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CommonAnalog.cpp
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/*
// This file is subject to the terms and conditions defined in
// file 'LICENSE.md', which is part of this source code package.
*/
#define PinMode Arduino_PinMode
#include "core-api/api/Common.h"
#undef PinMode
#include "core-extend/Common.h"
#include "sdk/core-extend/Common.h"
#include "sdk/core-extend/AnalogInternal.h"
#define AP3_ANALOG_CLK_SRC AM_HAL_CTIMER_HFRC_12MHZ
#define AP3_ANALOG_CLK_FREQ (12000000)
#define AP3_ANALOG_FRAME_PERIOD (24000)
#define AP3_MAX_ANALOG_WRITE_WIDTH (0x0000FFFF)
#define AP3_MIN_ANALOG_WRITE_WIDTH (0x03)
#define AP3_ANALOG_WRITE_RESOLUTION_MAX (16)
#define AP3_ANALOG_WRITE_RESOLUTION_MIN (1)
#define AP3_ANALOG_READ_RESOLUTION_MAX (16)
#define AP3_ANALOG_READ_RESOLUTION_MIN (1)
#define AP3_ADC_RESOLUTION (14)
int ap3_analog_read(ap3_adc_channel_config_t* config);
ap3_err_t ap3_pwm_output(ap3_gpio_pad_t pad, uint32_t th, uint32_t fw, uint32_t clk);
static uint8_t _analogReadResolution = 10;
static uint8_t _servoWriteResolution = 8;
static uint8_t _analogWriteResolution = 8;
static uint32_t _analogWriteWidth = 0x0000FFFF;
static void* g_ADCHandle;
bool adc_initialized = false;
ap3_adc_channel_config_t ap3_adc_channel_configs[] = {
{11, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE2, AM_HAL_PIN_11_ADCSE2, },
{12, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE9, AM_HAL_PIN_12_ADCD0NSE9, },
{13, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE8, AM_HAL_PIN_13_ADCD0PSE8, },
{16, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE0, AM_HAL_PIN_16_ADCSE0, },
{29, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE1, AM_HAL_PIN_29_ADCSE1, },
{31, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE3, AM_HAL_PIN_31_ADCSE3, },
{32, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE4, AM_HAL_PIN_32_ADCSE4, },
{33, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE5, AM_HAL_PIN_33_ADCSE5, },
{34, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE6, AM_HAL_PIN_34_ADCSE6, },
{35, AP3_ADC_INTERNAL_CHANNELS_NUM, AM_HAL_ADC_SLOT_CHSEL_SE7, AM_HAL_PIN_35_ADCSE7, },
{ 0, AP3_ADC_INTERNAL_CHANNELS_DIFF0, AM_HAL_ADC_SLOT_CHSEL_DF0, 0, },
{ 0, AP3_ADC_INTERNAL_CHANNELS_DIFF1, AM_HAL_ADC_SLOT_CHSEL_DF1, 0, },
{ 0, AP3_ADC_INTERNAL_CHANNELS_TEMP, AM_HAL_ADC_SLOT_CHSEL_TEMP, 0, },
{ 0, AP3_ADC_INTERNAL_CHANNELS_VCC_DIV3, AM_HAL_ADC_SLOT_CHSEL_BATT, 0, },
{ 0, AP3_ADC_INTERNAL_CHANNELS_VSS, AM_HAL_ADC_SLOT_CHSEL_VSS, 0, },
};
float getTempDegC( void ) {
const float v_ref = 2.0;
uint16_t counts = analogReadTemp();
//
// Convert and scale the temperature.
// Temperatures are in Fahrenheit range -40 to 225 degrees.
// Voltage range is 0.825V to 1.283V
// First get the ADC voltage corresponding to temperature.
