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drivers: flash: stm32 ospi driver correct device size

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The find_lsb_set is giving the position of the first '1' found,
starting from 1. "Bits are numbered starting at 1
from the least significant bit."
So that the find_lsb_set(64MBytes) is 27.
To get 64MBytes = 2^26, the value of the Init.DeviceSize must be 26.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2023-01-06 13:03:42 +01:00 • committed by Carles Cufí
commit 4500dba078
1 changed files with 2 additions and 1 deletions
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3
drivers/flash/flash_stm32_ospi.c
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@ -1934,7 +1934,8 @@ static int flash_stm32_ospi_init(const struct device *dev)
/* Initialize OSPI HAL structure completely */
dev_data->hospi.Init.FifoThreshold = 4;
dev_data->hospi.Init.ClockPrescaler = prescaler;
dev_data->hospi.Init.DeviceSize = find_lsb_set(dev_cfg->flash_size);
/* Give a bit position from 0 to 31 to the HAL init for the DCR1 reg */
dev_data->hospi.Init.DeviceSize = find_lsb_set(dev_cfg->flash_size) - 1;
dev_data->hospi.Init.DualQuad = HAL_OSPI_DUALQUAD_DISABLE;
dev_data->hospi.Init.ChipSelectHighTime = 2;
dev_data->hospi.Init.FreeRunningClock = HAL_OSPI_FREERUNCLK_DISABLE;