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9d77f44995
Reading an I2C device from the Linux MCU used a separate write(2)
to select the target register & read(2) to get the value(s). This
implementation uses ioctl(file, I2C_RDWR, ...) to skip a large bus idle
period and extra process sleep by combining them like the stm32.
I2C_RDRW requires I2C_FUNC_I2C flag in the I2C driver. I2C_FUNC_I2C
is defined in:
BCM2835: Pi 1 Models A, A+, B, B+, the Raspberry Pi Zero, the
Raspberry Pi Zero W, and the Raspberry Pi Compute Module 1
BCM2836: Pi 2 Model B
Identical to BCM2835 except Cortex
BCM2837: Pi 3 Model B, later models of the Raspberry Pi 2 Model B,
and the Raspberry Pi Compute Module 3
BCM2837B0: Pi 3 Models A+, B+, and the Raspberry Pi Compute Module 3+
BCM2711: Pi 4 Model B, the Raspberry Pi 400, and the Raspberry Pi
Compute Module 4
RK3xxx: Rockchips SoCs NanoPi, RockPi, Tinker, etc.
SUNXI: H2, H3, etc. Orange Pi
AMLOGIC: S905x, Banana Pi, Odroid, etc.
TEGRA: NVidia Jetson etc.
MediaTek: Several SBCs in other ranges
Signed-off-by: Matthew Swabey <matthew@swabey.org>
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
#ifndef __LINUX_GPIO_H
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#define __LINUX_GPIO_H
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#include <stdint.h> // uint8_t
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struct gpio_out {
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struct gpio_line* line;
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};
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struct gpio_out gpio_out_setup(uint32_t pin, uint8_t val);
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void gpio_out_reset(struct gpio_out g, uint8_t val);
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void gpio_out_toggle_noirq(struct gpio_out g);
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void gpio_out_toggle(struct gpio_out g);
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void gpio_out_write(struct gpio_out g, uint8_t val);
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struct gpio_in {
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struct gpio_line* line;
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};
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struct gpio_in gpio_in_setup(uint32_t pin, int8_t pull_up);
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void gpio_in_reset(struct gpio_in g, int8_t pull_up);
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uint8_t gpio_in_read(struct gpio_in g);
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struct gpio_adc {
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int fd;
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};
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struct gpio_adc gpio_adc_setup(uint32_t pin);
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uint32_t gpio_adc_sample(struct gpio_adc g);
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uint16_t gpio_adc_read(struct gpio_adc g);
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void gpio_adc_cancel_sample(struct gpio_adc g);
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struct spi_config {
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int fd;
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int rate;
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};
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struct spi_config spi_setup(uint32_t bus, uint8_t mode, uint32_t rate);
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void spi_prepare(struct spi_config config);
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void spi_transfer(struct spi_config config, uint8_t receive_data
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, uint8_t len, uint8_t *data);
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struct gpio_pwm {
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int duty_fd, enable_fd;
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uint32_t period;
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};
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struct gpio_pwm gpio_pwm_setup(uint32_t pin, uint32_t cycle_time, uint16_t val);
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void gpio_pwm_write(struct gpio_pwm g, uint16_t val);
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struct i2c_config {
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int fd;
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uint8_t addr;
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};
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struct i2c_config i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr);
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void i2c_write(struct i2c_config config, uint8_t write_len, uint8_t *write);
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void i2c_read(struct i2c_config config, uint8_t reg_len, uint8_t *reg
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, uint8_t read_len, uint8_t *read);
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#endif // gpio.h
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