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spi_slave_hal_context_t struct
Context that should be maintained by both the driver and the HAL.
Syntax
typedef struct
{
spi_dev_t *hw;
spi_dma_desc_t *dmadesc_rx;
spi_dma_desc_t *dmadesc_tx;
int dmadesc_n;
struct {
uint32_t rx_lsbfirst : 1;
uint32_t tx_lsbfirst : 1;
uint32_t use_dma : 1;
};
int mode;
uint32_t bitlen;
const void *tx_buffer;
void *rx_buffer;
uint32_t rcv_bitlen;
} spi_slave_hal_context_t;
Fields
Field
Declared as
Description
Array of DMA descriptor used by the TX DMA. The amount should be larger than dmadesc_n. The driver should ensure that the data to be sent is shorter than the descriptors can hold.
Array of DMA descriptor used by the RX DMA. The amount should be larger than dmadesc_n. The driver should ensure that the data to be sent is shorter than the descriptors can hold.
uint32_t
const void *
Related Functions
Found 14 other functions taking a spi_slave_hal_context_t
argument:
Function
Description
Init the peripheral and the context.
Setup device-related configurations according to the settings in the context.
Rest peripheral registers to default value
Rest hw fifo in peripheral, for a CPU controlled trans
Push data needed to be transmit into hw fifo
Config transaction bit length for slave
Enable/Disable miso/mosi signals in peripheral
Trigger start a user-defined transaction.
Check whether the transaction is done (trans_done is set).
Post transaction operations, fetch data from the buffer and recorded the length.
Get the length of last transaction, in bits. Should be called after ``spi_slave_hal_store_result``. Note that if last transaction is longer than configured before, the return value still the actual length.
Check whether we need to reset the DMA according to the status of last transactions. In ESP32, sometimes we may need to reset the DMA for the slave before the next transaction. Call this to check it.
Deinit the peripheral (and the context if needed).
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