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A simple project for sending button input up to AT&T Flow
Dependencies: FXOS8700CQ MODSERIAL mbed
For instructions on using this program, see the AT&T Starter Kit tutorial on it.
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; +} +