6f91cfc425
Minor variations on F2: DMA underrun interrupts, and a status register to hold the notification bits. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/******************************************************************************
|
|
* The MIT License
|
|
*
|
|
* Copyright (c) 2010 Bryan Newbold.
|
|
* Copyright (c) 2011, 2012 LeafLabs, LLC.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person
|
|
* obtaining a copy of this software and associated documentation
|
|
* files (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use, copy,
|
|
* modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
* of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* @file libmaple/dac.c
|
|
* @brief Digital to analog converter support.
|
|
*/
|
|
|
|
#include <libmaple/dac.h>
|
|
#include <libmaple/libmaple.h>
|
|
#include <libmaple/gpio.h>
|
|
|
|
#if STM32_HAVE_DAC
|
|
dac_dev dac = {
|
|
.regs = DAC_BASE,
|
|
};
|
|
const dac_dev *DAC = &dac;
|
|
#endif
|
|
|
|
/**
|
|
* @brief Initialize the digital to analog converter
|
|
* @param dev DAC device
|
|
* @param flags Flags:
|
|
* DAC_CH1: Enable channel 1
|
|
* DAC_CH2: Enable channel 2
|
|
* @sideeffect May set PA4 or PA5 to INPUT_ANALOG
|
|
*/
|
|
void dac_init(const dac_dev *dev, uint32 flags) {
|
|
/* First turn on the clock */
|
|
rcc_clk_enable(RCC_DAC);
|
|
rcc_reset_dev(RCC_DAC);
|
|
|
|
if (flags & DAC_CH1) {
|
|
dac_enable_channel(dev, 1);
|
|
}
|
|
|
|
if (flags & DAC_CH2) {
|
|
dac_enable_channel(dev, 2);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Write a 12-bit value to the DAC to output
|
|
* @param dev DAC device
|
|
* @param channel channel to select (1 or 2)
|
|
* @param val value to write
|
|
*/
|
|
void dac_write_channel(const dac_dev *dev, uint8 channel, uint16 val) {
|
|
switch(channel) {
|
|
case 1:
|
|
dev->regs->DHR12R1 = DAC_DHR12R1_DACC1DHR & val;
|
|
break;
|
|
case 2:
|
|
dev->regs->DHR12R2 = DAC_DHR12R2_DACC2DHR & val;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Enable a DAC channel
|
|
* @param dev DAC device
|
|
* @param channel channel to enable, either 1 or 2
|
|
* @sideeffect May change pin mode of PA4 or PA5
|
|
*/
|
|
void dac_enable_channel(const dac_dev *dev, uint8 channel) {
|
|
/*
|
|
* Setup ANALOG mode on PA4 and PA5. This mapping is consistent
|
|
* across all supported STM32s with a DAC.
|
|
*/
|
|
switch (channel) {
|
|
case 1:
|
|
gpio_set_mode(GPIOA, 4, GPIO_MODE_ANALOG);
|
|
dev->regs->CR |= DAC_CR_EN1;
|
|
break;
|
|
case 2:
|
|
gpio_set_mode(GPIOA, 5, GPIO_MODE_ANALOG);
|
|
dev->regs->CR |= DAC_CR_EN2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Disable a DAC channel
|
|
* @param dev DAC device
|
|
* @param channel channel to disable, either 1 or 2
|
|
*/
|
|
void dac_disable_channel(const dac_dev *dev, uint8 channel) {
|
|
switch (channel) {
|
|
case 1:
|
|
dev->regs->CR &= ~DAC_CR_EN1;
|
|
break;
|
|
case 2:
|
|
dev->regs->CR &= ~DAC_CR_EN2;
|
|
break;
|
|
}
|
|
}
|