Diff: cell_modem.cpp

Revision:

61:f6b93129f954

Child:

63:90d7c69993cd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cell_modem.cpp	Mon Aug 01 18:29:04 2016 +0000
@@ -0,0 +1,319 @@
+#include "mbed.h"
+#include <cctype>
+#include <string>
+#include "SerialBuffered.h"
+
+#include "config_me.h"
+#include "wnc_control.h"
+#include "hardware.h"
+
+#define MDM_DBG_OFF                             0
+#define MDM_DBG_AT_CMDS                         (1 << 0)
+int mdm_dbgmask = MDM_DBG_OFF;
+
+#define WNC_WAIT_FOR_AT_CMD_MS 40
+
+DigitalOut  mdm_uart2_rx_boot_mode_sel(PTC17);  // on powerup, 0 = boot mode, 1 = normal boot
+DigitalOut  mdm_power_on(PTB9);                 // 0 = turn modem on, 1 = turn modem off (should be held high for >5 seconds to cycle modem)
+DigitalOut  mdm_wakeup_in(PTC2);                // 0 = let modem sleep, 1 = keep modem awake -- Note: pulled high on shield
+
+DigitalOut  mdm_reset(PTC12);                   // active high      
+
+DigitalOut  shield_3v3_1v8_sig_trans_ena(PTC4); // 0 = disabled (all signals high impedence, 1 = translation active
+DigitalOut  mdm_uart1_cts(PTD0);
+
+#define TOUPPER(a) (a) //toupper(a)
+
+const char ok_str[] = "OK";
+const char error_str[] = "ERROR";
+
+#define MDM_OK                                  0
+#define MDM_ERR_TIMEOUT                         -1
+
+#define MAX_AT_RSP_LEN                          255
+
+ssize_t mdm_getline(char *buff, size_t size, int timeout_ms) {
+    int cin = -1;
+    int cin_last;
+    
+    if (NULL == buff || size == 0) {
+        return -1;
+    }
+
+    size_t len = 0;
+    Timer timer;
+    timer.start();
+    while ((len < (size-1)) && (timer.read_ms() < timeout_ms)) {
+        if (mdm.readable()) {
+            cin_last = cin;
+            cin = mdm.getc();
+            if (isprint(cin)) {
+                buff[len++] = (char)cin;
+                continue;
+            } else if (('\r' == cin_last) && ('\n' == cin)) {
+                break;
+            }
+        }
+//        wait_ms(1);
+    }
+    buff[len] = (char)NULL;
+    
+    return len;
+}
+
+int mdm_sendAtCmd(const char *cmd, const char **rsp_list, int timeout_ms) {
+    // Per WNC wait:
+    wait_ms(WNC_WAIT_FOR_AT_CMD_MS);
+
+    if (cmd && strlen(cmd) > 0) {
+        if (mdm_dbgmask & MDM_DBG_AT_CMDS) {
+            printf(MAG "ATCMD: " DEF "--> " GRN "%s" DEF "\n", cmd);
+        }
+        mdm.puts(cmd);
+        mdm.puts("\r\n");
+    }
+
+    if (rsp_list) {
+        Timer   timer;
+        char    rsp[MAX_AT_RSP_LEN+1];
+        int     len;
+        
+        timer.start();
+        while (timer.read_ms() < timeout_ms) {
+            len = mdm_getline(rsp, sizeof(rsp), timeout_ms - timer.read_ms());
+            
+            if (len < 0)
+                return MDM_ERR_TIMEOUT;
+
+            if (len == 0)
+                continue;
+                
+            if (mdm_dbgmask & MDM_DBG_AT_CMDS) {
+                printf(MAG "ATRSP: " DEF "<-- " CYN "%s" DEF "\n", rsp);
+            }
+        
+            if (rsp_list) {
+                int rsp_idx = 0;
+                while (rsp_list[rsp_idx]) {
+                    if (strcasecmp(rsp, rsp_list[rsp_idx]) == 0) {
+                        return rsp_idx;
+                    }
+                    rsp_idx++;
+                }
+            }
+        }
+        return MDM_ERR_TIMEOUT;
+    }
+    return MDM_OK;
+}
+
+int mdm_init(void) {
+    // Hard reset the modem (doesn't go through
+    // the signal level translator)
+    mdm_reset = 0;
+
+    // disable signal level translator (necessary
+    // for the modem to boot properly).  All signals
+    // except mdm_reset go through the level translator
+    // and have internal pull-up/down in the module. While
+    // the level translator is disabled, these pins will
+    // be in the correct state.  
