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SPI: chip select can now be kept active if the bus has been acquired

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The user can now request the chip select to remain active after the current
transfer. In order to do so, he MUST acquire the bus first with `spi_device_acquire_bus()`
function, else, an error is returned.
This commit is contained in:
Omar Chebib
2021-05-13 11:53:44 +08:00
parent a1b5c38218
commit a6e14c37b2
9 changed files with 84 additions and 12 deletions
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8
components/driver/include/driver/spi_master.h
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@@ -105,7 +105,7 @@ typedef struct {
#define SPI_TRANS_VARIABLE_ADDR (1<<6) ///< Use the ``address_bits`` in ``spi_transaction_ext_t`` rather than default value in ``spi_device_interface_config_t``.
#define SPI_TRANS_VARIABLE_DUMMY (1<<7) ///< Use the ``dummy_bits`` in ``spi_transaction_ext_t`` rather than default value in ``spi_device_interface_config_t``.
#define SPI_TRANS_SET_CD (1<<7) ///< Set the CD pin
#define SPI_TRANS_CS_KEEP_ACTIVE (1<<8) ///< Keep CS active after data transfer
/**
* This structure describes one SPI transaction. The descriptor should not be modified until the transaction finishes.
*/
@@ -194,7 +194,8 @@ esp_err_t spi_bus_remove_device(spi_device_handle_t handle);
* @param ticks_to_wait Ticks to wait until there's room in the queue; use portMAX_DELAY to
* never time out.
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP_ERR_INVALID_ARG if parameter is invalid. This can happen if SPI_DEVICE_CS_KEEP_LOW flag is specified while
* the bus was not acquired (`spi_device_acquire_bus()` should be called first)
* - ESP_ERR_TIMEOUT if there was no room in the queue before ticks_to_wait expired
* - ESP_ERR_NO_MEM if allocating DMA-capable temporary buffer failed
* - ESP_ERR_INVALID_STATE if previous transactions are not finished
@@ -257,7 +258,8 @@ esp_err_t spi_device_transmit(spi_device_handle_t handle, spi_transaction_t *tra
* currently only portMAX_DELAY is supported.
*
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP_ERR_INVALID_ARG if parameter is invalid. This can happen if SPI_DEVICE_CS_KEEP_LOW flag is specified while
* the bus was not acquired (`spi_device_acquire_bus()` should be called first)
* - ESP_ERR_TIMEOUT if the device cannot get control of the bus before ``ticks_to_wait`` expired
* - ESP_ERR_NO_MEM if allocating DMA-capable temporary buffer failed
* - ESP_ERR_INVALID_STATE if previous transactions are not finished