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samd/samd_qspiflash: Correct QSPI baud calculation.

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The QSPI baud is derived from the AHB clock, not from the APB (peripheral)
clock.

Datasheet: The QSPI Baud rate clock is generated by dividing the module
clock (CLK_QSPI_AHB) by a value between 1 and 255.

As previously implemented, all baudrates are 2.5 times greater than
expected.

Signed-off-by: I. Tomita <ziceva@me.com>
This commit is contained in:
I. Tomita
2023-10-19 12:54:37 +03:00
committed by Damien George
parent 70b95d8f93
commit c69f0e4eee
1 changed files with 1 additions and 1 deletions
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2
ports/samd/samd_qspiflash.c
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@@ -238,7 +238,7 @@ static void wait_for_flash_ready(void) {
} }
static uint8_t get_baud(int32_t freq_mhz) { static uint8_t get_baud(int32_t freq_mhz) {
int baud = get_peripheral_freq() / (freq_mhz * 1000000) - 1; int baud = get_cpu_freq() / (freq_mhz * 1000000) - 1;
if (baud < 1) { if (baud < 1) {
baud = 1; baud = 1;
} }