+    shield_3v3_1v8_sig_trans_ena = 0;
+
+    // While the level translator is disabled and ouptut pins
+    // are tristated, make sure the inputs are in the same state
+    // as the WNC Module pins so that when the level translator is
+    // enabled, there are no differences.
+    mdm_uart2_rx_boot_mode_sel = 1;   // UART2_RX should be high
+    mdm_power_on = 0;                 // powr_on should be low
+    mdm_wakeup_in = 1;                // wake-up should be high
+    mdm_uart1_cts = 0;                // indicate that it is ok to send
+
+   // Now, wait for the WNC Module to perform its initial boot correctly
+    wait(1.0);
+  
+    // The WNC module initializes comms at 115200 8N1 so set it up
+     mdm.baud(115200);
+    
+    //Now, enable the level translator, the input pins should now be the
+    //same as how the M14A module is driving them with internal pull ups/downs.
+    //When enabled, there will be no changes in these 4 pins...
+    shield_3v3_1v8_sig_trans_ena = 1;
+
+    // Now, give the modem 60 seconds to start responding by
+    // sending simple 'AT' commands to modem once per second.
+    Timer timer;
+    timer.start();
+    while (timer.read() < 60) {
+        const char * rsp_lst[] = { ok_str, error_str, NULL };
+        int rc = mdm_sendAtCmd("AT", rsp_lst, 500);
+        if (rc == 0)
+            return true; //timer.read();
+        wait_ms(1000 - (timer.read_ms() % 1000));
+        pc.printf("\r%d",timer.read_ms()/1000);
+    }
+    return false;       
+}
+
+int mdm_sendAtCmdRsp(const char *cmd, const char **rsp_list, int timeout_ms, string * rsp, int * len) {
+    static char cmd_buf[3200];  // Need enough room for the WNC sockreads (over 3000 chars)
+    size_t n = strlen(cmd);
+
+    // Per WNC wait:
+    wait_ms(WNC_WAIT_FOR_AT_CMD_MS);
+
+    if (cmd && n > 0) {
+        if (mdm_dbgmask & MDM_DBG_AT_CMDS) {
+            printf(MAG "ATCMD: " DEF "--> " GRN "%s" DEF "\n", cmd);
+        }
+//        mdm.puts(cmd);
+//        mdm.puts("\r\n");
+        while (n--) {
+            mdm.putc(*cmd++);
+            wait_us(1000);
+        };
+        mdm.putc('\r');
+        wait_us(1000);
+        mdm.putc('\n');
+        wait_us(1000);
+    }
+
+    if (rsp_list) {
+        rsp->erase(); // Clean up from prior cmd response
+        *len = 0;
+        Timer   timer;
+        timer.start();
+        while (timer.read_ms() < timeout_ms) {
+            int lenCmd = mdm_getline(cmd_buf, sizeof(cmd_buf), timeout_ms - timer.read_ms());
+
+            if (lenCmd == 0)
+                continue;
+
+            if (lenCmd < 0)
+                return MDM_ERR_TIMEOUT;
+            else {
+                *len += lenCmd;
+                *rsp += cmd_buf;
+            }
+
+            if (mdm_dbgmask & MDM_DBG_AT_CMDS) {
+                printf(MAG "ATRSP: " DEF "<-- " CYN "%s" DEF "\n", cmd_buf);
+            }
+
+            int rsp_idx = 0;
+            while (rsp_list[rsp_idx]) {
+                if (strcasecmp(cmd_buf, rsp_list[rsp_idx]) == 0) {
+                    return rsp_idx;
+                }
+                rsp_idx++;
+            }
+        }
+        return MDM_ERR_TIMEOUT;
+    }
+
+    return MDM_OK;
+}
+
+void reinitialize_mdm(void)
