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[nrf fromtree] tests: drivers: spi: spi_loopback: configure spi laten… #2966

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Merged
merged 1 commit into from
Jun 18, 2025
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[nrf fromtree] tests: drivers: spi: spi_loopback: configure spi laten… #2966

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4 changes: 4 additions & 0 deletions tests/drivers/spi/spi_loopback/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,10 @@ config SPI_LARGE_BUFFER_SIZE
int "Large buffer size"
default 8192

config SPI_IDEAL_TRANSFER_DURATION_SCALING
int "Scaling factor to compare ideal and measured SPI transfer duration"
default 8

if SOC_SERIES_STM32H7X

config SPI_LOOPBACK_16BITS_FRAMES
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1 change: 1 addition & 0 deletions tests/drivers/spi/spi_loopback/boards/nrf54h20dk_nrf54h20_cpuapp.conf
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@@ -0,0 +1 @@
CONFIG_SPI_IDEAL_TRANSFER_DURATION_SCALING=12
1 change: 1 addition & 0 deletions tests/drivers/spi/spi_loopback/boards/nrf54h20dk_nrf54h20_cpurad.conf
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@@ -0,0 +1 @@
CONFIG_SPI_IDEAL_TRANSFER_DURATION_SCALING=12
6 changes: 4 additions & 2 deletions tests/drivers/spi/spi_loopback/src/spi.c
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Expand Up @@ -327,7 +327,7 @@ ZTEST(spi_loopback, test_spi_complete_multiple_timed)

/* Fail if transfer is faster than theoretically possible */
zassert_true(time_spent_us >= minimum_transfer_time_us,
"Transfer faster than theoretically possible");
"Transfer faster than theoretically possible");

/* handle overflow for print statement */
latency_measurement = time_spent_us - expected_transfer_time_us;
Expand All @@ -337,7 +337,9 @@ ZTEST(spi_loopback, test_spi_complete_multiple_timed)
TC_PRINT("Latency measurement: %llu us\n", latency_measurement);

/* Allow some overhead, but not too much */
zassert_true(time_spent_us <= expected_transfer_time_us * 8, "Very high latency");
zassert_true(time_spent_us <=
expected_transfer_time_us * CONFIG_SPI_IDEAL_TRANSFER_DURATION_SCALING,
"Very high latency");

spi_loopback_compare_bufs(buffer_tx, buffer_rx, BUF_SIZE,
buffer_print_tx, buffer_print_rx);
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