/**
* \brief Access AES module with DMA support
*
* \note Read STATE using DMA channel 0.
* Check DMA driver example for more information about DMA usage.
*
*/
static void aes_dma_output(void)
{
// Make sure config is all zeroed out so we don't get any stray bits
memset(&config, 0, sizeof(config));
dma_enable();
dma_channel_set_burst_length(&config, DMA_CH_BURSTLEN_1BYTE_gc);
dma_channel_set_transfer_count(&config, BLOCK_LENGTH);
dma_channel_set_src_reload_mode(&config, DMA_CH_SRCRELOAD_NONE_gc);
dma_channel_set_dest_reload_mode(&config, DMA_CH_DESTRELOAD_NONE_gc);
dma_channel_set_src_dir_mode(&config, DMA_CH_SRCDIR_FIXED_gc);
dma_channel_set_dest_dir_mode(&config, DMA_CH_DESTDIR_INC_gc);
dma_channel_set_source_address(&config, (uint16_t)(uintptr_t)&AES_STATE);
dma_channel_set_destination_address(&config,
(uint16_t)(uintptr_t)single_ans);
dma_channel_write_config(DMA_CHANNEL_N, &config);
// Use the configuration above by enabling the DMA channel in use.
dma_channel_enable(DMA_CHANNEL_N);
/*
* Trigger a manual start since there is no trigger sources used in
* this example.
*/
dma_channel_trigger_block_transfer(DMA_CHANNEL_N);
while (!(DMA_CH0_CTRLB & DMA_CH_TRNIF_bm));
DMA_CH0_CTRLB |= DMA_CH_TRNIF_bm;
dma_disable();
}
/**
* \brief main function
*/
int main(void)
{
struct dma_channel_config config;
uint32_t checksum;
pmic_init();
board_init();
sysclk_init();
sleepmgr_init();
// Randomly selected data
source[0] = 0xAA;
source[1] = 0xBB;
source[2] = 0xCC;
source[3] = 0xDD;
source[4] = 0xEE;
source[5] = 0xFF;
// Calculate checksum for the data
checksum = crc_io_checksum((void*)source, 6, CRC_16BIT);
// Append the checksum to the data, big endian
crc16_append_value(checksum, source+6);
//Enable the CRC module for DMA
crc_dma_checksum_start(DMA_CHANNEL, CRC_16BIT);
// Enable DMA
dma_enable();
// Set callback function for DMA completion
dma_set_callback(DMA_CHANNEL, example_crc_dma_transfer_done);
// Make sure config is all zeroed out so we don't get any stray bits
memset(&config, 0, sizeof(config));
/**
* This example will configure a DMA channel with the following
* settings:
* - Low interrupt priority
* - 1 byte burst length
* - DMA_BUFFER_SIZE bytes for each transfer
* - Reload source and destination address at end of each transfer
* - Increment source and destination address during transfer
* - Source address is set to \ref source
* - Destination address is set to \ref destination
*/
dma_channel_set_interrupt_level(&config, PMIC_LVL_LOW);
dma_channel_set_burst_length(&config, DMA_CH_BURSTLEN_1BYTE_gc);
dma_channel_set_transfer_count(&config, DMA_BUFFER_SIZE);
dma_channel_set_src_reload_mode(&config,
DMA_CH_SRCRELOAD_TRANSACTION_gc);
dma_channel_set_dest_reload_mode(&config,
DMA_CH_DESTRELOAD_TRANSACTION_gc);
dma_channel_set_src_dir_mode(&config, DMA_CH_SRCDIR_INC_gc);
dma_channel_set_dest_dir_mode(&config, DMA_CH_DESTDIR_INC_gc);
dma_channel_set_source_address(&config, (uint16_t)(uintptr_t)source);
dma_channel_set_destination_address(&config,
(uint16_t)(uintptr_t)destination);
dma_channel_write_config(DMA_CHANNEL, &config);
// Use the configuration above by enabling the DMA channel in use.
dma_channel_enable(DMA_CHANNEL);
// Enable interrupts
cpu_irq_enable();
// Trigger the DMA transfer
dma_channel_trigger_block_transfer(DMA_CHANNEL);
// Light the first LED to indicate that the DMA has started.
gpio_set_pin_low(LED0_GPIO);
while (true) {
/*
* Force a NOP instruction for an eventual placement of a debug
* session breakpoint.
