/**
* \brief Trigger and wait for a successful transfer
*
* \param channel_num Channel number
*/
static void ut_edma_transfer_block(edma_channel_num_t channel_num)
{
/* Trigger a EDMA copy */
edma_channel_trigger_block_transfer(channel_num);
/* Wait for it to finish */
while (edma_get_channel_status(channel_num) !=
EDMA_CH_TRANSFER_COMPLETED) {
/* Intentionally left empty */
}
}
/**
* \internal
* \brief Common EDMA channel interrupt handler
*
* Calls the channel callback with the channel status code. The following
* status codes are possible:
* - EDMA_CH_TRANSFER_COMPLETED: Transfer completed successfully
* - EDMA_CH_TRANSFER_ERROR: Fault in transfer
*
* The optional callback used by the interrupt handler is set by the
* edma_set_callback() function.
*
* \param num EDMA channel number to handle interrupt for
*/
static void edma_interrupt(const edma_channel_num_t num)
{
edma_channel_status_t status;
EDMA_CH_t *channel;
channel = edma_get_channel_address_from_num(num);
status = edma_get_channel_status(num);
/* Clear all interrupt flags to be sure */
channel->CTRLB |= EDMA_CH_TRNIF_bm | EDMA_CH_ERRIF_bm;
if (edma_data[num].callback) {
edma_data[num].callback(status);
}
}
/**
* \brief Test the error handling of the module
*
* \note Test error handling by disabling a channel which is in use
*
* \param test Current test
*/
static void run_edma_error_handling_test(const struct test_case *test)
{
/*
* Enable EDMA module, peripheral channels 0 and 1,
* standard channel 2
*/
edma_enable(EDMA_CHMODE_STD2_gc);
/* Reset the channel */
edma_channel_reset(EDMA_CH_2);
/* Set up channel 0 to do some work, check that is it busy,
* change some settings and verify a transfer error */
edma_channel_write_burst_length(EDMA_CH_2, EDMA_CH_BURSTLEN_1BYTE_gc);
edma_channel_write_transfer_count16(EDMA_CH_2, MEMORY_BLOCK_SIZE);
edma_channel_write_src_address(EDMA_CH_2,
(uint16_t)(uintptr_t)memory_block_src);
edma_channel_write_dest_address(EDMA_CH_2,
(uint16_t)(uintptr_t)memory_block_dest);
/* Enable the channel */
edma_channel_enable(EDMA_CH_2);
/* Start a block transfer */
edma_channel_trigger_block_transfer(EDMA_CH_2);
/* Wait for the channel to become busy */
while (!edma_channel_is_busy(EDMA_CH_2)) {
/* Intentionally left empty */
}
/* Disable the channel while it is busy */
if (edma_channel_is_busy(EDMA_CH_2)) {
edma_channel_disable(EDMA_CH_2);
}
/* Test whether the channel is in error */
test_assert_true(test,
edma_get_channel_status(
EDMA_CH_2) == EDMA_CH_TRANSFER_ERROR,
"EDMA channel not in ERROR after disabling during transfer write");
edma_disable();
}
/**
*
* \brief Test search and double buffering (link) modes
*
* \note This function tests search and double buffering features of the EDMA
* controller by configuring channel 2 searching data. In case of success, the
* channel 0 is automatically (double buffering) enables (if it is
* successfull) and copies a memory block. The copy is verified.
