIZE - Describes the installed DRAM (SRAM in this case):
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CONFIG_RAM_SIZE=16384 (16Kb)
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CONFIG_RAM_START - The start address of installed DRAM
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CONFIG_RAM_START=0x20000000
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CONFIG_STM32_CCMEXCLUDE - Exclude CCM SRAM from the HEAP
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CONFIG_ARCH_FPU - The STM32L-Discovery does not support a floating point unit (FPU)
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CONFIG_ARCH_FPU=n
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CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
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have LEDs
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CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
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stack. If defined, this symbol is the size of the interrupt
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stack in bytes. If not defined, the user task stacks will be
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used during interrupt handling.
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CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
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CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to board architecture.
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CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
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cause a 100 second delay during boot-up. This 100 second delay
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serves no purpose other than it allows you to calibrate
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CONFIG_ARCH_LOOPSPERMSEC. You simply use a stop watch to measure
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the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
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the delay actually is 100 seconds.
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Individual subsystems can be enabled:
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AHB
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----
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(GPIOs are always enabled)
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CONFIG_STM32_FLITF
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CONFIG_STM32_DMA1
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CONFIG_STM32_DMA2
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APB2
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----
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CONFIG_STM32_SYSCFG
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CONFIG_STM32_TIM9
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CONFIG_STM32_TIM10
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CONFIG_STM32_TIM11
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CONFIG_STM32_ADC1
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CONFIG_STM32_SPI1
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CONFIG_STM32_USART1
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APB1
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----
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CONFIG_STM32_TIM2
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CONFIG_STM32_TIM3
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CONFIG_STM32_TIM4
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CONFIG_STM32_TIM5
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CONFIG_STM32_TIM6
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CONFIG_STM32_TIM7
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CONFIG_STM32_LCD
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CONFIG_STM32_WWDG
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CONFIG_STM32_IWDG
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CONFIG_STM32_SPI2
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CONFIG_STM32_SPI3
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CONFIG_STM32_USART2
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CONFIG_STM32_USART3
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CONFIG_STM32_I2C1
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CONFIG_STM32_I2C2
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CONFIG_STM32_USB
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CONFIG_STM32_PWR -- Required for RTC
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CONFIG_STM32_DAC1
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CONFIG_STM32_COMP
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Timer devices may be used for different purposes. One special purpose is
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to generate modulated outputs for such things as motor control. If CONFIG_STM32_TIMn
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is defined (as above) then the following may also be defined to indicate that
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the timer is intended to be used for pulsed output modulation, ADC conversion,
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or DAC conversion. Note that ADC/DAC require two definition: Not only do you have
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to assign the timer (n) for used by the ADC or DAC, but then you also have to
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configure which ADC or DAC (m) it is assigned to.
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CONFIG_STM32_TIMn_PWM Reserve timer n for use by PWM, n=1,..,14
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CONFIG_STM32_TIMn_ADC Reserve timer n for use by ADC, n=1,..,14
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CONFIG_STM32_TIMn_ADCm Reserve timer n to trigger ADCm, n=1,..,14, m=1,..,3
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CONFIG_STM32_TIMn_DAC Reserve timer n for use by DAC, n=1,..,14
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CONFIG_STM32_TIMn_DACm Reserve timer n to trigger DACm, n=1,..,14, m=1,..,2
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For each timer that is enabled for PWM usage, we need the following additional
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configuration settings:
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CONFIG_STM32_TIMx_CHANNEL - Specifies the timer output channel {1,..,4}
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NOTE: The STM32 timers are each capable of generating different signals on
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each of the four channels with different duty cycles. That capability is
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not supported by this driver: Only one output channel per timer.
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JTAG Enable settings (by default only SW-DP is enabled):
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CONFIG_STM32_JTAG_FULL_ENABLE - Enables full SWJ (JTAG-DP + SW-DP)
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CONFIG_STM32_JTAG_NOJNTRST_ENABLE - Enables full SWJ (JTAG-DP + SW-DP)
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but without JNTRST.
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CONFIG_STM32_JTAG_SW_ENABLE - Set JTAG-DP disabled and SW-DP enabled
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STM32L-Discovery specific device driver settings
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CONFIG_U[S]ARTn_SERIAL_CONSOLE - selects the USARTn (n=1,2,3) or UART
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m (m=4,5) for the console and ttys0 (default is the USART1).
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CONFIG_U[S]ARTn_RXBUFSIZE - Characters are buffered as received.
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This specific the size of the receive buffer
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CONFIG_U[S]ARTn_TXBUFSIZE - Characters are buffered before
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being sent. This specific the size of the transmit buffer
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CONFIG_U[S]ARTn_BAUD - The configure BAUD of the UART. Must be
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CONFIG_U[S]ARTn_BITS - The number of bits. Must be either 7 or 8.
