unsigned char I2C_Read (int ack) {
/* Enable/disable Master acknowledge */
if (ack) I2C1->CR1 |= 0x0400;
else I2C1->CR1 &= ~0x0400;
while (!(I2C_sr() & 0x00000040)); /* Wait until RxNE bit set */
return (I2C1->DR);
}
/*-----------------------------------------------------------------------------
* WaitFlagSet: Wait until flag is cleared or timeout occured
*
* Parameters: fl - flag to check
*
* Return: 0 - flag is cleared
* 1 - flag not cleared, timeout occured
*----------------------------------------------------------------------------*/
static uint32_t WaitFlagClr (uint32_t fl) {
uint32_t i;
for (i = I2C_TOUT; i; i--) {
if (!(I2C_sr() & fl)) {
return (0);
}
}
return (1);
}
void I2C_Addr (unsigned char adr) {
I2C1->DR = adr;
while (!(I2C_sr() & 0x0002));
}
void I2C_Stop (void) {
I2C1->CR1 |= 0x0200;
while (I2C_sr() & 0x00020000); /* Wait until BUSY bit reset */
}
void I2C_Start (void) {
I2C1->CR1 |= 0x0100;
while (!(I2C_sr() & 0x0001));
}
void I2C_Write (unsigned char c) {
I2C1->DR = c;
while (!(I2C_sr() & 0x00000004)); /* Wait until BTF bit set */
}
