Move exmaples to separate directory
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59
examples/gpio.c
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59
examples/gpio.c
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#include <fcntl.h>
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#include <inttypes.h>
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#include <linux/gpio.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#define check(e) \
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({ \
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int ec = (e); \
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if (ec < 0) { \
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perror(#e); \
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exit(1); \
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} \
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ec; \
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})
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void gpio_info(int gpio_fd) {
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struct gpiochip_info chip_info;
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check(ioctl(gpio_fd, GPIO_GET_CHIPINFO_IOCTL, &chip_info));
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printf("Name: %s, Label: %s, %" PRIu32 " lines\n", chip_info.name,
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chip_info.label, chip_info.lines);
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for (__u32 i = 0; i != chip_info.lines; ++i) {
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struct gpio_v2_line_info line_info = {
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.offset = i,
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};
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check(ioctl(gpio_fd, GPIO_V2_GET_LINEINFO_IOCTL, &line_info));
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printf("Line %" PRIu32 ": '%s'. Consumer: %s\n", i, line_info.name,
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line_info.consumer[0] ? line_info.consumer : "<none>");
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}
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}
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int main() {
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int gpio0 = check(open("/dev/gpiochip0", O_RDWR));
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gpio_info(gpio0);
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#if 0
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struct gpio_v2_line_request line_request = {
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.offsets = {18},
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.num_lines = 1,
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.consumer = "my-super-cool-gpio",
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};
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check(ioctl(gpio0, GPIO_V2_GET_LINE_IOCTL, &line_request));
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struct gpio_v2_line_info line_info = {
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.offset = 18,
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};
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check(ioctl(gpio0, GPIO_V2_GET_LINEINFO_IOCTL, &line_info));
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printf("Line 18: '%s'. Consumer: '%s'\n", line_info.name, line_info.consumer);
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close(line_request.fd);
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#endif
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close(gpio0);
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}
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49
examples/i2c-schedule.py
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49
examples/i2c-schedule.py
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from time import sleep
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from random import binomialvariate
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DISPLAY = "display"
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SENSOR = "sensor"
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ZIGBEE = "zigbee"
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LABELS = {DISPLAY, SENSOR, ZIGBEE}
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time = 0
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transactions = []
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active_transaction = None
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slice_labels = {l: "" for l in LABELS}
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def display():
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if time % 5 == 1:
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transactions.append((DISPLAY, 4 if binomialvariate(p=0.15) else 2, 50))
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def sensor():
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if time % 5 == 0:
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transactions.append((SENSOR, 1, 10))
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def zigbee():
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if time % 15 == 14:
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transactions.append((ZIGBEE, 10, 100))
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print(' '*5, *(l[0] for l in LABELS))
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while True:
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display()
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sensor()
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zigbee()
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if active_transaction is None and transactions:
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active_transaction = min(transactions, key=lambda t: t[2])
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transactions.remove(active_transaction)
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print(f"t={time:02}: ", end="")
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if active_transaction is not None:
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label, duration, priority = active_transaction
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print(*('x' if l == label else '#' if any(t[0]==l for t in transactions) else ' ' for l in LABELS))
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active_transaction = (label, duration-1, priority) if duration > 1 else None
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transactions = [(l, d, p*0.8) for (l, d, p) in transactions]
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else:
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print(" ")
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time += 1
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sleep(1)
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89
examples/i2c.c
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89
examples/i2c.c
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#include <linux/i2c.h>
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#include <linux/i2c-dev.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <errno.h>
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#define check(e) ({\
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int ec = (e); \
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if(ec < 0) {\
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perror(#e); \
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exit(1);\
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}\
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ec;\
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})
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enum BME280Register {
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ID = 0xd0,
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CTRL_MEAS = 0xf4,
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PRESS_MSB = 0xf5,
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};
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typedef struct {
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int fd;
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} BME280;
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int i2c_read_register(int fd, uint8_t reg) {
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if(write(fd, ®, 1) < 0)
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return -1;
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uint8_t byte;
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if(read(fd, &byte, 1) < 0)
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return -1;
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return byte;
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}
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int i2c_read_registers(int fd, uint8_t start_addr, uint8_t* values, size_t n_bytes) {
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if(write(fd, &start_addr, 1) < 0)
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return -1;
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return read(fd, values, n_bytes);
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}
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int bme280_init(BME280* self, int fd) {
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self->fd = fd;
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if(i2c_read_register(fd, 0xd0) != 0x60)
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return -ENOTSUP;
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return 0;
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}
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int main() {
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int bus = check(open("/dev/i2c-1", O_RDWR));
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check(ioctl(bus, I2C_SLAVE, 0x76));
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#if 0
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// Check I2C driver compatibility
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unsigned long adapter_funcs;
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check(ioctl(bus, I2C_FUNCS, &adapter_funcs));
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for(size_t i = 0; i != (sizeof(funcs)/sizeof(*funcs)); ++i) {
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if(adapter_funcs & funcs[i].bit)
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puts(funcs[i].name);
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}
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#endif
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BME280 sensor;
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check(bme280_init(&sensor, bus));
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for(size_t j = 0; j != 10; ++j) {
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uint8_t ctrl_meas = (0b001u << 5) | (0b001 << 2) | 0b11;
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uint8_t bus_data[] = {CTRL_MEAS, ctrl_meas};
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check(write(bus, bus_data, 2));
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//TODO: should we sleep here? Maybe poll the busy flag?
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uint8_t sensor_data[8];
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check(i2c_read_registers(bus, PRESS_MSB, sensor_data, 8));
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for(size_t i = 0; i != sizeof(sensor_data); ++i) {
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printf("%02x ", sensor_data[i]);
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}
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puts("");
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sleep(1);
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}
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close(bus);
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}
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