Factor resources, fix time
Now there is a generic resource that can generate and parse application/json as well as text/plain. It can be re-used, only the from_string and to_string routines have to be written and the resource properly set up. A new resource format is specified, see GENERIC_RESOURCE in, e.g., examples/osd/pwm-example. This is now used in all my examples, namely pwm-example, arduino-sketch, wallclock-time. There was an off by one error for the month in time formatting (in gmtime and localtime). And the leap-year computation was broken. Both fixed now, so we get a correct date. For localtime we are still 2 hours off because daylight saving isn't implemented yet. Also renamed gmtime to utc.
This commit is contained in:
Ralf Schlatterbeck
parent
9df7ab3875
commit
4643c5d02d
12 changed files with 488 additions and 612 deletions
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@ -66,7 +66,7 @@ CFLAGS += -DUIP_CONF_TCP=1
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APPS += er-http-engine
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endif
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APPS += erbium json
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APPS += erbium json json-resource
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include $(CONTIKI)/Makefile.include
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@ -15,6 +15,7 @@
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/* Only coap 13 for now */
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#include "er-coap-13.h"
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#include "hw_timer.h"
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#include "generic_resource.h"
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/* Error-handling macro */
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# define BYE(_exp, _tag) \
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@ -44,131 +45,32 @@ void led_pwm_init (void)
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DDRE |= (1<<PINE5);
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}
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RESOURCE \
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void pwm_from_string (const char *name, const char *s)
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{
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pwm = atoi (s);
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if (pwm > max_ticks) {
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pwm = max_ticks;
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}
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PRINTF ("Setting: %d (max=%d)\n", pwm, max_ticks);
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hwtimer_pwm_inverse (3, HWT_CHANNEL_C);
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DDRE |= (1<<PINE5);
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hwtimer_set_pwm (3, HWT_CHANNEL_C, pwm);
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PRINTF
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( "TCNT3: %04X TCCR3A: %04X TCCR3B: %04X TCCR3C: %04X OCR3C: %04X\n"
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, TCNT3, TCCR3A, TCCR3B, TCCR3C, OCR3C
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);
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}
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size_t pwm_to_string (const char *n, uint8_t is_json, char *buf, size_t bufsize)
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{
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return snprintf (buf, bufsize, "%d", pwm);
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}
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GENERIC_RESOURCE \
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( led_pwm, METHOD_GET | METHOD_PUT
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, "led/pwm"
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, "title=\"LED PWM\";rt=\"led pwm\""
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, LED PWM
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, duty-cycle
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, pwm_from_string
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, pwm_to_string
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);
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void
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led_pwm_handler
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( void* request
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, void* response
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, uint8_t *buffer
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, uint16_t preferred_size
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, int32_t *offset
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)
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{
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int success = 1;
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int i;
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char temp[100];
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int index = 0;
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int length = 0;
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int tag = 0;
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const uint8_t *bytes = NULL;
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size_t len = 0;
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int n_acc = 0;
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const uint16_t *accept = NULL;
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uint16_t a_ctype = REST.type.APPLICATION_JSON;
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uint16_t c_ctype = REST.get_header_content_type (request);
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/* Seems like accepted type is currently unsupported? */
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n_acc = REST.get_header_accept (request, &accept);
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for (i=0; i<n_acc; i++) {
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if ( accept [i] == REST.type.TEXT_PLAIN
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|| accept [i] == REST.type.APPLICATION_JSON
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)
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{
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a_ctype = accept [i];
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break;
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}
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}
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switch(REST.get_method_type(request)) {
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case METHOD_GET:
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// TEXT format
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if (a_ctype == REST.type.TEXT_PLAIN) {
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index += sprintf (temp + index, "%d\n", pwm);
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} else { // jSON Format
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index += sprintf
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( temp + index
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,"{\n \"pwm\" : \"%d\"\n}\n"
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, pwm
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);
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}
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length = strlen(temp);
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memcpy (buffer, temp, length);
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REST.set_header_content_type (response, a_ctype);
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REST.set_response_payload (response, buffer, length);
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break;
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case METHOD_PUT:
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if ((len = coap_get_payload(request, &bytes))) {
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PRINTF ("PUT: len: %d, %s\n", len, (char *)bytes);
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if (c_ctype == REST.type.TEXT_PLAIN) {
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temp [sizeof (temp) - 1] = 0;
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strncpy (temp, (char *)bytes, MIN (len + 1, sizeof (temp) - 1));
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} else { // jSON Format
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struct jsonparse_state state;
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struct jsonparse_state *parser = &state;
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jsonparse_setup (parser, (char *)bytes, len);
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if ((tag = jsonparse_next (parser)) != JSON_TYPE_OBJECT) {
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BYE ("OBJECT", tag);
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}
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if ((tag = jsonparse_next (parser)) != JSON_TYPE_PAIR_NAME) {
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BYE ("PAIR_NAME", tag);
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}
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while (jsonparse_strcmp_value (parser, "pwm") != 0) {
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_PAIR) {
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BYE ("PAIR", tag);
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}
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tag = jsonparse_next (parser);
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tag = jsonparse_next (parser);
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if (tag != ',') {
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BYE (",", tag);
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}
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_PAIR_NAME) {
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BYE ("PAIR_NAME", tag);
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}
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}
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_PAIR) {
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BYE ("PAIR", tag);
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}
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_STRING) {
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BYE ("STRING", tag);
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}
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jsonparse_copy_value (parser, temp, sizeof (temp));
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temp [sizeof (temp) - 1] = 0;
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}
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PRINTF ("GOT: %s\n", temp);
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pwm = atoi (temp);
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if (pwm > max_ticks) {
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pwm = max_ticks;
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}
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PRINTF ("Setting: %d (max=%d)\n", pwm, max_ticks);
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hwtimer_pwm_inverse (3, HWT_CHANNEL_C);
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DDRE |= (1<<PINE5);
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hwtimer_set_pwm (3, HWT_CHANNEL_C, pwm);
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PRINTF
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( "TCNT3: %04X TCCR3A: %04X TCCR3B: %04X TCCR3C: %04X OCR3C: %04X\n"
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, TCNT3, TCCR3A, TCCR3B, TCCR3C, OCR3C
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);
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REST.set_response_status(response, REST.status.CHANGED);
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} else {
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PRINTF ("PUT: len: %d\n", len);
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success = 0;
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}
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bye :
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break;
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default:
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success = 0;
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}
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if (!success) {
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REST.set_response_status(response, REST.status.BAD_REQUEST);
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}
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}
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