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fix(i2c): Fix i2c customize only read one byte issue

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This commit is contained in:
C.S.M
2025-03-31 16:47:07 +08:00
parent 96244e0849
commit 3158443b03
3 changed files with 105 additions and 2 deletions
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13
components/esp_driver_i2c/i2c_master.c
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@@ -294,6 +294,13 @@ static bool s_i2c_read_command(i2c_master_bus_handle_t i2c_master, i2c_operation
i2c_master->read_buf_pos = i2c_master->trans_idx;
} else {
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
// If the read position has not been marked, that means the transaction doesn't contain read-ack
// operation, then mark the read position in read-nack operation.
// i2c_master->read_buf_pos will never be 0.
if (i2c_master->read_buf_pos == 0) {
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_master->read_len_static = i2c_master->rx_cnt;
}
i2c_master->cmd_idx++;
}
i2c_master->trans_idx++;
@@ -610,6 +617,7 @@ static esp_err_t s_i2c_transaction_start(i2c_master_dev_handle_t i2c_dev, int xf
i2c_master->cmd_idx = 0;
i2c_master->rx_cnt = 0;
i2c_master->read_len_static = 0;
i2c_master->read_buf_pos = 0;
I2C_CLOCK_SRC_ATOMIC() {
i2c_hal_set_bus_timing(hal, i2c_dev->scl_speed_hz, i2c_master->base->clk_src, i2c_master->base->clk_src_freq_hz);
@@ -673,7 +681,10 @@ I2C_MASTER_ISR_ATTR static void i2c_isr_receive_handler(i2c_master_bus_t *i2c_ma
i2c_operation_t *i2c_operation = &i2c_master->i2c_trans.ops[i2c_master->read_buf_pos];
portENTER_CRITICAL_ISR(&i2c_master->base->spinlock);
i2c_ll_read_rxfifo(hal->dev, i2c_operation->data + i2c_operation->bytes_used, i2c_master->read_len_static);
i2c_ll_read_rxfifo(hal->dev, i2c_master->i2c_trans.ops[i2c_master->read_buf_pos + 1].data, 1);
// If the read command only contain nack marker, no read it for the second time.
if (i2c_master->i2c_trans.ops[i2c_master->read_buf_pos + 1].data) {
i2c_ll_read_rxfifo(hal->dev, i2c_master->i2c_trans.ops[i2c_master->read_buf_pos + 1].data, 1);
}
i2c_master->w_r_size = i2c_master->read_len_static + 1;
i2c_master->contains_read = false;
portEXIT_CRITICAL_ISR(&i2c_master->base->spinlock);