*/
asm("nop\n");
}
}
/**
*
* \brief Test double buffering mode
*
* \note This function tests the double buffering feature of the DMA
* controller by configuring channel 0 and 1 to do the same copy,
* and verify that the channels enable each other according to
* the double buffering process.
*
* \param test Current test case
*/
static void run_dma_double_buffering_test(const struct test_case *test)
{
struct dma_channel_config config_params;
bool success = true; /* Assume everything goes well */
/* 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(&config_params, 0, sizeof(config_params));
/* Enable DMA */
dma_enable();
/* Enable double buffering mode on channel 0 and 1 */
dma_set_double_buffer_mode(DMA_DBUFMODE_CH01_gc);
/* Set channel 1 to copy from memory_block_src to memory_block_dest */
dma_channel_set_src_reload_mode(&config_params,
DMA_CH_SRCRELOAD_NONE_gc);
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_INC_gc);
dma_channel_set_dest_reload_mode(&config_params,
DMA_CH_DESTRELOAD_NONE_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_INC_gc);
dma_channel_set_burst_length(&config_params,
DMA_CH_BURSTLEN_1BYTE_gc);
dma_channel_set_transfer_count(&config_params,
MEMORY_BLOCK_SIZE);
dma_channel_set_source_address(&config_params,
(uint16_t)(uintptr_t)memory_block_src);
dma_channel_set_destination_address(&config_params,
(uint16_t)(uintptr_t)memory_block_dest);
dma_channel_set_repeats(&config_params,
DOUBLE_BUFFER_REPEATS);
/* Write config and enable */
dma_channel_write_config(DMA_CHANNEL_0, &config_params);
dma_channel_write_config(DMA_CHANNEL_1, &config_params);
/* Enable only channel 0 */
dma_channel_enable(DMA_CHANNEL_0);
/* Transfer block and wait for it to finish */
dma_channel_trigger_block_transfer(DMA_CHANNEL_0);
while (dma_get_channel_status(DMA_CHANNEL_0) !=
DMA_CH_TRANSFER_COMPLETED) {
/* Intentionally left empty */
}
/*
* If double buffering is working, channel 1
* will be enabled now by the controller
*/
if (!(dma_channel_is_enabled(DMA_CHANNEL_1))) {
success = false;
}
/*
* Disable channel 0, transfer channel 1,
* and verify that channel 0 is enabled again by the controller
*/
dma_channel_disable(DMA_CHANNEL_0);
/* Transfer block and wait for it to finish */
dma_channel_trigger_block_transfer(DMA_CHANNEL_1);
while (dma_get_channel_status(DMA_CHANNEL_1) !=
DMA_CH_TRANSFER_COMPLETED) {
/* Intentionally left empty */
}
/* Verify that channel 0 is enabled again */
if (!(dma_channel_is_enabled(DMA_CHANNEL_0))) {
success = false;
}
test_assert_true(test, success,
"Double buffering mode did not function properly");
}
/**
* \brief Test read from fixed location, trigger from timer and callback
*
* \note This test sets up a timer to trigger the DMA module,
* which in turn reads the timer_overflow_counter variable and writes
* it to memory sequentially. It then checks to see that the memory block
* written is sequential according to the overflow count.
*
* \param test Current test
*/
static void run_dma_triggered_with_callback(const struct test_case *test)
{
struct dma_channel_config config_params;
bool success;
/* Null the buffer */
set_buffer(dest_block_tc, 0x0000);
/* Null out the config parameter struct */
memset(&config_params, 0, sizeof(config_params));
/*
* Enable the timer, and set it to count up.
