UM1573

ST7540 stack firmware code

Doc ID 023619 Rev 1

9/27

The data structure is the following:

typedef struct

{

/* Interrupt priorities */

uint8_t

PLM_SPI_PreemptyPriority;

uint8_t

PLM_SPI_SubPriority;

uint8_t

PLM_CDPD_PreemptyPriority;

uint8_t

PLM_CDPD_SubPriority;

}PLM_IntPriorityInitTypeDef;

Figure 6.

ST7540 driver structure

Next, the ST7540 is configured and programmed by the following function:

void PLM_Init(PLM_InitTypeDef *PLM_InitStruct);

This routine sets up all the modem parameters and initializes its internal registers. The

structure passed to the API is the following:

typedef struct

{

PLMFreq_TypeDef

PLM_BandpassFrequency;

PLMBaudrate_TypeDef

PLM_BaudRate;

uint16_t

PLM_HeaderPreamble;

PLMDeviation_TypeDef

PLM_Deviation;

PLMPrefilter_TypeDef

PLM_PreFilter;

PLMSensitivity_TypeDef

PLM_Sensitivity;

}PLM_InitTypeDef;

In the stm32f10x_plm.h file all the typedefs of the previous structure with the admitted

values for the PLM parameters are defined.

The following APIs are used for the ST7540 peripheral management, and are the starting

point for implementing its own stack firmware.

PLM (ST7540) DRIVER

SPI Std. Peripheral Lib.

EXTI Std. Peripheral Lib.

ST7540 APIs

GPIO Std. Peripheral Lib.

AM15248v1