+{
+    // Initialize the modem
+    printf(GRN "Modem RE-initializing..." DEF "\r\n");
+    if (!mdm_init()) {
+        printf(RED "\n\rModem RE-initialization failed!" DEF "\n");
+    }
+    printf("\r\n");
+}
+// These are built on the fly
+string MyServerIpAddress;
+string MySocketData;
+
+//********************************************************************************************************************************************
+//* Process JSON response messages
+//********************************************************************************************************************************************
+bool extract_JSON(char* search_field, char* found_string)
+{
+    char* beginquote;
+    char* endquote;
+    beginquote = strchr(search_field, '{'); //start of JSON
+    endquote = strchr(search_field, '}'); //end of JSON
+    if (beginquote)
+    {
+        uint16_t ifoundlen;
+        if (endquote)
+        {
+            ifoundlen = (uint16_t) (endquote - beginquote) + 1;
+            strncpy(found_string, beginquote, ifoundlen );
+            found_string[ifoundlen] = 0; //null terminate
+            return true;
+        }
+        else
+        {
+            endquote = strchr(search_field, '\0'); //end of string...  sometimes the end bracket is missing
+            ifoundlen = (uint16_t) (endquote - beginquote) + 1;
+            strncpy(found_string, beginquote, ifoundlen );
+            found_string[ifoundlen] = 0; //null terminate
+            return false;
+        }
+    }
+    else
+    {
+        return false;
+    }
+} //extract_JSON
+
+int cell_modem_init() 
+{
+    int i;
+
+    pc.baud(115200);
+     // Initialize the modem
+    printf(GRN "Modem initializing... will take up to 60 seconds" DEF "\r\n");
+    do {
+        i=mdm_init();
+        if (!i) {
+            pc.printf(RED "Modem initialization failed!" DEF "\n");
+        }
+    } while (!i);
+    
+    //Software init
+    software_init_mdm();
+ 
+    // Resolve URL to IP address to connect to
+    resolve_mdm();
+    // Open the socket (connect to the server)
+    sockopen_mdm();
+    return (0);
+}
+
+int cell_modem_Sendreceive(char* tx_string, char* rx_string) 
+{
+    int iStatus = 0; //error by default
+    printf(DEF "\r\n");
+    printf(BLU "Sending to modem : %s" DEF "\r\n", &tx_string[0]); 
+    sockwrite_mdm(&tx_string[0]);
+    if (sockread_mdm(&MySocketData, 1024, 20))
+    {
+        printf(DEF "\r\n");
+        printf(YEL "Read back : %s" DEF "\r\n", &MySocketData[0]);
+        char stringToCharBuf[BUF_SIZE_FOR_N_MAX_SOCKREAD*MAX_WNC_SOCKREAD_PAYLOAD+1]; // WNC can return max of 1500 (per sockread)
+        if ((MySocketData.length() + 1) < sizeof(stringToCharBuf))
+        {
+            strcpy(stringToCharBuf, MySocketData.c_str());
+            if (extract_JSON(stringToCharBuf, &rx_string[0]))
+            {
+                printf(GRN "JSON : %s" DEF "\n", &rx_string[0]);
+                iStatus = 1; //all good
+            }
+        }
+        else
+        {
+            printf(RED "BUFFER not big enough for sock data!" DEF "\r\n");
+        }
+    }
+    else
+    {
+        printf(RED "No response..." DEF "\r\n");
+    }
+    return iStatus;
+}
+