* When it overflows, it triggers the DMA to
* read timer_overflow_counter. */
tc_enable(&TIMER);
tc_set_direction(&TIMER, TC_UP);
tc_write_period(&TIMER, TIMER_PERIOD);
tc_set_resolution(&TIMER, TIMER_RESOLUTION);
tc_set_overflow_interrupt_level(&TIMER, PMIC_LVL_LOW);
tc_set_overflow_interrupt_callback(&TIMER, timer_overflow_callback);
/* Enable the DMA module */
dma_enable();
/* Set callback for transfer done */
dma_set_callback(DMA_CHANNEL_0, dma_transfer_is_complete);
/* Set low interrupt level */
dma_channel_set_interrupt_level(&config_params, PMIC_LVL_LOW);
/* Set up the DMA to read the timer value
*
* - Single shot transfer mode
* - Two byte (16-bit) burst length
* - Increment on source and destination
* - Reload on burst for source
* - No reload for destination
*/
dma_channel_set_single_shot(&config_params);
dma_channel_set_burst_length(&config_params,
DMA_CH_BURSTLEN_1BYTE_gc);
dma_channel_set_src_reload_mode(&config_params,
DMA_CH_SRCRELOAD_BURST_gc);
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_FIXED_gc);
dma_channel_set_dest_reload_mode(&config_params,
DMA_CH_DESTRELOAD_NONE_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_INC_gc);
/* Set trigger source to TCC0's overflow */
dma_channel_set_trigger_source(&config_params,
DMA_CH_TRIGSRC_TCC0_OVF_gc);
/* Transfer DEST_BLOCK_TC_SIZE bytes */
dma_channel_set_transfer_count(&config_params,
DEST_BLOCK_TC_SIZE);
/* Set address */
dma_channel_set_source_address(&config_params,
(uint16_t)(uintptr_t)&timer_overflow_counter);
dma_channel_set_destination_address(&config_params,
(uint16_t)(uintptr_t)dest_block_tc);
/* Reset the channel */
dma_channel_reset(DMA_CHANNEL_0);
/* Write the config */
dma_channel_write_config(DMA_CHANNEL_0, &config_params);
/* Enable the channel */
dma_channel_enable(DMA_CHANNEL_0);
/* Wait for transfer to finish */
while (!dma_has_completed) {
/* Intentionally left empty */
}
/* Disable DMA */
dma_disable();
/* Verify that the result is as expected */
success = block_compare(dest_block_tc,
expected_result_tc, DEST_BLOCK_TC_SIZE);
test_assert_true(test, success, "Result is not as expected");
}
/**
*
* \brief Set DMA configuration, and read it back
*
* \note This function writes a configuration to the DMA
* controller, and reads it back to verify settings have
* been correctly set.
*
* \param test Current test case
*/
static void run_dma_config_interface_test(const struct test_case *test)
{
struct dma_channel_config config_params;
struct dma_channel_config read_config;
const uint16_t transfer_count = 1024;
const uint8_t repeats = 64;
uint8_t channel_index;
#ifdef CONFIG_HAVE_HUGEMEM
hugemem_ptr_t dest_huge_addr = HUGEMEM_NULL;
hugemem_ptr_t src_huge_addr = HUGEMEM_NULL;
hugemem_write32(dest_huge_addr, 0xABCD1234);
hugemem_write32(src_huge_addr, 0xAAAABBBB);
#else
const uint16_t dest_addr = 0xBEEF;
const uint16_t src_addr = 0xABCD;
#endif
memset(&config_params, 0, sizeof(config_params));
dma_enable();
/* Apply some parameters */
dma_channel_set_burst_length(&config_params,
DMA_CH_BURSTLEN_4BYTE_gc);
dma_channel_set_single_shot(&config_params);
dma_channel_set_interrupt_level(&config_params,
PMIC_LVL_HIGH);
dma_channel_set_src_reload_mode(&config_params,
DMA_CH_SRCRELOAD_BLOCK_gc);
dma_channel_set_dest_reload_mode(&config_params,
DMA_CH_DESTRELOAD_BURST_gc);
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_DEC_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_DEC_gc);
dma_channel_set_trigger_source(&config_params,
DMA_CH_TRIGSRC_TCC0_CCA_gc);
dma_channel_set_transfer_count(&config_params,
transfer_count);
dma_channel_set_repeats(&config_params,
repeats);
#ifdef CONFIG_HAVE_HUGEMEM
dma_channel_set_destination_hugemem(&config_params, dest_huge_addr);
dma_channel_set_source_hugemem(&config_params, src_huge_addr);
#else
dma_channel_set_destination_address(&config_params, dest_addr);
dma_channel_set_source_address(&config_params, src_addr);
#endif
/* Loop through all channels, read back config from them, and verify */
for (channel_index = 0; channel_index < DMA_NUMBER_OF_CHANNELS; channel_index++) {
