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AN664

PRECISION32™ CMSIS AND HAL USER’S GUIDE

Silicon Laboratories 

AN664

Each of the registers has a corresponding structure that defines the bit fields within that register. In addition,

registers that implement the clear and set addresses have 32-bit variables defined at the appropriate addresses.

Figure 6 shows the CONFIG register structure, which is declared as a part of the USART module structure.

Figure 6. Example USART CONFIG Register Structure

This CONFIG register structure has the TPARMD 2-bit field that controls the transmit parity. The U32 value

declared at the bottom of the structure is a union with the bit fields and is an entity that firmware can use to access

the entire register at one time.

The HAL Type.c functions and macros can access the entire USART0 CONFIG register:

SI32_USART_0->CONFIG.U32 = config;

The HAL can also read or write the TPARMD field in the USART0 CONFIG register:

parity = SI32_USART_0->CONFIG.TPARMD;

SI32_USART_0->CONFIG_SET = parity << SI32_USART_A_CONFIG_TPARMD_SHIFT;

Finally, the HAL can clear the TPARMD field:

SI32_USART_0->CONFIG_CLR = SI32_USART_A_CONFIG_TPARMD_MASK;

6

Rev. 0.2

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