//
float volts = ((float)counts) * v_ref / ((float)(pow(2, _analogReadResolution)));
float fVT[3];
fVT[0] = volts;
fVT[1] = 0.0f;
fVT[2] = -123.456;
uint32_t ui32Retval = am_hal_adc_control(g_ADCHandle, AM_HAL_ADC_REQ_TEMP_CELSIUS_GET, fVT);
MBED_ASSERT(ui32Retval == AM_HAL_STATUS_SUCCESS);
return fVT[1]; // Get the temperature
}
float getTempDegF( void ) {
float temp_deg_c = getTempDegC();
return ((9.0f/5.0f)*temp_deg_c) + 32.0f;
}
float getVCCV( void ){
return ((float)analogReadVCCDiv3() * 2.0) / 16384.0;
}
int indexAnalogRead(pin_size_t index){
// todo: replace with mbed "AnalogIn" functionality
pin_size_t pinNumber = pinNameByIndex(index);
if(pinNumber == (pin_size_t)NC){ return 0; }
ap3_adc_channel_config_t* config = NULL;
for(size_t idx = 0; idx < (sizeof(ap3_adc_channel_configs)/sizeof(ap3_adc_channel_config_t)); idx++){
if(ap3_adc_channel_configs[idx].pinNumber == pinNumber){
config = (ap3_adc_channel_configs + idx);
break;
}
}
if(!config){ return 0; }
return ap3_analog_read(config);
}
int analogReadDiff( uint32_t instance ){
ap3_adc_channel_config_t* config = NULL;
ap3_adc_internal_channel_e desired_internal_channel = (instance) ? AP3_ADC_INTERNAL_CHANNELS_DIFF1 : AP3_ADC_INTERNAL_CHANNELS_DIFF0;
for(size_t idx = 0; idx < (sizeof(ap3_adc_channel_configs)/sizeof(ap3_adc_channel_config_t)); idx++){
if(ap3_adc_channel_configs[idx].internal_channel == desired_internal_channel){
config = (ap3_adc_channel_configs + idx);
break;
}
}
if(!config){ return 0; }
return ap3_analog_read(config);
}
int analogReadTemp( void ){
ap3_adc_channel_config_t* config = NULL;
for(size_t idx = 0; idx < (sizeof(ap3_adc_channel_configs)/sizeof(ap3_adc_channel_config_t)); idx++){
if(ap3_adc_channel_configs[idx].internal_channel == AP3_ADC_INTERNAL_CHANNELS_TEMP){
config = (ap3_adc_channel_configs + idx);
break;
}
}
if(!config){ return 0; }
return ap3_analog_read(config);
}
int analogReadVCCDiv3( void ){
ap3_adc_channel_config_t* config = NULL;
for(size_t idx = 0; idx < (sizeof(ap3_adc_channel_configs)/sizeof(ap3_adc_channel_config_t)); idx++){
if(ap3_adc_channel_configs[idx].internal_channel == AP3_ADC_INTERNAL_CHANNELS_VCC_DIV3){
config = (ap3_adc_channel_configs + idx);
break;
}
}
if(!config){ return 0; }
return ap3_analog_read(config);
}
int analogReadVSS( void ){
ap3_adc_channel_config_t* config = NULL;
for(size_t idx = 0; idx < (sizeof(ap3_adc_channel_configs)/sizeof(ap3_adc_channel_config_t)); idx++){
if(ap3_adc_channel_configs[idx].internal_channel == AP3_ADC_INTERNAL_CHANNELS_VSS){
config = (ap3_adc_channel_configs + idx);
break;
}
}
if(!config){ return 0; }
return ap3_analog_read(config);
}
void indexAnalogWrite(pin_size_t index, int val){
// todo: replace with mbed "PwmOut" functionality
pin_size_t pinNumber = pinNameByIndex(index);
if(pinNumber == (pin_size_t)NC){ return; }
ap3_gpio_pad_t pad = pinNumber;
uint32_t clk = AP3_ANALOG_CLK_SRC;
uint32_t th = (uint32_t)((val * _analogWriteWidth) / ((0x01 << _analogWriteResolution) - 1));
ap3_pwm_output(pad, th, _analogWriteWidth, clk);
}
void indexTone(pin_size_t index, unsigned int frequency, unsigned long duration){
// todo: replace with mbed "PwmOut" functionality
pin_size_t pinNumber = pinNumberByIndex(index);
if(pinNumber == (pin_size_t)NC){ return; }
ap3_gpio_pad_t pad = pinNumber;
uint32_t clk = AP3_ANALOG_CLK_SRC;
uint32_t fw = 0;
if(!frequency){
ap3_pwm_output(pad, 0, 0, clk);
return;
}
if (frequency > 0){
