eurorack/stereo_mix/drivers/dac.h

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#pragma once
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#include "peripherals.h"
#include "stm32f030x8.h"
#include "stmlib/stmlib.h"
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#include <stm32f0xx_hal.h>
namespace stereo_mix {
class Dac { // MCP4xx2 dac implementation
public:
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Dac(GPIO_TypeDef* ssGpioPort_, uint16_t ssGpioPin_)
: ssGpioPort(ssGpioPort_)
, ssGpioPin(ssGpioPin_)
{
ssGpioPort = ssGpioPort_;
ssGpioPin = ssGpioPin_;
// init SS/CS/RST GPIO
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__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitTypeDef gpio_init;
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gpio_init.Mode = GPIO_MODE_OUTPUT_PP;
gpio_init.Speed = GPIO_SPEED_FREQ_HIGH;
gpio_init.Pull = GPIO_NOPULL;
gpio_init.Pin = ssGpioPin;
HAL_GPIO_Init(ssGpioPort, &gpio_init);
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HAL_GPIO_WritePin(ssGpioPort, ssGpioPin, GPIO_PIN_SET);
// init AF GPIO
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gpio_init.Mode = GPIO_MODE_AF_PP;
gpio_init.Speed = GPIO_SPEED_FREQ_HIGH;
gpio_init.Pull = GPIO_NOPULL;
gpio_init.Pin = GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5;
gpio_init.Alternate = GPIO_AF0_SPI1;
HAL_GPIO_Init(GPIOB, &gpio_init);
// init SPI
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__HAL_RCC_SPI1_CLK_ENABLE();
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// HAL_SPI_DeInit(&spi);
// Initialize SPI TODO: check which config we need
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hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.DataSize = SPI_DATASIZE_16BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_HIGH;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.CRCPolynomial = 7;
HAL_SPI_Init(&hspi1);
};
void Write16(uint8_t channel, uint16_t value, uint8_t gain, uint8_t buffered)
{
if (channel > 1)
return; // only 2 channels available
if (buffered > 1)
return; // buffered can only be 0 or 1
if (gain > 2 || gain < 1)
return; // gain has to be 1 or 2
gain = !(gain - 1);
value >>= 4; // the dac supports a maximum of 12 bits precision
value |= channel << 15; // select channel
value |= buffered << 14; // set buffered
value |= gain << 13; // set gain
value |= 1 << 12; // shutdown always set to 1
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HAL_GPIO_WritePin(ssGpioPort, ssGpioPin, GPIO_PIN_RESET);
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HAL_SPI_Transmit(&hspi1, (uint8_t*)&value, 1, 1000);
//SPI_I2S_SendData16(SPI1, value); // MSB first, specified in config
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while (HAL_SPI_GetState(&hspi1) & HAL_SPI_STATE_BUSY) {
asm("nop");
}
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HAL_GPIO_WritePin(ssGpioPort, ssGpioPin, GPIO_PIN_SET);
};
void Write16(uint8_t channel, uint16_t value)
{
Write16(channel, value, 1, 0);
};
private:
GPIO_TypeDef* ssGpioPort;
uint16_t ssGpioPin;
};
}