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linux: userspace GPIO control

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Allow use host GPIO pins for non-realtime purposes.

Signed-off-by: Andrey Kunitsyn <blackicebox@gmail.com>
This commit is contained in:
andryblack
2020-04-24 00:16:31 +03:00
committed by KevinOConnor
parent f0c394de81
commit 8fd330c54e
10 changed files with 187 additions and 22 deletions
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8
src/linux/analog.c
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@@ -15,15 +15,17 @@
DECL_CONSTANT("ADC_MAX", 4095); // Assume 12bit adc
DECL_ENUMERATION_RANGE("pin", "analog0", 0, 8);
#define ANALOG_START (1<<8)
DECL_ENUMERATION_RANGE("pin", "analog0", ANALOG_START, 8);
#define IIO_PATH "/sys/bus/iio/devices/iio:device0/in_voltage%d_raw"
struct gpio_adc
gpio_adc_setup(uint8_t pin)
gpio_adc_setup(uint32_t pin)
{
char fname[256];
snprintf(fname, sizeof(fname), IIO_PATH, pin);
snprintf(fname, sizeof(fname), IIO_PATH, pin-ANALOG_START);
int fd = open(fname, O_RDONLY|O_CLOEXEC);
if (fd < 0) {