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circuitpython/stmhal/dma.h

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stmhal: Factor out DMA initialisation code from spi.c. This is so that the DMA can be shared by multiple peripherals.
2015-06-10 08:06:48 -04:00
/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 Damien P. George
*
* 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.
*/
stmhal: L4: Adapt DMA to be able to support STM32L4 MCU series. The main thing is to change the DMA code in a way that the structure DMA_Stream_TypeDef (which is similar to DMA_Channel_TypeDef on stm32l4) is no longer used outside of dma.c, as this structure only exists for the F4 series. Therefore I introduced a new structure (dma_descr_t) which handles all DMA specific stuff for configuration. Further the periphery (spi, i2c, sdcard, dac) does not need to know the internals of the dma.
2016-03-22 06:28:35 -04:00
#ifndef __MICROPY_INCLUDED_STMHAL_DMA_H__
#define __MICROPY_INCLUDED_STMHAL_DMA_H__
typedef struct _dma_descr_t dma_descr_t;
#if defined(MCU_SERIES_F4) || defined(MCU_SERIES_F7)
extern const dma_descr_t dma_I2C_1_RX;
extern const dma_descr_t dma_SPI_3_RX;
extern const dma_descr_t dma_I2C_3_RX;
extern const dma_descr_t dma_I2C_2_RX;
extern const dma_descr_t dma_SPI_2_RX;
extern const dma_descr_t dma_SPI_2_TX;
extern const dma_descr_t dma_I2C_3_TX;
extern const dma_descr_t dma_DAC_1_TX;
extern const dma_descr_t dma_DAC_2_TX;
extern const dma_descr_t dma_SPI_3_TX;
extern const dma_descr_t dma_I2C_1_TX;
extern const dma_descr_t dma_I2C_2_TX;
extern const dma_descr_t dma_SPI_1_RX;
extern const dma_descr_t dma_SPI_5_RX;
extern const dma_descr_t dma_SDIO_0_RX;
extern const dma_descr_t dma_SPI_4_RX;
extern const dma_descr_t dma_SPI_5_TX;
extern const dma_descr_t dma_SPI_4_TX;
extern const dma_descr_t dma_SPI_6_TX;
extern const dma_descr_t dma_SPI_1_TX;
extern const dma_descr_t dma_SPI_6_RX;
extern const dma_descr_t dma_SDIO_0_TX;
#elif defined(MCU_SERIES_L4)
extern const dma_descr_t dma_ADC_1_RX;
extern const dma_descr_t dma_ADC_2_RX;
extern const dma_descr_t dma_SPI_1_RX;
extern const dma_descr_t dma_I2C_3_TX;
extern const dma_descr_t dma_ADC_3_RX;
extern const dma_descr_t dma_SPI_1_TX;
extern const dma_descr_t dma_I2C_3_RX;
extern const dma_descr_t dma_DAC_1_TX;
extern const dma_descr_t dma_SPI_2_RX;
extern const dma_descr_t dma_I2C_2_TX;
extern const dma_descr_t dma_DAC_2_TX;
extern const dma_descr_t dma_SPI_2_TX;
extern const dma_descr_t dma_I2C_2_RX;
extern const dma_descr_t dma_I2C_1_TX;
extern const dma_descr_t dma_I2C_1_RX;
extern const dma_descr_t dma_SPI_3_RX;
extern const dma_descr_t dma_SPI_3_TX;
extern const dma_descr_t dma_SDIO_1_TX;
#endif
stmhal: Turn off DMA clocks when idle for 100 msec Turning on each DMA block increases the current consumption by about 8 mA. This code adds an idle timer for each DMA block and turns off the clocks when no streams are in use for 128 msec. Having a small timeout allows for improved performance when back-to-back transfers are being performed. The 128 msec is basically a guess.
2015-11-15 20:02:43 -05:00
typedef union {
uint16_t enabled; // Used to test if both counters are == 0
uint8_t counter[2];
} dma_idle_count_t;
extern volatile dma_idle_count_t dma_idle;
#define DMA_IDLE_ENABLED() (dma_idle.enabled != 0)
stmhal: On SysTick IRQ, only process one DMA channel at a time. This can be generalised if/when more processing is needed by SysTick. Thanks to @chuckbook for the idea.
2015-11-24 10:40:59 -05:00
#define DMA_SYSTICK_MASK 0x0e
stmhal: Turn off DMA clocks when idle for 100 msec Turning on each DMA block increases the current consumption by about 8 mA. This code adds an idle timer for each DMA block and turns off the clocks when no streams are in use for 128 msec. Having a small timeout allows for improved performance when back-to-back transfers are being performed. The 128 msec is basically a guess.
2015-11-15 20:02:43 -05:00
#define DMA_MSECS_PER_SYSTICK (DMA_SYSTICK_MASK + 1)
#define DMA_IDLE_TICK_MAX (8) // 128 msec
#define DMA_IDLE_TICK(tick) (((tick) & DMA_SYSTICK_MASK) == 0)
stmhal/dma.c: Modify dma_init() to accept init struct as an argument This removes hard-coded DMA init params from dma_init(), instead defining these parameters in a DMA_InitTypeDef struct that gets passed as an argument to dma_init() This makes dma_init more generic so it can be used for I2S and SD Card, which require different initialization parameters.
2015-06-22 09:24:59 -04:00
stmhal: L4: Adapt DMA to be able to support STM32L4 MCU series. The main thing is to change the DMA code in a way that the structure DMA_Stream_TypeDef (which is similar to DMA_Channel_TypeDef on stm32l4) is no longer used outside of dma.c, as this structure only exists for the F4 series. Therefore I introduced a new structure (dma_descr_t) which handles all DMA specific stuff for configuration. Further the periphery (spi, i2c, sdcard, dac) does not need to know the internals of the dma.
2016-03-22 06:28:35 -04:00
void dma_init(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, void *data);
void dma_init_handle(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, void *data);
void dma_deinit(const dma_descr_t *dma_descr);
void dma_invalidate_channel(const dma_descr_t *dma_descr);
stmhal: On SysTick IRQ, only process one DMA channel at a time. This can be generalised if/when more processing is needed by SysTick. Thanks to @chuckbook for the idea.
2015-11-24 10:40:59 -05:00
void dma_idle_handler(int controller);
stmhal: L4: Adapt DMA to be able to support STM32L4 MCU series. The main thing is to change the DMA code in a way that the structure DMA_Stream_TypeDef (which is similar to DMA_Channel_TypeDef on stm32l4) is no longer used outside of dma.c, as this structure only exists for the F4 series. Therefore I introduced a new structure (dma_descr_t) which handles all DMA specific stuff for configuration. Further the periphery (spi, i2c, sdcard, dac) does not need to know the internals of the dma.
2016-03-22 06:28:35 -04:00
#endif //__MICROPY_INCLUDED_STMHAL_DMA_H__
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