fw = AP3_ANALOG_CLK_FREQ / frequency;
}
uint32_t th = fw / 2; // 50% time high
ap3_pwm_output(pad, th, fw, clk);
if(duration){
uint32_t stop_time = millis() + duration;
while(millis() < stop_time){};
}
ap3_pwm_output(pad, 0, 0, clk);
}
ap3_err_t analogWriteResolution(uint8_t bits){
if (bits > AP3_ANALOG_WRITE_RESOLUTION_MAX){
_analogWriteResolution = AP3_ANALOG_WRITE_RESOLUTION_MAX;
return AP3_ERR;
}
if (bits < AP3_ANALOG_WRITE_RESOLUTION_MIN){
_analogWriteResolution = AP3_ANALOG_WRITE_RESOLUTION_MIN;
return AP3_ERR;
}
_analogWriteResolution = bits;
return AP3_OK;
}
ap3_err_t analogWriteFrameWidth(uint32_t width){
if (width > AP3_MAX_ANALOG_WRITE_WIDTH){
_analogWriteWidth = AP3_MAX_ANALOG_WRITE_WIDTH;
return AP3_ERR;
}
_analogWriteWidth = width;
return AP3_OK;
}
ap3_err_t analogWriteFrequency(float freq){
uint32_t new_width = (uint32_t)(AP3_ANALOG_CLK_FREQ / freq);
if (new_width > AP3_MAX_ANALOG_WRITE_WIDTH){
return AP3_ERR;
}
if (new_width < AP3_MAX_ANALOG_WRITE_WIDTH){
return AP3_ERR;
}
_analogWriteWidth = new_width;
return AP3_OK;
}
ap3_err_t servoWriteResolution(uint8_t bits){
if (bits > AP3_ANALOG_WRITE_RESOLUTION_MAX){
_servoWriteResolution = AP3_ANALOG_WRITE_RESOLUTION_MAX;
return AP3_ERR;
}
if (bits < AP3_ANALOG_WRITE_RESOLUTION_MIN){
_servoWriteResolution = AP3_ANALOG_WRITE_RESOLUTION_MIN;
return AP3_ERR;
}
_servoWriteResolution = bits;
return AP3_OK;
}
uint8_t getServoResolution(){
return _servoWriteResolution;
}
ap3_err_t servoWrite(uint8_t pin, uint32_t val){
return (servoWrite(pin, val, 544, 2400)); //Call servoWrite with Arduino default min/max microseconds. See: https://www.arduino.cc/en/Reference/ServoAttach
}
ap3_err_t servoWrite(uint8_t pin, uint32_t val, uint16_t minMicros, uint16_t maxMicros){
// Determine the high time based on input value and the current resolution setting
uint32_t fsv = (0x01 << _servoWriteResolution); // full scale value for the current resolution setting
val = val % fsv; // prevent excess
uint32_t clk = AM_HAL_CTIMER_HFRC_3MHZ; // Using 3 MHz to get fine-grained control up to 20 ms wide
uint32_t fw = 60000; // 20 ms wide frame
//Convert microSeconds to PWM counts.
uint32_t min = minMicros * 3;
uint32_t max = maxMicros * 3;
uint32_t th = (uint32_t)(((max - min) * val) / fsv) + min;
return ap3_pwm_output(pin, th, fw, clk);
}
ap3_err_t analogReadResolution(uint8_t bits){
if(bits > AP3_ANALOG_READ_RESOLUTION_MAX){
_analogReadResolution = AP3_ANALOG_READ_RESOLUTION_MAX;
return AP3_ERR;
}
if(bits < AP3_ANALOG_READ_RESOLUTION_MIN){
_analogReadResolution = AP3_ANALOG_READ_RESOLUTION_MIN;
return AP3_ERR;
}
_analogReadResolution = bits;
return AP3_OK;
}
//*****************************************************************************
//
// Tables copied from am_hal_ctimer.c because they are declared as static within
// that file, but they would be useful here too.
//
// Lookup tables used by am_hal_ctimer_output_config().
//
// CTx_tbl[] relates the padnum and pad funcsel based on a given CTx.
// Valid pads for CTx are: 4-7, 11-13, 18-19, 22-33, 35, 37, 39, 42-49.
//
// outcfg_tbl[] contains attributes of the 4 output signal types for each
// of the 32 CTx signals. Therefore it is indexed by CTnumber 0-31.
// This table provides only the non-common OUTCFG attributes (2-5, other
// settings are shown below).
// OUTCFG 0 = Force output to 0.
// OUTCFG 1 = Force output to 1.
// OUTCFG 6 = A6OUT2.
// OUTCFG 7 = A7OUT2.
