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fix(lp_i2c): Fixed a bug where LP I2C write got stuck

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This commit fixes a bug where an I2C write got stuck when using the
lp_core_i2c_master_write_read_device() API. This was because the LP I2C
HW was not programmed with an END condition and therefore did not know
the end of a transaction.

Closes: https://github.com/espressif/esp-idf/issues/11958
This commit is contained in:
Sudeep Mohanty
2023-08-07 09:59:28 +02:00
committed by BOT
parent ee8adce5ea
commit a9ef76b031
1 changed files with 3 additions and 5 deletions
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8
components/ulp/lp_core/lp_core/lp_core_i2c.c
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@ -382,11 +382,9 @@ esp_err_t lp_core_i2c_master_write_read_device(i2c_port_t lp_i2c_num, uint16_t d
i2c_ll_write_txfifo(dev, &data_wr[data_idx], fifo_size);
lp_core_i2c_format_cmd(cmd_idx++, I2C_LL_CMD_WRITE, 0, LP_I2C_ACK, s_ack_check_en, fifo_size);
if (remaining_bytes) {
/* This means we have to send more than what can fit in the Tx FIFO. Insert an End command. */
lp_core_i2c_format_cmd(cmd_idx++, I2C_LL_CMD_END, 0, 0, 0, 0);
cmd_idx = 0;
}
/* Insert an End command to signal the end of the write transaction to the HW */
lp_core_i2c_format_cmd(cmd_idx++, I2C_LL_CMD_END, 0, 0, 0, 0);
cmd_idx = 0;
/* Initiate I2C transfer */
i2c_ll_update(dev);