defines changed from TARGET_LPC1768 to TARGET_LPC176X to support LPC1769 target
Fork of FastAnalogIn by
FastAnalogIn_LPC11UXX.cpp
- Committer:
- Sissors
- Date:
- 2014-06-28
- Revision:
- 8:68082fdde730
- Child:
- 10:afc3b84dbbd6
File content as of revision 8:68082fdde730:
#ifdef TARGET_LPC11UXX #include "FastAnalogIn.h" static inline int div_round_up(int x, int y) { return (x + (y - 1)) / y; } #define LPC_IOCON0_BASE (LPC_IOCON_BASE) #define LPC_IOCON1_BASE (LPC_IOCON_BASE + 0x60) #define MAX_ADC_CLK 4500000 static const PinMap PinMap_ADC[] = { {P0_11, ADC0_0, 0x02}, {P0_12, ADC0_1, 0x02}, {P0_13, ADC0_2, 0x02}, {P0_14, ADC0_3, 0x02}, {P0_15, ADC0_4, 0x02}, {P0_16, ADC0_5, 0x01}, {P0_22, ADC0_6, 0x01}, {P0_23, ADC0_7, 0x01}, {NC , NC , 0 } }; static int channel_usage[8] = {0,0,0,0,0,0,0,0}; FastAnalogIn::FastAnalogIn(PinName pin, bool enabled) { ADCnumber = (ADCName)pinmap_peripheral(pin, PinMap_ADC); if (ADCnumber == (uint32_t)NC) error("ADC pin mapping failed"); datareg = (uint32_t*) (&LPC_ADC->DR0 + ADCnumber); // Power up ADC LPC_SYSCON->PDRUNCFG &= ~ (1 << 4); LPC_SYSCON->SYSAHBCLKCTRL |= ((uint32_t)1 << 13); uint32_t pin_number = (uint32_t)pin; __IO uint32_t *reg = (pin_number < 32) ? (__IO uint32_t*)(LPC_IOCON0_BASE + 4 * pin_number) : (__IO uint32_t*)(LPC_IOCON1_BASE + 4 * (pin_number - 32)); // set pin to ADC mode *reg &= ~(1 << 7); // set ADMODE = 0 (analog mode) uint32_t clkdiv = div_round_up(SystemCoreClock, MAX_ADC_CLK) - 1; LPC_ADC->CR = (0 << 0) // no channels selected | (clkdiv << 8) // max of 4.5MHz | (1 << 16) // BURST = 1, hardware controlled | ( 0 << 17 ); // CLKS = 0, we stick to 10 bit mode pinmap_pinout(pin, PinMap_ADC); //Enable channel running = false; enable(enabled); } void FastAnalogIn::enable(bool enabled) { //If currently not running if (!running) { if (enabled) { //Enable the ADC channel channel_usage[ADCnumber]++; LPC_ADC->CR |= (1<<ADCnumber); running = true; } else disable(); } } void FastAnalogIn::disable( void ) { //If currently running if (running) { channel_usage[ADCnumber]--; if (channel_usage[ADCnumber]==0) LPC_ADC->CR &= ~(1<<ADCnumber); } running = false; } unsigned short FastAnalogIn::read_u16( void ) { unsigned int retval; //If object is enabled return current value of datareg if (running) retval = *datareg; //If it isn't running, enable it and wait until new value is written to datareg else { //Force a read to clear done bit, enable the ADC channel retval = *datareg; enable(); //Wait until it is converted while(1) { retval = *datareg; if ((retval>>31) == 1) break; } //Disable again disable(); } //Do same thing as standard mbed lib, unused bit 0-3, replicate 4-7 in it retval &= ~0xFFFF003F; retval |= (retval >> 6) & 0x003F; return retval; } #endif //defined TARGET_LPC11UXX