rp2__common_2hardware__dma_2include_2hardware_2dma_8h
dma.h File Reference
#include "pico.h"#include "hardware/structs/dma.h"#include "hardware/regs/dreq.h"#include "pico/assert.h"Go to the source code of this file.
Data Structures
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struct dma_channel_config
Macros
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#define DREQ_DMA_TIMER0 DMA_CH0_CTRL_TRIG_TREQ_SEL_VALUE_TIMER0
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#define DREQ_DMA_TIMER1 DMA_CH0_CTRL_TRIG_TREQ_SEL_VALUE_TIMER1
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#define DREQ_DMA_TIMER2 DMA_CH0_CTRL_TRIG_TREQ_SEL_VALUE_TIMER2
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#define DREQ_DMA_TIMER3 DMA_CH0_CTRL_TRIG_TREQ_SEL_VALUE_TIMER3
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#define DREQ_FORCE DMA_CH0_CTRL_TRIG_TREQ_SEL_VALUE_PERMANENT
Enumerations
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enum dma_channel_transfer_size { DMA_SIZE_8 = 0 , DMA_SIZE_16 = 1 , DMA_SIZE_32 = 2 }
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Enumeration of available DMA channel transfer sizes. More...
Functions
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static dma_channel_hw_t * dma_channel_hw_addr (uint channel)
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void dma_channel_claim (uint channel)
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Mark a dma channel as used.
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void dma_claim_mask (uint32_t channel_mask)
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Mark multiple dma channels as used.
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void dma_channel_unclaim (uint channel)
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Mark a dma channel as no longer used.
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void dma_unclaim_mask (uint32_t channel_mask)
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Mark multiple dma channels as no longer used.
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int dma_claim_unused_channel (bool required)
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Claim a free dma channel.
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bool dma_channel_is_claimed (uint channel)
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Determine if a dma channel is claimed.
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static void channel_config_set_read_increment (dma_channel_config *c, bool incr)
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Set DMA channel read increment in a channel configuration object.
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static void channel_config_set_write_increment (dma_channel_config *c, bool incr)
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Set DMA channel write increment in a channel configuration object.
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static void channel_config_set_dreq (dma_channel_config *c, uint dreq)
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Select a transfer request signal in a channel configuration object.
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static void channel_config_set_chain_to (dma_channel_config *c, uint chain_to)
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Set DMA channel chain_to channel in a channel configuration object.
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static void channel_config_set_transfer_data_size (dma_channel_config *c, enum dma_channel_transfer_size size)
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Set the size of each DMA bus transfer in a channel configuration object.
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static void channel_config_set_ring (dma_channel_config *c, bool write, uint size_bits)
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Set address wrapping parameters in a channel configuration object.
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static void channel_config_set_bswap (dma_channel_config *c, bool bswap)
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Set DMA byte swapping config in a channel configuration object.
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static void channel_config_set_irq_quiet (dma_channel_config *c, bool irq_quiet)
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Set IRQ quiet mode in a channel configuration object.
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static void channel_config_set_high_priority (dma_channel_config *c, bool high_priority)
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Set the channel priority in a channel configuration object.
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static void channel_config_set_enable (dma_channel_config *c, bool enable)
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Enable/Disable the DMA channel in a channel configuration object.
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static void channel_config_set_sniff_enable (dma_channel_config *c, bool sniff_enable)
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Enable access to channel by sniff hardware in a channel configuration object.
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static dma_channel_config dma_channel_get_default_config (uint channel)
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Get the default channel configuration for a given channel.
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static dma_channel_config dma_get_channel_config (uint channel)
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Get the current configuration for the specified channel.
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static uint32_t channel_config_get_ctrl_value (const dma_channel_config *config)
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Get the raw configuration register from a channel configuration.
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static void dma_channel_set_config (uint channel, const dma_channel_config *config, bool trigger)
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Set a channel configuration.
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static void dma_channel_set_read_addr (uint channel, const volatile void *read_addr, bool trigger)
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Set the DMA initial read address.
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static void dma_channel_set_write_addr (uint channel, volatile void *write_addr, bool trigger)
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Set the DMA initial write address.
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static void dma_channel_set_trans_count (uint channel, uint32_t trans_count, bool trigger)
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Set the number of bus transfers the channel will do.
