Matteus Car / Lora_SX1272_serial

Debug Serial para programa resetar o buffer quando houver tamanhos errados na mensagem

Dependencies:   pulga-lorawan-drv PingPong-P2P-ClickButtonToWork-SX1272

serial.cpp@7:37dc9ce68914, 2021-03-19 (annotated)

Committer:
pancotinho
Date:
Fri Mar 19 20:26:32 2021 +0000
Revision:
7:37dc9ce68914
Child:
12:d0ca7c3c8962
changes for serial comm

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pancotinho 7:37dc9ce68914 1 #include "serial.h"
pancotinho 7:37dc9ce68914 2
pancotinho 7:37dc9ce68914 3 RawSerial pc(P0_28, P0_25);
pancotinho 7:37dc9ce68914 4
pancotinho 7:37dc9ce68914 5 static char circ_buffer[512];
pancotinho 7:37dc9ce68914 6 static int rd_index = 0;
pancotinho 7:37dc9ce68914 7 static int wr_index = 0;
pancotinho 7:37dc9ce68914 8 static int buf_len = 0;
pancotinho 7:37dc9ce68914 9
pancotinho 7:37dc9ce68914 10 void SerialRx(void)
pancotinho 7:37dc9ce68914 11 {
pancotinho 7:37dc9ce68914 12 char msg[256];
pancotinho 7:37dc9ce68914 13 int msg_incompleta;
pancotinho 7:37dc9ce68914 14 int msg_len;
pancotinho 7:37dc9ce68914 15 int i, j;
pancotinho 7:37dc9ce68914 16
pancotinho 7:37dc9ce68914 17 /// Execucao do comando nao deve fazer parte da recepcao de dados serial!
pancotinho 7:37dc9ce68914 18 /// Deve existir separacao entre camada fisica, protocolo de baixo nivel
pancotinho 7:37dc9ce68914 19 /// e de alto nivel.
pancotinho 7:37dc9ce68914 20
pancotinho 7:37dc9ce68914 21 /// 1) Vamos implementar a parte de recepcao serial com buffer circular.
pancotinho 7:37dc9ce68914 22 /// 2) Vamos implementar rejeicao de ruido.
pancotinho 7:37dc9ce68914 23 /// 3) Interpretamos, executamos ou descartamos comandos.
pancotinho 7:37dc9ce68914 24
pancotinho 7:37dc9ce68914 25 /// Recepcao serial
pancotinho 7:37dc9ce68914 26 while(pc.readable())
pancotinho 7:37dc9ce68914 27 {
pancotinho 7:37dc9ce68914 28 /// buffer circular cheio entao sai do loop
pancotinho 7:37dc9ce68914 29 if (buf_len >= sizeof(circ_buffer)) {
pancotinho 7:37dc9ce68914 30 break;
pancotinho 7:37dc9ce68914 31 }
pancotinho 7:37dc9ce68914 32 circ_buffer[wr_index] = pc.getc();
pancotinho 7:37dc9ce68914 33
pancotinho 7:37dc9ce68914 34 buf_len++;
pancotinho 7:37dc9ce68914 35 wr_index++;
pancotinho 7:37dc9ce68914 36
pancotinho 7:37dc9ce68914 37 if (wr_index >= sizeof(circ_buffer)) {
pancotinho 7:37dc9ce68914 38 wr_index = 0;
pancotinho 7:37dc9ce68914 39 }
pancotinho 7:37dc9ce68914 40 }
pancotinho 7:37dc9ce68914 41
pancotinho 7:37dc9ce68914 42 /// Vamos retirar todos os caracteres invalidos antes do comando
pancotinho 7:37dc9ce68914 43 /// Um comando sempre inicia com '<'
pancotinho 7:37dc9ce68914 44 while(buf_len > 0)
pancotinho 7:37dc9ce68914 45 {
