tests: drivers: dma: chen_blen_transfer: add bdma test to nucleo_h743zi

Add unit tests for BDMA driver.

Also requires adding additional kconfig options to allocate
the memory buffers in a specific SRAM section, because
the BDMA only has access to SRAM4.

Signed-off-by: Hein Wessels <heinwessels93@gmail.com>

tests/drivers/dma/chan_blen_transfer/Kconfig

@@ -13,6 +13,11 @@ config DMA_TRANSFER_CHANNEL_NR_1
 	int "second DMA channel to use"
 	default 1
 
+config DMA_LOOP_TRANSFER_SRAM_SECTION
+	string "the section to place the memory buffers."
+	depends on NOCACHE_MEMORY
+	default ".nocache"
+
 config DMA_LOOP_TRANSFER_NUMBER_OF_DMAS
 	int "Number of DMAs to test"
 	default 1

tests/drivers/dma/chan_blen_transfer/boards/nucleo_h743zi.conf

@@ -1,3 +1,11 @@
-CONFIG_DMA_TRANSFER_CHANNEL_NR_0=6
-CONFIG_DMA_TRANSFER_CHANNEL_NR_1=10
+CONFIG_DMA_TRANSFER_CHANNEL_NR_0=4
+CONFIG_DMA_TRANSFER_CHANNEL_NR_1=6
+CONFIG_DMA_LOOP_TRANSFER_NUMBER_OF_DMAS=2
+
+# Required by BDMA which only has access to
+# a NOCACHE SRAM4 section. All other DMAs also
+# has access to this section.
+CONFIG_DMA_LOOP_TRANSFER_SRAM_SECTION=".sram4"
+
+# Required for SRAM4 to be non-cachable
 CONFIG_NOCACHE_MEMORY=y

tests/drivers/dma/chan_blen_transfer/boards/nucleo_h743zi.overlay

@@ -13,3 +13,18 @@
 test_dma0: &dmamux1 {
 	status = "okay";
 };
+
+/* The BDMA driver expects the SRAM4 region
+ * to be non-cachable.
+ */
+&sram4 {
+	zephyr,memory-region-mpu = "RAM_NOCACHE";
+};
+
+&bdma1 {
+	status = "okay";
+};
+
+test_dma1: &dmamux2 {
+	status = "okay";
+};

tests/drivers/dma/chan_blen_transfer/src/test_dma.c

@@ -24,10 +24,10 @@
 
 #ifdef CONFIG_NOCACHE_MEMORY
 static __aligned(32) char tx_data[RX_BUFF_SIZE] __used
-	__attribute__((__section__(".nocache")));
+	__attribute__((__section__(CONFIG_DMA_LOOP_TRANSFER_SRAM_SECTION)));
 static const char TX_DATA[] = "It is harder to be kind than to be wise........";
 static __aligned(32) char rx_data[RX_BUFF_SIZE] __used
-	__attribute__((__section__(".nocache.dma")));
+	__attribute__((__section__(CONFIG_DMA_LOOP_TRANSFER_SRAM_SECTION".dma")));
 #else
 static const char tx_data[] = "It is harder to be kind than to be wise........";
 static char rx_data[RX_BUFF_SIZE] = { 0 };
@@ -90,6 +90,7 @@ static int test_task(const struct device *dma, uint32_t chan_id, uint32_t blen)
 		return TC_FAIL;
 	}
 	k_sleep(K_MSEC(2000));
+
 	TC_PRINT("%s\n", rx_data);
 	if (strcmp(tx_data, rx_data) != 0) {
 		return TC_FAIL;