SCB (Serial Communication Block)

General Description

The Serial Communications Block (SCB) supports three serial communication protocols: Serial Peripheral Interface (SPI), Universal Asynchronous Receiver Transmitter (UART), and Inter Integrated Circuit (I2C or IIC).

Only one of the protocols is supported by an SCB at any given time.

The functions and other declarations used in this driver are in cy_scb_spi.h, cy_scb_uart.h, cy_scb_ezi2c.h, cy_scb_i2c.h respectively. Include cy_pdl.h (ModusToolbox only) to get access to all functions and declarations in the PDL.

More Information

For more information on the SCB peripheral, refer to the technical reference manual (TRM).

MISRA-C Compliance

The SCB driver has the following specific deviations:

MISRA rule	Rule Class (Required/Advisory)	Rule Description	Description of Deviation(s)
11.5	A	A conversion should not be performed from pointer to void into pointer to object.	The pointer to the buffer memory is void to allow handling of different data types: uint8_t (4-8 bits) or uint16_t (9-16 bits). The cast operation is safe because the configuration is verified before operation is performed. The functions Cy_SCB_I2C_DeepSleepCallback and Cy_SCB_I2C_HibernateCallback are callback of cy_en_syspm_status_t type. The cast operation safety in these functions becomes the user's responsibility because pointers are initialized when callback is registered in SysPm driver. The functions Cy_SCB_EZI2C_DeepSleepCallback and Cy_SCB_EZI2C_HibernateCallback are callback of cy_en_syspm_status_t type. The cast operation safety in these functions becomes the user's responsibility because pointers are initialized when callback is registered in SysPm driver. The functions Cy_SCB_UART_DeepSleepCallback and Cy_SCB_UART_HibernateCallback are callback of cy_en_syspm_status_t type. The cast operation safety in these functions becomes the user's responsibility because pointers are initialized when callback is registered in SysPm driver. The functions Cy_SCB_SPI_DeepSleepCallback and Cy_SCB_SPI_HibernateCallback are callback of cy_en_syspm_status_t type. The cast operation safety in these functions becomes the user's responsibility because pointers are initialized when callback is registered in SysPm driver.
15.5	R	A function should have a single point of exit at the end.	The functions can return from several points. This is done to improve code clarity when returning error status code if input parameters validation fails.

Changelog

Version	Changes	Reason for Change
1.0	Initial version.

API Reference
	Common
	Common API for the Serial Communication Block.
	EZI2C (SCB)
	Driver API for EZI2C Slave Peripheral.
	I2C (SCB)
	Driver API for I2C Bus Peripheral.
	SPI (SCB)
	Driver API for SPI Peripheral.
	UART (SCB)
	Driver API for UART.