From: Tilman Sauerbeck Date: Sat, 4 Jan 2020 18:19:02 +0000 (+0100) Subject: common: Add the mx25l module. X-Git-Url: http://git.code-monkey.de/?a=commitdiff_plain;h=2be180cd54e988fa5abf0eabb7ee7138f31469f0;p=gps-watch.git common: Add the mx25l module. Provides access to the status register and device ID only for now. --- diff --git a/SConscript.libcommon b/SConscript.libcommon index 0ca199e..061400f 100644 --- a/SConscript.libcommon +++ b/SConscript.libcommon @@ -22,6 +22,7 @@ source_files_rs = [ 'src/common/gps.rs', 'src/common/fmt.rs', 'src/common/time.rs', + 'src/common/mx25l.rs', ] source_files_c = [ diff --git a/src/common/lib.rs b/src/common/lib.rs index c74704c..e06cc33 100644 --- a/src/common/lib.rs +++ b/src/common/lib.rs @@ -44,3 +44,4 @@ pub mod display; pub mod gps; pub mod fmt; pub mod time; +pub mod mx25l; diff --git a/src/common/mx25l.rs b/src/common/mx25l.rs new file mode 100644 index 0000000..6e74f4a --- /dev/null +++ b/src/common/mx25l.rs @@ -0,0 +1,76 @@ +/* + * Copyright (c) 2020 Tilman Sauerbeck (tilman at code-monkey de) + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +use gpio; +use spi; + +pub struct Mx25l { + cs_gpio: u32, + cs_gpio_pin: u32, +} + +enum Command { + RDSR = 0x05, + RDID = 0x9f, +} + +impl Mx25l { + pub fn new(cs_gpio: u32, cs_gpio_pin: u32) -> Mx25l { + Mx25l { + cs_gpio: cs_gpio, + cs_gpio_pin: cs_gpio_pin, + } + } + + pub fn read_status(&self) -> u8 { + self.with_selected(|| { + spi::tx8(spi::SPI0, Command::RDSR as u8); + + spi::tx8(spi::SPI0, 0xff) + }) + } + + pub fn read_id(&self) -> (u8, u16) { + self.with_selected(|| { + spi::tx8(spi::SPI0, Command::RDID as u8); + + let manufacturer_id = spi::tx8(spi::SPI0, 0xff); + let device_id0 = spi::tx8(spi::SPI0, 0xff) as u16; + let device_id1 = spi::tx8(spi::SPI0, 0xff) as u16; + + (manufacturer_id, device_id0 | (device_id1 << 8)) + }) + } + + fn with_selected(&self, func: F) -> T + where F: FnOnce() -> T + { + gpio::clear(self.cs_gpio, self.cs_gpio_pin); + + let r = func(); + + gpio::set(self.cs_gpio, self.cs_gpio_pin); + + r + } +}