Diff: SPI.cpp

Revision:

1:acc66d3a1a1c

Child:

2:b615682e3e4f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPI.cpp	Sun Apr 01 15:43:02 2018 +0000
@@ -0,0 +1,117 @@
+#include "SPI.h"
+
+SPI spi(PA_7, PA_6, PA_5);      // Ordered as: mosi, miso, sclk could use forth parameter ssel
+                                // However using multi SPI devices within FPGA with a seperate chip select
+SPI spi_cmd(PA_7, PA_6, PA_5);  // NB another instance call spi_cmd for 8 bit SPI dataframe see later line 37
+                                // For each device NB PA_7 PA_6 PA_5 are D11 D12 D13 respectively
+DigitalOut cs(PC_6);            // Chip Select for Basic Outputs to illuminate Onboard FPGA DEO nano LEDs CN7 pin 1
+DigitalOut LCD_cs(PB_15);       // Chip Select for the LCD via FPGA CN7 pin 3
+DigitalOut ADC_cs(PB_9);        // Chip Select for the ADC via FPGA CN7 pin 4
+
+//NBB the following line for F429ZI !!!!
+DigitalIn DO_NOT_USE(PB_12);    // MAKE PB_12 (D19) an INPUT do NOT make an OUTPUT under any circumstances !!!!! ************* !!!!!!!!!!!
+                                // This Pin is connected to the 5VDC from the FPGA card and an INPUT is 5V Tolerant
+
+//Ticker ticktock;
+
+
+int lcd_cls(void){
+    LCD_cs = 0;spi_cmd.write(0);spi.write(0x0001);LCD_cs = 1;wait_us(CD);    //Clear Screen
+    return 0;
+}
+
+int lcd_locate(uint8_t line, uint8_t column){
+    uint8_t line_addr;
+    uint8_t column_addr;
+    switch(line){
+        case 1: line_addr=0x80; break;
+        case 2: line_addr=0xC0; break;
+        default: return -1; //return code !=0 is error
+        }
+    if(column<16){column_addr=column;}
+    else{return -1;}
+    LCD_cs = 0;
+    spi_cmd.write(0);
+    spi.write(line_addr+column_addr);
+    LCD_cs = 1;
+    wait_us(CD); //DDRAM location Second line is 0x00C0 first line starts at 0x0080
+    return 0;
+}
+
+int lcd_display(char* str){
+    
+    if (strlen(str)>16){return -1;} //return code !=0 is error
+    
+    uint8_t command_data=1;
+    uint32_t wait_time;
+ 
+    switch(command_data){
+        case 0: wait_time=DD; break;
+        case 1: wait_time=CD; break;
+        default: return -1;
+        }
+
+    for (int i=0; i<strlen(str);i++){
+        LCD_cs = 0;
+        spi_cmd.write(0);
+        spi.write((command_data<<8)+str[i]);
+        LCD_cs = 1;
+        wait_us(wait_time);
+    }
+    return 0;
+}
+
+int bar_graph(uint8_t level){
+    if (level>16){return -1;} //return code !=0 is error
+    LCD_cs = 0;spi_cmd.write(0);spi.write(0x00C0);LCD_cs = 1;wait_us(CD); //DDRAM location Second line is 0x00C0 first line starts at 0x0080
+    for (int i=1; i<=level ;i++)
+    {
+        if(level>0){LCD_cs = 0;spi_cmd.write(0);spi.write(0x01FF);LCD_cs = 1;wait_us(DD);}   // BLACK SPACE
+        else{LCD_cs = 0;spi_cmd.write(0);spi.write(0x0120);LCD_cs = 1;wait_us(DD);}          // WHITE SPACE
+    }
+    for (int i=level; i<=16 ;i++)
+    {
+        LCD_cs = 0;spi_cmd.write(0);spi.write(0x0120);LCD_cs = 1;wait_us(DD); // SPACE
+    }
+    return 0; // return code ==0 is OK
+}
+
+int read_adc(void){
+    int adval_d;
+    float adval_f;
+    ADC_cs = 0;
+    adval_d = spi.write(0x00);
+    ADC_cs =1 ;
+    adval_f = 3.3f*((float)adval_d/4095);
+    printf("%d %.3fV\r\n",adval_d,adval_f);
+    return adval_d;    
+}
+
+void pulse_bar_graph(void){
+    for (uint8_t i=0;i<16;i++)
+    {
+        printf("%u\r\n",i);
+        bar_graph(i);
+        wait_ms(100);
+    }
+    for (int8_t i=15;i>=0;i--)
+    {
+        printf("%u\r\n",i);
+        bar_graph(i);
+        wait_ms(100);
+    }
+}
+
+int read_switches(void){
+    int sw_val;
+    cs = 0;
+    spi_cmd.write(0);
+    sw_val = spi.write(0x00)&0x0F; // Just want lower 4bit nibble
+    cs = 1 ;
+    if (sw_val&(1<<0)){printf("Switch 0 :");}
+    if (sw_val&(1<<1)){printf("Switch 1 :");}
+    if (sw_val&(1<<2)){printf("Switch 2 :");}
+    if (sw_val&(1<<3)){printf("Switch 3 :");}
+    if (sw_val>0){printf("\r\n");}
+    return sw_val;    
+}