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proto(V1.05): variation 由 2B无符号 扩展为 3B有符号

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背景: variation 是遥测量, 用于离线跟踪分析车检器算法。原 2B 无符号
存在两个缺陷: (1)CAPVD域量级~131072, 大车全覆盖时偏差可超65535而回绕,
污染数据; (2)绝对值丢失方向, 分不清'车进入'与'反向漂移'。

改动 (三端联动, 同版本发布):
- 协议 DLD960Loop_串口通信协议.md: 变化量 2B->3B有符号补码, 定义
  variation=Origin-CAPVD (正=车/裕量, 负=反向漂移); 每单元11->12B,
  Len 47->51; 补符号扩展说明; 示例报文重算(XOR=FE SUM=38); 修订记录V1.05
- vd960Loop main.c: 组包 uint32->int32, Origin-CAPVD, 3B LE, +-2^23饱和防回绕
- vd960DBN loop_uart_proto.h: variation uint16->int32
- vd960DBN loop_uart_proto.c: 步长11->12, data_len/11->/12, misc偏移右移1B,
  variation 3B解码+bit23符号扩展
- vd960DBN iot_mqtt_srv.c: fast_mode 阈值判断改 abs(variation)>=10, 正负变化都加速

验证: 本地 gcc 隔离单测 编解码往返/符号扩展/饱和/方向语义/fast_mode 全通过;
大车 diff=100000 旧版回绕34464 新版正确保留。字节账: 帧56B < Loop缓冲64B
< DBN缓冲512B < MSS576, 均不溢出。整体固件编译需在 Keil/MounRiver 侧完成。
This commit is contained in:
wangfq
2026-07-14 14:47:39 +08:00
parent db52f92348
commit bfc9646e48
5 changed files with 46 additions and 27 deletions
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vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/loop_uart_proto.c
+16 -10
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@@ -376,12 +376,12 @@ int lup_parse_set_param_resp(const uint8_t *pkg, uint16_t len, uint8_t *success)
/*
* Parse 0xC0/0x0C — 多路线圈传感信息
*
* 每路线圈数据单元 = 11 bytes:
* 每路线圈数据单元 = 12 bytes (V1.05):
* [0] 配置1: freq_level(2) | Direction(1) | freq_type(1) | sens(4)
* [1] 评估条件: condition(4) | loop_state(1) | car_state(1) | misc_type(2)
* [2-4] 频率 (3 bytes, LE)
* [5-6] 变化量 (2 bytes, LE)
* [7-10] 杂项 (4 bytes)
* [2-4] 频率 (3 bytes, LE, 无符号)
* [5-7] 变化量 (3 bytes, LE, 有符号补码, = Origin - CAPVD)
* [8-11] 杂项 (4 bytes)
*/
int lup_parse_sensor_report(const uint8_t *pkg, uint16_t len, LUP_SensorReport *report)
{
@@ -397,17 +397,17 @@ int lup_parse_sensor_report(const uint8_t *pkg, uint16_t len, LUP_SensorReport *
report->sub_amount = (sub_pkg >> 4) & 0x0F;
report->sub_sequence = sub_pkg & 0x0F;
// 计算线圈数: Value = sensType(1) + SubPkgFlag(1) + coil_count * 11
// 计算线圈数: Value = sensType(1) + SubPkgFlag(1) + coil_count * 12
uint16_t val_len = pkg[2]; // LEN field
uint16_t data_offset = 6; // 跳过 7F + Addr + LEN + CMD + SensType + SubPkgFlag
uint16_t data_len = val_len - 2; // 减去 SensType + SubPkgFlag
uint8_t coil_count = data_len / 11;
uint8_t coil_count = data_len / 12;
if (coil_count > LUP_COIL_COUNT) coil_count = LUP_COIL_COUNT;
report->coil_count = coil_count;
for (i = 0; i < coil_count; i++) {
const uint8_t *c = pkg + data_offset + i * 11;
const uint8_t *c = pkg + data_offset + i * 12;
LUP_CoilSensor *cs = &report->coils[i];
cs->freq_level = (c[0] >> 6) & 0x03;
@@ -421,9 +421,15 @@ int lup_parse_sensor_report(const uint8_t *pkg, uint16_t len, LUP_SensorReport *
cs->misc_type = c[1] & 0x03;
cs->freq = c[2] | ((uint32_t)c[3] << 8) | ((uint32_t)c[4] << 16);
cs->variation = c[5] | ((uint16_t)c[6] << 8);
cs->misc.passtime_ms = c[7] | ((uint32_t)c[8] << 8)
| ((uint32_t)c[9] << 16) | ((uint32_t)c[10] << 24);
// 变化量 3B 有符号 (LE) — 读入后须符号扩展 bit23
{
int32_t v = c[5] | ((int32_t)c[6] << 8) | ((int32_t)c[7] << 16);
if (v & 0x800000) v |= (int32_t)0xFF000000;
cs->variation = v;
}
cs->misc.passtime_ms = c[8] | ((uint32_t)c[9] << 8)
| ((uint32_t)c[10] << 16) | ((uint32_t)c[11] << 24);
}
return 0;