STM32F407 usb REPL

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tecdroid
Posts: 10
Joined: Thu Apr 08, 2021 6:22 am

STM32F407 usb REPL

Post by tecdroid » Tue Jun 01, 2021 12:34 pm

Hi,

i got a diymore STM32F4 board which is basically an stm32f407 with almost all ios led to pins and want to build a micropython on it. as far as I know, stm32f407 is basically same as stm32f405 but having ethernet.

I started by copying boards/STM32F4DISC into STM32F407 and compiled this, which seems to work. Now i want to tie REPL to usb and don't know how to configure this and haven't yet found any hint in the other boards..

can someone tell me how to do this?

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dhylands
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Location: Peachland, BC, Canada
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Re: STM32F407 usb REPL

Post by dhylands » Tue Jun 01, 2021 4:50 pm

The REPL on the STM32F4DISC is already setup to goto USB.

Did you adjust the crystal frequency appropriately? The STM32F4DISC has an 8 MHz frequency:
https://github.com/micropython/micropyt ... oard.h#L12

The STM32F4DISC also has VBUS connected to pin A9 so it can do cable detect, and has the ID pin connected to A10.

You need to adjust these:
https://github.com/micropython/micropyt ... .h#L84-L85

to match what you have wired up on your board.

tecdroid
Posts: 10
Joined: Thu Apr 08, 2021 6:22 am

Re: STM32F407 usb REPL

Post by tecdroid » Tue Jun 01, 2021 5:31 pm

according to this schematic diy-more hasn't VBUS and ID pin connected to anything.
I managed to repair this somehow.. somewhere down there is my mpconfigboard.h

So, this config seems to work... Even if I only have 90Kib free space..

Code: Select all

#define MICROPY_HW_BOARD_NAME       "TDDBOARD"
#define MICROPY_HW_MCU_NAME         "STM32F407"

#define MICROPY_HW_HAS_SWITCH       (0)
#define MICROPY_HW_HAS_FLASH        (1)
#define MICROPY_HW_ENABLE_RNG       (1)
#define MICROPY_HW_ENABLE_RTC       (1)
#define MICROPY_HW_ENABLE_DAC       (1)
#define MICROPY_HW_ENABLE_USB       (1)

// HSE is 8MHz
#define MICROPY_HW_CLK_PLLM (8)
#define MICROPY_HW_CLK_PLLN (336)
#define MICROPY_HW_CLK_PLLP (RCC_PLLP_DIV2)
#define MICROPY_HW_CLK_PLLQ (7)

// UART config
#if 1
// A9 is used for USB VBUS detect, and A10 is used for USB_FS_ID.
// UART1 is also on PB6/7 but PB6 is tied to the Audio SCL line.
// Without board modifications, this makes UART1 unusable on this board.
#define MICROPY_HW_UART1_TX     (pin_A9)
#define MICROPY_HW_UART1_RX     (pin_A10)
#endif
#define MICROPY_HW_UART2_TX     (pin_A2)
#define MICROPY_HW_UART2_RX     (pin_A3)
#define MICROPY_HW_UART2_RTS    (pin_A1)
#define MICROPY_HW_UART2_CTS    (pin_A0)
#define MICROPY_HW_UART3_TX     (pin_D8)
#define MICROPY_HW_UART3_RX     (pin_D9)
#define MICROPY_HW_UART3_RTS    (pin_D12)
#define MICROPY_HW_UART3_CTS    (pin_D11)
#if MICROPY_HW_HAS_SWITCH == 0
// NOTE: A0 also connects to the user switch. To use UART4 you should 
//       set MICROPY_HW_HAS_SWITCH to 0, and also remove SB20 (on the back
//       of the board near the USER switch).
#define MICROPY_HW_UART4_TX     (pin_A0)
#define MICROPY_HW_UART4_RX     (pin_A1)
#endif
// NOTE: PC7 is connected to MCLK on the Audio chip. This is an input signal
//       so I think as long as you're not using the audio chip then it should
//       be fine to use as a UART pin.
#define MICROPY_HW_UART6_TX     (pin_C6)
#define MICROPY_HW_UART6_RX     (pin_C7)

// I2C buses
#define MICROPY_HW_I2C1_SCL (pin_B6)
#define MICROPY_HW_I2C1_SDA (pin_B7)
#define MICROPY_HW_I2C2_SCL (pin_B10)
#define MICROPY_HW_I2C2_SDA (pin_B11)

// SPI buses
#define MICROPY_HW_SPI1_NSS  (pin_A4)
#define MICROPY_HW_SPI1_SCK  (pin_A5)
#define MICROPY_HW_SPI1_MISO (pin_A6)
#define MICROPY_HW_SPI1_MOSI (pin_A7)
#define MICROPY_HW_SPI2_NSS  (pin_B12)
#define MICROPY_HW_SPI2_SCK  (pin_B13)
#define MICROPY_HW_SPI2_MISO (pin_B14)
#define MICROPY_HW_SPI2_MOSI (pin_B15)

// CAN buses
#define MICROPY_HW_CAN1_TX (pin_B9)
#define MICROPY_HW_CAN1_RX (pin_B8)
#define MICROPY_HW_CAN2_TX (pin_B13)
#define MICROPY_HW_CAN2_RX (pin_B12)

// USRSW is pulled low. Pressing the button makes the input go high.
#define MICROPY_HW_USRSW_PIN        (pin_A0)
#define MICROPY_HW_USRSW_PULL       (GPIO_NOPULL)
#define MICROPY_HW_USRSW_EXTI_MODE  (GPIO_MODE_IT_RISING)
#define MICROPY_HW_USRSW_PRESSED    (1)

// LEDs
/*
 * #define MICROPY_HW_LED1             (pin_D14) // red
#define MICROPY_HW_LED2             (pin_D12) // green
#define MICROPY_HW_LED3             (pin_D13) // orange
#define MICROPY_HW_LED4             (pin_D15) // blue
#define MICROPY_HW_LED_ON(pin)      (mp_hal_pin_high(pin))
#define MICROPY_HW_LED_OFF(pin)     (mp_hal_pin_low(pin))
*/

// USB config
#define MICROPY_HW_USB_FS              (1)
//#define MICROPY_HW_USB_VBUS_DETECT_PIN (pin_A9)
//#define MICROPY_HW_USB_OTG_ID_PIN      (pin_A10)

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