The nRF24L01+ wireless dongle firmware
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gex-nrf-dongle/Src/gex_gateway.c

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3.3 KiB

//
// Created by MightyPork on 2018/03/31.
//
#include <string.h>
#include "debug.h"
#include "msg_queue.h"
#include "gex_gateway.h"
#include "main.h"
#include "minmax.h"
#include "payload_parser.h"
// USB RX
enum URX_STATE {
URXS_IDLE = 0,
URXS_MSG4SLAVE = 1,
};
#define MAX_FRAME_LEN 512
static enum URX_STATE urx_state = URXS_IDLE;
static uint32_t msg4slave_len = 0; // total len to be collected
static uint32_t msg4slave_already = 0; // already collected len
static uint8_t msg4slave[MAX_FRAME_LEN]; // equal buffer size in GEX
static uint8_t msg4slave_addr = 0;
static uint8_t msg4slave_cksum = 0;
#define MAGIC_GW_COMMAND 0x47U // 'G'
enum GW_CMD {
CMD_GET_ID = 'i', // 105
CMD_MSG4SLAVE = 'm', // 109
};
void respond_gw_id() {} // TODO impl
void start_slave_cmd(uint8_t slave_addr, uint16_t frame_len, uint8_t cksum)
{
msg4slave_len = frame_len;
msg4slave_already = 0;
msg4slave_addr = slave_addr;
msg4slave_cksum = cksum;
}
void gw_handle_usb_out(uint8_t *buffer)
{
if (urx_state == URXS_IDLE) {
PayloadParser pp = pp_start(buffer, MQ_SLOT_LEN, NULL);
// handle binary commands for the gateway
// magic twice, one inverted - denotes a gateway command
uint16_t magic1 = pp_u8(&pp);
uint16_t magic2 = pp_u8(&pp);
if (magic1 == MAGIC_GW_COMMAND && magic2 == (0xFFU & (~MAGIC_GW_COMMAND))) {
// third byte is the command code
switch (pp_u8(&pp)) {
case CMD_GET_ID:
respond_gw_id();
break;
case CMD_MSG4SLAVE:;
uint8_t slave_addr = pp_u8(&pp);
uint16_t frame_len = pp_u16(&pp);
uint8_t cksum = pp_u8(&pp);
if (frame_len == 0 || frame_len > MAX_FRAME_LEN) {
dbg("Frame too big!");
break;
}
start_slave_cmd(slave_addr, frame_len, cksum);
dbg("Collecting frame for slave %02x: %d bytes", (int)slave_addr, (int)frame_len);
urx_state = URXS_MSG4SLAVE;
break;
default:
dbg("Bad cmd");
}
} else {
// Bad frame??
dbg("Bad USB frame, starts %x,%x", buffer[0],buffer[1]);
}
}
else if (urx_state == URXS_MSG4SLAVE) {
uint32_t wanted = MIN(msg4slave_len-msg4slave_already, MQ_SLOT_LEN);
memcpy(&msg4slave[msg4slave_already], buffer, wanted);
msg4slave_already += wanted;
if (wanted < MQ_SLOT_LEN) {
// this was the end
uint8_t ck = 0;
for (int i = 0; i < msg4slave_len; i++) {
ck ^= msg4slave[i];
}
ck = ~ck;
if (ck != msg4slave_cksum) {
dbg("Checksum mismatch!");
}
else {
dbg("Verified, sending a %d B frame to slave.", (int) msg4slave_len);
// TODO send to slave
}
urx_state = URXS_IDLE;
}
}
}
/** called from the main loop, periodically */
void gw_process(void)
{
// static uint8_t buffer[MQ_SLOT_LEN];
// while (mq_read(&usb_rxq, buffer)) { // greedy - handle as many as possible
// gw_handle_usb_out(buffer);
// }
}