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fix(i2c_master): Fix that master multi-read failed,

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Closes https://github.com/espressif/esp-idf/issues/16231
This commit is contained in:
C.S.M
2025-07-03 12:19:04 +08:00
parent 9820fd1d9f
commit 0e44dcf2ff
2 changed files with 69 additions and 15 deletions
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61
components/esp_driver_i2c/i2c_master.c
View File

@@ -7,6 +7,7 @@
#include <string.h>
#include <sys/param.h>
#include <sys/lock.h>
#include "esp_rom_sys.h"
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_attr.h"
@@ -291,14 +292,62 @@ static bool s_i2c_read_command(i2c_master_bus_handle_t i2c_master, i2c_operation
i2c_master->contains_read = true;
#if !SOC_I2C_STOP_INDEPENDENT
/*
* If the remaining bytes is less than the hardware fifo length - 1,
* it means the read command can be sent out in one time.
* So, we set the status to I2C_STATUS_READ_ALL.
*/
if (remaining_bytes < I2C_FIFO_LEN(i2c_master->base->port_num) - 1) {
atomic_store(&i2c_master->status, I2C_STATUS_READ_ALL);
if (i2c_operation->hw_cmd.ack_val == I2C_ACK_VAL) {
if (remaining_bytes != 0) {
// If the next transaction is a read command, and the ack value is I2C_ACK_VAL,
// that means we have multi read jobs. We send out this read command first.
// Otherwise, we can mix with other commands, like stop.
i2c_operation_t next_transaction = i2c_master->i2c_trans.ops[i2c_master->trans_idx + 1];
if (next_transaction.hw_cmd.op_code == I2C_LL_CMD_READ && next_transaction.hw_cmd.ack_val == I2C_ACK_VAL) {
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_master->read_len_static = i2c_master->rx_cnt;
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
i2c_master->cmd_idx = 0;
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
portEXIT_CRITICAL_SAFE(&handle->spinlock);
if (i2c_master->async_trans == false) {
i2c_hal_master_trans_start(hal);
} else {
i2c_master->async_break = true;
}
} else {
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_master->read_len_static = i2c_master->rx_cnt;
i2c_master->cmd_idx++;
}
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
portEXIT_CRITICAL_SAFE(&handle->spinlock);
if (i2c_master->async_trans == false) {
if (xPortInIsrContext()) {
xSemaphoreGiveFromISR(i2c_master->cmd_semphr, do_yield);
} else {
xSemaphoreGive(i2c_master->cmd_semphr);
}
}
}
} else {
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
if (i2c_master->async_trans == false) {
if (xPortInIsrContext()) {
xSemaphoreGiveFromISR(i2c_master->cmd_semphr, do_yield);
} else {
xSemaphoreGive(i2c_master->cmd_semphr);
}
}
}
} 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
@@ -309,7 +358,6 @@ static bool s_i2c_read_command(i2c_master_bus_handle_t i2c_master, i2c_operation
i2c_master->read_len_static = i2c_master->rx_cnt;
}
i2c_master->cmd_idx++;
}
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
if (i2c_master->async_trans == false) {
@@ -319,9 +367,11 @@ static bool s_i2c_read_command(i2c_master_bus_handle_t i2c_master, i2c_operation
xSemaphoreGive(i2c_master->cmd_semphr);
}
}
}
} else {
atomic_store(&i2c_master->status, I2C_STATUS_READ);
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
if (i2c_master->async_trans == false) {
@@ -342,6 +392,7 @@ static bool s_i2c_read_command(i2c_master_bus_handle_t i2c_master, i2c_operation
i2c_master->i2c_trans.cmd_count--;
}
}
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
portEXIT_CRITICAL_SAFE(&handle->spinlock);
@@ -672,7 +723,7 @@ I2C_MASTER_ISR_ATTR static void i2c_isr_receive_handler(i2c_master_bus_t *i2c_ma
i2c_hal_context_t *hal = &i2c_master->base->hal;
if (atomic_load(&i2c_master->status) == I2C_STATUS_READ) {
i2c_operation_t *i2c_operation = &i2c_master->i2c_trans.ops[i2c_master->trans_idx];
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->rx_cnt);
/* rx_cnt bytes have just been read, increment the number of bytes used from the buffer */
@@ -686,6 +737,7 @@ I2C_MASTER_ISR_ATTR static void i2c_isr_receive_handler(i2c_master_bus_t *i2c_ma
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_master->trans_idx++;
i2c_operation->bytes_used = 0;
i2c_master->read_len_static = 0;
}
portEXIT_CRITICAL_ISR(&i2c_master->base->spinlock);
}
@@ -695,10 +747,11 @@ I2C_MASTER_ISR_ATTR static void i2c_isr_receive_handler(i2c_master_bus_t *i2c_ma
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);
// 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) {
if (i2c_master->i2c_trans.ops[i2c_master->read_buf_pos + 1].data && i2c_master->i2c_trans.ops[i2c_master->read_buf_pos + 1].hw_cmd.ack_val == I2C_NACK_VAL) {
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->read_len_static = 0;
i2c_master->contains_read = false;
portEXIT_CRITICAL_ISR(&i2c_master->base->spinlock);
}

3
components/esp_driver_i2c/include/driver/i2c_types.h
View File

@@ -25,7 +25,8 @@ typedef int i2c_port_num_t;
* @brief Enumeration for I2C fsm status.
*/
typedef enum {
I2C_STATUS_READ, /*!< read status for current master command */
I2C_STATUS_READ, /*!< read status for current master command, but just partial read, not all data is read is this status */
I2C_STATUS_READ_ALL, /*!< read status for current master command, all data is read is this status */
I2C_STATUS_WRITE, /*!< write status for current master command */
I2C_STATUS_START, /*!< Start status for current master command */
I2C_STATUS_STOP, /*!< stop status for current master command */