cross compiler
note
CROSS_COMPILEis referencing the system toolchain with loose recommendations7.3.1/2Q18 or 8.2.1/4Q18.check the toolchain version
arm-none-eabi-gcc --version
which arm-none-eabi-gcc --versiontesting with version
9-2020-q2-update - 9.3.1 20200408
build instructions
git clone --recurse-submodules https://github.com/micropython/micropython.git
cd micropython/mpy-cross
make
cd ../ports/nrf
make submodules
make BOARD=pca10059 config
usb
each board has the pins configured in a hreader file
ports/nrf/boards/pca10059/mpconfigboard.hUSB CDC activation
UART pin assignement
#define MICROPY_HW_USB_CDC (1)
...
// UART config
#define MICROPY_HW_UART1_RX (13)
#define MICROPY_HW_UART1_TX (15)
#define MICROPY_HW_UART1_CTS (17)
#define MICROPY_HW_UART1_RTS (20)
#define MICROPY_HW_UART1_HWFC (1)
...the UART is used a stdin only if neither of USB nor BLE are enabled such as in
ports/nrf/mphalport.c
#if !MICROPY_PY_BLE_NUS && !MICROPY_HW_USB_CDC
int mp_hal_stdin_rx_chr(void) {
for (;;) {
if (MP_STATE_PORT(board_stdio_uart) != NULL && uart_rx_any(MP_STATE_PORT(board_stdio_uart))) {
return uart_rx_char(MP_STATE_PORT(board_stdio_uart));
... uart
use board
PCA10056note that this board hasMICROPY_HW_USB_CDCnot defined, disabled, set to(0)edit the config file
ports/nrf/boards/pca10056/mpconfigboard.h
// UART config
#define MICROPY_HW_UART1_RX (9)
#define MICROPY_HW_UART1_TX (10)
#define MICROPY_HW_UART1_CTS (7)
#define MICROPY_HW_UART1_RTS (5)
#define MICROPY_HW_UART1_HWFC (0)build
make BOARD=pca10056 Thread Sensortag
config
#define MICROPY_HW_LED1 (4) // LED1
#define MICROPY_HW_LED2 (6) // LED2
#define MICROPY_HW_LED3 (8) // LED3
#define MICROPY_HW_LED4 (1) // LED4
// UART config
#define MICROPY_HW_UART1_RX (2)
#define MICROPY_HW_UART1_TX (29)
#define MICROPY_HW_UART1_CTS (1)
#define MICROPY_HW_UART1_RTS (1)
#define MICROPY_HW_UART1_HWFC (0)
// I2C busses
#define MICROPY_HW_I2C1_NAME "I2C1"
#define MICROPY_HW_I2C1_SCL (45) // SCL
#define MICROPY_HW_I2C1_SDA (47) // SDA
python code
from machine import Pin, I2C
i2c = I2C(0, scl=Pin(45), sda=Pin(47))
i2c.scan() output
[64, 72, 118]