mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/analogout_api.c
- Committer:
- shaoziyang
- Date:
- 2014-09-13
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 227:7bd0639b8911
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" #define DAC_RANGE (0xFFF) // 12 bits static const PinMap PinMap_DAC[] = { {PA_4, DAC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // DAC_OUT1 {NC, NC, 0} }; void analogout_init(dac_t *obj, PinName pin) { DAC_TypeDef *dac; DAC_InitTypeDef DAC_InitStructure; // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); MBED_ASSERT(obj->dac != (DACName)NC); dac = (DAC_TypeDef *)(obj->dac); // Configure GPIO pinmap_pinout(pin, PinMap_DAC); // Save the channel for future use obj->pin = pin; // Enable DAC clock RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); // Configure and enable DAC channel DAC_StructInit(&DAC_InitStructure); DAC_Init(dac, DAC_Channel_1, &DAC_InitStructure); DAC_Cmd(dac, DAC_Channel_1, ENABLE); analogout_write_u16(obj, 0); } void analogout_free(dac_t *obj) { DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac); // Disable DAC DAC_DeInit(dac); RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, DISABLE); // Configure GPIO pin_function(obj->pin, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF)); } static inline void dac_write(dac_t *obj, uint16_t value) { DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac); DAC_SetChannel1Data(dac, DAC_Align_12b_R, value); } static inline int dac_read(dac_t *obj) { DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac); return (int)DAC_GetDataOutputValue(dac, DAC_Channel_1); } 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