From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Wed, 6 Nov 2019 19:42:54 +0000 (+0100)
Subject: common: Implement port::init().
X-Git-Url: http://git.code-monkey.de/?p=gps-watch.git;a=commitdiff_plain;h=68f5e8f554dfb18cd0dc983b2253dd01145458a7

common: Implement port::init().

This function powers up ports A, B, C, D and E.
---

diff --git a/src/common/port.rs b/src/common/port.rs
index 0dc95a8..32f8c26 100644
--- a/src/common/port.rs
+++ b/src/common/port.rs
@@ -33,12 +33,20 @@ pub const PORTC: u32 = PORT_BASE + 0x2000;
 pub const PORTD: u32 = PORT_BASE + 0x3000;
 pub const PORTE: u32 = PORT_BASE + 0x4000;
 
+const SIM_SCGC5: u32 = 0x40048038;
+
 const PORT_PCR_MUX_SHIFT: u32 = 8;
 const PORT_PCR_MUX_MASK: u32 = 3 << PORT_PCR_MUX_SHIFT;
 
 const PORT_PCR_PE: u32 = 1 << 1;
 const PORT_PCR_PS: u32 = 1 << 0;
 
+const SIM_SCGC5_PORTA: u32 = 1 << 9;
+const SIM_SCGC5_PORTB: u32 = 1 << 10;
+const SIM_SCGC5_PORTC: u32 = 1 << 11;
+const SIM_SCGC5_PORTD: u32 = 1 << 12;
+const SIM_SCGC5_PORTE: u32 = 1 << 13;
+
 pub enum Pull {
     None,
     Up,
@@ -49,6 +57,19 @@ fn pcr_offset(pin: u32) -> u32 {
     pin * 4
 }
 
+pub fn init() {
+    let mut scgc5 = Reg32::new(SIM_SCGC5);
+
+    scgc5.modify(|v| {
+          v
+        | SIM_SCGC5_PORTA
+        | SIM_SCGC5_PORTB
+        | SIM_SCGC5_PORTC
+        | SIM_SCGC5_PORTD
+        | SIM_SCGC5_PORTE
+    });
+}
+
 pub fn set_af(port: u32, pin: u32, af: u32) {
     let mut pcr = Reg32::new(port + pcr_offset(pin));