51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
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#include "lwip/apps/httpd.h"
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#include "pico/cyw43_arch.h"
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#include "hardware/adc.h"
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// SSI tags - tag length limited to 8 bytes by default
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const char * ssi_tags[] = {"volt","temp","led"};
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u16_t ssi_handler(int iIndex, char *pcInsert, int iInsertLen) {
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size_t printed;
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switch (iIndex) {
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case 0: // volt
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{
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const float voltage = adc_read() * 3.3f / (1 << 12);
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printed = snprintf(pcInsert, iInsertLen, "%f", voltage);
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}
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break;
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case 1: // temp
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{
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const float voltage = adc_read() * 3.3f / (1 << 12);
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const float tempC = 27.0f - (voltage - 0.706f) / 0.001721f;
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printed = snprintf(pcInsert, iInsertLen, "%f", tempC);
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}
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break;
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case 2: // led
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{
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bool led_status = cyw43_arch_gpio_get(CYW43_WL_GPIO_LED_PIN);
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if(led_status == true){
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printed = snprintf(pcInsert, iInsertLen, "ON");
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}
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else{
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printed = snprintf(pcInsert, iInsertLen, "OFF");
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}
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}
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break;
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default:
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printed = 0;
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break;
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}
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return (u16_t)printed;
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}
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// Initialise the SSI handler
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void ssi_init() {
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// Initialise ADC (internal pin)
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adc_init();
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adc_set_temp_sensor_enabled(true);
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adc_select_input(4);
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http_set_ssi_handler(ssi_handler, ssi_tags, LWIP_ARRAYSIZE(ssi_tags));
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}
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