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Merge pull request #5174 from tannewt/fix_rpi_i2c_check

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Fix RP2040 I2C instance check
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Dan Halbert 2021-08-18 18:12:47 -04:00 committed by GitHub
commit af2f8df52a
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1 changed files with 4 additions and 3 deletions
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7
ports/raspberrypi/common-hal/busio/I2C.c
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@ -59,9 +59,10 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
self->peripheral = NULL;
// I2C pins have a regular pattern. SCL is always odd and SDA is even. They match up in pairs
// so we can divide by two to get the instance. This pattern repeats.
if (scl->number % 2 == 1 && sda->number % 2 == 0 && scl->number / 2 == sda->number / 2) {
size_t instance = (scl->number / 2) % 2;
self->peripheral = i2c[instance];
size_t scl_instance = (scl->number / 2) % 2;
size_t sda_instance = (sda->number / 2) % 2;
if (scl->number % 2 == 1 && sda->number % 2 == 0 && scl_instance == sda_instance) {
self->peripheral = i2c[sda_instance];
}
if (self->peripheral == NULL) {
mp_raise_ValueError(translate("Invalid pins"));