dma_channel_write_config(channel_index, &config_params);
/* Null out the read_config struct */
memset(&read_config, 0, sizeof(read_config));
/* Read the config back from the module */
dma_channel_read_config(channel_index, &read_config);
test_assert_true(test,
read_config.addrctrl == config_params.addrctrl,
"CH %d: Address control register does not match configuration",
channel_index);
test_assert_true(test, read_config.ctrla == config_params.ctrla,
"CH %d: Control register A does not match configuration",
channel_index);
test_assert_true(test,
read_config.repcnt == config_params.repcnt,
"CH %d: Repeat counter register does not match configuration",
channel_index);
test_assert_true(test,
read_config.trfcnt == config_params.trfcnt,
"CH %d: Transfer counter register does not"
" match configuration", channel_index);
test_assert_true(test,
read_config.trigsrc == config_params.trigsrc,
"CH %d: Trigger source register does not match configuration",
channel_index);
#ifdef CONFIG_HAVE_HUGEMEM
test_assert_true(test,
read_config.destaddr == config_params.destaddr,
"CH %d: Destination address register does not"
" match configuration", channel_index);
test_assert_true(test,
read_config.srcaddr == config_params.srcaddr,
"CH %d: Source address register does not match configuration",
channel_index);
#else
test_assert_true(test,
read_config.destaddr16 == config_params.destaddr16,
"CH %d: DESTADDR16 does not match configuration",
channel_index);
test_assert_true(test,
read_config.srcaddr16 == config_params.srcaddr16,
"CH %d: SRCADDR16 does not match configuration");
#endif
}
/* Reset the channel */
dma_channel_reset(DMA_CHANNEL_0);
/* Check set and unset single shot */
memset(&config_params, 0, sizeof(config_params));
memset(&read_config, 0, sizeof(read_config));
dma_channel_set_single_shot(&config_params);
dma_channel_write_config(DMA_CHANNEL_0, &config_params);
dma_channel_read_config(DMA_CHANNEL_0, &read_config);
test_assert_true(test, read_config.ctrla == config_params.ctrla,
"Single shot mode not set correctly");
memset(&config_params, 0, sizeof(config_params));
dma_channel_unset_single_shot(&config_params);
dma_channel_write_config(DMA_CHANNEL_0, &config_params);
dma_channel_read_config(DMA_CHANNEL_0, &read_config);
test_assert_true(test, read_config.ctrla == config_params.ctrla,
"Single shot mode not unset correctly");
/* Reset it again, and test the direct configuration functions */
memset(&read_config, 0, sizeof(read_config));
dma_channel_write_burst_length(DMA_CHANNEL_0, DMA_CH_BURSTLEN_4BYTE_gc);
dma_channel_write_transfer_count(DMA_CHANNEL_0, transfer_count);
dma_channel_write_repeats(DMA_CHANNEL_0, repeats);
#ifdef CONFIG_HAVE_HUGEMEM
dma_channel_write_source_hugemem(DMA_CHANNEL_0, src_huge_addr);
dma_channel_write_destination_hugemem(DMA_CHANNEL_0, dest_huge_addr);
#else
dma_channel_write_source(DMA_CHANNEL_0, src_addr);
dma_channel_write_destination(DMA_CHANNEL_0, dest_addr);
#endif
/* Verify that settings have been set correctly */
dma_channel_read_config(DMA_CHANNEL_0, &read_config);
test_assert_true(test,
(read_config.ctrla & DMA_CH_BURSTLEN_gm)
== DMA_CH_BURSTLEN_4BYTE_gc,
"Read burst length does not match configuration");
test_assert_true(test, read_config.trfcnt == transfer_count,
"Read transfer count does not match configuration");
test_assert_true(test, read_config.repcnt == repeats,
"Read repeat value does not match configuration");
#ifdef CONFIG_HAVE_HUGEMEM
test_assert_true(test, read_config.srcaddr == src_huge_addr,
"Read source address does not match configuration");
test_assert_true(test, read_config.destaddr == dest_huge_addr,
"Read destination address does not match configuration");
#else
test_assert_true(test, read_config.srcaddr16 == src_addr,
"Read source address does not match configuration");
test_assert_true(test, read_config.destaddr16 == dest_addr,
"Read destination address does not match configuration");
#endif
dma_disable();
}
/**
* \brief Test different directions on all channels
*
* \note This test copies the source memory block into the destination block
* in different ways.
