AP_HAL_ChibiOS: fix spi clock calculation

7 years ago · 79f3fd532b
1 changed files with 1 additions and 1 deletions
--- a/libraries/AP_HAL_ChibiOS/SPIDevice.cpp
+++ b/libraries/AP_HAL_ChibiOS/SPIDevice.cpp
@ -156,7 +156,7 @@ uint16_t SPIDevice::derive_freq_flag(uint32_t _frequency)
				@@ -156,7 +156,7 @@ uint16_t SPIDevice::derive_freq_flag(uint32_t _frequency)
    uint32_t spi_clock_freq = SPI1_CLOCK;
    uint8_t busid = spi_devices[device_desc.bus].busid;
    if (busid > 0 && busid-1 < ARRAY_SIZE_SIMPLE(bus_clocks)) {
-        spi_clock_freq = bus_clocks[busid-1];
+        spi_clock_freq = bus_clocks[busid-1] / 2;
    }

    // find first divisor that brings us below the desired SPI clock