void spi_txrx(uint8_t* bufTx,
uint8_t lenbufTx,
spi_return_t returnType,
uint8_t* bufRx,
uint8_t maxLenBufRx,
spi_first_t isFirst,
spi_last_t isLast) {
#ifdef SPI_IN_INTERRUPT_MODE
// disable interrupts
NVIC_RESETPRIMASK();
#endif
// register spi frame to send
spi_vars.pNextTxByte = bufTx;
spi_vars.numTxedBytes = 0;
spi_vars.txBytesLeft = lenbufTx;
spi_vars.returnType = returnType;
spi_vars.pNextRxByte = bufRx;
spi_vars.maxRxBytes = maxLenBufRx;
spi_vars.isFirst = isFirst;
spi_vars.isLast = isLast;
// SPI is now busy
spi_vars.busy = 1;
// lower CS signal to have slave listening
if (spi_vars.isFirst==SPI_FIRST) {
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
}
#ifdef SPI_IN_INTERRUPT_MODE
// implementation 1. use a callback function when transaction finishes
// write first byte to TX buffer
SPI_I2S_SendData(SPI2,*spi_vars.pNextTxByte);
// re-enable interrupts
NVIC_SETPRIMASK();
#else
// implementation 2. busy wait for each byte to be sent
// send all bytes
while (spi_vars.txBytesLeft>0) {
// write next byte to TX buffer
SPI_I2S_SendData(SPI2,*spi_vars.pNextTxByte);
// busy wait on the interrupt flag
while (SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_RXNE) == RESET);
// clear the interrupt flag
SPI_I2S_ClearFlag(SPI2, SPI_I2S_FLAG_RXNE);
// save the byte just received in the RX buffer
switch (spi_vars.returnType) {
case SPI_FIRSTBYTE:
if (spi_vars.numTxedBytes==0) {
*spi_vars.pNextRxByte = SPI_I2S_ReceiveData(SPI2);
}
break;
case SPI_BUFFER:
*spi_vars.pNextRxByte = SPI_I2S_ReceiveData(SPI2);
spi_vars.pNextRxByte++;
break;
case SPI_LASTBYTE:
*spi_vars.pNextRxByte = SPI_I2S_ReceiveData(SPI2);
break;
}
// one byte less to go
spi_vars.pNextTxByte++;
spi_vars.numTxedBytes++;
spi_vars.txBytesLeft--;
}
// put CS signal high to signal end of transmission to slave
if (spi_vars.isLast==SPI_LAST) {
GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
// SPI is not busy anymore
spi_vars.busy = 0;
#endif
}
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* Configure the system clocks */
RCC_Configuration();
/* Configure GPIOs */
GPIO_Configuration();
/* Configures the EXTI Lines */
EXTI_Configuration();
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_Init(&NVIC_InitStructure);
while (1)
{
if(LowPowerMode == 1)
{
LowPowerMode = 0;
/* Toggle GPIO_LED pin 6 */
GPIO_WriteBit(GPIO_LED, GPIO_Pin_6, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIO_LED, GPIO_Pin_6)));
#ifdef WFISLEEPONEXIT
NVIC_SystemLPConfig(NVIC_LP_SLEEPONEXIT, ENABLE);
#endif
#ifdef WFISLEEPNOW
NVIC_SystemLPConfig(NVIC_LP_SLEEPONEXIT, DISABLE);
__WFI();
#endif
#ifdef WFESEVONPEND
NVIC_SystemLPConfig(NVIC_LP_SEVONPEND, ENABLE);
/* Boost the execution priority to 0: no further exception can be asserted */
NVIC_SETPRIMASK();
#ifdef RTC_Alarm_WFEWakeUp
/* Set the RTC Alarm interrupt after 6s */
RTC_SetAlarm(0xFFFFFFFA);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Set the Counter to 0xFFFFFFF5 */
RTC_SetCounter(0xFFFFFFF5);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
#endif
__WFE();
#endif
#ifdef WFESEVONEVENT
NVIC_SystemLPConfig(NVIC_LP_SEVONPEND, DISABLE);
#ifdef RTC_Alarm_WFEWakeUp
/* Set the RTC Alarm interrupt after 6s */
RTC_SetAlarm(0xFFFFFFFA);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Set the Counter to 0xFFFFFFF5 */
RTC_SetCounter(0xFFFFFFF5);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
#endif
__WFE();
#endif
}
Delay(0xFFFFF);
/* Toggle GPIO_LED pin 9 */
GPIO_WriteBit(GPIO_LED, GPIO_Pin_9, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIO_LED, GPIO_Pin_9)));
}
}
