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works on nearly all sensors

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This commit is contained in:
Dan Halbert 2021-03-02 23:18:01 -05:00
parent f31b472309
commit e3ab394cd6
1 changed files with 16 additions and 12 deletions
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28
ports/raspberrypi/common-hal/busio/I2C.c
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@ -98,18 +98,20 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
// Create a bitbangio.I2C object to do short writes.
// Must be done before setting up the I2C pins, since they will be
// set up as GPIO by the bitbangio.I2C object.
//
// Sets pins to open drain, high, and input.
shared_module_bitbangio_i2c_construct(&self->bitbangio_i2c, scl, sda,
frequency, timeout);
gpio_set_function(sda->number, GPIO_FUNC_I2C);
gpio_set_function(scl->number, GPIO_FUNC_I2C);
self->baudrate = i2c_init(self->peripheral, frequency);
self->sda_pin = sda->number;
self->scl_pin = scl->number;
claim_pin(sda);
self->sda_pin = sda->number;
claim_pin(scl);
claim_pin(sda);
gpio_set_function(self->scl_pin, GPIO_FUNC_I2C);
gpio_set_function(self->sda_pin, GPIO_FUNC_I2C);
}
bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
@ -154,21 +156,23 @@ void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
const uint8_t *data, size_t len, bool transmit_stop_bit) {
if (len <= 2) {
// Use a bitbangio.I2C to do the write.
// The RP2040 I2C peripheral will not do writes 2 bytes or less long.
// So use bitbangio.I2C to do the write.
gpio_set_function(self->sda_pin, GPIO_FUNC_SIO);
gpio_set_function(self->scl_pin, GPIO_FUNC_SIO);
gpio_set_dir(self->sda_pin, GPIO_IN);
gpio_put(self->sda_pin, true);
gpio_set_function(self->sda_pin, GPIO_FUNC_SIO);
gpio_set_dir(self->scl_pin, GPIO_IN);
gpio_put(self->scl_pin, true);
gpio_set_dir(self->sda_pin, GPIO_IN);
gpio_put(self->scl_pin, false);
gpio_put(self->sda_pin, false);
uint8_t status = shared_module_bitbangio_i2c_write(&self->bitbangio_i2c,
addr, data, len, transmit_stop_bit);
mp_hal_delay_us(20);
gpio_set_function(self->sda_pin, GPIO_FUNC_I2C);
// The pins must be set back to GPIO_FUNC_I2C in the order given here,
// SCL first, otherwise reads will hang.
gpio_set_function(self->scl_pin, GPIO_FUNC_I2C);
gpio_set_function(self->sda_pin, GPIO_FUNC_I2C);
return status;
}