1 // Copyright 2013 Emilie Gillet. 2 // 3 // Author: Emilie Gillet (emilie.o.gillet@gmail.com) 4 // 5 // Permission is hereby granted, free of charge, to any person obtaining a copy 6 // of this software and associated documentation files (the "Software"), to deal 7 // in the Software without restriction, including without limitation the rights 8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 // copies of the Software, and to permit persons to whom the Software is 10 // furnished to do so, subject to the following conditions: 11 // 12 // The above copyright notice and this permission notice shall be included in 13 // all copies or substantial portions of the Software. 14 // 15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 // THE SOFTWARE. 22 // 23 // See http://creativecommons.org/licenses/MIT/ for more information. 24 // 25 // ----------------------------------------------------------------------------- 26 // 27 // Driver for DAC. 28 29 #ifndef TIDES_DRIVERS_DAC_H_ 30 #define TIDES_DRIVERS_DAC_H_ 31 32 #include "stmlib/stmlib.h" 33 34 #include <stm32f10x_conf.h> 35 36 namespace tides { 37 38 const uint16_t kPinSS = GPIO_Pin_12; 39 40 class Dac { 41 public: Dac()42 Dac() { } ~Dac()43 ~Dac() { } 44 45 void Init(); 46 Write(uint16_t channel_1,uint16_t channel_2)47 void Write(uint16_t channel_1, uint16_t channel_2) { 48 data_[0] = channel_1; 49 data_[1] = channel_2; 50 } 51 ready()52 bool ready() { return active_channel_ == 0; } 53 Update()54 inline void Update() { 55 GPIOB->BSRR = kPinSS; 56 GPIOB->BRR = kPinSS; 57 if (active_channel_ == 0) { 58 SPI2->DR = 0x1000 | (data_[0] >> 8); 59 while (!(SPI2->SR & SPI_I2S_FLAG_RXNE)); 60 SPI2->DR = (data_[0] << 8) & 0xffff; 61 active_channel_ = 1; 62 } else { 63 SPI2->DR = 0x2400 | (data_[1] >> 8); 64 while (!(SPI2->SR & SPI_I2S_FLAG_RXNE)); 65 SPI2->DR = (data_[1] << 8) & 0xffff; 66 active_channel_ = 0; 67 } 68 } 69 Update(uint8_t channel)70 inline void Update(uint8_t channel) { 71 GPIOB->BSRR = kPinSS; 72 GPIOB->BRR = kPinSS; 73 if (channel == 0) { 74 SPI2->DR = 0x1000 | (data_[0] >> 8); 75 while (!(SPI2->SR & SPI_I2S_FLAG_RXNE)); 76 SPI2->DR = (data_[0] << 8) & 0xffff; 77 } else { 78 SPI2->DR = 0x2400 | (data_[1] >> 8); 79 while (!(SPI2->SR & SPI_I2S_FLAG_RXNE)); 80 SPI2->DR = (data_[1] << 8) & 0xffff; 81 } 82 } 83 84 private: 85 uint16_t data_[2]; 86 uint8_t active_channel_; 87 88 DISALLOW_COPY_AND_ASSIGN(Dac); 89 }; 90 91 } // namespace tides 92 93 #endif // TIDES_DRIVERS_DAC_H_ 94