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tests: spi: loopback testing with NOCACHE MEMORY buffers for DMA

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This patch is defining Tx buffers in NON CACHE memory for using
with DMA transfers. This requires the CONFIG_NOCACHE_MEMORY=y
flag when mcu is using CACHE.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2021-06-09 09:46:36 +02:00 • committed by Christopher Friedt
commit dfc6611a31
1 changed files with 23 additions and 1 deletions
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24
tests/drivers/spi/spi_loopback/src/spi.c
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@ -38,12 +38,27 @@ struct spi_cs_control spi_cs = {
#define STACK_SIZE 512
#define BUF_SIZE 17
#define BUF2_SIZE 36
#if CONFIG_NOCACHE_MEMORY
static const char tx_data[] = "0123456789abcdef\0";
static __aligned(32) char buffer_tx[BUF_SIZE] __used
__attribute__((__section__(".nocache")));
static __aligned(32) char buffer_rx[BUF_SIZE] __used
__attribute__((__section__(".nocache")));
static const char tx2_data[] = "Thequickbrownfoxjumpsoverthelazydog\0";
static __aligned(32) char buffer2_tx[BUF2_SIZE] __used
__attribute__((__section__(".nocache")));
static __aligned(32) char buffer2_rx[BUF2_SIZE] __used
__attribute__((__section__(".nocache")));
#else
/* this src memory shall be in RAM to support using as a DMA source pointer.*/
uint8_t buffer_tx[] = "0123456789abcdef\0";
uint8_t buffer_rx[BUF_SIZE] = {};
#define BUF2_SIZE 36
uint8_t buffer2_tx[] = "Thequickbrownfoxjumpsoverthelazydog\0";
uint8_t buffer2_rx[BUF2_SIZE] = {};
#endif
/*
* We need 5x(buffer size) + 1 to print a comma-separated list of each
@ -660,6 +675,13 @@ end:
/*test case main entry*/
void test_main(void)
{
#if CONFIG_NOCACHE_MEMORY
memset(buffer_tx, 0, sizeof(buffer_tx));
memcpy(buffer_tx, tx_data, sizeof(tx_data));
memset(buffer2_tx, 0, sizeof(buffer2_tx));
memcpy(buffer2_tx, tx2_data, sizeof(tx2_data));
#endif
ztest_test_suite(test_spi, ztest_unit_test(test_spi_loopback));
ztest_run_test_suite(test_spi);
}