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_F334R8/analogout_api.c
- Revision:
- 0:6bc4ac881c8e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F334R8/analogout_api.c Thu Jul 28 15:56:34 2016 +0000 @@ -0,0 +1,174 @@ +/* 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