//
//*****************************************************************************
#define CTXPADNUM(ctx) ((CTx_tbl[ctx] >> 0) & 0x3f)
#define CTXPADFNC(ctx) ((CTx_tbl[ctx] >> 8) & 0x7)
#define CTX(pad, fn) ((fn << 8) | (pad << 0))
static const uint16_t CTx_tbl[32] =
{
CTX(12, 2), CTX(25, 2), CTX(13, 2), CTX(26, 2), CTX(18, 2), // 0 - 4
CTX(27, 2), CTX(19, 2), CTX(28, 2), CTX(5, 7), CTX(29, 2), // 5 - 9
CTX(6, 5), CTX(30, 2), CTX(22, 2), CTX(31, 2), CTX(23, 2), // 10 - 14
CTX(32, 2), CTX(42, 2), CTX(4, 6), CTX(43, 2), CTX(7, 7), // 15 - 19
CTX(44, 2), CTX(24, 5), CTX(45, 2), CTX(33, 6), CTX(46, 2), // 20 - 24
CTX(39, 2), CTX(47, 2), CTX(35, 5), CTX(48, 2), CTX(37, 7), // 25 - 29
CTX(49, 2), CTX(11, 2) // 30 - 31
};
#define OUTC(timB, timN, N2) ((N2 << 4) | (timB << 3) | (timN << 0))
#define OUTCTIMN(ctx, n) (outcfg_tbl[ctx][n] & (0x7 << 0))
#define OUTCTIMB(ctx, n) (outcfg_tbl[ctx][n] & (0x1 << 3))
#define OUTCO2(ctx, n) (outcfg_tbl[ctx][n] & (0x1 << 4))
static const uint8_t outcfg_tbl[32][4] =
{
{OUTC(0, 0, 0), OUTC(1, 2, 1), OUTC(0, 5, 1), OUTC(0, 6, 0)}, // CTX0: A0OUT, B2OUT2, A5OUT2, A6OUT
{OUTC(0, 0, 1), OUTC(0, 0, 0), OUTC(0, 5, 0), OUTC(1, 7, 1)}, // CTX1: A0OUT2, A0OUT, A5OUT, B7OUT2
{OUTC(1, 0, 0), OUTC(1, 1, 1), OUTC(1, 6, 1), OUTC(0, 7, 0)}, // CTX2: B0OUT, B1OUT2, B6OUT2, A7OUT
{OUTC(1, 0, 1), OUTC(1, 0, 0), OUTC(0, 1, 0), OUTC(0, 6, 0)}, // CTX3: B0OUT2, B0OUT, A1OUT, A6OUT
{OUTC(0, 1, 0), OUTC(0, 2, 1), OUTC(0, 5, 1), OUTC(1, 5, 0)}, // CTX4: A1OUT, A2OUT2, A5OUT2, B5OUT
{OUTC(0, 1, 1), OUTC(0, 1, 0), OUTC(1, 6, 0), OUTC(0, 7, 0)}, // CTX5: A1OUT2, A1OUT, B6OUT, A7OUT
{OUTC(1, 1, 0), OUTC(0, 1, 0), OUTC(1, 5, 1), OUTC(1, 7, 0)}, // CTX6: B1OUT, A1OUT, B5OUT2, B7OUT
{OUTC(1, 1, 1), OUTC(1, 1, 0), OUTC(1, 5, 0), OUTC(0, 7, 0)}, // CTX7: B1OUT2, B1OUT, B5OUT, A7OUT
{OUTC(0, 2, 0), OUTC(0, 3, 1), OUTC(0, 4, 1), OUTC(1, 6, 0)}, // CTX8: A2OUT, A3OUT2, A4OUT2, B6OUT
{OUTC(0, 2, 1), OUTC(0, 2, 0), OUTC(0, 4, 0), OUTC(1, 0, 0)}, // CTX9: A2OUT2, A2OUT, A4OUT, B0OUT
{OUTC(1, 2, 0), OUTC(1, 3, 1), OUTC(1, 4, 1), OUTC(0, 6, 0)}, // CTX10: B2OUT, B3OUT2, B4OUT2, A6OUT
{OUTC(1, 2, 1), OUTC(1, 2, 0), OUTC(1, 4, 0), OUTC(1, 5, 1)}, // CTX11: B2OUT2, B2OUT, B4OUT, B5OUT2
{OUTC(0, 3, 0), OUTC(1, 1, 0), OUTC(1, 0, 1), OUTC(1, 6, 1)}, // CTX12: A3OUT, B1OUT, B0OUT2, B6OUT2
{OUTC(0, 3, 1), OUTC(0, 3, 0), OUTC(0, 6, 0), OUTC(1, 4, 1)}, // CTX13: A3OUT2, A3OUT, A6OUT, B4OUT2
{OUTC(1, 3, 0), OUTC(1, 1, 0), OUTC(1, 7, 1), OUTC(0, 7, 0)}, // CTX14: B3OUT, B1OUT, B7OUT2, A7OUT
{OUTC(1, 3, 1), OUTC(1, 3, 0), OUTC(0, 7, 0), OUTC(0, 4, 1)}, // CTX15: B3OUT2, B3OUT, A7OUT, A4OUT2
