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drivers/at: add a function read a response plus the OK

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There are many modem commands for which you get a line of response followed
by an OK. Take for example the AT+CGSN command to get the IMEI of a Ublox
G350.
  >> AT+CGSN
  << 004999010640000
  << OK
This commit is contained in:
Kees Bakker 2022-09-04 20:58:27 +02:00
parent 72d16e152a
commit 94474236f1
2 changed files with 71 additions and 0 deletions
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50
drivers/at/at.c
View File

@ -228,6 +228,56 @@ out:
return res;
}
ssize_t at_send_cmd_get_resp_wait_ok(at_dev_t *dev, const char *command, const char *resp_prefix,
char *resp_buf, size_t len, uint32_t timeout)
{
ssize_t res;
ssize_t res_ok;
char ok_buf[64];
at_drain(dev);
res = at_send_cmd(dev, command, timeout);
if (res) {
goto out;
}
res = at_readline(dev, resp_buf, len, false, timeout);
if (res == 0) {
/* skip possible empty line */
res = at_readline(dev, resp_buf, len, false, timeout);
}
/* Strip the expected prefix */
if (res > 0 && resp_prefix && *resp_prefix) {
size_t prefix_len = strlen(resp_prefix);
if (strncmp(resp_buf, resp_prefix, prefix_len) == 0) {
size_t remaining_len = strlen(resp_buf) - prefix_len;
/* The one extra byte in the copy is the terminating nul byte */
memmove(resp_buf, resp_buf + prefix_len, remaining_len + 1);
res -= prefix_len;
}
}
/* wait for OK */
if (res >= 0) {
res_ok = at_readline(dev, ok_buf, sizeof(ok_buf), false, timeout);
if (res_ok == 0) {
/* skip possible empty line */
res_ok = at_readline(dev, ok_buf, sizeof(ok_buf), false, timeout);
}
ssize_t len_ok = sizeof(CONFIG_AT_RECV_OK) - 1;
if ((len_ok != 0) && (strcmp(ok_buf, CONFIG_AT_RECV_OK) == 0)) {
}
else {
/* Something else then OK */
res = -1;
}
}
out:
return res;
}
ssize_t at_send_cmd_get_lines(at_dev_t *dev, const char *command,
char *resp_buf, size_t len, bool keep_eol, uint32_t timeout)
{

21
drivers/include/at.h
View File

@ -248,6 +248,27 @@ int at_send_cmd_wait_prompt(at_dev_t *dev, const char *command, uint32_t timeout
*/
ssize_t at_send_cmd_get_resp(at_dev_t *dev, const char *command, char *resp_buf, size_t len, uint32_t timeout);
/**
* @brief Send AT command, wait for response plus OK
*
* This function sends the supplied @p command, then waits and returns one
* line of response.
*
* A possible empty line will be skipped.
*
* @param[in] dev device to operate on
* @param[in] command command to send
* @param[in] resp_prefix expected prefix in the response
* @param[out] resp_buf buffer for storing response
* @param[in] len len of @p buffer
* @param[in] timeout timeout (in usec)
*
* @returns length of response on success
* @returns <0 on error
*/
ssize_t at_send_cmd_get_resp_wait_ok(at_dev_t *dev, const char *command, const char *resp_prefix,
char *resp_buf, size_t len, uint32_t timeout);
/**
* @brief Send AT command, wait for multiline response
*