*
* \param test Current test
*/
static void run_dma_direction_test(const struct test_case *test)
{
struct dma_channel_config config_params;
uint8_t channel_index;
bool success = true; /* Assume everything goes well */
/* Fill the source block with our known pattern */
set_buffer(memory_block_src, 0x00);
block_fill(memory_block_src, MEMORY_BLOCK_SIZE);
/* Null out the config params */
memset(&config_params, 0, sizeof(config_params));
/* Enable DMA */
dma_enable();
/* No reload on source and destination */
dma_channel_set_src_reload_mode(&config_params,
DMA_CH_SRCRELOAD_NONE_gc);
dma_channel_set_dest_reload_mode(&config_params,
DMA_CH_DESTRELOAD_NONE_gc);
dma_channel_set_transfer_count(&config_params,
MEMORY_BLOCK_SIZE);
dma_channel_set_burst_length(&config_params,
DMA_CH_BURSTLEN_1BYTE_gc);
/* Test a memory transfer on all channels */
for (channel_index = 0; channel_index < DMA_NUMBER_OF_CHANNELS;
channel_index++) {
/* Reset channel and write the configuration */
dma_channel_reset(channel_index);
/* Increment source, increment destination */
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_INC_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_INC_gc);
/* Data starts from the first byte */
dma_channel_set_source_address(&config_params,
(uint16_t)(uintptr_t)memory_block_src);
dma_channel_set_destination_address(&config_params,
(uint16_t)(uintptr_t)memory_block_dest);
/* Write the config */
dma_channel_write_config(channel_index, &config_params);
/* Clear destination */
set_buffer(memory_block_dest, 0x00);
/* Enable channel, transfer, and disable it */
dma_channel_enable(channel_index);
dma_transfer_block(channel_index);
dma_channel_disable(channel_index);
/* Check that source and destination are equal */
success = block_compare(memory_block_src,
memory_block_dest, MEMORY_BLOCK_SIZE);
if (!success) {
break;
}
/* Reset channel and write the configuration */
dma_channel_reset(channel_index);
/* Decrement source, increment destination */
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_DEC_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_INC_gc);
/* Data starts from the first byte */
dma_channel_set_source_address(&config_params,
(uint16_t)(uintptr_t)
(memory_block_src + MEMORY_BLOCK_SIZE - 1));
dma_channel_set_destination_address(&config_params,
(uint16_t)(uintptr_t)memory_block_dest);
/* Write the config */
dma_channel_write_config(channel_index, &config_params);
/* Clear destination */
set_buffer(memory_block_dest, 0x00);
/* Enable channel, transfer, and disable it */
dma_channel_enable(channel_index);
dma_transfer_block(channel_index);
dma_channel_disable(channel_index);
/* Check that destination is the reverse of source */
success = block_compare_reverse(memory_block_src,
memory_block_dest, MEMORY_BLOCK_SIZE);
if (!success) {
break;
}
/* Reset channel and write the configuration */
dma_channel_reset(channel_index);
/* Decrement source, increment destination */
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_INC_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_DEC_gc);
/* Data starts from the first byte */
dma_channel_set_source_address(&config_params,
(uint16_t)(uintptr_t)memory_block_src);
dma_channel_set_destination_address(&config_params,
(uint16_t)(uintptr_t)
(memory_block_dest + MEMORY_BLOCK_SIZE - 1));
/* Write the config */
dma_channel_write_config(channel_index, &config_params);
/* Clear destination */
set_buffer(memory_block_dest, 0x00);
/* Enable channel, transfer, and disable it */
dma_channel_enable(channel_index);
dma_transfer_block(channel_index);
dma_channel_disable(channel_index);
/* Check that destination is the reverse of source */
success = block_compare_reverse(memory_block_src,
memory_block_dest, MEMORY_BLOCK_SIZE);
if (!success) {
break;
}
/* Reset channel and write the configuration */
dma_channel_reset(channel_index);
/* Decrement source, Decrement destination */
dma_channel_set_src_dir_mode(&config_params,
DMA_CH_SRCDIR_DEC_gc);
dma_channel_set_dest_dir_mode(&config_params,
DMA_CH_DESTDIR_DEC_gc);
/* Data starts from the first byte */
dma_channel_set_source_address(&config_params,
(uint16_t)(uintptr_t)
(memory_block_src + MEMORY_BLOCK_SIZE - 1));
dma_channel_set_destination_address(&config_params,
(uint16_t)(uintptr_t)
(memory_block_dest + MEMORY_BLOCK_SIZE - 1));
/* Write the config */
dma_channel_write_config(channel_index, &config_params);
/* Clear destination */
set_buffer(memory_block_dest, 0x00);
/* Enable channel, transfer, and disable it */
dma_channel_enable(channel_index);
dma_transfer_block(channel_index);
dma_channel_disable(channel_index);
/* Check that source and destination are equal */
success = block_compare(memory_block_src,
memory_block_dest, MEMORY_BLOCK_SIZE);
if (!success) {
break;
}
}
/* Disable DMA */
dma_disable();
test_assert_true(test, success,
"DMA direction copy test failed on channel %d",
channel_index);
}