Adding support for SPI mode.

include/dev_fs_lib_spi.h

@@ -88,6 +88,7 @@ enum DSPAL_SPI_IOCTLS {
 	SPI_IOCTL_LOOPBACK_TEST,  /**< activate the internal loopback test mode of the spi bus */
 	SPI_IOCTL_RDWR,           /**< used to initiate a write/read batch transfer */
 	SPI_IOCTL_SET_BUS_FREQUENCY_IN_HZ,  /**< use this to set the SPI bus speed in HZ */
+	SPI_IOCTL_SET_SPI_MODE,   /**< use this to set the SPI mode */
 	SPI_IOCTL_MAX_NUM,        /**< number of valid IOCTL codes defined for the I2C bus */
 };
 
@@ -101,6 +102,23 @@ enum DSPAL_SPI_LOOPBACK_TEST_STATE {
 	SPI_LOOPBACK_STATE_ENABLED,      /**< specifies that the loopback state should be enabled */
 };
 
+/**
+* In the idle state whether the SPI clk is high or low.
+*/
+enum SPI_CLOCK_POLARITY_TYPE {
+   SPI_CLOCK_IDLE_LOW,	/**< CLK signal is low when idle.*/
+   SPI_CLOCK_IDLE_HIGH	/**< CLK signal is high when idle.*/
+};
+
+
+/**
+* Shift mode, detemines which signal (input or output) is sampled first.
+*/
+enum SPI_SHIFT_MODE_TYPE {
+   SPI_INPUT_FIRST,		/**< In both Master and slave input Bit is shifted in first.*/
+   SPI_OUTPUT_FIRST		/**< In both Master and slave  output Bit is shifted in first*/
+};
+
 /**
  * Callback function indicating that new data has been received and is ready to be read.
  * @param event
@@ -129,6 +147,19 @@ struct dspal_spi_ioctl_set_bus_frequency {
 	uint32_t bus_frequency_in_hz;  /**< the maximum speed of the bus for high speed data transfers */
 };
 
+/**
+ * Structure passed to the SPI_IOCTL_SET_SPI_MODE IOCTL call.  Specifies
+ * the SPI bus mode to the slave device. if not set, use the default mode 3.
+ */
+struct dspal_spi_ioctl_set_spi_mode {
+	enum SPI_CLOCK_POLARITY_TYPE eClockPolarity;/**< Clock polarity  type to be used for the SPI core.*/
+
+	   /* This parameter specifies whether the SPI core operates in OUTPUT
+	    * or INPUT FIRST Mode. This specifies whether the shift register
+	    * latches the DATA at the input pin on the rising or falling edge */
+	enum SPI_SHIFT_MODE_TYPE eShiftMode;/**< Shift mode type to be used for SPI core.*/
+};
+
 /**
  * Structure passed to the SPI_IOCTL_SET_OPTIONS IOCTL call.  Specifies certain SPI bus options and capabilities.
  *

test/dspal_tester/adsp_proc/spi_test_imp.c

@@ -126,6 +126,7 @@ int dspal_tester_spi_loopback_test(void)
 	int test_data_length_in_bytes = SPI_LOOPBACK_TEST_TRANSMIT_BUFFER_LENGTH - 1;
 	struct dspal_spi_ioctl_loopback loopback;
 	struct dspal_spi_ioctl_read_write read_write;
+	struct dspal_spi_ioctl_set_spi_mode bus_mode;
 
 	LOG_DEBUG("testing spi open for: %s", SPI_DEVICE_PATH);
 	spi_fildes = open(SPI_DEVICE_PATH, 0);
@@ -154,6 +155,15 @@ int dspal_tester_spi_loopback_test(void)
 		goto exit;
 	}
 
+	/* set bus mode, don't goto exit for downward compatible */
+	bus_mode.eClockPolarity = SPI_CLOCK_IDLE_HIGH;
+	bus_mode.eShiftMode = SPI_OUTPUT_FIRST;
+	result = ioctl(spi_fildes, SPI_IOCTL_SET_SPI_MODE, &bus_mode);
+	if (result < SUCCESS)
+	{
+		LOG_ERR("error: unable to set bus mode");
+	}
+
 	/*
 	 * Test loopback mode using combined read/write mode.
 	 */
@@ -204,6 +214,7 @@ int dspal_tester_spi_exceed_max_length_test(void)
 	uint8_t read_data_buffer[DSPAL_SPI_RECEIVE_BUFFER_LENGTH + 1];
 	struct dspal_spi_ioctl_loopback loopback;
 	struct dspal_spi_ioctl_read_write read_write;
+	struct dspal_spi_ioctl_set_spi_mode bus_mode;
 
 	LOG_DEBUG("testing spi open for: %s", SPI_DEVICE_PATH);
 	spi_fildes = open(SPI_DEVICE_PATH, 0);
@@ -226,6 +237,15 @@ int dspal_tester_spi_exceed_max_length_test(void)
 		goto exit;
 	}
 
+	/* set bus mode, don't goto exit for downward compatible */
+	bus_mode.eClockPolarity = SPI_CLOCK_IDLE_HIGH;
+	bus_mode.eShiftMode = SPI_OUTPUT_FIRST;
+	result = ioctl(spi_fildes, SPI_IOCTL_SET_SPI_MODE, &bus_mode);
+	if (result < SUCCESS)
+	{
+		LOG_ERR("error: unable to set bus mode");
+	}
+
 	read_write.read_buffer = &read_data_buffer[0];
 	read_write.read_buffer_length = sizeof(read_data_buffer);
 	read_write.write_buffer = &write_data_buffer[0];