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static void dma_channel_configure (uint channel, const dma_channel_config *config, volatile void *write_addr, const volatile void *read_addr, uint transfer_count, bool trigger)
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Configure all DMA parameters and optionally start transfer.
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static void dma_channel_transfer_from_buffer_now (uint channel, const volatile void *read_addr, uint32_t transfer_count)
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Start a DMA transfer from a buffer immediately.
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static void dma_channel_transfer_to_buffer_now (uint channel, volatile void *write_addr, uint32_t transfer_count)
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Start a DMA transfer to a buffer immediately.
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static void dma_start_channel_mask (uint32_t chan_mask)
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Start one or more channels simultaneously.
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static void dma_channel_start (uint channel)
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Start a single DMA channel.
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static void dma_channel_abort (uint channel)
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Stop a DMA transfer.
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static void dma_channel_set_irq0_enabled (uint channel, bool enabled)
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Enable single DMA channel's interrupt via DMA_IRQ_0.
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static void dma_set_irq0_channel_mask_enabled (uint32_t channel_mask, bool enabled)
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Enable multiple DMA channels' interrupts via DMA_IRQ_0.
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static void dma_channel_set_irq1_enabled (uint channel, bool enabled)
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Enable single DMA channel's interrupt via DMA_IRQ_1.
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static void dma_set_irq1_channel_mask_enabled (uint32_t channel_mask, bool enabled)
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Enable multiple DMA channels' interrupts via DMA_IRQ_1.
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static void dma_irqn_set_channel_enabled (uint irq_index, uint channel, bool enabled)
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Enable single DMA channel interrupt on either DMA_IRQ_0 or DMA_IRQ_1.
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static void dma_irqn_set_channel_mask_enabled (uint irq_index, uint32_t channel_mask, bool enabled)
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Enable multiple DMA channels' interrupt via either DMA_IRQ_0 or DMA_IRQ_1.
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static bool dma_channel_get_irq0_status (uint channel)
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Determine if a particular channel is a cause of DMA_IRQ_0.
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static bool dma_channel_get_irq1_status (uint channel)
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Determine if a particular channel is a cause of DMA_IRQ_1.
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static bool dma_irqn_get_channel_status (uint irq_index, uint channel)
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Determine if a particular channel is a cause of DMA_IRQ_N.
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static void dma_channel_acknowledge_irq0 (uint channel)
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Acknowledge a channel IRQ, resetting it as the cause of DMA_IRQ_0.
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static void dma_channel_acknowledge_irq1 (uint channel)
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Acknowledge a channel IRQ, resetting it as the cause of DMA_IRQ_1.
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static void dma_irqn_acknowledge_channel (uint irq_index, uint channel)
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Acknowledge a channel IRQ, resetting it as the cause of DMA_IRQ_N.
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static bool dma_channel_is_busy (uint channel)
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Check if DMA channel is busy.
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static void dma_channel_wait_for_finish_blocking (uint channel)
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Wait for a DMA channel transfer to complete.
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static void dma_sniffer_enable (uint channel, uint mode, bool force_channel_enable)
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Enable the DMA sniffing targeting the specified channel.
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static void dma_sniffer_set_byte_swap_enabled (bool swap)
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Enable the Sniffer byte swap function.
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static void dma_sniffer_set_output_invert_enabled (bool invert)
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Enable the Sniffer output invert function.
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static void dma_sniffer_set_output_reverse_enabled (bool reverse)
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Enable the Sniffer output bit reversal function.
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static void dma_sniffer_disable (void)
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Disable the DMA sniffer.
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static void dma_sniffer_set_data_accumulator (uint32_t seed_value)
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Set the sniffer's data accumulator with initial value.
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static uint32_t dma_sniffer_get_data_accumulator (void)
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Get the sniffer's data accumulator value.
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void dma_timer_claim (uint timer)
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Mark a dma timer as used.
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void dma_timer_unclaim (uint timer)
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Mark a dma timer as no longer used.
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int dma_claim_unused_timer (bool required)
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Claim a free dma timer.
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bool dma_timer_is_claimed (uint timer)
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Determine if a dma timer is claimed.
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static void dma_timer_set_fraction (uint timer, uint16_t numerator, uint16_t denominator)
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Set the divider for the given DMA timer.
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static uint dma_get_timer_dreq (uint timer_num)
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Return the DREQ number for a given DMA timer.
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void print_dma_ctrl (dma_channel_hw_t *channel)