See Quickstart guide for SAM SPI driver.
The SPI circuit is a synchronous serial data link that provides communication with external devices in Master or Slave mode. Connection to Peripheral DMA Controller channel capabilities optimizes data transfers.
Modules | |
| Related Project(s) | |
| In this section you can find all the projects related to the Serial Peripheral Interface (SPI). | |
| Quick Start Guide(s) | |
| In this section you can find a list of all Quick Start guides related to the Serial Peripheral Interface (SPI). | |
Macros | |
| #define | SPI_WPMR_WPKEY_PASSWD SPI_WPMR_WPKEY((uint32_t) 0x535049) |
Functions | |
| int16_t | spi_calc_baudrate_div (const uint32_t baudrate, uint32_t mck) |
| Calculate the baudrate divider. More... | |
| void | spi_configure_cs_behavior (Spi *p_spi, uint32_t ul_pcs_ch, uint32_t ul_cs_behavior) |
| Configure CS behavior for SPI transfer (spi_cs_behavior_t). More... | |
| void | spi_disable_clock (Spi *p_spi) |
| Disable SPI clock. More... | |
| void | spi_enable_clock (Spi *p_spi) |
| Enable SPI clock. More... | |
| uint32_t | spi_get_writeprotect_status (Spi *p_spi) |
| Indicate write protect status. More... | |
| spi_status_t | spi_read (Spi *p_spi, uint16_t *us_data, uint8_t *p_pcs) |
| Read the received data and it's peripheral chip select value. More... | |
| int16_t | spi_set_baudrate_div (Spi *p_spi, uint32_t ul_pcs_ch, uint8_t uc_baudrate_divider) |
| Set Serial Clock Baud Rate divider value (SCBR). More... | |
| void | spi_set_bits_per_transfer (Spi *p_spi, uint32_t ul_pcs_ch, uint32_t ul_bits) |
| Set number of bits per transfer. More... | |
| void | spi_set_clock_phase (Spi *p_spi, uint32_t ul_pcs_ch, uint32_t ul_phase) |
| Set Data Capture Phase. More... | |
| void | spi_set_clock_polarity (Spi *p_spi, uint32_t ul_pcs_ch, uint32_t ul_polarity) |
| Set clock default state. More... | |
| void | spi_set_delay_between_chip_select (Spi *p_spi, uint32_t ul_delay) |
| Set delay between chip selects (in number of MCK clocks). More... | |
| void | spi_set_peripheral_chip_select_value (Spi *p_spi, uint32_t ul_value) |
| Set Peripheral Chip Select (PCS) value. More... | |
| void | spi_set_transfer_delay (Spi *p_spi, uint32_t ul_pcs_ch, uint8_t uc_dlybs, uint8_t uc_dlybct) |
| Configure timing for SPI transfer. More... | |
| void | spi_set_writeprotect (Spi *p_spi, uint32_t ul_enable) |
| Enable or disable write protection of SPI registers. More... | |
| spi_status_t | spi_write (Spi *p_spi, uint16_t us_data, uint8_t uc_pcs, uint8_t uc_last) |
| Write the transmitted data with specified peripheral chip select value. More... | |
| #define SPI_WPMR_WPKEY_PASSWD SPI_WPMR_WPKEY((uint32_t) 0x535049) |
Referenced by spi_set_writeprotect().
| int16_t spi_calc_baudrate_div | ( | const uint32_t | baudrate, |
| uint32_t | mck | ||
| ) |
Calculate the baudrate divider.
| baudrate | Baudrate value. |
| mck | SPI module input clock frequency (MCK clock, Hz). |
| > | 0 Success. |
| < | 0 Error. |
References div_ceil.
Referenced by spi_master_setup_device().
| void spi_configure_cs_behavior | ( | Spi * | p_spi, |
| uint32_t | ul_pcs_ch, | ||
| uint32_t | ul_cs_behavior | ||
| ) |
Configure CS behavior for SPI transfer (spi_cs_behavior_t).
| p_spi | Pointer to an SPI instance. |
| ul_pcs_ch | Peripheral Chip Select channel (0~3). |
| ul_cs_behavior | Behavior of the Chip Select after transfer. |
References SPI_CS_KEEP_LOW, SPI_CS_RISE_FORCED, and SPI_CS_RISE_NO_TX.
Referenced by spi_master_setup_device().
| void spi_disable_clock | ( | Spi * | p_spi | ) |
Disable SPI clock.
| p_spi | Pointer to an SPI instance. |
References sysclk_disable_peripheral_clock(), and UNUSED.
| void spi_enable_clock | ( | Spi * | p_spi | ) |
Enable SPI clock.
| p_spi | Pointer to an SPI instance. |
References sysclk_enable_peripheral_clock(), and UNUSED.
Referenced by run_spi_ctrl_test(), spi_master_init(), spi_master_initialize(), and spi_slave_initialize().
| uint32_t spi_get_writeprotect_status | ( | Spi * | p_spi | ) |
Indicate write protect status.
| p_spi | Pointer to an SPI instance. |
Referenced by run_spi_writeprotect_test().
| spi_status_t spi_read | ( | Spi * | p_spi, |
| uint16_t * | us_data, | ||
| uint8_t * | p_pcs | ||
| ) |
Read the received data and it's peripheral chip select value.
While SPI works in fixed peripheral select mode, the peripheral chip select value is meaningless.
| p_spi | Pointer to an SPI instance. |
| data | Pointer to the location where to store the received data word. |
| p_pcs | Pointer to fill Peripheral Chip Select Value. |
| SPI_OK | on Success. |
| SPI_ERROR_TIMEOUT | on Time-out. |
References SPI_ERROR_TIMEOUT, spi_get_peripheral_select_mode(), SPI_OK, and SPI_TIMEOUT.
