LailaTheElf/rp2040_projects
Archived
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Clean up onboard_temperature example slightly, and let i tbuild when there is no default LED

Browse Source
This commit is contained in:
graham sanderson 2022-05-17 19:43:30 -05:00
parent 6a747b3b71
commit 2a11e9f8f2
1 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
adc/onboard_temperature/onboard_temperature.c
View File

@ -20,8 +20,8 @@ float read_onboard_temperature(const char unit) {
/* 12-bit conversion, assume max value == ADC_VREF == 3.3 V */
const float conversionFactor = 3.3f / (1 << 12);
float adc = adc_read() * conversionFactor;
float tempC = 27.0 - (adc - 0.706) / 0.001721;
float adc = (float)adc_read() * conversionFactor;
float tempC = 27.0f - (adc - 0.706f) / 0.001721f;
if (unit == 'C') {
return tempC;
@ -29,13 +29,15 @@ float read_onboard_temperature(const char unit) {
return tempC * 9 / 5 + 32;
}
return -1.0;
return -1.0f;
}
int main() {
stdio_init_all();
#ifdef PICO_DEFAULT_LED_PIN
gpio_init(PICO_DEFAULT_LED_PIN);
gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
#endif
/* Initialize hardware AD converter, enable onboard temperature sensor and
* select its channel (do this once for efficiency, but beware that this
@ -48,10 +50,12 @@ int main() {
float temperature = read_onboard_temperature(TEMPERATURE_UNITS);
printf("Onboard temperature = %.02f %c\n", temperature, TEMPERATURE_UNITS);
#ifdef PICO_DEFAULT_LED_PIN
gpio_put(PICO_DEFAULT_LED_PIN, 1);
sleep_ms(10);
gpio_put(PICO_DEFAULT_LED_PIN, 0);
#endif
sleep_ms(990);
}