{OUTC(0, 4, 0), OUTC(0, 0, 0), OUTC(0, 0, 1), OUTC(1, 3, 1)}, // CTX16: A4OUT, A0OUT, A0OUT2, B3OUT2
{OUTC(0, 4, 1), OUTC(1, 7, 0), OUTC(0, 4, 0), OUTC(0, 1, 1)}, // CTX17: A4OUT2, B7OUT, A4OUT, A1OUT2
{OUTC(1, 4, 0), OUTC(1, 0, 0), OUTC(0, 0, 0), OUTC(0, 3, 1)}, // CTX18: B4OUT, B0OUT, A0OUT, A3OUT2
{OUTC(1, 4, 1), OUTC(0, 2, 0), OUTC(1, 4, 0), OUTC(1, 1, 1)}, // CTX19: B4OUT2, A2OUT, B4OUT, B1OUT2
{OUTC(0, 5, 0), OUTC(0, 1, 0), OUTC(0, 1, 1), OUTC(1, 2, 1)}, // CTX20: A5OUT, A1OUT, A1OUT2, B2OUT2
{OUTC(0, 5, 1), OUTC(0, 1, 0), OUTC(1, 5, 0), OUTC(0, 0, 1)}, // CTX21: A5OUT2, A1OUT, B5OUT, A0OUT2
{OUTC(1, 5, 0), OUTC(0, 6, 0), OUTC(0, 1, 0), OUTC(0, 2, 1)}, // CTX22: B5OUT, A6OUT, A1OUT, A2OUT2
{OUTC(1, 5, 1), OUTC(0, 7, 0), OUTC(0, 5, 0), OUTC(1, 0, 1)}, // CTX23: B5OUT2, A7OUT, A5OUT, B0OUT2
{OUTC(0, 6, 0), OUTC(0, 2, 0), OUTC(0, 1, 0), OUTC(1, 1, 1)}, // CTX24: A6OUT, A2OUT, A1OUT, B1OUT2
{OUTC(1, 4, 1), OUTC(1, 2, 0), OUTC(0, 6, 0), OUTC(0, 2, 1)}, // CTX25: B4OUT2, B2OUT, A6OUT, A2OUT2
{OUTC(1, 6, 0), OUTC(1, 2, 0), OUTC(0, 5, 0), OUTC(0, 1, 1)}, // CTX26: B6OUT, B2OUT, A5OUT, A1OUT2
{OUTC(1, 6, 1), OUTC(0, 1, 0), OUTC(1, 6, 0), OUTC(1, 2, 1)}, // CTX27: B6OUT2, A1OUT, B6OUT, B2OUT2
{OUTC(0, 7, 0), OUTC(0, 3, 0), OUTC(0, 5, 1), OUTC(1, 0, 1)}, // CTX28: A7OUT, A3OUT, A5OUT2, B0OUT2
{OUTC(1, 5, 1), OUTC(0, 1, 0), OUTC(0, 7, 0), OUTC(0, 3, 1)}, // CTX29: B5OUT2, A1OUT, A7OUT, A3OUT2
{OUTC(1, 7, 0), OUTC(1, 3, 0), OUTC(0, 4, 1), OUTC(0, 0, 1)}, // CTX30: B7OUT, B3OUT, A4OUT2, A0OUT2
{OUTC(1, 7, 1), OUTC(0, 6, 0), OUTC(1, 7, 0), OUTC(1, 3, 1)}, // CTX31: B7OUT2, A6OUT, B7OUT, B3OUT2
};
uint32_t powerControlADC(bool on){
uint32_t status = AM_HAL_STATUS_SUCCESS;
if(on){
status = am_hal_adc_initialize(0, &g_ADCHandle);
if(status != AM_HAL_STATUS_SUCCESS){ return status; }
status = am_hal_adc_power_control(g_ADCHandle, AM_HAL_SYSCTRL_WAKE, false);
if(status != AM_HAL_STATUS_SUCCESS){ return status; }
adc_initialized = true;
}else{
adc_initialized = false;
status = am_hal_adc_disable(g_ADCHandle);
if(status != AM_HAL_STATUS_SUCCESS){ return status; }
status = am_hal_pwrctrl_periph_disable(AM_HAL_PWRCTRL_PERIPH_ADC);
if(status != AM_HAL_STATUS_SUCCESS){ return status; }
status = am_hal_adc_deinitialize(g_ADCHandle);
if(status != AM_HAL_STATUS_SUCCESS){ return status; }
}
return status;
}
uint32_t initializeADC( void ){
am_hal_adc_config_t ADCConfig;
// Power on the ADC.
powerControlADC(true);
// Set up the ADC configuration parameters. These settings are reasonable
// for accurate measurements at a low sample rate.
