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drivers: flash: stm32 qspi 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.
The HAL_QSPI_Init() accepts Init.FlashSize where "FlashSize+1
is effectively the number of address bits
required to address the flash memory."
To get 64MBytes = 2^26, the value of the Init.FlashSize must be 25.
and bit written to the DCR = 25.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2023-01-06 13:40:29 +01:00 • committed by Carles Cufí
commit 302983fd7d
1 changed files with 2 additions and 1 deletions
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3
drivers/flash/flash_stm32_qspi.c
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@ -1189,7 +1189,8 @@ static int flash_stm32_qspi_init(const struct device *dev)
__ASSERT_NO_MSG(prescaler <= STM32_QSPI_CLOCK_PRESCALER_MAX);
/* Initialize QSPI HAL */
dev_data->hqspi.Init.ClockPrescaler = prescaler;
dev_data->hqspi.Init.FlashSize = find_lsb_set(dev_cfg->flash_size);
/* Give a bit position from 0 to 31 to the HAL init minus 1 for the DCR1 reg */
dev_data->hqspi.Init.FlashSize = find_lsb_set(dev_cfg->flash_size) - 2;
HAL_QSPI_Init(&dev_data->hqspi);