From 82e89247272c3c5443d47df48372c71211cc08fb Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Tue, 9 Feb 2016 18:16:32 +0100
Subject: Port to l0 board

---
 SConstruct |  2 +-
 main.cpp   | 72 ++++++++++++++++++++++++++++++++++++++++++--------------------
 2 files changed, 50 insertions(+), 24 deletions(-)

diff --git a/SConstruct b/SConstruct
index 3d2c473..6926505 100644
--- a/SConstruct
+++ b/SConstruct
@@ -6,6 +6,6 @@ env = Environment(
 
 SConscript('laks/build_rules')
 
-env.SelectMCU('stm32f103cb')
+env.SelectMCU('stm32l052c8')
 
 env.Firmware('demo.elf', Glob('*.cpp'))
diff --git a/main.cpp b/main.cpp
index a2a48a7..a3c6eea 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,4 +1,6 @@
+#include <rcc/flash.h>
 #include <rcc/rcc.h>
+#include <syscfg/syscfg.h>
 #include <gpio/gpio.h>
 #include <os/time.h>
 #include <spi/spi.h>
@@ -17,19 +19,15 @@ auto conf_desc = configuration_desc(1, 1, 0, 0xc0, 0,
 desc_t dev_desc_p = {sizeof(dev_desc), (void*)&dev_desc};
 desc_t conf_desc_p = {sizeof(conf_desc), (void*)&conf_desc};
 
-Pin usb_dm   = GPIOA[11];
-Pin usb_dp   = GPIOA[12];
-Pin usb_disc = GPIOB[0];
+USB_l0 usb(USB, dev_desc_p, conf_desc_p);
 
-USB_f1 usb(USB, dev_desc_p, conf_desc_p);
 
-Pin nfc_irq_in  = GPIOA[2];
-Pin nfc_irq_out = GPIOA[3];
-
-Pin nfc_ss      = GPIOA[4];
-Pin nfc_sck     = GPIOA[5];
-Pin nfc_miso    = GPIOA[6];
-Pin nfc_mosi    = GPIOA[7];
+Pin nfc_sck     = GPIOB[3];
+Pin nfc_miso    = GPIOB[4];
+Pin nfc_mosi    = GPIOB[5];
+Pin nfc_ss      = GPIOB[6];
+Pin nfc_irq_out = GPIOB[7];
+Pin nfc_irq_in  = GPIOC[13];
 
 class CR95HF {
 	private:
@@ -265,9 +263,11 @@ class USB_MSC_BBB : public USB_class_driver {
 		bool pending_write;
 		uint32_t pending_write_addr;
 		uint32_t pending_write_num;
-		uint32_t pending_write_recv;
 		
 		CBW cbw;
+		
+		uint32_t pending_write_recv;
+		
 		CSW csw;
 	
 	public:
@@ -444,26 +444,52 @@ class USB_MSC_BBB : public USB_class_driver {
 USB_MSC_BBB usb_msc_bbb(usb);
 
 int main() {
+	// Configure flash latency.
+	FLASH.ACR = 1 << 0;
+	
+	// Enable HSI16.
+	RCC.CR |= 1 << 0; // HSI16ON
+	while(!(RCC.CR & (1 << 2))); // HSI16RDYF
+	
+	// Configure PLL.
+	RCC.CFGR |= (1 << 22) | (1 << 18) | (0 << 16); // PLLDIV = /2, PLLMUL = 4x, PLLSRC = HSI16
+	
+	// Enable PLL.
+	RCC.CR |= 1 << 24; // PLLON
+	while(!(RCC.CR & (1 << 25))); // PLLRDY
+	
+	// Switch to PLL.
+	RCC.CFGR |= 3 << 0; // SW = PLL
+	while((RCC.CFGR & (3 << 2)) != (3 << 2)); // SWS = PLL
+	
 	// Initialize system timer.
-	STK.LOAD = 72000000 / 8 / 1000; // 1000 Hz.
+	STK.LOAD = 32000000 / 8 / 1000; // 1000 Hz.
+	STK.VAL = 0;
 	STK.CTRL = 0x03;
 	
-	RCC.enable(RCC.GPIOA);
-	RCC.enable(RCC.GPIOB);
+	// Enable VREFINT for HSI48.
+	RCC.enable(RCC.SYSCFG);
+	SYSCFG.CFGR3 |= (1 << 13) | (1 << 0); // ENREF_HSI48, EN_VREFINT
+	while(!(SYSCFG.CFGR3 & (1 << 26))); // REF_HSI48_RDYF
 	
-	usb_disc.on();
-	usb_disc.set_type(Pin::OpenDrain);
-	usb_disc.set_mode(Pin::Output);
+	// Enable HSI48.
+	RCC.CRRCR |= 1 << 0; // HSI48ON
+	while(!(RCC.CRRCR & (1 << 1))); // HSI48RDY
 	
-	usb_dm.set_mode(Pin::AF);
-	usb_dp.set_mode(Pin::AF);
+	// Select HSI48 for USB.
+	RCC.CCIPR |= 1 << 26;
+	
+	RCC.enable(RCC.GPIOA);
+	RCC.enable(RCC.GPIOB);
+	RCC.enable(RCC.GPIOC);
 	
 	RCC.enable(RCC.USB);
 	
 	usb.init();
 	
 	Time::sleep(10);
-	usb_disc.off();
+	USB.reg.BCDR |= 1 << 15;
+	//usb_disc.off();
 	
 	RCC.enable(RCC.SPI1);
 	
@@ -506,7 +532,7 @@ int main() {
 			cmd_sent = false;
 			
 			if(buf[0] == 128 && buf[14] == 0) {
-				usb_disc.on();
+				//usb_disc.on();
 				uint8_t* id_raw = &buf[11];
 				uint8_t* id_ascii = sectors[4];
 				for(uint32_t i = 0; i < 8; i++) {
@@ -514,7 +540,7 @@ int main() {
 					*id_ascii++ = "0123456789ABCDEF"[*id_raw-- & 0xf];
 				}
 				Time::sleep(10);
-				usb_disc.off();
+				//usb_disc.off();
 				
 				nfc_delay_until = Time::time() + 5000; // Valid for five seconds.
 			} else {
-- 
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