*
* \param test Current test case
*/
static void run_edma_search_dbuf_test(const struct test_case *test)
{
struct edma_channel_config ch0_config_params;
struct edma_channel_config ch2_config_params;
bool success;
/* Fill source block with pattern data */
set_buffer(memory_block_src, 0x00);
block_fill(memory_block_src, MEMORY_BLOCK_SIZE);
/* Null out the destination block */
set_buffer(memory_block_dest, 0x00);
/* Null out the config params */
memset(&ch0_config_params, 0, sizeof(ch0_config_params));
memset(&ch2_config_params, 0, sizeof(ch2_config_params));
/* Enable EDMA module, Channels 0 and 2 in standard configuration */
edma_enable(EDMA_CHMODE_STD02_gc);
/* Enable double buffering mode on channel 0 and 1 */
edma_set_double_buffer_mode(EDMA_DBUFMODE_BUF0123_gc);
/* Set channel 2 to search data (last byte of memory_block_src[]) */
edma_channel_set_src_reload_mode(&ch2_config_params,
EDMA_CH_RELOAD_NONE_gc);
edma_channel_set_src_dir_mode(&ch2_config_params, EDMA_CH_DIR_INC_gc);
edma_channel_set_dest_reload_mode(&ch2_config_params,
EDMA_CH_RELOAD_NONE_gc);
edma_channel_set_search_mode(&ch2_config_params,
EDMA_CH_DESTDIR_MP1_gc);
edma_channel_set_burst_length(&ch2_config_params,
EDMA_CH_BURSTLEN_1BYTE_gc);
edma_channel_set_trigger_source(&ch2_config_params,
EDMA_CH_TRIGSRC_OFF_gc);
edma_channel_set_transfer_count16(&ch2_config_params,
MEMORY_BLOCK_SIZE);
edma_channel_set_source_address(&ch2_config_params,
(uint16_t)(uintptr_t)memory_block_src);
edma_channel_set_search_data(&ch2_config_params,
memory_block_src[MEMORY_BLOCK_SIZE - 1], 0xFF);
/* Write config channel 2 */
edma_channel_write_config(EDMA_CH_2, &ch2_config_params);
/*
* Set channel 0 to copy from memory_block_src[] to memory_block_dest[]
* once a match will occur on channel 2. There will be no transfer if no
* match occurs.
*/
edma_channel_set_repeat(&ch0_config_params);
edma_channel_set_burst_length(&ch0_config_params,
EDMA_CH_BURSTLEN_2BYTE_gc);
edma_channel_set_src_reload_mode(&ch0_config_params,
EDMA_CH_RELOAD_TRANSACTION_gc);
edma_channel_set_dest_reload_mode(&ch0_config_params,
EDMA_CH_RELOAD_TRANSACTION_gc);
edma_channel_set_src_dir_mode(&ch0_config_params, EDMA_CH_DIR_INC_gc);
edma_channel_set_dest_dir_mode(&ch0_config_params,
EDMA_CH_DESTDIR_INC_gc);
edma_channel_set_trigger_source(&ch0_config_params,
EDMA_CH_TRIGSRC_OFF_gc);
edma_channel_set_transfer_count16(&ch0_config_params,
MEMORY_BLOCK_SIZE);
edma_channel_set_source_address(&ch0_config_params,
(uint16_t)(uintptr_t)memory_block_src);
edma_channel_set_destination_address(&ch0_config_params,
(uint16_t)(uintptr_t)memory_block_dest);
/* Write config channel 0 */
edma_channel_write_config(EDMA_CH_0, &ch0_config_params);
/* Enable only channel 2 */
edma_channel_enable(EDMA_CH_2);
/* Transfer block and wait for it to finish */
edma_channel_trigger_block_transfer(EDMA_CH_2);
edma_channel_trigger_block_transfer(EDMA_CH_0);
/* Wait for search completion */
while (edma_get_channel_status(EDMA_CH_2) !=
EDMA_CH_TRANSFER_COMPLETED) {
/* Intentionally left empty */
}
/* Wait for transfer completion */
while (edma_get_channel_status(EDMA_CH_0) !=
EDMA_CH_TRANSFER_COMPLETED) {
/* Intentionally left empty */
}
/* Disable EDMA */
edma_disable();
/* Verify that the search result is as expected */
success = block_compare(
edma_channel_get_search_pointer(EDMA_CH_2),
&memory_block_src[MEMORY_BLOCK_SIZE - 1], 1);
test_assert_true(test, success,
"SEARCH mode did not function properly");
/* Verify that the transfer result is as expected */
success = block_compare(memory_block_src, memory_block_dest,
MEMORY_BLOCK_SIZE);
test_assert_true(test, success,
"DOUBLE BUFFER mode did not function properly");
}