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stm32:dac: Fix waveform generation apis

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These were broken earlier, with no sane way of passing in correctly shifted
values, and didn't match examples.

Noticed while merging: https://github.com/libopencm3/libopencm3/pull/1281
This commit is contained in:
Karl Palsson
2021-01-26 22:31:06 +00:00
parent 8295d248e0
commit 0f1f1ebd1a
2 changed files with 44 additions and 38 deletions
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67
lib/stm32/common/dac_common_all.c
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@@ -66,8 +66,8 @@ sent out.
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO4);
rcc_periph_clock_enable(RCC_DAC);
dac_disable(DAC1, DAC_CHANNEL1);
dac_set_waveform_characteristics(DAC1, DAC_CR_MAMP1_8);
dac_set_waveform_generation(DAC1, DAC_CR_WAVE1_NOISE);
dac_set_waveform_characteristics(DAC1, DAC_CHANNEL1, DAC_CR_MAMP1_8);
dac_set_waveform_generation(DAC1, DAC_CHANNEL1, DAC_CR_WAVE1_NOISE);
dac_enable(DAC1, DAC_CHANNEL1);
dac_set_trigger_source(DAC1, DAC_CR_TSEL1_SW);
dac_load_data_buffer_single(DAC1, 0, DAC_ALIGN_RIGHT12, DAC_CHANNEL1);
@@ -289,46 +289,49 @@ void dac_set_trigger_source(uint32_t dac, uint32_t source)
DAC_CR(dac) |= source;
}
/** @brief Enable and Set DAC Channel Waveform Generation.
Enable the digital to analog converter waveform generation as either
pseudo-random noise or triangular wave. These signals are superimposed on
existing output values in the DAC output registers.
@note The DAC trigger must be enabled for this to work.
@param[in] dac the base address of the DAC. @ref dac_reg_base
@param[in] wave enum ::dac_wave. Taken from @ref dac_wave1_en or @ref
dac_wave2_en or a logical OR of one of each of these to set both channels
simultaneously.
*/
void dac_set_waveform_generation(uint32_t dac, enum dac_wave wave)
/**
* Set DAC Channel Waveform Generation mode for one or both channels.
* These signals are superimposed on existing output values in the
* DAC output registers. Waveform can be disabled, noise, triangular,
* or sawtooth, depending on family.
* @note The DAC trigger must be enabled for this to work.
* @param[in] dac the base address of the DAC. @ref dac_reg_base
* @param[in] channel one or both, @ref dac_channel_id
* @param[in] wave enum ::dac_wave. mode for channel
*/
void dac_set_waveform_generation(uint32_t dac, int channel, enum dac_wave wave)
{
DAC_CR(dac) |= wave;
}
/** @brief Disable DAC Channel Waveform Generation.
Disable a digital to analog converter channel superimposed waveform generation.
@param[in] dac the base address of the DAC. @ref dac_reg_base
@param[in] channel with DAC mask. @ref dac_channel_id
*/
void dac_disable_waveform_generation(uint32_t dac, int channel)
{
switch (channel) {
uint32_t reg = DAC_CR(dac);
switch(channel) {
case DAC_CHANNEL1:
DAC_CR(dac) &= ~(DAC_CR_WAVE1_MASK << DAC_CR_WAVE1_SHIFT);
reg &= ~(DAC_CR_WAVEx_MASK << DAC_CR_WAVE1_SHIFT);
reg |= wave << DAC_CR_WAVE1_SHIFT;
break;
case DAC_CHANNEL2:
DAC_CR(dac) &= ~(DAC_CR_WAVE2_MASK << DAC_CR_WAVE2_SHIFT);
reg &= ~(DAC_CR_WAVEx_MASK << DAC_CR_WAVE2_SHIFT);
reg |= wave << DAC_CR_WAVE2_SHIFT;
break;
case DAC_CHANNEL_BOTH:
DAC_CR(dac) &= ~(DAC_CR_WAVE1_MASK << DAC_CR_WAVE1_SHIFT)
| ~(DAC_CR_WAVE2_MASK << DAC_CR_WAVE2_SHIFT);
reg &= ~(DAC_CR_WAVEx_MASK << DAC_CR_WAVE1_SHIFT)
| ~(DAC_CR_WAVEx_MASK << DAC_CR_WAVE2_SHIFT);
reg |= wave << DAC_CR_WAVE1_SHIFT;
reg |= wave << DAC_CR_WAVE2_SHIFT;
break;
default:
break;
}
DAC_CR(dac) = reg;
}
/**
* Disable DAC Channel Waveform Generation.
* @note this is equivalent to @ref dac_set_waveform_generation (dac, channel, DAC_WAVE_DISABLE)
* @param[in] dac the base address of the DAC. @ref dac_reg_base
* @param[in] channel with DAC mask. @ref dac_channel_id
*/
void dac_disable_waveform_generation(uint32_t dac, int channel)
{
dac_set_waveform_generation(dac, channel, DAC_WAVE_DISABLE);
}
/** @brief Set DAC Channel LFSR Mask or Triangle Wave Amplitude.