#pragma once #include "peripherals.h" #include "stm32f030x8.h" #include "stmlib/stmlib.h" #include namespace stereo_mix { class Dac { // MCP4xx2 dac implementation public: Dac(GPIO_TypeDef* ssGpioPort_, uint16_t ssGpioPin_) : ssGpioPort(ssGpioPort_) , ssGpioPin(ssGpioPin_) { ssGpioPort = ssGpioPort_; ssGpioPin = ssGpioPin_; // init SS/CS/RST GPIO __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); GPIO_InitTypeDef gpio_init; 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); HAL_GPIO_WritePin(ssGpioPort, ssGpioPin, GPIO_PIN_SET); // init AF GPIO 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 __HAL_RCC_SPI1_CLK_ENABLE(); // HAL_SPI_DeInit(&spi); // Initialize SPI TODO: check which config we need 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 HAL_GPIO_WritePin(ssGpioPort, ssGpioPin, GPIO_PIN_RESET); HAL_SPI_Transmit(&hspi1, (uint8_t*)&value, 1, 1000); //SPI_I2S_SendData16(SPI1, value); // MSB first, specified in config while (HAL_SPI_GetState(&hspi1) & HAL_SPI_STATE_BUSY) { asm("nop"); } 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; }; }