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raspberrypi/I2CTarget: Fixed bug where I2C starts were seen as restarts. #10474

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raspberrypi/I2CTarget: Fixed bug where I2C starts were seen as restarts. #10474

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15 changes: 15 additions & 0 deletions ports/raspberrypi/common-hal/i2ctarget/I2CTarget.c
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,8 @@ void common_hal_i2ctarget_i2c_target_deinit(i2ctarget_i2c_target_obj_t *self) {
}

int common_hal_i2ctarget_i2c_target_is_addressed(i2ctarget_i2c_target_obj_t *self, uint8_t *address, bool *is_read, bool *is_restart) {
common_hal_i2ctarget_i2c_target_is_stop(self);

if (!((self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_RX_FULL_BITS) || (self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_RD_REQ_BITS))) {
return 0;
}
Expand Down Expand Up @@ -123,6 +125,19 @@ int common_hal_i2ctarget_i2c_target_write_byte(i2ctarget_i2c_target_obj_t *self,
}
}

int common_hal_i2ctarget_i2c_target_is_stop(i2ctarget_i2c_target_obj_t *self) {
// Interrupt bits must be cleared by software. Clear the STOP and
// RESTART interrupt bits after an I2C transaction finishes.
if (self->peripheral->hw->raw_intr_stat & I2C_IC_INTR_STAT_R_STOP_DET_BITS) {
self->peripheral->hw->clr_stop_det;
self->peripheral->hw->clr_restart_det;
return 1;
} else {
return 0;
}

}

void common_hal_i2ctarget_i2c_target_ack(i2ctarget_i2c_target_obj_t *self, bool ack) {
return;
}
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2 changes: 2 additions & 0 deletions ports/raspberrypi/common-hal/i2ctarget/I2CTarget.h
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Original file line number Diff line number Diff line change
Expand Up @@ -21,3 +21,5 @@ typedef struct {
uint8_t scl_pin;
uint8_t sda_pin;
} i2ctarget_i2c_target_obj_t;

int common_hal_i2ctarget_i2c_target_is_stop(i2ctarget_i2c_target_obj_t *self);