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Implement 'smart' setVoltage function

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Jan-Henrik 2020-04-18 17:51:46 +02:00
parent 3f83d40ec8
commit 9d21a944d5
2 changed files with 32 additions and 2 deletions
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25
midi2cv/drivers/ad57x4.cc
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@ -1,8 +1,8 @@
#include "ad57x4.h" #include "ad57x4.h"
#include "peripherals.h" #include "peripherals.h"
#include "spi_mode.h" #include "spi_mode.h"
#include "stm32f3xx_hal_gpio.h"
#include <stm32f3xx_hal.h> #include <stm32f3xx_hal.h>
#include <math.h>
static const uint32_t kPinEnable = GPIO_PIN_5; static const uint32_t kPinEnable = GPIO_PIN_5;
@ -18,6 +18,29 @@ void AD57X4::Init()
HAL_GPIO_WritePin(GPIOB, kPinEnable, GPIO_PIN_SET); HAL_GPIO_WritePin(GPIOB, kPinEnable, GPIO_PIN_SET);
} }
void AD57X4::WriteVoltage(uint8_t dac, float voltage) {
VoltageRange range = VOLTAGE_RANGE_FIVE_VOLTS;
if(fabs(voltage) > 5) range = VOLTAGE_RANGE_TEN_VOLTS;
if(fabs(voltage) > 10) range = VOLTAGE_RANGE_TEN_EIGHT_VOLTS;
float multiplier = 2.0f;
if(range == VOLTAGE_RANGE_TEN_VOLTS) multiplier = 4.0f;
if(range == VOLTAGE_RANGE_TEN_EIGHT_VOLTS) multiplier = 4.32f;
float refin = 2.5f;
if(voltage < 0) {
// convert to signed value
int16_t value = (voltage / (multiplier * refin)) * (65535.0f);
this->WriteDacBipolar(dac, range, value);
} else {
// convert to unsigned value
uint16_t value = (voltage / (multiplier * refin)) * (65535.0f);
this->WriteDacUnipolar(dac, range, value);
}
}
void AD57X4::EnableAndSetRange(uint8_t dac, VoltageRange range, bool bipolar) void AD57X4::EnableAndSetRange(uint8_t dac, VoltageRange range, bool bipolar)
{ {
if (!(this->dacPower & (1 << dac))) { if (!(this->dacPower & (1 << dac))) {

9
midi2cv/drivers/ad57x4.h
View file

@ -3,6 +3,7 @@
#include "stmlib/stmlib.h" #include "stmlib/stmlib.h"
enum VoltageRange { enum VoltageRange {
VOLTAGE_RANGE_NONE = 4,
VOLTAGE_RANGE_FIVE_VOLTS = 0, VOLTAGE_RANGE_FIVE_VOLTS = 0,
VOLTAGE_RANGE_TEN_VOLTS = 1, VOLTAGE_RANGE_TEN_VOLTS = 1,
VOLTAGE_RANGE_TEN_EIGHT_VOLTS = 2 VOLTAGE_RANGE_TEN_EIGHT_VOLTS = 2
@ -17,10 +18,16 @@ enum Register {
class AD57X4 { class AD57X4 {
public: public:
AD57X4() {}; AD57X4()
{
for (size_t i = 0; i < 4; i++)
dacRange[i] = VOLTAGE_RANGE_NONE;
};
void Init(); void Init();
void WriteVoltage(uint8_t dac, float voltage); // smart range choosing!
void WriteDacBipolar(uint8_t dac, VoltageRange range, int16_t value); void WriteDacBipolar(uint8_t dac, VoltageRange range, int16_t value);
void WriteDacUnipolar(uint8_t dac, VoltageRange range, uint16_t value); void WriteDacUnipolar(uint8_t dac, VoltageRange range, uint16_t value);