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[Docs] Correct I2C API reference (#24840)

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Ryan 2025-01-21 09:53:35 +11:00 • committed by GitHub
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34
docs/drivers/i2c.md
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@ -147,7 +147,7 @@ void i2c_init(void) {
---
### `i2c_status_t i2c_transmit(uint8_t address, uint8_t *data, uint16_t length, uint16_t timeout)` {#api-i2c-transmit}
### `i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout)` {#api-i2c-transmit}
Send multiple bytes to the selected I2C device.
@ -155,7 +155,7 @@ Send multiple bytes to the selected I2C device.
- `uint8_t address`
The 7-bit I2C address of the device.
- `uint8_t *data`
- `const uint8_t* data`
A pointer to the data to transmit.
- `uint16_t length`
The number of bytes to write. Take care not to overrun the length of `data`.
@ -176,7 +176,7 @@ Receive multiple bytes from the selected I2C device.
- `uint8_t address`
The 7-bit I2C address of the device.
- `uint8_t *data`
- `uint8_t* data`
A pointer to the buffer to read into.
- `uint16_t length`
The number of bytes to read. Take care not to overrun the length of `data`.
@ -189,7 +189,7 @@ Receive multiple bytes from the selected I2C device.
---
### `i2c_status_t i2c_write_register(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)` {#api-i2c-write-register}
### `i2c_status_t i2c_write_register(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout)` {#api-i2c-write-register}
Writes to a register with an 8-bit address on the I2C device.
@ -199,7 +199,7 @@ Writes to a register with an 8-bit address on the I2C device.
The 7-bit I2C address of the device.
- `uint8_t regaddr`
The register address to write to.
- `uint8_t *data`
- `const uint8_t* data`
A pointer to the data to transmit.
- `uint16_t length`
The number of bytes to write. Take care not to overrun the length of `data`.
@ -212,7 +212,7 @@ Writes to a register with an 8-bit address on the I2C device.
---
### `i2c_status_t i2c_write_register16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)` {#api-i2c-write-register16}
### `i2c_status_t i2c_write_register16(uint8_t devaddr, uint16_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout)` {#api-i2c-write-register16}
Writes to a register with a 16-bit address (big endian) on the I2C device.
@ -222,10 +222,10 @@ Writes to a register with a 16-bit address (big endian) on the I2C device.
The 7-bit I2C address of the device.
- `uint16_t regaddr`
The register address to write to.
- `uint8_t *data`
- `const uint8_t* data`
A pointer to the data to transmit.
- `uint16_t length`
The number of bytes to write. Take care not to overrun the length of `data`.
The number of bytes to write. Take care not to overrun the length of `data`.
- `uint16_t timeout`
The time in milliseconds to wait for a response from the target device.
@ -245,8 +245,10 @@ Reads from a register with an 8-bit address on the I2C device.
The 7-bit I2C address of the device.
- `uint8_t regaddr`
The register address to read from.
- `uint8_t data`
A pointer to a buffer to read into.
- `uint16_t length`
The number of bytes to read. Take care not to overrun the length of `data`.
The number of bytes to read. Take care not to overrun the length of `data`.
- `uint16_t timeout`
The time in milliseconds to wait for a response from the target device.
@ -266,8 +268,10 @@ Reads from a register with a 16-bit address (big endian) on the I2C device.
The 7-bit I2C address of the device.
- `uint16_t regaddr`
The register address to read from.
- `uint8_t* data`
A pointer to a buffer to read into.
- `uint16_t length`
The number of bytes to read. Take care not to overrun the length of `data`.
The number of bytes to read. Take care not to overrun the length of `data`.
- `uint16_t timeout`
The time in milliseconds to wait for a response from the target device.
@ -279,19 +283,19 @@ Reads from a register with a 16-bit address (big endian) on the I2C device.
### `i2c_status_t i2c_ping_address(uint8_t address, uint16_t timeout)` {#api-i2c-ping-address}
Pings the I2C bus for a specific address.
Pings the I2C bus for a specific address.
On ChibiOS a "best effort" attempt is made by reading a single byte from register 0 at the requested address. This should generally work except for I2C devices that do not not respond to a register 0 read request, which will result in a false negative result (unsucessful response to ping attempt).
On ChibiOS a "best effort" attempt is made by reading a single byte from register 0 at the requested address. This should generally work except for I2C devices that do not not respond to a register 0 read request, which will result in a false negative result (unsuccessful response to ping attempt).
This function is weakly defined, meaning it can be overridden if necessary for your particular use case:
This function is weakly defined, meaning it can be overridden if necessary for your particular use case.
#### Arguments
#### Arguments {#api-i2c-ping-address-arguments}
- `uint8_t address`
The 7-bit I2C address of the device (ie. without the read/write bit - this will be set automatically).
- `uint16_t timeout`
The time in milliseconds to wait for a response from the target device.
#### Return Value
#### Return Value {#api-i2c-ping-address-return}
`I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.