stm32/dac: Add support for H7 MCUs.

Includes a fix for H7 DAC DMA requests.

ports/stm32/dac.c

@@ -65,6 +65,10 @@
 
 #if defined(MICROPY_HW_ENABLE_DAC) && MICROPY_HW_ENABLE_DAC
 
+#if defined(STM32H7)
+#define DAC DAC1
+#endif
+
 STATIC DAC_HandleTypeDef DAC_Handle;
 
 void dac_init(void) {
@@ -160,6 +164,8 @@ STATIC mp_obj_t pyb_dac_init_helper(pyb_dac_obj_t *self, size_t n_args, const mp
     // DAC peripheral clock
     #if defined(STM32F4) || defined(STM32F7)
     __DAC_CLK_ENABLE();
+    #elif defined(STM32H7)
+    __HAL_RCC_DAC12_CLK_ENABLE();
     #elif defined(STM32L4)
     __HAL_RCC_DAC1_CLK_ENABLE();
     #else
@@ -256,10 +262,14 @@ 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;
+        #ifndef STM32H7
         DAC_Handle.Instance->CR |= DAC_CR_BOFF1;
+        #endif
     } else {
         DAC_Handle.Instance->CR &= ~DAC_CR_EN2;
+        #ifndef STM32H7
         DAC_Handle.Instance->CR |= DAC_CR_BOFF2;
+        #endif
     }
     return mp_const_none;
 }

ports/stm32/dma.c

@@ -336,8 +336,8 @@ const dma_descr_t dma_SPI_2_TX = { DMA1_Stream4, DMA_REQUEST_SPI2_TX, DMA_MEMORY
 const dma_descr_t dma_I2C_3_TX = { DMA1_Stream4, DMA_REQUEST_I2C3_TX, DMA_MEMORY_TO_PERIPH, dma_id_4,   &dma_init_struct_spi_i2c };
 const dma_descr_t dma_I2C_4_TX = { DMA1_Stream5, BDMA_REQUEST_I2C4_TX, DMA_MEMORY_TO_PERIPH, dma_id_5,   &dma_init_struct_spi_i2c };
 #if defined(MICROPY_HW_ENABLE_DAC) && MICROPY_HW_ENABLE_DAC
-const dma_descr_t dma_DAC_1_TX = { DMA1_Stream5, DMA_REQUEST_DAC1_TX, DMA_MEMORY_TO_PERIPH, dma_id_5,   &dma_init_struct_dac };
-const dma_descr_t dma_DAC_2_TX = { DMA1_Stream6, DMA_REQUEST_DAC2_TX, DMA_MEMORY_TO_PERIPH, dma_id_6,   &dma_init_struct_dac };
+const dma_descr_t dma_DAC_1_TX = { DMA1_Stream5, DMA_REQUEST_DAC1_CH1, DMA_MEMORY_TO_PERIPH, dma_id_5,   &dma_init_struct_dac };
+const dma_descr_t dma_DAC_2_TX = { DMA1_Stream6, DMA_REQUEST_DAC1_CH2, DMA_MEMORY_TO_PERIPH, dma_id_6,   &dma_init_struct_dac };
 #endif
 const dma_descr_t dma_SPI_3_TX = { DMA1_Stream7, DMA_REQUEST_SPI3_TX, DMA_MEMORY_TO_PERIPH, dma_id_7,   &dma_init_struct_spi_i2c };
 const dma_descr_t dma_I2C_1_TX = { DMA1_Stream7, DMA_REQUEST_I2C1_TX, DMA_MEMORY_TO_PERIPH, dma_id_7,   &dma_init_struct_spi_i2c };