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Merge pull request #2498 from dhalbert/optional-i2c-pullup-checking

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Make requiring I2C pullups be optional
This commit is contained in:
Scott Shawcroft 2020-01-10 11:42:44 -08:00 committed by GitHub
commit 6ea8d8a6c2
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4 changed files with 14 additions and 0 deletions
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3
ports/atmel-samd/common-hal/busio/I2C.c
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@ -76,6 +76,7 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
mp_raise_ValueError(translate("Invalid pins"));
}
#if CIRCUITPY_REQUIRE_I2C_PULLUPS
// Test that the pins are in a high state. (Hopefully indicating they are pulled up.)
gpio_set_pin_function(sda->number, GPIO_PIN_FUNCTION_OFF);
gpio_set_pin_function(scl->number, GPIO_PIN_FUNCTION_OFF);
@ -98,6 +99,8 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
reset_pin_number(scl->number);
mp_raise_RuntimeError(translate("SDA or SCL needs a pull up"));
}
#endif
gpio_set_pin_function(sda->number, sda_pinmux);
gpio_set_pin_function(scl->number, scl_pinmux);

2
ports/mimxrt10xx/common-hal/busio/I2C.c
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@ -98,11 +98,13 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
LPI2C_MasterInit(self->i2c, &config, I2C_CLOCK_FREQ);
#if CIRCUITPY_REQUIRE_I2C_PULLUPS
// if (!gpio_get_pin_level(sda->number) || !gpio_get_pin_level(scl->number)) {
// reset_pin_number(sda->number);
// reset_pin_number(scl->number);
// mp_raise_RuntimeError(translate("SDA or SCL needs a pull up"));
// }
#endif
claim_pin(self->sda_pin->pin);
claim_pin(self->scl_pin->pin);

2
ports/nrf/common-hal/busio/I2C.c
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@ -115,6 +115,7 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self, const mcu_pin_obj_t *
mp_raise_ValueError(translate("All I2C peripherals are in use"));
}
#if CIRCUITPY_REQUIRE_I2C_PULLUPS
// Test that the pins are in a high state. (Hopefully indicating they are pulled up.)
nrf_gpio_cfg_input(scl->number, NRF_GPIO_PIN_PULLDOWN);
nrf_gpio_cfg_input(sda->number, NRF_GPIO_PIN_PULLDOWN);
@ -132,6 +133,7 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self, const mcu_pin_obj_t *
reset_pin_number(scl->number);
mp_raise_RuntimeError(translate("SDA or SCL needs a pull up"));
}
#endif
nrfx_twim_config_t config = NRFX_TWIM_DEFAULT_CONFIG(scl->number, sda->number);

7
py/circuitpy_mpconfig.mk
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@ -310,6 +310,13 @@ CIRCUITPY_BITBANG_APA102 = 0
endif
CFLAGS += -DCIRCUITPY_BITBANG_APA102=$(CIRCUITPY_BITBANG_APA102)
# Should busio.I2C() check for pullups?
# Some boards in combination with certain peripherals may not want this.
ifndef CIRCUITPY_REQUIRE_I2C_PULLUPS
CIRCUITPY_REQUIRE_I2C_PULLUPS = 1
endif
CFLAGS += -DCIRCUITPY_REQUIRE_I2C_PULLUPS=$(CIRCUITPY_REQUIRE_I2C_PULLUPS)
# REPL over BLE
ifndef CIRCUITPY_SERIAL_BLE
CIRCUITPY_SERIAL_BLE = 0