dev: Added config bits and copy of periph init code

main.cpp

@@ -6,9 +6,111 @@
 //  file, You can obtain one at http://mozilla.org/MPL/2.0/.
 //  This Source Code Form is "Incompatible With Secondary Licenses", as
 //  defined by the Mozilla Public License, v. 2.0.
+// PIC32MX270F256B Configuration Bit Settings
 
+// 'C' source line config statements
+
+// DEVCFG3
+#pragma config USERID = 0xBEEF          // Enter Hexadecimal value (Enter Hexadecimal value)
+#pragma config PMDL1WAY = OFF           // Peripheral Module Disable Configuration (Allow multiple reconfigurations)
+#pragma config IOL1WAY = OFF            // Peripheral Pin Select Configuration (Allow multiple reconfigurations)
+#pragma config FUSBIDIO = ON            // USB USID Selection (Controlled by the USB Module)
+#pragma config FVBUSONIO = ON           // USB VBUS ON Selection (Controlled by USB Module)
+
+// DEVCFG2
+#pragma config FPLLIDIV = DIV_2         // PLL Input Divider (2x Divider)
+#pragma config FPLLMUL = MUL_24         // PLL Multiplier (24x Multiplier)
+#pragma config UPLLIDIV = DIV_2         // USB PLL Input Divider (2x Divider)
+#pragma config UPLLEN = ON              // USB PLL Enable (Enabled)
+#pragma config FPLLODIV = DIV_8         // System PLL Output Clock Divider (PLL Divide by 8)
+
+// DEVCFG1
+#pragma config FNOSC = FRCPLL           // Oscillator Selection Bits (Fast RC Osc with PLL)
+#pragma config FSOSCEN = ON             // Secondary Oscillator Enable (Enabled)
+#pragma config IESO = ON                // Internal/External Switch Over (Enabled)
+#pragma config POSCMOD = OFF            // Primary Oscillator Configuration (Primary osc disabled)
+#pragma config OSCIOFNC = OFF           // CLKO Output Signal Active on the OSCO Pin (Disabled)
+#pragma config FPBDIV = DIV_2           // Peripheral Clock Divisor (Pb_Clk is Sys_Clk/2)
+#pragma config FCKSM = CSDCMD           // Clock Switching and Monitor Selection (Clock Switch Disable, FSCM Disabled)
+#pragma config WDTPS = PS1048576        // Watchdog Timer Postscaler (1:1048576)
+#pragma config WINDIS = OFF             // Watchdog Timer Window Enable (Watchdog Timer is in Non-Window Mode)
+#pragma config FWDTEN = OFF             // Watchdog Timer Enable (WDT Disabled (SWDTEN Bit Controls))
+#pragma config FWDTWINSZ = WINSZ_25     // Watchdog Timer Window Size (Window Size is 25%)
+
+// DEVCFG0
+#pragma config JTAGEN = ON              // JTAG Enable (JTAG Port Enabled)
+#pragma config ICESEL = ICS_PGx2        // ICE/ICD Comm Channel Select (Communicate on PGEC2/PGED2)
+#pragma config PWP = OFF                // Program Flash Write Protect (Disable)
+#pragma config BWP = OFF                // Boot Flash Write Protect bit (Protection Disabled)
+#pragma config CP = OFF                 // Code Protect (Protection Disabled)
+
+// #pragma config statements should precede project file includes.
+// Use project enums instead of #define for ON and OFF.
 #include <xc.h>
 
+void sendChar(uint8_t c) {
+    U1TXREG = c;
+    while(!U1STAbits.TRMT); // wait for transmission
+    return;
+}
+
+uint8_t appInfo(uint8_t *msg, uint16_t len) {
+    uint16_t offset = 0;
+    do {
+        sendChar(*(msg+offset));
+        offset++;
+    } while(--len);
+    return 0;
+}
+
+uint8_t initSystem(void) {
+    /* set up GPIO */
+    SYSKEY = 0x0;
+    SYSKEY = 0xAA996655;
+    SYSKEY = 0x556699AA;
+    CFGCON &= ~(1<<13); // unlock PPS
+    
+    SDI1R = 0b0110; // RC8
+    SDI2R = 0b0100; // RB2
+    SS2R = 0b0111; // RC4
+    RPB5R = 0b0011; // SD01
+    RPC0R = 0b0001; // U1TX
+    
+    SYSKEY = 0x12345678; // lock SYSKEY
+
+    /* Set up SPI1 */
+    SPI1BRG = 1; // 1.5MHz
+    SPI1CONbits.ENHBUF = 1; // enable enhanced buffer
+    SPI1CONbits.MSTEN = 1; // master mode
+    SPI1CONbits.STXISEL = 0b10; // interrupt on half-empty or more
+    
+    /* set up UART */
+    U1BRG = 38; // 9600 baud
+    U1STAbits.UTXEN = 1; // enable transmitter
+    U1MODEbits.ON = 1; // enable UART
+    
+    /* set up DMA */
+    // clear all 4 DMA channel flags & IE
+//    IEC1CLR = 0xF0000000;
+//    IFS1CLR = 0xF0000000;
+//    
+//    DMACONbits.ON = 1; //enable DMA controller
+//    
+//    // Channel 0: SPI2 receive triggers DMA to buffer
+//    DCH0ECONbits.CHSIRQ = 51; // SPI2 receive complete
+//    DCH0ECONbits.SIRQEN = 1; // enable trigger
+//    DCH0CONbits.CHCHN = 1; // enable chaining
+//    DCH0CONbits.CHAEN = 1; // auto enable
+//    DCH0SSA = KVA_TO_PA(&SPI2BUF); // source is SPI2BUF
+//    DCH0DSA = KVA_TO_PA(dmaBuffer);
+//    DCH0SSIZ = 1;
+//    DCH0DSIZ = 16;
+//    DCH0CSIZ = 16; // copy 1 sets of 2 bytes from source to destination
+//    
+//    IEC1SET = 0x10000000; // channel 0 interrupt enable
+//    DCH0CONbits.CHEN = 1; // enable channel
+    return 0;
+}
 extern "C" int main(void) {
 
     while(1) {