/**
* @brief This function Clears bit value at given address
* @param Address SRAM or Peripheral Address
* Can choose any address between :
* 0x20000000 - 0x2001FFFC | for SRAM
* 0x40000000 - 0x40007FFC : APB1 |
* 0x40010000 - 0x40057fff : APB2 | for Peripheral
* 0x40020000 - 0x4007FFFC : AHB1 |
* or Use Register Address: (uint32_t)&(GPIOD->BSRR)
* @param pin Pin Value from Word
* @return None
*/
void Bitband_clearbit(uint32_t Address, uint8_t pin)
{
if (Address >= 0x20000000 && Address <= 0x2001FFFC)
{
BITBAND_SRAM_ClearBit(Address, pin);
}
else if((Address >= 0x40000000 && Address <= 0x40007FFC) || (Address >= 0x40010000 && Address <= 0x40057fff)
||(Address >= 0x40020000 && Address <= 0x4007FFFC))
{
BITBAND_Peri_ClearBit(Address, pin);
}
}
/*********************************************************************//**
* @brief c_entry: main function
* @param[in] none
* @return int
**********************************************************************/
int c_entry(void) { /* Main Program */
uint32_t temp;
/* Initialize debug via UART0
* – 115200bps
* – 8 data bit
* – No parity
* – 1 stop bit
* – No flow control
*/
debug_frmwrk_init();
//print menu
_DBG(menu);
/* test Bit-banding SRAM first --------------------------------------------------------- */
_DBG_("Test bit-band SRAM... ");
//read variable at VAR_ADDRESS
temp = (*(volatile uint32_t *)(VAR_ADDRESS));
//print temp value
_DBG("The value at address "); _DBH32(VAR_ADDRESS); _DBG(": ");
_DBH32(temp); _DBG_("");
/* Use bitband function to read VAR_BIT value */
temp = BITBAND_SRAM_GetBit(VAR_ADDRESS,VAR_BIT);
_DBG("Use bit-band function to get value at bit 3: ");_DBG_("");
_DBH32(temp); _DBG_("");
/* clear bit */
BITBAND_SRAM_ClearBit(VAR_ADDRESS,VAR_BIT);
/* re-read temp value */
temp = (*(volatile uint32_t *)(VAR_ADDRESS));
_DBG("Value after clear bit 3 value by using bit-band function: ");_DBG_("");
_DBH32(temp); _DBG_("");
/* Set bit */
BITBAND_SRAM_SetBit(VAR_ADDRESS,VAR_BIT);
/* re-read temp value */
temp = (*(volatile uint32_t *)(VAR_ADDRESS));
_DBG("Value after set bit 3 value by using bit-band function: ");_DBG_("");
_DBH32(temp); _DBG_("");
_DBG_("");
/* Then, test Bit-banding PERI --------------------------------------------------------- */
_DBG_("Test bit-band PERIPHERAL... ");
LPC_SPI->SPCR =(1<<5)|(1<<3)|(10<<8);
/* Read the current value of peripheral register */
temp = (*(volatile uint32_t *)(PERI_ADDRESS));
_DBG("The value of peripheral register at "); _DBH32(PERI_ADDRESS); _DBG(": ");_DBG_("");
_DBH32(temp); _DBG_("");
/* Use bitband function to read VAR_BIT value */
temp = BITBAND_PERI_GetBit(PERI_ADDRESS,PERI_BIT);
_DBG("Use bit-band function to get value at bit 5: ");_DBG_(""); _DBH32(temp); _DBG_("");
/* clear bit */
BITBAND_PERI_ClearBit(PERI_ADDRESS,PERI_BIT);
/* re-read temp value */
temp = (*(volatile uint32_t *)(PERI_ADDRESS));
_DBG("Peripheral register after clear bit 5 value by using bit-band function: ");_DBG_("");
_DBH32(temp); _DBG_("");
/* Set bit */
BITBAND_PERI_SetBit(PERI_ADDRESS,PERI_BIT);
/* re-read temp value */
temp = (*(volatile uint32_t *)(PERI_ADDRESS));
_DBG("Peripheral register after set bit 5 value by using bit-band function: ");_DBG_("");
_DBH32(temp); _DBG_("");
while (1);
return 0;
}