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