static void i2c_wr_bit(i2cInfo *inf, bool b) {
jshPinSetValue(inf->pinSDA, b);
dly(inf);
jshPinSetValue(inf->pinSCL, 1);
dly(inf);
int timeout = I2C_TIMEOUT;
while (!jshPinGetValue(inf->pinSCL) && --timeout); // clock stretch
if (!timeout) err("Timeout (wr)");
jshPinSetValue(inf->pinSCL, 0);
jshPinSetValue(inf->pinSDA, 1); // stop forcing SDA (needed?)
}
static bool i2c_rd_bit(i2cInfo *inf) {
jshPinSetValue(inf->pinSDA, 1); // stop forcing SDA
dly(inf);
jshPinSetValue(inf->pinSCL, 1); // stop forcing SDA
int timeout = I2C_TIMEOUT;
while (!jshPinGetValue(inf->pinSCL) && --timeout); // clock stretch
if (!timeout) err("Timeout (rd)");
dly(inf);
bool b = jshPinGetValue(inf->pinSDA);
jshPinSetValue(inf->pinSCL, 0);
return b;
}
int main(void)
{
LPC_GPIO1->DIR=(1<<6);
while(1)
{
LPC_GPIO1->OUT = LPC_GPIO1->OUT&~(1<<6);
dly();
LPC_GPIO1->OUT = LPC_GPIO1->OUT|(1<<6);
dly();
}
return 0 ;
}
static void i2c_stop(i2cInfo *inf) {
jshPinSetValue(inf->pinSDA, 0);
dly(inf);
jshPinSetValue(inf->pinSCL, 1);
int timeout = I2C_TIMEOUT;
while (!jshPinGetValue(inf->pinSCL) && --timeout); // clock stretch
if (!timeout) err("Timeout (stop)");
dly(inf);
jshPinSetValue(inf->pinSDA, 1);
dly(inf);
if (!jshPinGetValue(inf->pinSDA)) err("Arbitration (stop)");
dly(inf);
inf->started = false;
}
static void i2c_start(i2cInfo *inf) {
if (inf->started) {
// reset
jshPinSetValue(inf->pinSDA, 1);
dly(inf);
jshPinSetValue(inf->pinSCL, 1);
int timeout = I2C_TIMEOUT;
while (!jshPinGetValue(inf->pinSCL) && --timeout); // clock stretch
if (!timeout) err("Timeout (start)");
dly(inf);
}
if (!jshPinGetValue(inf->pinSDA)) err("Arbitration (start)");
jshPinSetValue(inf->pinSDA, 0);
dly(inf);
jshPinSetValue(inf->pinSCL, 0);
dly(inf);
inf->started = true;
}
int16_t halCalibrateVlo()
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
dly(1000); // Wait for oscillators to settle
uint16_t temp_BCSCTL1 = BCSCTL1;
uint16_t temp_TACCTL0 = TACCTL0;
uint16_t temp_TACTL = TACTL;
BCSCTL1 |= DIVA_3; // Divide ACLK by 8
TACCTL0 = CM_1 + CCIS_1 + CAP; // Capture on ACLK
TACTL = TASSEL_2 + MC_2 + TACLR; // Start TA, SMCLK(DCO), Continuous
while ((TACCTL0 & CCIFG) == 0); // Wait until capture
TACCR0 = 0; // Ignore first capture
TACCTL0 &= ~CCIFG; // Clear CCIFG
while ((TACCTL0 & CCIFG) == 0); // Wait for next capture
unsigned int firstCapture = TACCR0; // Save first capture
TACCTL0 &= ~CCIFG; // Clear CCIFG
while ((TACCTL0 & CCIFG) ==0); // Wait for next capture
unsigned long counts = (TACCR0 - firstCapture); // # of VLO clocks in 8Mhz
BCSCTL1 = temp_BCSCTL1; // Restore original settings
TACCTL0 = temp_TACCTL0;
TACTL = temp_TACTL;
//TACCTL0 = 0; TACTL = 0; // Clear Timer settings
signed int aClk = ((unsigned int) (32000000l / counts));
if ((aClk > VLO_MIN) && (aClk < VLO_MAX))
return aClk;
else
return -1;
}
