diff options
Diffstat (limited to 'stmhal/dac.c')
| -rw-r--r-- | stmhal/dac.c | 54 |
1 files changed, 33 insertions, 21 deletions
diff --git a/stmhal/dac.c b/stmhal/dac.c index 6d7491c314..7493bb59ab 100644 --- a/stmhal/dac.c +++ b/stmhal/dac.c @@ -67,7 +67,7 @@ /// dac = DAC(1) /// dac.write_timed(buf, 400 * len(buf), mode=DAC.CIRCULAR) -#if MICROPY_HW_ENABLE_DAC +#if defined(MICROPY_HW_ENABLE_DAC) && MICROPY_HW_ENABLE_DAC STATIC DAC_HandleTypeDef DAC_Handle; @@ -139,7 +139,7 @@ typedef enum { typedef struct _pyb_dac_obj_t { mp_obj_base_t base; uint32_t dac_channel; // DAC_CHANNEL_1 or DAC_CHANNEL_2 - DMA_Stream_TypeDef *dma_stream; // DMA1_Stream5 or DMA1_Stream6 + const dma_descr_t *tx_dma_descr; uint16_t pin; // GPIO_PIN_4 or GPIO_PIN_5 uint8_t bits; // 8 or 12 uint8_t state; @@ -162,7 +162,13 @@ STATIC mp_obj_t pyb_dac_init_helper(pyb_dac_obj_t *self, mp_uint_t n_args, const HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); // DAC peripheral clock + #if defined(MCU_SERIES_F4) || defined(MCU_SERIES_F7) __DAC_CLK_ENABLE(); + #elif defined(MCU_SERIES_L4) + __HAL_RCC_DAC1_CLK_ENABLE(); + #else + #error Unsupported Processor + #endif // stop anything already going on HAL_DAC_Stop(&DAC_Handle, self->dac_channel); @@ -217,11 +223,11 @@ STATIC mp_obj_t pyb_dac_make_new(const mp_obj_type_t *type, mp_uint_t n_args, mp if (dac_id == 1) { dac->pin = GPIO_PIN_4; dac->dac_channel = DAC_CHANNEL_1; - dac->dma_stream = DMA_STREAM_DAC1; + dac->tx_dma_descr = &dma_DAC_1_TX; } else if (dac_id == 2) { dac->pin = GPIO_PIN_5; dac->dac_channel = DAC_CHANNEL_2; - dac->dma_stream = DMA_STREAM_DAC2; + dac->tx_dma_descr = &dma_DAC_2_TX; } else { nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "DAC %d does not exist", dac_id)); } @@ -240,6 +246,21 @@ STATIC mp_obj_t pyb_dac_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *k } STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_dac_init_obj, 1, pyb_dac_init); +/// \method deinit() +/// Turn off the DAC, enable other use of pin. +STATIC mp_obj_t pyb_dac_deinit(mp_obj_t self_in) { + pyb_dac_obj_t *self = self_in; + if (self->dac_channel == DAC_CHANNEL_1) { + DAC_Handle.Instance->CR &= ~DAC_CR_EN1; + DAC_Handle.Instance->CR |= DAC_CR_BOFF1; + } else { + DAC_Handle.Instance->CR &= ~DAC_CR_EN2; + DAC_Handle.Instance->CR |= DAC_CR_BOFF2; + } + return mp_const_none; +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_dac_deinit_obj, pyb_dac_deinit); + #if defined(TIM6) /// \method noise(freq) /// Generate a pseudo-random noise signal. A new random sample is written @@ -371,9 +392,12 @@ mp_obj_t pyb_dac_write_timed(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_ __DMA1_CLK_ENABLE(); + DMA_HandleTypeDef DMA_Handle; + /* Get currently configured dma */ + dma_init_handle(&DMA_Handle, self->tx_dma_descr, (void*)NULL); /* - DMA_Cmd(self->dma_stream, DISABLE); - while (DMA_GetCmdStatus(self->dma_stream) != DISABLE) { + DMA_Cmd(DMA_Handle->Instance, DISABLE); + while (DMA_GetCmdStatus(DMA_Handle->Instance) != DISABLE) { } DAC_Cmd(self->dac_channel, DISABLE); @@ -389,18 +413,10 @@ mp_obj_t pyb_dac_write_timed(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_ DAC_Init(self->dac_channel, &DAC_InitStructure); */ - // DMA1_Stream[67] channel7 configuration - DMA_HandleTypeDef DMA_Handle; - DMA_Handle.Instance = self->dma_stream; - // Need to deinit DMA first DMA_Handle.State = HAL_DMA_STATE_READY; HAL_DMA_DeInit(&DMA_Handle); - DMA_Handle.Init.Channel = DMA_CHANNEL_DAC1; // DAC1 & DAC2 both use the same channel - DMA_Handle.Init.Direction = DMA_MEMORY_TO_PERIPH; - DMA_Handle.Init.PeriphInc = DMA_PINC_DISABLE; - DMA_Handle.Init.MemInc = DMA_MINC_ENABLE; if (self->bits == 8) { DMA_Handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; DMA_Handle.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; @@ -409,11 +425,6 @@ mp_obj_t pyb_dac_write_timed(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_ DMA_Handle.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; } DMA_Handle.Init.Mode = args[2].u_int; - DMA_Handle.Init.Priority = DMA_PRIORITY_HIGH; - DMA_Handle.Init.FIFOMode = DMA_FIFOMODE_DISABLE; - DMA_Handle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL; - DMA_Handle.Init.MemBurst = DMA_MBURST_SINGLE; - DMA_Handle.Init.PeriphBurst = DMA_PBURST_SINGLE; HAL_DMA_Init(&DMA_Handle); if (self->dac_channel == DAC_CHANNEL_1) { @@ -444,8 +455,8 @@ mp_obj_t pyb_dac_write_timed(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_ /* // enable DMA stream - DMA_Cmd(self->dma_stream, ENABLE); - while (DMA_GetCmdStatus(self->dma_stream) == DISABLE) { + DMA_Cmd(DMA_Handle->Instance, ENABLE); + while (DMA_GetCmdStatus(DMA_Handle->Instance) == DISABLE) { } // enable DAC channel @@ -465,6 +476,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_dac_write_timed_obj, 1, pyb_dac_write_time STATIC const mp_map_elem_t pyb_dac_locals_dict_table[] = { // instance methods { MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_dac_init_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&pyb_dac_deinit_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&pyb_dac_write_obj }, #if defined(TIM6) { MP_OBJ_NEW_QSTR(MP_QSTR_noise), (mp_obj_t)&pyb_dac_noise_obj }, |