mbed library sources
Dependents: FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/analogout_api.c
- Revision:
- 0:6bc4ac881c8e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/analogout_api.c Thu Jul 28 15:56:34 2016 +0000 @@ -0,0 +1,129 @@ +/* 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 RANGE_12BIT (0xFFF) + +static const PinMap PinMap_DAC[] = { + {PA_4, DAC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // DAC_OUT1 + {PA_5, DAC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // DAC_OUT2 + {NC, NC, 0} +}; + +void analogout_init(dac_t *obj, PinName pin) { + 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); + + // Configure GPIO + pinmap_pinout(pin, PinMap_DAC); + + // Save the pin for future use + obj->pin = pin; + + // Enable DAC clock + RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); + + // Configure and enable DAC channel + DAC_InitStructure.DAC_Trigger = DAC_Trigger_None; + DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None; + DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0; + DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; + + if (obj->pin == PA_4) { + DAC_Init(DAC_Channel_1, &DAC_InitStructure); + DAC_Cmd(DAC_Channel_1, ENABLE); + } + if (obj->pin == PA_5) { + DAC_Init(DAC_Channel_2, &DAC_InitStructure); + DAC_Cmd(DAC_Channel_2, ENABLE); + } + + analogout_write_u16(obj, 0); +} + +void analogout_free(dac_t *obj) { + // Configure GPIOs + 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) { + if (obj->pin == PA_4) { + DAC_SetChannel1Data(DAC_Align_12b_R, value); + } + if (obj->pin == PA_5) { + DAC_SetChannel2Data(DAC_Align_12b_R, value); + } +} + +static inline int dac_read(dac_t *obj) { + if (obj->pin == PA_4) { + return (int)DAC_GetDataOutputValue(DAC_Channel_1); + } + if (obj->pin == PA_5) { + return (int)DAC_GetDataOutputValue(DAC_Channel_2); + } + 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)RANGE_12BIT); // Max value + } else { + dac_write(obj, (uint16_t)(value * (float)RANGE_12BIT)); + } +} + +void analogout_write_u16(dac_t *obj, uint16_t value) { + if (value > (uint16_t)RANGE_12BIT) { + dac_write(obj, (uint16_t)RANGE_12BIT); // Max value + } else { + dac_write(obj, value); + } +} + +float analogout_read(dac_t *obj) { + uint32_t value = dac_read(obj); + return (float)value * (1.0f / (float)RANGE_12BIT); +} + +uint16_t analogout_read_u16(dac_t *obj) { + return (uint16_t)dac_read(obj); +} + +#endif // DEVICE_ANALOGOUT