ADCConfig.eClock = AM_HAL_ADC_CLKSEL_HFRC;
ADCConfig.ePolarity = AM_HAL_ADC_TRIGPOL_RISING;
ADCConfig.eTrigger = AM_HAL_ADC_TRIGSEL_SOFTWARE;
ADCConfig.eReference = AM_HAL_ADC_REFSEL_INT_2P0;
ADCConfig.eClockMode = AM_HAL_ADC_CLKMODE_LOW_LATENCY;
ADCConfig.ePowerMode = AM_HAL_ADC_LPMODE0;
ADCConfig.eRepeat = AM_HAL_ADC_SINGLE_SCAN;
return am_hal_adc_configure(g_ADCHandle, &ADCConfig);
}
ap3_err_t ap3_config_channel(ap3_adc_channel_config_t* config){
am_hal_adc_slot_config_t ADCSlotConfig;
// Set up an ADC slot
ADCSlotConfig.eMeasToAvg = AM_HAL_ADC_SLOT_AVG_1;
ADCSlotConfig.ePrecisionMode = AM_HAL_ADC_SLOT_14BIT;
ADCSlotConfig.eChannel = config->eChannel;
ADCSlotConfig.bWindowCompare = false;
ADCSlotConfig.bEnabled = true;
if (AM_HAL_STATUS_SUCCESS != am_hal_adc_disable(g_ADCHandle)){
return AP3_ERR;
}
if (AM_HAL_STATUS_SUCCESS != am_hal_adc_configure_slot(g_ADCHandle, 0, &ADCSlotConfig)){
return AP3_ERR;
}
if (AM_HAL_STATUS_SUCCESS != am_hal_adc_enable(g_ADCHandle)){
return AP3_ERR;
}
return AP3_OK;
}
int ap3_analog_read(ap3_adc_channel_config_t* config){
if (!adc_initialized){
initializeADC();
}
uint32_t ui32IntMask;
am_hal_adc_sample_t Sample;
uint32_t ui32NumSamples = 1;
// configure the pin as an input if not an internal channel
// yes, configure on every analogRead - this is not much overhead in Arduino
if(config->internal_channel == AP3_ADC_INTERNAL_CHANNELS_NUM){
uint8_t funcsel = config->funcsel;
am_hal_gpio_pincfg_t pincfg = g_AM_HAL_GPIO_INPUT;
pincfg.uFuncSel = funcsel;
am_hal_gpio_pinconfig(config->pinNumber, pincfg);
}
ap3_config_channel(config);
// Clear the ADC interrupt.
am_hal_adc_interrupt_status(g_ADCHandle, &ui32IntMask, false);
MBED_ASSERT(AM_HAL_STATUS_SUCCESS == am_hal_adc_interrupt_clear(g_ADCHandle, ui32IntMask));
am_hal_adc_sw_trigger(g_ADCHandle);
do { // Wait for interrupt
MBED_ASSERT(AM_HAL_STATUS_SUCCESS == am_hal_adc_interrupt_status(g_ADCHandle, &ui32IntMask, false));
} while(!(ui32IntMask & AM_HAL_ADC_INT_CNVCMP));
MBED_ASSERT(AM_HAL_STATUS_SUCCESS == am_hal_adc_samples_read(g_ADCHandle, false, NULL, &ui32NumSamples, &Sample));
uint32_t result = Sample.ui32Sample;
// Shift result depending on resolution
return (_analogReadResolution > AP3_ADC_RESOLUTION) ? (result << (_analogReadResolution - AP3_ADC_RESOLUTION)) : (result >> (AP3_ADC_RESOLUTION - _analogReadResolution));
}
//**********************************************
// ap3_pwm_output
// - This function allows you to specify an arbitrary pwm output signal with a given frame width (fw) and time high (th).
// - Due to contraints of the hardware th must be lesser than fw by at least 2.
// - Furthermore fw must be at least 3 to see any high pulses
//
// This causes the most significant deviations for small values of fw. For example:
//
// th = 0, fw = 2 --> 0% duty cycle as expected
// th = 1, fw = 2 --> 100% duty cycle --- expected 50%, so 50% error ---
// th = 2, fw = 2 --> 100% duty cycle as expected
//
// th = 0, fw = 3 --> 0% duty cycle as expected
// th = 1, fw = 3 --> 33% duty cycle as expected
// th = 2, fw = 3 --> 100% duty cycle --- expected 66%, so 33% error ---
// th = 3, fw = 3 --> 100% duty cycle as expected
//
// th = 0, fw = 4 --> 0% duty cycle as expected
// th = 1, fw = 4 --> 25% duty cycle as expected
// th = 2, fw = 4 --> 50% duty cycle as expected
// th = 3, fw = 4 --> 100% duty cycle --- expected 75%, so 25% error ---
// th = 4, fw = 4 --> 100% duty cycle as expected
//
// ...