Referenced by run_spi_trans_test(), SPI_Handler(), spi_master_transfer(), trx_aes_wrrd(), trx_frame_read(), trx_frame_write(), trx_reg_read(), trx_reg_write(), trx_sram_read(), and trx_sram_write().
| int16_t spi_set_baudrate_div | ( | Spi * | p_spi, |
| uint32_t | ul_pcs_ch, | ||
| uint8_t | uc_baudrate_divider | ||
| ) |
Set Serial Clock Baud Rate divider value (SCBR).
| p_spi | Pointer to an SPI instance. |
| ul_pcs_ch | Peripheral Chip Select channel (0~3). |
| uc_baudrate_divider | Baudrate divider from MCK. |
| is | 0 Success. |
| is | -1 Error. |
Referenced by run_spi_trans_test(), spi_master_initialize(), and spi_master_setup_device().
| void spi_set_bits_per_transfer | ( | Spi * | p_spi, |
| uint32_t | ul_pcs_ch, | ||
| uint32_t | ul_bits | ||
| ) |
Set number of bits per transfer.
| p_spi | Pointer to an SPI instance. |
| ul_pcs_ch | Peripheral Chip Select channel (0~3). |
| ul_bits | Number of bits (8~16), use the pattern defined in the device header file. |
Referenced by run_spi_trans_test(), spi_master_initialize(), spi_master_setup_device(), and spi_slave_initialize().
| void spi_set_clock_phase | ( | Spi * | p_spi, |
| uint32_t | ul_pcs_ch, | ||
| uint32_t | ul_phase | ||
| ) |
Set Data Capture Phase.
| p_spi | Pointer to an SPI instance. |
| ul_pcs_ch | Peripheral Chip Select channel (0~3). |
| ul_phase | Data capture on the rising/falling edge of clock. |
Referenced by run_spi_trans_test(), spi_master_initialize(), spi_master_setup_device(), and spi_slave_initialize().
| void spi_set_clock_polarity | ( | Spi * | p_spi, |
| uint32_t | ul_pcs_ch, | ||
| uint32_t | ul_polarity | ||
| ) |
Set clock default state.
| p_spi | Pointer to an SPI instance. |
| ul_pcs_ch | Peripheral Chip Select channel (0~3). |
| ul_polarity | Default clock state is logical one(high)/zero(low). |
Referenced by run_spi_trans_test(), spi_master_initialize(), spi_master_setup_device(), and spi_slave_initialize().
| void spi_set_delay_between_chip_select | ( | Spi * | p_spi, |
| uint32_t | ul_delay | ||
| ) |
Set delay between chip selects (in number of MCK clocks).
If DLYBCS <= 6, 6 MCK clocks will be inserted by default.
| p_spi | Pointer to an SPI instance. |
| ul_delay | Delay between chip selects (in number of MCK clocks). |
Referenced by spi_master_init().
| void spi_set_peripheral_chip_select_value | ( | Spi * | p_spi, |
| uint32_t | ul_value | ||
| ) |
Set Peripheral Chip Select (PCS) value.
| p_spi | Pointer to an SPI instance. |
| ul_value | Peripheral Chip Select value. If PCS decode mode is not used, use spi_get_pcs to build the value to use. On reset the decode mode is not enabled. The decode mode can be enabled/disabled by follow functions: spi_enable_peripheral_select_decode, spi_disable_peripheral_select_decode. |
Referenced by run_spi_trans_test(), spi_deselect_device(), spi_master_init(), spi_master_initialize(), spi_select_device(), and spi_slave_initialize().
| void spi_set_transfer_delay | ( | Spi * | p_spi, |
| uint32_t | ul_pcs_ch, | ||
| uint8_t | uc_dlybs, | ||
| uint8_t | uc_dlybct | ||
| ) |
Configure timing for SPI transfer.
| p_spi | Pointer to an SPI instance. |
| ul_pcs_ch | Peripheral Chip Select channel (0~3). |
| uc_dlybs | Delay before SPCK (in number of MCK clocks). |
| uc_dlybct | Delay between consecutive transfers (in number of MCK clocks). |
Referenced by run_spi_trans_test(), spi_master_initialize(), and spi_master_setup_device().
| void spi_set_writeprotect | ( | Spi * | p_spi, |
| uint32_t | ul_enable | ||
| ) |
Enable or disable write protection of SPI registers.
| p_spi | Pointer to an SPI instance. |
| ul_enable | 1 to enable, 0 to disable. |
References SPI_WPMR_WPKEY_PASSWD.
Referenced by run_spi_writeprotect_test().
| spi_status_t spi_write | ( | Spi * | p_spi, |
| uint16_t | us_data, | ||
| uint8_t | uc_pcs, | ||
| uint8_t | uc_last | ||
| ) |
Write the transmitted data with specified peripheral chip select value.
| p_spi | Pointer to an SPI instance. |
| us_data | The data to transmit. |
| uc_pcs | Peripheral Chip Select Value while SPI works in peripheral select mode, otherwise it's meaningless. |
| uc_last | Indicate whether this data is the last one while SPI is working in variable peripheral select mode. |
| SPI_OK | on Success. |
| SPI_ERROR_TIMEOUT | on Time-out. |
References SPI_ERROR_TIMEOUT, spi_get_peripheral_select_mode(), SPI_OK, and SPI_TIMEOUT.
Referenced by run_spi_trans_test(), SPI_Handler(), spi_master_transfer(), spi_slave_transfer(), trx_aes_wrrd(), trx_frame_read(), trx_frame_write(), trx_reg_read(), trx_reg_write(), trx_sram_read(), and trx_sram_write().
1.8.5