43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
use hcl::platform::PeripheralRef;
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use hcl::platform::Location;
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use hcl::platform::spi;
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use hcl::platform::gpio;
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pub fn read<SPIAddr, GPIOAddr>(spi: &mut PeripheralRef<spi::SPI, SPIAddr>,
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nss_gpio: &mut PeripheralRef<gpio::GPIO, GPIOAddr>,
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nss_idx: u32)
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-> Result<f32, &'static str>
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where SPIAddr: Location,
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GPIOAddr: Location
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{
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spi.configure(|s| {
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s.set_enabled(true)
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.set_master_mode(true)
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.set_software_slave_select(true)
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.set_clock_divider(128)
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.set_data_16bit(true)
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.set_clock_skip_first(true)
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// required for master mode, even if ss is done manually
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.set_slave_select_output_enabled(true)
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});
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nss_gpio.reset_bit(nss_idx);
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spi.set_data(0x0000);
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while !spi.rx_buffer_not_empty() {}
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let raw_result = spi.data();
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while spi.busy() {}
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nss_gpio.set_bit(nss_idx);
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spi.set_enabled(false);
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if raw_result & (1 << 2) != 0 {
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Err("MAX6675: Termocouple measures open")
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} else {
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let result = ((raw_result >> 3) as f32) * 0.25;
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Ok(result)
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}
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}
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