//
// Then we conclude that for the case th == (fw - 1) the duty cycle will be 100% and
// the percent error from the expected duty cycle will be 100/fw
//**********************************************
ap3_err_t ap3_pwm_output(ap3_gpio_pad_t pad, uint32_t th, uint32_t fw, uint32_t clk)
{
if (fw > 0)
{ // reduce fw so that the user's desired value is the period
fw--;
}
uint32_t timer = 0;
uint32_t segment = AM_HAL_CTIMER_TIMERA;
uint32_t output = AM_HAL_CTIMER_OUTPUT_NORMAL;
uint8_t ctx = 0;
for (ctx = 0; ctx < 32; ctx++)
{
if (CTXPADNUM(ctx) == pad)
{
break;
}
}
if (ctx >= 32)
{
return AP3_ERR; // could not find pad in CTx table
}
// Now use CTx index to get configuration information
// Now, for the given pad, determine the above values
if ((pad == 39) || (pad == 37))
{
// pads 39 and 37 must be handled differently to avoid conflicting with other pins
if (pad == 39)
{
// 39
timer = 6;
segment = AM_HAL_CTIMER_TIMERA;
output = AM_HAL_CTIMER_OUTPUT_SECONDARY;
}
else
{
// 37
timer = 7;
segment = AM_HAL_CTIMER_TIMERA;
output = AM_HAL_CTIMER_OUTPUT_SECONDARY;
}
}
else
{ // Use the 0th index of the outcfg_tbl to select the functions
timer = OUTCTIMN(ctx, 0);
if (OUTCTIMB(ctx, 0))
{
segment = AM_HAL_CTIMER_TIMERB;
}
if (OUTCO2(ctx, 0))
{
output = AM_HAL_CTIMER_OUTPUT_SECONDARY;
}
}
// Ensure that th is not greater than the fw
if (th > fw)
{
th = fw;
}
// Test for AM_HAL_CTIMER_OUTPUT_FORCE0 or AM_HAL_CTIMER_OUTPUT_FORCE1
bool set_periods = true;
if ((th == 0) || (fw == 0))
{
output = AM_HAL_CTIMER_OUTPUT_FORCE0;
set_periods = false; // disable setting periods when going into a forced mode
}
else if (th == fw)
{
output = AM_HAL_CTIMER_OUTPUT_FORCE1;
set_periods = false; // disable setting periods when going into a forced mode
}
// Configure the pin
am_hal_ctimer_output_config(timer,
segment,
pad,
output,
AM_HAL_GPIO_PIN_DRIVESTRENGTH_12MA); //
// if timer is running wait for timer value to roll over (will indicate that at least one pulse has been emitted)
AM_CRITICAL_BEGIN // critical section when reading / writing config registers
if ((segment == AM_HAL_CTIMER_TIMERA && *((uint32_t *)CTIMERADDRn(CTIMER, timer, CTRL0)) & (CTIMER_CTRL0_TMRA0EN_Msk)) ||
(segment == AM_HAL_CTIMER_TIMERB && *((uint32_t *)CTIMERADDRn(CTIMER, timer, CTRL0)) & (CTIMER_CTRL0_TMRB0EN_Msk)))
{
uint32_t current = 0;
uint32_t last = 0;
do
{
last = current;
current = am_hal_ctimer_read(timer, segment);
} while (current >= last);
}
AM_CRITICAL_END // end critical section
// clear timer (also stops the timer)
am_hal_ctimer_clear(timer, segment);
// Configure the repeated pulse mode with our clock source
am_hal_ctimer_config_single(timer,
segment,
// (AM_HAL_CTIMER_FN_PWM_REPEAT | AP3_ANALOG_CLK_SRC | AM_HAL_CTIMER_INT_ENABLE) );
(AM_HAL_CTIMER_FN_PWM_REPEAT | clk));
if (set_periods)
{
// If this pad uses secondary output:
if (output == AM_HAL_CTIMER_OUTPUT_SECONDARY)
{
// Need to explicitly enable compare registers 2/3
uint32_t *pui32ConfigReg = NULL;
pui32ConfigReg = (uint32_t *)CTIMERADDRn(CTIMER, timer, AUX0);
uint32_t ui32WriteVal = AM_REGVAL(pui32ConfigReg);
uint32_t ui32ConfigVal = (1 << CTIMER_AUX0_TMRA0EN23_Pos); // using CTIMER_AUX0_TMRA0EN23_Pos because for now this number is common to all CTimer instances
volatile uint32_t *pui32CompareRegA = (uint32_t *)CTIMERADDRn(CTIMER, timer, CMPRA0);
volatile uint32_t *pui32CompareRegB = (uint32_t *)CTIMERADDRn(CTIMER, timer, CMPRB0);
