Leo Boogaard / Mbed 2 deprecated L432KC-SMT16030_fork

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Dependencies:   mbed

Fork of L432KC-SMT16030 by Leo Boogaard

SerialIRQ.cpp@0:af4af28f0975, 2017-01-10 (annotated)

Committer:
lmboogaard
Date:
Tue Jan 10 11:32:26 2017 +0000
Revision:
0:af4af28f0975
test program for Mbed CLI; no SPI rate, no UART, no I2C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lmboogaard 0:af4af28f0975 1 #include "mbed.h"
lmboogaard 0:af4af28f0975 2 // Serial TX & RX interrupt loopback test using formatted IO - sprintf and sscanf
lmboogaard 0:af4af28f0975 3 // Connect TX to RX (p9 to p10)
lmboogaard 0:af4af28f0975 4 // or can also use USB and type back in the number printed out in a terminal window
lmboogaard 0:af4af28f0975 5 // Sends out ASCII numbers in a loop and reads them back
lmboogaard 0:af4af28f0975 6 // If not the same number LED4 goes on
lmboogaard 0:af4af28f0975 7 // LED1 and LED2 indicate RX and TX interrupt routine activity
lmboogaard 0:af4af28f0975 8 // LED3 changing indicate main loop running
lmboogaard 0:af4af28f0975 9
lmboogaard 0:af4af28f0975 10
lmboogaard 0:af4af28f0975 11 Serial device(PA_2, PA_3); // tx, rx
lmboogaard 0:af4af28f0975 12 // Can also use USB and type back in the number printed out in a terminal window
lmboogaard 0:af4af28f0975 13 // Serial monitor_device(USBTX, USBRX);
lmboogaard 0:af4af28f0975 14 DigitalOut led1(PB_3);
lmboogaard 0:af4af28f0975 15 DigitalOut led2(PB_4);
lmboogaard 0:af4af28f0975 16 DigitalOut led3(PB_5);
lmboogaard 0:af4af28f0975 17 DigitalOut led4(PB_6);
lmboogaard 0:af4af28f0975 18
lmboogaard 0:af4af28f0975 19 #define UART1_IRQn 1
lmboogaard 0:af4af28f0975 20
lmboogaard 0:af4af28f0975 21 int Serial_main(void);
lmboogaard 0:af4af28f0975 22 void Tx_interrupt();
lmboogaard 0:af4af28f0975 23 void Rx_interrupt();
lmboogaard 0:af4af28f0975 24 void send_line();
lmboogaard 0:af4af28f0975 25 void read_line();
lmboogaard 0:af4af28f0975 26 void NVIC_DisableIRQ(int IRQ);
lmboogaard 0:af4af28f0975 27 void NVIC_EnableIRQ(int IRQ);
lmboogaard 0:af4af28f0975 28
lmboogaard 0:af4af28f0975 29 // Circular buffers for serial TX and RX data - used by interrupt routines
lmboogaard 0:af4af28f0975 30 const int buffer_size = 255;
lmboogaard 0:af4af28f0975 31 // might need to increase buffer size for high baud rates
lmboogaard 0:af4af28f0975 32 char tx_buffer[buffer_size+1];
lmboogaard 0:af4af28f0975 33 char rx_buffer[buffer_size+1];
lmboogaard 0:af4af28f0975 34 // Circular buffer pointers
lmboogaard 0:af4af28f0975 35 // volatile makes read-modify-write atomic
lmboogaard 0:af4af28f0975 36 volatile int tx_in=0;
lmboogaard 0:af4af28f0975 37 volatile int tx_out=0;
lmboogaard 0:af4af28f0975 38 volatile int rx_in=0;
lmboogaard 0:af4af28f0975 39 volatile int rx_out=0;
lmboogaard 0:af4af28f0975 40 // Line buffers for sprintf and sscanf
lmboogaard 0:af4af28f0975 41 char tx_line[80];
lmboogaard 0:af4af28f0975 42 char rx_line[80];
lmboogaard 0:af4af28f0975 43
lmboogaard 0:af4af28f0975 44
lmboogaard 0:af4af28f0975 45 // main test program
lmboogaard 0:af4af28f0975 46 int Serial_main() {
lmboogaard 0:af4af28f0975 47 int i=0;
lmboogaard 0:af4af28f0975 48 int rx_i=0;
lmboogaard 0:af4af28f0975 49 device.baud(9600);
lmboogaard 0:af4af28f0975 50
lmboogaard 0:af4af28f0975 51 // Setup a serial interrupt function to receive data
lmboogaard 0:af4af28f0975 52 device.attach(&Rx_interrupt, Serial::RxIrq);
lmboogaard 0:af4af28f0975 53 // Setup a serial interrupt function to transmit data
lmboogaard 0:af4af28f0975 54 device.attach(&Tx_interrupt, Serial::TxIrq);
lmboogaard 0:af4af28f0975 55
lmboogaard 0:af4af28f0975 56 // Formatted IO test using send and receive serial interrupts
lmboogaard 0:af4af28f0975 57 // with sprintf and sscanf
lmboogaard 0:af4af28f0975 58 while (1) {
