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RangeFinder: benewake buffer uses uint8_t

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This commit is contained in:
Randy Mackay 2018-11-19 10:31:24 +09:00
parent 4b1857b3aa
commit f5a9fdaf42
2 changed files with 8 additions and 4 deletions
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10
libraries/AP_RangeFinder/AP_RangeFinder_Benewake.cpp
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@ -85,7 +85,11 @@ bool AP_RangeFinder_Benewake::get_reading(uint16_t &reading_cm)
// read any available lines from the lidar
int16_t nbytes = uart->available();
while (nbytes-- > 0) {
char c = uart->read();
int16_t r = uart->read();
if (r < 0) {
continue;
}
uint8_t c = (uint8_t)r;
// if buffer is empty and this byte is 0x59, add to buffer
if (linebuf_len == 0) {
if (c == BENEWAKE_FRAME_HEADER) {
@ -107,10 +111,10 @@ bool AP_RangeFinder_Benewake::get_reading(uint16_t &reading_cm)
// calculate checksum
uint8_t checksum = 0;
for (uint8_t i=0; i<BENEWAKE_FRAME_LENGTH-1; i++) {
checksum += (uint8_t)linebuf[i];
checksum += linebuf[i];
}
// if checksum matches extract contents
if (checksum == (uint8_t)linebuf[BENEWAKE_FRAME_LENGTH-1]) {
if (checksum == linebuf[BENEWAKE_FRAME_LENGTH-1]) {
// calculate distance
uint16_t dist = ((uint16_t)linebuf[3] << 8) | linebuf[2];
if (dist >= BENEWAKE_DIST_MAX_CM) {

2
libraries/AP_RangeFinder/AP_RangeFinder_Benewake.h
View File

@ -39,6 +39,6 @@ private:
AP_HAL::UARTDriver *uart = nullptr;
benewake_model_type model_type;
char linebuf[10];
uint8_t linebuf[10];
uint8_t linebuf_len;
};