uint32_t masterPeriod = (uint32_t)(*(pui32CompareRegA)&CTIMER_CMPRA0_CMPR1A0_Msk) >> CTIMER_CMPRA0_CMPR1A0_Pos;
uint32_t masterRisingTrigger = (uint32_t)(*(pui32CompareRegA)&CTIMER_CMPRA0_CMPR0A0_Msk) >> CTIMER_CMPRA0_CMPR0A0_Pos;
if (segment == AM_HAL_CTIMER_TIMERB)
{
ui32ConfigVal = ((ui32ConfigVal & 0xFFFF) << 16);
masterPeriod = (uint32_t)(*(pui32CompareRegB)&CTIMER_CMPRB0_CMPR1B0_Msk) >> CTIMER_CMPRB0_CMPR1B0_Pos;
masterRisingTrigger = (uint32_t)(*(pui32CompareRegA)&CTIMER_CMPRB0_CMPR0B0_Msk) >> CTIMER_CMPRB0_CMPR0B0_Pos;
}
ui32WriteVal |= ui32ConfigVal;
AM_REGVAL(pui32ConfigReg) = ui32WriteVal;
if (masterPeriod != fw)
{
// the master output fw dictates the secondary fw... so if they are different try to change the master while preserving duty cycle
uint32_t masterTH = ((masterPeriod - masterRisingTrigger) * fw) / masterPeriod; // try to compensate in case _analogWriteWidth was changed
if (masterPeriod == 0)
{ // if masterPeriod was 0 then masterTH will be invalid (divide by 0). This usually means that the master timer output did not have a set duty cycle. This also means the output is probably not configured and so it is okay to choose an arbitrary duty cycle
masterTH = fw - 1;
}
am_hal_ctimer_period_set(timer, segment, fw, masterTH); // but this overwrites the non-aux compare regs for this timer / segment
// Serial.printf("th = %d, fw = %d, (masterPeriod - masterRisingTrigger) = (%d - %d) = %d\n", th, fw, masterPeriod, masterRisingTrigger, (masterPeriod - masterRisingTrigger));
}
// then set the duty cycle with the 'aux' function
am_hal_ctimer_aux_period_set(timer, segment, fw, th);
}
else
{
// Try to preserve settings of the secondary output
uint32_t *pui32ConfigReg = NULL;
pui32ConfigReg = (uint32_t *)CTIMERADDRn(CTIMER, timer, AUX0);
volatile uint32_t *pui32CompareRegA = (uint32_t *)CTIMERADDRn(CTIMER, timer, CMPRAUXA0);
volatile uint32_t *pui32CompareRegB = (uint32_t *)CTIMERADDRn(CTIMER, timer, CMPRAUXB0);
uint32_t slavePeriod = (uint32_t)(*(pui32CompareRegA)&CTIMER_CMPRA0_CMPR1A0_Msk) >> CTIMER_CMPRA0_CMPR1A0_Pos;
uint32_t slaveRisingTrigger = (uint32_t)(*(pui32CompareRegA)&CTIMER_CMPRA0_CMPR0A0_Msk) >> CTIMER_CMPRA0_CMPR0A0_Pos;
uint32_t auxEnabled = (AM_REGVAL(pui32ConfigReg) & CTIMER_AUX0_TMRA0EN23_Msk);
if (segment == AM_HAL_CTIMER_TIMERB)
{
auxEnabled = (AM_REGVAL(pui32ConfigReg) & (CTIMER_AUX0_TMRA0EN23_Msk << 16));
slavePeriod = (uint32_t)(*(pui32CompareRegB)&CTIMER_CMPRB0_CMPR1B0_Msk) >> CTIMER_CMPRB0_CMPR1B0_Pos;
slaveRisingTrigger = (uint32_t)(*(pui32CompareRegA)&CTIMER_CMPRB0_CMPR0B0_Msk) >> CTIMER_CMPRB0_CMPR0B0_Pos;
}
if (auxEnabled)
{ // if secondary outputs are enabled
if (slavePeriod != fw)
{ // and if fw is different from previous slavePeriod
uint32_t slaveTH = ((slavePeriod - slaveRisingTrigger) * fw) / slavePeriod; // try to compensate in case _analogWriteWidth was changed
if (slavePeriod == 0)
{ // if masterPeriod was 0 then masterTH will be invalid (divide by 0). This usually means that the master timer output did not have a set duty cycle. This also means the output is probably not configured and so it is okay to choose an arbitrary duty cycle
slaveTH = fw - 1;
}
am_hal_ctimer_aux_period_set(timer, segment, fw, slaveTH); // but this overwrites the non-aux compare regs for this timer / segment
}
}
// Now set the primary duty cycle
am_hal_ctimer_period_set(timer, segment, fw, th);
}
am_hal_ctimer_start(timer, segment); // Start the timer only when there are periods to compare to
}
return AP3_OK;
}