i2c_master: Add support for reading/writing to 16-bit registers (#14289)
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875e44faac
commit
bc1f5ef381
5 changed files with 130 additions and 3 deletions
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@ -187,7 +187,7 @@ Receive multiple bytes from the selected SPI device.
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### `i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)`
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Writes to a register on the I2C device.
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Writes to a register with an 8-bit address on the I2C device.
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#### Arguments
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@ -208,9 +208,32 @@ Writes to a register on the I2C device.
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---
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### `i2c_status_t i2c_writeReg16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)`
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Writes to a register with a 16-bit address (big endian) on the I2C device.
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#### Arguments
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- `uint8_t devaddr`
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The 7-bit I2C address of the device.
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- `uint16_t regaddr`
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The register address to write to.
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- `uint8_t *data`
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A pointer to the data to transmit.
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- `uint16_t length`
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The number of bytes to write. Take care not to overrun the length of `data`.
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- `uint16_t timeout`
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The time in milliseconds to wait for a response from the target device.
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#### Return Value
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`I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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---
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### `i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)`
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Reads from a register on the I2C device.
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Reads from a register with an 8-bit address on the I2C device.
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#### Arguments
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@ -229,6 +252,27 @@ Reads from a register on the I2C device.
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---
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### `i2c_status_t i2c_readReg16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)`
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Reads from a register with a 16-bit address (big endian) on the I2C device.
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#### Arguments
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- `uint8_t devaddr`
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The 7-bit I2C address of the device.
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- `uint16_t regaddr`
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The register address to read from.
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- `uint16_t length`
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The number of bytes to read. Take care not to overrun the length of `data`.
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- `uint16_t timeout`
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The time in milliseconds to wait for a response from the target device.
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#### Return Value
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`I2C_STATUS_TIMEOUT` if the timeout period elapses, `I2C_STATUS_ERROR` if some other error occurs, otherwise `I2C_STATUS_SUCCESS`.
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---
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### `i2c_status_t i2c_stop(void)`
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Stop the current I2C transaction.
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@ -202,6 +202,25 @@ i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data,
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return status;
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}
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i2c_status_t i2c_writeReg16(uint8_t devaddr, uint16_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
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i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
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if (status >= 0) {
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status = i2c_write(regaddr >> 8, timeout);
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if (status >= 0) {
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status = i2c_write(regaddr & 0xFF, timeout);
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for (uint16_t i = 0; i < length && status >= 0; i++) {
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status = i2c_write(data[i], timeout);
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}
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}
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}
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i2c_stop();
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return status;
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}
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
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i2c_status_t status = i2c_start(devaddr, timeout);
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if (status < 0) {
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@ -235,6 +254,43 @@ error:
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return (status < 0) ? status : I2C_STATUS_SUCCESS;
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}
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i2c_status_t i2c_readReg16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
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i2c_status_t status = i2c_start(devaddr, timeout);
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if (status < 0) {
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goto error;
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}
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status = i2c_write(regaddr >> 8, timeout);
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if (status < 0) {
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goto error;
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}
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status = i2c_write(regaddr & 0xFF, timeout);
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if (status < 0) {
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goto error;
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}
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status = i2c_start(devaddr | 0x01, timeout);
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for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
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status = i2c_read_ack(timeout);
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if (status >= 0) {
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data[i] = status;
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}
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}
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if (status >= 0) {
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status = i2c_read_nack(timeout);
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if (status >= 0) {
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data[(length - 1)] = status;
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}
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}
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error:
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i2c_stop();
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return (status < 0) ? status : I2C_STATUS_SUCCESS;
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}
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void i2c_stop(void) {
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// transmit STOP condition
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TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
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@ -39,5 +39,7 @@ int16_t i2c_read_nack(uint16_t timeout);
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i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_writeReg16(uint8_t devaddr, uint16_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_readReg16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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void i2c_stop(void);
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@ -102,7 +102,7 @@ i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data,
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i2cStart(&I2C_DRIVER, &i2cconfig);
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uint8_t complete_packet[length + 1];
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for (uint8_t i = 0; i < length; i++) {
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for (uint16_t i = 0; i < length; i++) {
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complete_packet[i + 1] = data[i];
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}
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complete_packet[0] = regaddr;
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@ -111,6 +111,21 @@ i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data,
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return chibios_to_qmk(&status);
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}
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i2c_status_t i2c_writeReg16(uint8_t devaddr, uint16_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
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i2c_address = devaddr;
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i2cStart(&I2C_DRIVER, &i2cconfig);
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uint8_t complete_packet[length + 2];
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for (uint16_t i = 0; i < length; i++) {
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complete_packet[i + 2] = data[i];
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}
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complete_packet[0] = regaddr >> 8;
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complete_packet[1] = regaddr & 0xFF;
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msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), complete_packet, length + 2, 0, 0, TIME_MS2I(timeout));
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return chibios_to_qmk(&status);
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}
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
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i2c_address = devaddr;
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i2cStart(&I2C_DRIVER, &i2cconfig);
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@ -118,4 +133,12 @@ i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16
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return chibios_to_qmk(&status);
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}
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i2c_status_t i2c_readReg16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
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i2c_address = devaddr;
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i2cStart(&I2C_DRIVER, &i2cconfig);
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uint8_t register_packet[2] = {regaddr >> 8, regaddr & 0xFF};
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msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), ®ister_packet, 2, data, length, TIME_MS2I(timeout));
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return chibios_to_qmk(&status);
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}
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void i2c_stop(void) { i2cStop(&I2C_DRIVER); }
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@ -96,5 +96,7 @@ i2c_status_t i2c_start(uint8_t address);
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i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_writeReg16(uint8_t devaddr, uint16_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_readReg16(uint8_t devaddr, uint16_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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void i2c_stop(void);
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