Some son of a bitch put a capacitor on PA9, so USART1 doesn't TX through it.

[goodfet] / firmware / lib / stm32f407.c

diff --git a/firmware/lib/stm32f407.c b/firmware/lib/stm32f407.c
index 167d05a..b781e49 100644 (file)
--- a/firmware/lib/stm32f407.c
+++ b/firmware/lib/stm32f407.c
@@ -9,9 +9,8 @@
 //#include "stm322xg_eval.h"
 #include <stm32f4xx_gpio.h>
 #include <stm32f4xx_rcc.h>
-#include <stm32f4xx_rcc.h>
-//#include "stm32f4_discovery.h"
-
+#include <stm32f4xx_usart.h>
+#include "stm32f4_discovery.h"
 
 void ioinit(){
   GPIO_InitTypeDef  GPIO_InitStructure;
@@ -23,41 +22,134 @@ void ioinit(){
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
+  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
   GPIO_Init(GPIOD, &GPIO_InitStructure);
 }
 
-
+void stmdelay(){
+  //IO so it doesn't get swapped out.
+  __IO uint32_t count=   0x1000;   // >1kbit/s
+  //__IO uint32_t count= 0x100000; // 5 bits per second, for testing
+  while(count--);
+}
 void ledon(){
-  //GPIOG->BSRRL=GPIO_Pin_14;
-  GPIO_ResetBits(GPIOD, GPIO_Pin_14);
+  GPIO_SetBits(GPIOD, GPIO_Pin_14);
 }
 void ledoff(){
-  //GPIOG->BSRRH=GPIO_Pin_14;
-  GPIO_SetBits(GPIOD, GPIO_Pin_14);
+  GPIO_ResetBits(GPIOD, GPIO_Pin_14);
+}
+void clkon(){
+  GPIO_SetBits(GPIOD, GPIO_Pin_12);
+}
+void clkoff(){
+  GPIO_ResetBits(GPIOD, GPIO_Pin_12);
 }
 
+void spibit(int one){
+  if(one) ledon();
+  else    ledoff();
+  clkon();
+  stmdelay();
+  clkoff();
+  stmdelay();
+}
+
+void spiword(uint32_t word){
+  int i=32;
+  while(i--){
+    //morsebit(word&1);
+    //manchesterbit(word&1);
+    spibit(word&1);
+    word=(word>>1);
+  }
+}
+void spibyte(uint8_t word){
+  int i=8;
+  while(i--){
+    //morsebit(word&1);
+    //manchesterbit(word&1);
+    spibit(word&1);
+    word=(word>>1);
+  }
+}
+
+
 
 //! Count the length of a string.
 uint32_t strlen(const char *s){
-  return 0;
+  int i=0;
+  while(s[i++]);
+  return i-1;
+}
+
+
+//! Initialize the USART
+void usartinit(){
+  GPIO_InitTypeDef GPIO_InitStructure;
+  USART_InitTypeDef USART_InitStructure;
+  
+  /* --------------------------- System Clocks Configuration -----------------*/
+  /* USART1 clock enable */
+  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
+ 
+  /* GPIOB clock enable */
+  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
+  
+  
+  
+  /*-------------------------- GPIO Configuration ----------------------------*/
+  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
+  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
+  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
+  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
+  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_Init(GPIOB, &GPIO_InitStructure);
+ 
+  /* Connect USART pins to AF */
+  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1); // USART1_TX
+  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1); // USART1_RX
+  
+  /* USARTx configuration ------------------------------------------------------*/
+  /* USARTx configured as follow:
+        - BaudRate = 9600 baud
+        - Word Length = 8 Bits
+        - One Stop Bit
+        - No parity
+        - Hardware flow control disabled (RTS and CTS signals)
+        - Receive and transmit enabled
+  */
+  USART_InitStructure.USART_BaudRate = 9600;
+  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+  USART_InitStructure.USART_StopBits = USART_StopBits_1;
+  USART_InitStructure.USART_Parity = USART_Parity_No;
+  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+ 
+  //USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+  USART_InitStructure.USART_Mode = USART_Mode_Tx;
+ 
+  USART_Init(USART1, &USART_InitStructure);
+ 
+  USART_Cmd(USART1, ENABLE);
 }
 
+
 //! Initialize the STM32F4xx ports and USB.
 void stm32f4xx_init(){
+  int i=20;
+  
   SystemInit();
   ioinit();
-  while(1){
-    ledon();
-    delay(0x1000);
-    ledoff();
-    delay(0x1000);
-  }
+  usartinit();
+  
+  
+  return;
 }
 
 //! Receive a byte.
 unsigned char serial0_rx(){
+  while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET); // Wait for Character
+  return USART_ReceiveData(USART1);
 }
 
 //! Receive a byte.
@@ -66,9 +158,13 @@ unsigned char serial1_rx(){
 
 //! Transmit a byte.
 void serial0_tx(unsigned char x){
-}
-//! Transmit a byte.
-void serial_tx_old(unsigned char x){
+  
+  spiword(0xdead);
+  
+  while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
+  USART_SendData(USART1, (uint16_t) x);
+  
+  spiword(0xbeef);
 }
 
 //! Transmit a byte on the second UART.
@@ -95,8 +191,6 @@ int main(void);
 //From min.s
 void Reset_Handler(void);
 
-
-
 // Define the vector table
 unsigned int * myvectors[50] 
    __attribute__ ((section("vectors")))= {