dennisgunia/split-flap-controller
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fix protocol V2 bug

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This commit is contained in:
Dennis Gunia
2025-10-19 16:33:46 +02:00
parent 439b8d09ae
commit 0557c43016
4 changed files with 116 additions and 12 deletions
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13
software/firmware_module/module_rev0/src/main.c
View File

@@ -13,6 +13,8 @@
uint16_t address = 0x0000;
uint16_t calib_offset = 0x0000;
char *payload;
void eeprom_write_c(uint16_t address, uint8_t data)
{
@@ -60,11 +62,10 @@ void initialSetup()
void readCommand()
{
char *payload = malloc(PROTO_MAXPKGLEN);
uint8_t payload_len = sfbus_recv_frame_v2(address, payload);
payload += 2; // skip address bytes
if (payload_len > 0)
int payload_len = parse_buffer(address, payload);
if (payload_len > 0) // if positive, package is valid
{
payload += 2; // skip address bytes
// read command byte
uint8_t opcode = *payload;
// parse commands
@@ -166,14 +167,16 @@ void readCommand()
_delay_ms(2);
sfbus_send_frame_v2(0xFFFF, &msg, 1);
}
//memset(payload, 0x00, PROTO_MAXPKGLEN); // clear buffer
}
free(payload);
}
int main()
{
payload = malloc(PROTO_MAXPKGLEN);
initialSetup();
rs485_init();
setup_async_rx();
mctrl_init(calib_offset);
while (1 == 1)

101
software/firmware_module/module_rev0/src/rs458.c
View File

@@ -61,9 +61,9 @@ int rs485_recv_c_rxout(uint8_t timeout, char *data)
// SFBUS Functions
// receive paket with crc checking and timeout
uint8_t sfbus_recv_frame_v2(uint16_t address, char *payload)
int sfbus_recv_frame_v2(uint16_t address, char *payload)
{
const uint8_t RX_TIMEOUT = 2;
const uint8_t RX_TIMEOUT = 4;
while (rs485_recv_c() != SFBUS_SOF_BYTE)
{
} // Wait for start byte
@@ -97,7 +97,7 @@ uint8_t sfbus_recv_frame_v2(uint16_t address, char *payload)
return (checksum == checksum_calc && address == recv_addr) ? frm_length : 0;
}
// send paket with crc
// send paket with crc
void sfbus_send_frame_v2(uint16_t address, char *payload, uint8_t length)
{
uint8_t framelen = length;
@@ -146,4 +146,99 @@ uint16_t calc_CRC16(char *buffer, uint8_t len)
}
}
return crc16;
}
// async receive function
uint8_t rx_buffer_ix_ptr = 0; // receive buffer index pointer
uint8_t rx_buffer_ix_rem = 255; // receive buffer remaining
uint8_t rx_buffer_rx_done = 0; // receive buffer complete flag (must be reset before next pkg can be received)
uint8_t *rx_buffer_temp; // receive buffer
// setup async receive function
void setup_async_rx()
{
rx_buffer_temp = malloc(PROTO_MAXPKGLEN); // reserve memory for rx buffer
UCSRB |= (1 << RXCIE); //enable rx interrupt
}
ISR(USART_RXC_vect)
{
if (rx_buffer_rx_done == 0) // only receive when last buffer was processed
{
uint8_t rx_byte = UDR; // read rx buffer
if (timer_ticks > 6) // too long since last byte
{
rx_buffer_ix_ptr = 0; // reset pointer and start new transaction
rx_buffer_ix_rem = 255; // reset remaining bytes to default
}
if (rx_buffer_ix_ptr == 0)
{
// wait for startbyte
if (rx_byte == SFBUS_SOF_BYTE)
{
*(rx_buffer_temp) = rx_byte;
rx_buffer_ix_ptr++;
}
}
else if (rx_buffer_ix_ptr > 0 && rx_buffer_ix_ptr < (PROTO_MAXPKGLEN - 1)) // when package is already started
{ // and buffer is smaller than max length
*(rx_buffer_temp + rx_buffer_ix_ptr) = rx_byte; // receive single byte
rx_buffer_ix_rem--;
rx_buffer_ix_ptr++;
if (rx_buffer_ix_ptr == 3) // third byte is always frame length
{
rx_buffer_ix_rem = rx_byte;
}
if (rx_buffer_ix_rem == 0) // when last byte is received
{
rx_buffer_ix_ptr--;
rx_buffer_rx_done = 1;
}
}
timer_ticks = 0; // reset timer ticks
}
}
int parse_buffer(uint16_t address, char *payload)
{
if (rx_buffer_rx_done > 0)
{
uint8_t frm_length = *(rx_buffer_temp + 2);
// check protocol version
if (*(rx_buffer_temp + 1) != 0x01)
{
clear_buffer();
return -1; // abort on incompatible version
}
if (frm_length < PROTO_MAXPKGLEN) // prevent buffer overflow
{
memcpy(payload, rx_buffer_temp + 3, frm_length); // copy buffer
// if version matches, read address and checksum
uint16_t recv_addr = (*(rx_buffer_temp + 3) & 0xFF) | ((*(rx_buffer_temp + 4) & 0xFF) << SHIFT_1B);
uint16_t checksum = (*(rx_buffer_temp + (rx_buffer_ix_ptr - 1)) & 0xFF) |
((*(rx_buffer_temp + (rx_buffer_ix_ptr)) & 0xFF) << SHIFT_1B);
// calculate checksum of received payload
uint16_t checksum_calc = calc_CRC16((char *)rx_buffer_temp + 5, rx_buffer_ix_ptr - 6);
//mctrl_set(address == recv_addr ? 20 : recv_addr + 1, 0);
clear_buffer();
// return length on valid address and crc, return 0 to ignore
return (checksum == checksum_calc && address == recv_addr) ? frm_length : 0;
}
else
{
// invalid package
clear_buffer();
return -1;
}
}
return -2;
}
void clear_buffer()
{
rx_buffer_ix_ptr = 0; // reset pointer and start new transaction
rx_buffer_ix_rem = PROTO_MAXPKGLEN; // reset remaining bytes to default
rx_buffer_rx_done = 0; // reset done flag
//memset(rx_buffer_temp, 0x00, PROTO_MAXPKGLEN); // clear buffer
}

5
software/firmware_module/module_rev0/src/rs485.h
View File

@@ -26,10 +26,13 @@ extern "C"
char rs485_recv_c(void);
int rs485_recv_c_rxout(uint8_t timeout, char *data);
uint8_t sfbus_recv_frame_v2(uint16_t address, char *payload);
int sfbus_recv_frame_v2(uint16_t address, char *payload);
void sfbus_send_frame_v2(uint16_t address, char *payload, uint8_t length);
uint16_t calc_CRC16(char *buffer, uint8_t len);
void setup_async_rx();
int parse_buffer(uint16_t address, char *payload);
void clear_buffer();
// auxilary var for uart timeout
extern uint16_t timer_ticks;