lmboogaard 0:af4af28f0975 59 // Loop to generate different test values - send value in hex, decimal, and octal and then read back
lmboogaard 0:af4af28f0975 60 for (i=0; i<0xFFFF; i++) {
lmboogaard 0:af4af28f0975 61 led3=1;
lmboogaard 0:af4af28f0975 62 // Print ASCII number to tx line buffer in hex
lmboogaard 0:af4af28f0975 63 sprintf(tx_line,"%x\r\n",i);
lmboogaard 0:af4af28f0975 64 // Copy tx line buffer to large tx buffer for tx interrupt routine
lmboogaard 0:af4af28f0975 65 send_line();
lmboogaard 0:af4af28f0975 66 // Print ASCII number to tx line buffer in decimal
lmboogaard 0:af4af28f0975 67 sprintf(tx_line,"%d\r\n",i);
lmboogaard 0:af4af28f0975 68 // Copy tx line buffer to large tx buffer for tx interrupt routine
lmboogaard 0:af4af28f0975 69 send_line();
lmboogaard 0:af4af28f0975 70 // Print ASCII number to tx line buffer in octal
lmboogaard 0:af4af28f0975 71 sprintf(tx_line,"%o\r\n",i);
lmboogaard 0:af4af28f0975 72 // Copy tx line buffer to large tx buffer for tx interrupt routine
lmboogaard 0:af4af28f0975 73 send_line();
lmboogaard 0:af4af28f0975 74 led3=0;
lmboogaard 0:af4af28f0975 75
lmboogaard 0:af4af28f0975 76 // Read a line from the large rx buffer from rx interrupt routine
lmboogaard 0:af4af28f0975 77 read_line();
lmboogaard 0:af4af28f0975 78 // Read ASCII number from rx line buffer
lmboogaard 0:af4af28f0975 79 sscanf(rx_line,"%x",&rx_i);
lmboogaard 0:af4af28f0975 80 // Check that numbers are the same
lmboogaard 0:af4af28f0975 81 if (i != rx_i) led4=1;
lmboogaard 0:af4af28f0975 82 // Read a line from the large rx buffer from rx interrupt routine
lmboogaard 0:af4af28f0975 83 read_line();
lmboogaard 0:af4af28f0975 84 // Read ASCII number from rx line buffer
lmboogaard 0:af4af28f0975 85 sscanf(rx_line,"%d",&rx_i);
lmboogaard 0:af4af28f0975 86 // Check that numbers are the same
lmboogaard 0:af4af28f0975 87 if (i != rx_i) led4=1;
lmboogaard 0:af4af28f0975 88 // Read a line from the large rx buffer from rx interrupt routine
lmboogaard 0:af4af28f0975 89 read_line();
lmboogaard 0:af4af28f0975 90 // Read ASCII number from rx line buffer
lmboogaard 0:af4af28f0975 91 sscanf(rx_line,"%o",&rx_i);
lmboogaard 0:af4af28f0975 92 // Check that numbers are the same
lmboogaard 0:af4af28f0975 93 if (i != rx_i) led4=1;
lmboogaard 0:af4af28f0975 94 }
lmboogaard 0:af4af28f0975 95 }
lmboogaard 0:af4af28f0975 96 }
lmboogaard 0:af4af28f0975 97
lmboogaard 0:af4af28f0975 98
lmboogaard 0:af4af28f0975 99 // Copy tx line buffer to large tx buffer for tx interrupt routine
lmboogaard 0:af4af28f0975 100 void send_line() {
lmboogaard 0:af4af28f0975 101 int i;
lmboogaard 0:af4af28f0975 102 char temp_char;
lmboogaard 0:af4af28f0975 103 bool empty;
lmboogaard 0:af4af28f0975 104 i = 0;
lmboogaard 0:af4af28f0975 105 // Start Critical Section - don't interrupt while changing global buffer variables
lmboogaard 0:af4af28f0975 106 NVIC_DisableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 107 empty = (tx_in == tx_out);
lmboogaard 0:af4af28f0975 108 while ((i==0) || (tx_line[i-1] != '\n')) {
lmboogaard 0:af4af28f0975 109 // Wait if buffer full
lmboogaard 0:af4af28f0975 110 if (((tx_in + 1) % buffer_size) == tx_out) {
lmboogaard 0:af4af28f0975 111 // End Critical Section - need to let interrupt routine empty buffer by sending
lmboogaard 0:af4af28f0975 112 NVIC_EnableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 113 while (((tx_in + 1) % buffer_size) == tx_out) {
lmboogaard 0:af4af28f0975 114 }
lmboogaard 0:af4af28f0975 115 // Start Critical Section - don't interrupt while changing global buffer variables
lmboogaard 0:af4af28f0975 116 NVIC_DisableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 117 }
lmboogaard 0:af4af28f0975 118 tx_buffer[tx_in] = tx_line[i];
lmboogaard 0:af4af28f0975 119 i++;
lmboogaard 0:af4af28f0975 120 tx_in = (tx_in + 1) % buffer_size;
