mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F334R8/analogout_api.c
- Committer:
- shaoziyang
- Date:
- 2014-09-13
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 285:31249416b6f9
File content as of revision 323:9e901b0a5aa1:
/* mbed Microcontroller Library * Copyright (c) 2014, STMicroelectronics * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "mbed_assert.h" #include "analogout_api.h" #if DEVICE_ANALOGOUT #include "cmsis.h" #include "pinmap.h" #include "mbed_error.h" #define DAC_RANGE (0xFFF) // 12 bits static const PinMap PinMap_DAC[] = { {PA_4, DAC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // DAC1_OUT1 {PA_5, DAC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // DAC1_OUT2 (Warning: LED1 is also on this pin) {PA_6, DAC_2, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // DAC2_OUT1 {NC, NC, 0} }; static DAC_HandleTypeDef DacHandle; // These variables are used for the "free" function static int pa4_used = 0; static int pa5_used = 0; void analogout_init(dac_t *obj, PinName pin) { DAC_ChannelConfTypeDef sConfig; // Get the peripheral name (DAC_1, DAC_2...) from the pin and assign it to the object obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); MBED_ASSERT(obj->dac != (DACName)NC); // Configure GPIO pinmap_pinout(pin, PinMap_DAC); // Save the pin for future use obj->pin = pin; // Enable DAC clock if (obj->dac == DAC_1) { __DAC1_CLK_ENABLE(); } if (obj->dac == DAC_2) { __DAC2_CLK_ENABLE(); } // Configure DAC DacHandle.Instance = (DAC_TypeDef *)(obj->dac); sConfig.DAC_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE; if (pin == PA_4) { HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1); pa4_used = 1; } if (pin == PA_5) { HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2); pa5_used = 1; } if (pin == PA_6) { HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1); } analogout_write_u16(obj, 0); } void analogout_free(dac_t *obj) { // Reset DAC and disable clock if (obj->pin == PA_4) pa4_used = 0; if (obj->pin == PA_5) pa5_used = 0; if ((pa4_used == 0) && (pa5_used == 0)) { __DAC1_FORCE_RESET(); __DAC1_RELEASE_RESET(); __DAC1_CLK_DISABLE(); } if (obj->pin == PA_6) { __DAC2_FORCE_RESET(); __DAC2_RELEASE_RESET(); __DAC2_CLK_DISABLE(); } // Configure GPIO pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); } static inline void dac_write(dac_t *obj, uint16_t value) { if ((obj->pin == PA_4) || (obj->pin == PA_6)) { HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value); HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1); } if (obj->pin == PA_5) { HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, value); HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2); } } static inline int dac_read(dac_t *obj) { if ((obj->pin == PA_4) || (obj->pin == PA_6)) { return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1); } else if (obj->pin == PA_5) { return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2); } else { return 0; } } void analogout_write(dac_t *obj, float value) { if (value < 0.0f) { dac_write(obj, 0); // Min value } else if (value > 1.0f) { dac_write(obj, (uint16_t)DAC_RANGE); // Max value } else { dac_write(obj, (uint16_t)(value * (float)DAC_RANGE)); } } void analogout_write_u16(dac_t *obj, uint16_t value) { if (value > (uint16_t)DAC_RANGE) { dac_write(obj, (uint16_t)DAC_RANGE); // Max value } else { dac_write(obj, value); } } float analogout_read(dac_t *obj) { uint32_t value = dac_read(obj); return (float)((float)value * (1.0f / (float)DAC_RANGE)); } uint16_t analogout_read_u16(dac_t *obj) { return (uint16_t)dac_read(obj); } #endif // DEVICE_ANALOGOUT