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AN664

PRECISION32™ CMSIS AND HAL USER’S GUIDE

Silicon Laboratories 

AN664

4.1. USART0 HAL Example

The sim3u1xx.h device file contains the USART0 interrupt vector (USART0_IRQn) and base pointer information

(SI32_USART_0). The SI32_USART_A_Registers.h file contains the module structure, which includes structures

of bit fields for each register. The SI32_USART_A_Type.h and Type.c files contain routines that access each of

these bits.

Figure 4 displays a block diagram showing the relationship of the HAL files for the USART0 module.

sim3u1xx.h

Interrupt Vector: USART0_IRQn

Base Pointer: SI32_USART_0

USART0

SI32_USART_A_Registers.h

CONFIG.TPARMD

#define SI32_USART_A_CONFIG_TPARMD_MASK 0x00600000

#define SI32_USART_A_CONFIG_TPARMD_SHIFT 21

// Odd Parity.

#define SI32_USART_A_CONFIG_TPARMD_ODD_VALUE 0

#define SI32_USART_A_CONFIG_TPARMD_ODD_U32 \

(SI32_USART_A_CONFIG_TPARMD_ODD_VALUE <<

SI32_USART_A_CONFIG_TPARMD_SHIFT)

...

SI32_USART_A_Type.c

void

_SI32_USART_A_select_tx_parity(

SI32_USART_A_Type * basePointer,

uint32_t parity)

{

assert(parity < 4); // parity < 2^2

//{{

basePointer->CONFIG_CLR = SI32_USART_A_CONFIG_TPARMD_MASK;

basePointer->CONFIG_SET = parity << SI32_USART_A_CONFIG_TPARMD_SHIFT;

//}}

}

SI32_USART_A_Type.h

void

_SI32_USART_A_select_tx_parity(

SI32_USART_A_Type * basePointer,

uint32_t parity);

Figure 4. Example USART HAL Block Diagram

Firmware can call the USART0 select tx parity routine using the base pointer defined in si3mu1xx.h and the

function implemented in SI32_USART_A_Type.c:

SI32_USART_A_select_tx_parity(SI32_USART_0, parity);

4

Rev. 0.2

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