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https://github.com/jhbruhn/eurorack.git
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109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
#pragma once
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#include "peripherals.h"
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#include "stmlib/stmlib.h"
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#include <stm32f0xx_hal.h>
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#include <stm32f0xx_ll_spi.h>
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namespace stereo_mix {
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GPIO_TypeDef* kOffsetDacPorts[] = { GPIOB, GPIOB, GPIOB, GPIOB };
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const uint16_t kOffsetDacPins[] = { GPIO_PIN_8, GPIO_PIN_9, GPIO_PIN_10, GPIO_PIN_11 };
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GPIO_TypeDef* kMDacPorts[] = { GPIOA, GPIOB, GPIOB, GPIOC };
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const uint16_t kMDacPins[] = { GPIO_PIN_15, GPIO_PIN_7, GPIO_PIN_15, GPIO_PIN_13 };
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class Dacs { // MCP4xx2 dac implementation
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public:
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Dacs()
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{
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__HAL_RCC_GPIOA_CLK_ENABLE();
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__HAL_RCC_GPIOB_CLK_ENABLE();
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__HAL_RCC_GPIOC_CLK_ENABLE();
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__HAL_RCC_SPI1_CLK_ENABLE();
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HAL_NVIC_SetPriority(SPI1_IRQn, 0, 0);
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HAL_NVIC_EnableIRQ(SPI1_IRQn);
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GPIO_InitTypeDef gpio_init;
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for (size_t i = 0; i < 8; i++) {
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// init SS/CS/RST GPIO
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uint16_t ssGpioPin;
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GPIO_TypeDef* ssGpioPort;
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if (i < 4) {
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ssGpioPin = kMDacPins[i];
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ssGpioPort = kMDacPorts[i];
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} else {
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ssGpioPin = kOffsetDacPins[i - 4];
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ssGpioPort = kOffsetDacPorts[i - 4];
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}
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gpio_init.Mode = GPIO_MODE_OUTPUT_PP;
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gpio_init.Speed = GPIO_SPEED_FREQ_HIGH;
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gpio_init.Pull = GPIO_NOPULL;
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gpio_init.Pin = ssGpioPin;
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HAL_GPIO_Init(ssGpioPort, &gpio_init);
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HAL_GPIO_WritePin(ssGpioPort, ssGpioPin, GPIO_PIN_SET);
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}
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// init AF GPIO
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gpio_init.Mode = GPIO_MODE_AF_PP;
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gpio_init.Speed = GPIO_SPEED_FREQ_HIGH;
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gpio_init.Pull = GPIO_NOPULL;
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gpio_init.Pin = GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5;
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gpio_init.Alternate = GPIO_AF0_SPI1;
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HAL_GPIO_Init(GPIOB, &gpio_init);
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// init SPI
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hspi1.Init.Direction = SPI_DIRECTION_2LINES;
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hspi1.Init.Mode = SPI_MODE_MASTER;
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hspi1.Init.DataSize = SPI_DATASIZE_16BIT;
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hspi1.Init.CLKPolarity = SPI_POLARITY_HIGH;
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hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
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hspi1.Init.NSS = SPI_NSS_SOFT;
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hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
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hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
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hspi1.Init.CRCPolynomial = 7;
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HAL_SPI_Init(&hspi1);
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SPI1->CR1 |= SPI_CR1_SPE; // this is required only once
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};
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void Write16(uint8_t device, uint8_t channel, uint16_t value, uint8_t gain, uint8_t buffered)
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{
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if (channel > 1)
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return; // only 2 channels available
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if (buffered > 1)
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return; // buffered can only be 0 or 1
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if (gain > 2 || gain < 1)
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return; // gain has to be 1 or 2
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gain = !(gain - 1);
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value >>= 4; // the dac supports a maximum of 12 bits precision
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value |= channel << 15; // select channel
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value |= buffered << 14; // set buffered
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value |= gain << 13; // set gain
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value |= 1 << 12; // shutdown always set to 1
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kMDacPorts[device]->BRR |= kMDacPins[device];
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SPI1->DR = value;
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while ((SPI1->SR & (SPI_SR_TXE | SPI_SR_BSY)) != SPI_SR_TXE)
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;
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kMDacPorts[device]->BSRR |= kMDacPins[device];
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kOffsetDacPorts[device]->BRR |= kOffsetDacPins[device];
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SPI1->DR = value;
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while ((SPI1->SR & (SPI_SR_TXE | SPI_SR_BSY)) != SPI_SR_TXE)
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;
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kOffsetDacPorts[device]->BSRR |= kOffsetDacPins[device];
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};
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void Write16(uint8_t device, uint8_t channel, uint16_t value)
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{
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Write16(device, channel, value, 1, 0);
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};
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};
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}
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