#pragma once #include "peripherals.h" #include "stmlib/stmlib.h" #include #include namespace stereo_mix { GPIO_TypeDef* kOffsetDacPorts[] = { GPIOB, GPIOB, GPIOB, GPIOB }; const uint16_t kOffsetDacPins[] = { GPIO_PIN_8, GPIO_PIN_9, GPIO_PIN_10, GPIO_PIN_11 }; GPIO_TypeDef* kMDacPorts[] = { GPIOA, GPIOB, GPIOB, GPIOC }; const uint16_t kMDacPins[] = { GPIO_PIN_15, GPIO_PIN_7, GPIO_PIN_15, GPIO_PIN_13 }; class Dacs { // MCP4xx2 dac implementation public: Dacs() { __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_SPI1_CLK_ENABLE(); HAL_NVIC_SetPriority(SPI1_IRQn, 0, 0); HAL_NVIC_EnableIRQ(SPI1_IRQn); GPIO_InitTypeDef gpio_init; for (size_t i = 0; i < 8; i++) { // init SS/CS/RST GPIO uint16_t ssGpioPin; GPIO_TypeDef* ssGpioPort; if (i < 4) { ssGpioPin = kMDacPins[i]; ssGpioPort = kMDacPorts[i]; } else { ssGpioPin = kOffsetDacPins[i - 4]; ssGpioPort = kOffsetDacPorts[i - 4]; } 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 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_2; hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB; hspi1.Init.CRCPolynomial = 7; HAL_SPI_Init(&hspi1); SPI1->CR1 |= SPI_CR1_SPE; // this is required only once }; void Write16(uint8_t device, 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 kMDacPorts[device]->BRR |= kMDacPins[device]; SPI1->DR = value; while ((SPI1->SR & (SPI_SR_TXE | SPI_SR_BSY)) != SPI_SR_TXE) ; kMDacPorts[device]->BSRR |= kMDacPins[device]; kOffsetDacPorts[device]->BRR |= kOffsetDacPins[device]; SPI1->DR = value; while ((SPI1->SR & (SPI_SR_TXE | SPI_SR_BSY)) != SPI_SR_TXE) ; kOffsetDacPorts[device]->BSRR |= kOffsetDacPins[device]; }; void Write16(uint8_t device, uint8_t channel, uint16_t value) { Write16(device, channel, value, 1, 0); }; }; }