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CONFIG_U[S]ARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
|
|
CONFIG_U[S]ARTn_2STOP - Two stop bits
|
|
|
|
STM32L-Discovery CAN Configuration
|
|
|
|
CONFIG_CAN - Enables CAN support (one or both of CONFIG_STM32_CAN1 or
|
|
CONFIG_STM32_CAN2 must also be defined)
|
|
CONFIG_CAN_EXTID - Enables support for the 29-bit extended ID. Default
|
|
Standard 11-bit IDs.
|
|
CONFIG_CAN_FIFOSIZE - The size of the circular buffer of CAN messages.
|
|
Default: 8
|
|
CONFIG_CAN_NPENDINGRTR - The size of the list of pending RTR requests.
|
|
Default: 4
|
|
CONFIG_CAN_LOOPBACK - A CAN driver may or may not support a loopback
|
|
mode for testing. The STM32 CAN driver does support loopback mode.
|
|
CONFIG_STM32_CAN1_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN1
|
|
is defined.
|
|
CONFIG_STM32_CAN2_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN2
|
|
is defined.
|
|
CONFIG_CAN_TSEG1 - The number of CAN time quanta in segment 1. Default: 6
|
|
CONFIG_CAN_TSEG2 - the number of CAN time quanta in segment 2. Default: 7
|
|
CONFIG_STM32_CAN_REGDEBUG - If CONFIG_DEBUG_FEATURES is set, this will generate an
|
|
dump of all CAN registers.
|
|
|
|
STM32L-Discovery SPI Configuration
|
|
|
|
CONFIG_STM32_SPI_INTERRUPTS - Select to enable interrupt driven SPI
|
|
support. Non-interrupt-driven, poll-waiting is recommended if the
|
|
interrupt rate would be to high in the interrupt driven case.
|
|
CONFIG_STM32_SPI_DMA - Use DMA to improve SPI transfer performance.
|
|
Cannot be used with CONFIG_STM32_SPI_INTERRUPT.
|
|
|
|
Configurations
|
|
==============
|
|
|
|
Each STM32L-Discovery configuration is maintained in a sub-directory and
|
|
can be selected as follow:
|
|
|
|
tools/configure.sh STM32L-Discovery/<subdir>
|
|
|
|
Where <subdir> is one of the following sub-directories.
|
|
|
|
NOTE: These configurations use the mconf-based configuration tool. To
|
|
change any of these configurations using that tool, you should:
|
|
|
|
a. Build and install the kconfig-mconf tool. See nuttx/README.txt
|
|
see additional README.txt files in the NuttX tools repository.
|
|
|
|
b. Execute 'make menuconfig' in nuttx/ in order to start the
|
|
reconfiguration process.
|
|
|
|
Configuration sub-directories
|
|
-----------------------------
|
|
|
|
nsh:
|
|
---
|
|
Configures the NuttShell (nsh) located at apps/examples/nsh.
|
|
|
|
NOTES:
|
|
|
|
1. The serial console is on UART1 and NuttX LED support is enabled.
|
|
Therefore, you will need an external RS232 driver or TTL serial-to-
|
|
USB converter. The UART1 TX and RX pins should be available on
|
|
PA9 and PA10, respectively.
|
|
|
|
The serial console is configured for 57600 8N1 by default.
|
|
|
|
2. Support for NSH built-in applications is *not* enabled.
|
|
|
|
3. By default, this configuration uses the CodeSourcery toolchain
|
|
for Windows and builds under Cygwin (or probably MSYS). That
|
|
can easily be reconfigured, of course.
|
|
|
|
Build Setup:
|
|
CONFIG_HOST_WINDOWS=y : Builds under Windows
|
|
CONFIG_WINDOWS_CYGWIN=y : Using Cygwin
|
|
|
|
System Type:
|
|
CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery for Windows
|
|
|
|
4. To enable SLCD support:
|
|
|
|
Board Selection:
|
|
CONFIG_ARCH_LEDS=n : Disable board LED support
|
|
|
|
Library Routines:
|
|
CONFIG_LIB_SLCDCODEC=y : Enable the SLCD CODEC
|
|
|
|
System Type -> STM32 Peripheral Support:
|
|
CONFIG_STM32_LCD=y : Enable the Segment LCD
|
|
|
|
When the LCD is enabled and the LEDs are disabled, the USART1
|
|
serial console will automatically move to PB6 and PB7 (you will get
|
|
a compilation error if you forget to disable the LEDs).
|
|
|
|
SIGNAL FUNCTION LED CONNECTION
|
|
------ ---------- ---------- -----------
|
|
PB6 USART1_TX LED Blue P2, pin 8
|
|
PB7 USART1_RX LED Green P2, pin 7
|
|
|
|
To enable apps/examples/slcd to test the SLCD:
|
|
|
|
Binary Formats:
|
|
CONFIG_BINFMT_DISABLE=n : Don't disable binary support
|
|
CONFIG_BUILTIN=y : Enable support for built-in binaries
|
|
|
|
Application Configuration -> NSH Library:
|
|
CONFIG_NSH_BUILTIN_APPS=y : Enable builtin apps in NSH
|
|
CONFIG_NSH_ARCHINIT=y : Needed to initialize the SLCD
|
|
|
|
Application Configuration -> Examples:
|
|
CONFIG_EXAMPLES_SLCD=y : Enable apps/examples/slcd
|
|
|
|
To enable LCD debug output:
|
|
|
|
Device Drivers:
|
|
CONFIG_LCD=y : (Needed to enable LCD debug)
|
|
|
|
Build Setup -> Debug Options:
|
|
CONFIG_DEBUG_FEATURES=y : Enable debug features
|
|
CONFIG_DEBUG_INFO=y : Enable LCD debug
|
|
|
|
NOTE: At this point in time, testing of the SLCD is very limited because
|
|
there is not much in apps/examples/slcd. Certainly there are more bugs
|
|
to be found. There are also many segment-encoded glyphs in stm32_lcd.c
|
|
But there is a basically functional driver with a working test setup
|
|
that can be extended if you want a fully functional SLCD driver.
|