pancotinho 7:37dc9ce68914 46 if (circ_buffer[rd_index] == '<') {
pancotinho 7:37dc9ce68914 47 break; /// rd_index fica com o indice do inicio da mensagem
pancotinho 7:37dc9ce68914 48 }
pancotinho 7:37dc9ce68914 49
pancotinho 7:37dc9ce68914 50 buf_len--;
pancotinho 7:37dc9ce68914 51 rd_index++;
pancotinho 7:37dc9ce68914 52
pancotinho 7:37dc9ce68914 53 if (rd_index >= sizeof(circ_buffer)) {
pancotinho 7:37dc9ce68914 54 rd_index = 0;
pancotinho 7:37dc9ce68914 55 }
pancotinho 7:37dc9ce68914 56 }
pancotinho 7:37dc9ce68914 57
pancotinho 7:37dc9ce68914 58 /// Se ficou vazio, tudo era ruido, limpa todas as variaveis globais e sai
pancotinho 7:37dc9ce68914 59 if (buf_len <= 0)
pancotinho 7:37dc9ce68914 60 {
pancotinho 7:37dc9ce68914 61 //printf("ruido\n");
pancotinho 7:37dc9ce68914 62 rd_index = 0;
pancotinho 7:37dc9ce68914 63 wr_index = 0;
pancotinho 7:37dc9ce68914 64 buf_len = 0;
pancotinho 7:37dc9ce68914 65 pc.attach(&serial_post_to_queue, RawSerial::RxIrq);
pancotinho 7:37dc9ce68914 66 return;
pancotinho 7:37dc9ce68914 67 }
pancotinho 7:37dc9ce68914 68
pancotinho 7:37dc9ce68914 69 /// Agora vamos verificar se a mensagem esta completa.
pancotinho 7:37dc9ce68914 70 /// Procura o final (terminada em '>').
pancotinho 7:37dc9ce68914 71 /// Nao altero rd_index!!
pancotinho 7:37dc9ce68914 72 i = 0;
pancotinho 7:37dc9ce68914 73 j = rd_index;
pancotinho 7:37dc9ce68914 74 msg_incompleta = 1;
pancotinho 7:37dc9ce68914 75
pancotinho 7:37dc9ce68914 76 while (i < buf_len)
pancotinho 7:37dc9ce68914 77 {
pancotinho 7:37dc9ce68914 78 if (circ_buffer[j] == '>')
pancotinho 7:37dc9ce68914 79 {
pancotinho 7:37dc9ce68914 80 ///encontrou final de cmd
pancotinho 7:37dc9ce68914 81 msg_incompleta = 0;
pancotinho 7:37dc9ce68914 82 break;
pancotinho 7:37dc9ce68914 83 }
pancotinho 7:37dc9ce68914 84 j++;
pancotinho 7:37dc9ce68914 85 i++;
pancotinho 7:37dc9ce68914 86
pancotinho 7:37dc9ce68914 87 if (j >= sizeof(circ_buffer)) {
pancotinho 7:37dc9ce68914 88 j = 0;
pancotinho 7:37dc9ce68914 89 }
pancotinho 7:37dc9ce68914 90 }
pancotinho 7:37dc9ce68914 91
pancotinho 7:37dc9ce68914 92 /// Se a mensagem esta incompleta, deixa para a proxima vez.
pancotinho 7:37dc9ce68914 93 /// Mas aqui tem uma sacada, se o buffer circular estiver cheio,
pancotinho 7:37dc9ce68914 94 /// nunca receberei o final... Entao o codigo nao receberia nunca mais.
pancotinho 7:37dc9ce68914 95 /// Para evitar o travamento permanente, limpa tudo nesse caso.
pancotinho 7:37dc9ce68914 96 /// <------------ Isso causava o erro !!!!!!
pancotinho 7:37dc9ce68914 97 if (msg_incompleta)
pancotinho 7:37dc9ce68914 98 {
pancotinho 7:37dc9ce68914 99 if (buf_len >= sizeof(circ_buffer))
pancotinho 7:37dc9ce68914 100 {
pancotinho 7:37dc9ce68914 101 rd_index = 0;
