eurorack/stereo_mix/drivers/dac.h

104 lines
3.1 KiB
C
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#pragma once
#include <stm32f0xx.h>
#include "stm32f0xx_gpio.h"
#include "stmlib/stmlib.h"
#include <stm32f0xx_conf.h>
#include <stm32f0xx_rcc.h>
#include <stm32f0xx_spi.h>
class Dac { // MCP4xx2 dac implementation
public:
void Init(GPIO_TypeDef* ssGpioPort_, uint16_t ssGpioPin_)
{
ssGpioPort = ssGpioPort_;
ssGpioPin = ssGpioPin_;
// init SS/CS/RST GPIO
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_InitTypeDef gpio_init;
GPIO_StructInit(&gpio_init);
gpio_init.GPIO_Mode = GPIO_Mode_OUT;
gpio_init.GPIO_OType = GPIO_OType_PP;
gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Pin = ssGpioPin;
GPIO_Init(ssGpioPort, &gpio_init);
GPIO_SetBits(ssGpioPort, ssGpioPin);
// init AF GPIO
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_StructInit(&gpio_init);
gpio_init.GPIO_Mode = GPIO_Mode_AF;
gpio_init.GPIO_OType = GPIO_OType_PP;
gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_Init(GPIOB, &gpio_init);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_0);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_0);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_0);
// init SPI
SPI_I2S_DeInit(SPI1);
// Initialize SPI TODO: check which config we need
SPI_InitTypeDef spi_init;
SPI_StructInit(&spi_init);
spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
spi_init.SPI_Mode = SPI_Mode_Master;
spi_init.SPI_DataSize = SPI_DataSize_16b;
spi_init.SPI_CPOL = SPI_CPOL_High;
spi_init.SPI_CPHA = SPI_CPHA_1Edge;
spi_init.SPI_NSS = SPI_NSS_Soft;
spi_init.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
spi_init.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &spi_init);
SPI_Cmd(SPI1, ENABLE);
};
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
GPIO_ResetBits(ssGpioPort, ssGpioPin);
SPI_I2S_SendData16(SPI1, value);
//SPI_I2S_SendData16(SPI1, value); // MSB first, specified in config
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) {
asm("nop");
}
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET) {
asm("nop");
}
GPIO_SetBits(ssGpioPort, ssGpioPin);
};
void Write16(uint8_t channel, uint16_t value)
{
Write16(channel, value, 1, 0);
};
private:
GPIO_TypeDef* ssGpioPort;
uint16_t ssGpioPin;
};