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refactor: Modbus 缓冲大小用宏替换硬编码 250

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- rs485_modbus.h: +MB_MAX_READ_REGS(125) / MB_MAX_DATA_BYTES(250) / MB_RESP_BUF_SIZE(255)
- rs485_modbus.c: data_buf[250]→data_buf[MB_MAX_DATA_BYTES]
                   buf[5+250]  →buf[MB_RESP_BUF_SIZE]
                   quantity>125→quantity>MB_MAX_READ_REGS
This commit is contained in:
wangfq
2026-07-30 15:28:11 +08:00
parent c7176b93f2
commit df6e38f118
2 changed files with 11 additions and 6 deletions
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BLE/DLD154Pro_Peripheral_28K/APP/include/rs485_modbus.h
+5
View File
@@ -36,6 +36,11 @@
* addr(1) + fc(1) + byte_cnt(1) + data(38) + crc(2) = 43 */
#define MB_FULL_DATA_FRAME_LEN 43
/* FC 0x03/0x04 读寄存器缓冲 (Modbus 标准: max qty = 0x007D = 125) */
#define MB_MAX_READ_REGS 125 /* 单次读取最大寄存器数 */
#define MB_MAX_DATA_BYTES 250 /* 125 × 2 字节 */
#define MB_RESP_BUF_SIZE (5 + MB_MAX_DATA_BYTES) /* addr+fc+bc+data+crc */
/*===========================================================================
* API
*===========================================================================*/
BLE/DLD154Pro_Peripheral_28K/APP/rs485_modbus.c
+6 -6
View File
@@ -463,12 +463,12 @@ static void handle_read_input_regs(const uint8_t *rx, uint8_t rx_len)
uint16_t start_addr = ((uint16_t)rx[2] << 8) | rx[3];
uint16_t quantity = ((uint16_t)rx[4] << 8) | rx[5];
if (quantity == 0 || quantity > 125) {
if (quantity == 0 || quantity > MB_MAX_READ_REGS) {
send_exception(0x04, 0x03);
return;
}
uint8_t data_buf[250];
uint8_t data_buf[MB_MAX_DATA_BYTES];
uint16_t reg_addr;
for (uint16_t i = 0; i < quantity; i++) {
@@ -483,7 +483,7 @@ static void handle_read_input_regs(const uint8_t *rx, uint8_t rx_len)
}
uint8_t byte_cnt = (uint8_t)(quantity * 2);
uint8_t buf[5 + 250]; /* addr + fc + bc + data + crc */
uint8_t buf[MB_RESP_BUF_SIZE];
uint16_t crc;
buf[0] = g_rs485_id & 0xFF;
@@ -543,12 +543,12 @@ static void handle_read_holding_regs(const uint8_t *rx, uint8_t rx_len)
uint16_t start_addr = ((uint16_t)rx[2] << 8) | rx[3];
uint16_t quantity = ((uint16_t)rx[4] << 8) | rx[5];
if (quantity == 0 || quantity > 125) {
if (quantity == 0 || quantity > MB_MAX_READ_REGS) {
send_exception(0x03, 0x03);
return;
}
uint8_t data_buf[250];
uint8_t data_buf[MB_MAX_DATA_BYTES];
for (uint16_t i = 0; i < quantity; i++) {
uint16_t reg_addr = start_addr + i;
@@ -562,7 +562,7 @@ static void handle_read_holding_regs(const uint8_t *rx, uint8_t rx_len)
}
uint8_t byte_cnt = (uint8_t)(quantity * 2);
uint8_t buf[5 + 250];
uint8_t buf[MB_RESP_BUF_SIZE];
uint16_t crc;
buf[0] = g_rs485_id & 0xFF;