diff --git a/components/driver/test/test_rs485.c b/components/driver/test/test_rs485.c
index f7fe61df51..b716d18da3 100644
--- a/components/driver/test/test_rs485.c
+++ b/components/driver/test/test_rs485.c
@@ -5,7 +5,6 @@
  */
 /* This file is from test_uart.c, but mainly about RS485 */
 
-
 #include <string.h>
 #include <sys/param.h>
 #include "unity.h"
@@ -14,22 +13,17 @@
 #include "esp_log.h"
 #include "esp_random.h"             // for uint32_t esp_random()
 
-#define UART_TAG         "Uart"
-#define UART_NUM1        (UART_NUM_1)
-#define BUF_SIZE         (100)
-#define UART1_RX_PIN     (22)
-#define UART1_TX_PIN     (23)
-#define UART_BAUD_11520  (11520)
-#define UART_BAUD_115200 (115200)
-#define TOLERANCE        (0.02)    //baud rate error tolerance 2%.
-
-#define UART_TOLERANCE_CHECK(val, uper_limit, lower_limit)   ( (val) <= (uper_limit) && (val) >= (lower_limit) )
+#define UART_NUM1       (UART_NUM_1)
+#define UART_BAUD_RATE  (115200 * 10)
+#define BUF_SIZE        (512)
+#define UART1_RX_PIN    (22)
+#define UART1_TX_PIN    (23)
 
 // RTS for RS485 Half-Duplex Mode manages DE/~RE
-#define UART1_RTS_PIN    (18)
+#define UART1_RTS_PIN   (18)
 
 // Number of packets to be send during test
-#define PACKETS_NUMBER  (10)
+#define PACKETS_NUMBER  (40)
 
 // Wait timeout for uart driver
 #define PACKET_READ_TICS    (1000 / portTICK_PERIOD_MS)
@@ -158,7 +152,7 @@ static uint16_t buffer_fill_random(uint8_t *buffer, size_t length)
 static void rs485_init(void)
 {
     uart_config_t uart_config = {
-        .baud_rate = UART_BAUD_115200,
+        .baud_rate = UART_BAUD_RATE,
         .data_bits = UART_DATA_8_BITS,
         .parity = UART_PARITY_DISABLE,
         .stop_bits = UART_STOP_BITS_1,
@@ -210,7 +204,7 @@ static void rs485_slave(void)
     unity_wait_for_signal("Master_started");
     for(int pack_count = 0; pack_count < PACKETS_NUMBER; pack_count++) {
         //Read slave_data from UART
-        int len = uart_read_bytes(UART_NUM1, slave_data, BUF_SIZE, (PACKET_READ_TICS * 2));
+        int len = uart_read_bytes(UART_NUM1, slave_data, BUF_SIZE, PACKET_READ_TICS);
         //Write slave_data back to UART
         if (len > 2) {
             esp_err_t status = print_packet_data("Received ", slave_data, len);
@@ -259,7 +253,7 @@ static void rs485_master(void)
         uart_write_bytes(UART_NUM1, (char*)master_buffer, BUF_SIZE);
         uart_wait_tx_idle_polling(UART_NUM1);
         // Read translated packet from slave
-        int len = uart_read_bytes(UART_NUM1, slave_buffer, BUF_SIZE, (PACKET_READ_TICS * 2));
+        int len = uart_read_bytes(UART_NUM1, slave_buffer, BUF_SIZE, PACKET_READ_TICS);
         // Check if the received packet is too short
         if (len > 2) {
             // Print received packet and check checksum
@@ -280,6 +274,7 @@ static void rs485_master(void)
     uart_wait_tx_done(UART_NUM1, PACKET_READ_TICS);
     // Free the buffer and delete driver at the end
     free(master_buffer);
+    free(slave_buffer);
     uart_driver_delete(UART_NUM1);
     TEST_ASSERT(err_count <= 1);
     printf("Test completed. Received packets = %d, errors = %d\r\n", (uint16_t)good_count, (uint16_t)err_count);