pancotinho 7:37dc9ce68914 102 wr_index = 0;
pancotinho 7:37dc9ce68914 103 buf_len = 0;
pancotinho 7:37dc9ce68914 104 }
pancotinho 7:37dc9ce68914 105 pc.attach(&serial_post_to_queue, RawSerial::RxIrq);
pancotinho 7:37dc9ce68914 106 return;
pancotinho 7:37dc9ce68914 107 }
pancotinho 7:37dc9ce68914 108
pancotinho 7:37dc9ce68914 109 /// Finalmente copio a msg
pancotinho 7:37dc9ce68914 110 msg_len = 0;
pancotinho 7:37dc9ce68914 111 while(buf_len > 0)
pancotinho 7:37dc9ce68914 112 {
pancotinho 7:37dc9ce68914 113 if (msg_len < sizeof(msg))
pancotinho 7:37dc9ce68914 114 {
pancotinho 7:37dc9ce68914 115 msg[msg_len] = circ_buffer[rd_index];
pancotinho 7:37dc9ce68914 116 msg_len++;
pancotinho 7:37dc9ce68914 117 }
pancotinho 7:37dc9ce68914 118 else
pancotinho 7:37dc9ce68914 119 {
pancotinho 7:37dc9ce68914 120 /// A mensagem esta errada, grande demais.
pancotinho 7:37dc9ce68914 121 msg_len = 0;
pancotinho 7:37dc9ce68914 122 break;
pancotinho 7:37dc9ce68914 123 }
pancotinho 7:37dc9ce68914 124
pancotinho 7:37dc9ce68914 125 if (circ_buffer[rd_index] == '>')
pancotinho 7:37dc9ce68914 126 {
pancotinho 7:37dc9ce68914 127 ///encontrou final de cmd
pancotinho 7:37dc9ce68914 128 break;
pancotinho 7:37dc9ce68914 129 }
pancotinho 7:37dc9ce68914 130
pancotinho 7:37dc9ce68914 131 buf_len--;
pancotinho 7:37dc9ce68914 132 rd_index++;
pancotinho 7:37dc9ce68914 133
pancotinho 7:37dc9ce68914 134 if (rd_index >= sizeof(circ_buffer)) {
pancotinho 7:37dc9ce68914 135 rd_index = 0;
pancotinho 7:37dc9ce68914 136 }
pancotinho 7:37dc9ce68914 137 }
pancotinho 7:37dc9ce68914 138
pancotinho 7:37dc9ce68914 139 /// Agora posso limpar todo o buffer circular
pancotinho 7:37dc9ce68914 140 rd_index = 0;
pancotinho 7:37dc9ce68914 141 wr_index = 0;
pancotinho 7:37dc9ce68914 142 buf_len = 0;
pancotinho 7:37dc9ce68914 143
pancotinho 7:37dc9ce68914 144 /// A mensagem foi truncada entao sai.
pancotinho 7:37dc9ce68914 145 if (msg_len == 0) {
pancotinho 7:37dc9ce68914 146 pc.attach(&serial_post_to_queue, RawSerial::RxIrq);
pancotinho 7:37dc9ce68914 147 return;
pancotinho 7:37dc9ce68914 148 }
pancotinho 7:37dc9ce68914 149
pancotinho 7:37dc9ce68914 150 /// Troco o '>' do final por null
pancotinho 7:37dc9ce68914 151 msg[msg_len - 1] = '\0';
pancotinho 7:37dc9ce68914 152
pancotinho 7:37dc9ce68914 153 SerialCommandRun(msg);
pancotinho 7:37dc9ce68914 154
pancotinho 7:37dc9ce68914 155 pc.attach(&serial_post_to_queue, RawSerial::RxIrq);
pancotinho 7:37dc9ce68914 156 return;
pancotinho 7:37dc9ce68914 157 }
pancotinho 7:37dc9ce68914 158
pancotinho 7:37dc9ce68914 159
pancotinho 7:37dc9ce68914 160 void PrintDebugMsg(char *msg){
pancotinho 7:37dc9ce68914 161 pc.printf(msg);
pancotinho 7:37dc9ce68914 162 }