lmboogaard 0:af4af28f0975 121 }
lmboogaard 0:af4af28f0975 122 if (device.writeable() && (empty)) {
lmboogaard 0:af4af28f0975 123 temp_char = tx_buffer[tx_out];
lmboogaard 0:af4af28f0975 124 tx_out = (tx_out + 1) % buffer_size;
lmboogaard 0:af4af28f0975 125 // Send first character to start tx interrupts, if stopped
lmboogaard 0:af4af28f0975 126 device.putc(temp_char);
lmboogaard 0:af4af28f0975 127 }
lmboogaard 0:af4af28f0975 128 // End Critical Section
lmboogaard 0:af4af28f0975 129 NVIC_EnableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 130 return;
lmboogaard 0:af4af28f0975 131 }
lmboogaard 0:af4af28f0975 132
lmboogaard 0:af4af28f0975 133
lmboogaard 0:af4af28f0975 134 // Read a line from the large rx buffer from rx interrupt routine
lmboogaard 0:af4af28f0975 135 void read_line() {
lmboogaard 0:af4af28f0975 136 int i;
lmboogaard 0:af4af28f0975 137 i = 0;
lmboogaard 0:af4af28f0975 138 // Start Critical Section - don't interrupt while changing global buffer variables
lmboogaard 0:af4af28f0975 139 NVIC_DisableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 140 // Loop reading rx buffer characters until end of line character
lmboogaard 0:af4af28f0975 141 while ((i==0) || (rx_line[i-1] != '\r')) {
lmboogaard 0:af4af28f0975 142 // Wait if buffer empty
lmboogaard 0:af4af28f0975 143 if (rx_in == rx_out) {
lmboogaard 0:af4af28f0975 144 // End Critical Section - need to allow rx interrupt to get new characters for buffer
lmboogaard 0:af4af28f0975 145 NVIC_EnableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 146 while (rx_in == rx_out) {
lmboogaard 0:af4af28f0975 147 }
lmboogaard 0:af4af28f0975 148 // Start Critical Section - don't interrupt while changing global buffer variables
lmboogaard 0:af4af28f0975 149 NVIC_DisableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 150 }
lmboogaard 0:af4af28f0975 151 rx_line[i] = rx_buffer[rx_out];
lmboogaard 0:af4af28f0975 152 i++;
lmboogaard 0:af4af28f0975 153 rx_out = (rx_out + 1) % buffer_size;
lmboogaard 0:af4af28f0975 154 }
lmboogaard 0:af4af28f0975 155 // End Critical Section
lmboogaard 0:af4af28f0975 156 NVIC_EnableIRQ(UART1_IRQn);
lmboogaard 0:af4af28f0975 157 rx_line[i-1] = 0;
lmboogaard 0:af4af28f0975 158 return;
lmboogaard 0:af4af28f0975 159 }
lmboogaard 0:af4af28f0975 160
lmboogaard 0:af4af28f0975 161
lmboogaard 0:af4af28f0975 162 // Interupt Routine to read in data from serial port
lmboogaard 0:af4af28f0975 163 void Rx_interrupt() {
lmboogaard 0:af4af28f0975 164 led1=1;
lmboogaard 0:af4af28f0975 165 // Loop just in case more than one character is in UART's receive FIFO buffer
lmboogaard 0:af4af28f0975 166 // Stop if buffer full
lmboogaard 0:af4af28f0975 167 while ((device.readable()) && (((rx_in + 1) % buffer_size) != rx_out)) {
lmboogaard 0:af4af28f0975 168 rx_buffer[rx_in] = device.getc();
lmboogaard 0:af4af28f0975 169 // Uncomment to Echo to USB serial to watch data flow
lmboogaard 0:af4af28f0975 170 // monitor_device.putc(rx_buffer[rx_in]);
lmboogaard 0:af4af28f0975 171 rx_in = (rx_in + 1) % buffer_size;
lmboogaard 0:af4af28f0975 172 }
lmboogaard 0:af4af28f0975 173 led1=0;
lmboogaard 0:af4af28f0975 174 return;
lmboogaard 0:af4af28f0975 175 }
lmboogaard 0:af4af28f0975 176
lmboogaard 0:af4af28f0975 177
lmboogaard 0:af4af28f0975 178 // Interupt Routine to write out data to serial port
lmboogaard 0:af4af28f0975 179 void Tx_interrupt() {
lmboogaard 0:af4af28f0975 180 led2=1;
lmboogaard 0:af4af28f0975 181 // Loop to fill more than one character in UART's transmit FIFO buffer
lmboogaard 0:af4af28f0975 182 // Stop if buffer empty
lmboogaard 0:af4af28f0975 183 while ((device.writeable()) && (tx_in != tx_out)) {
lmboogaard 0:af4af28f0975 184 device.putc(tx_buffer[tx_out]);
lmboogaard 0:af4af28f0975 185 tx_out = (tx_out + 1) % buffer_size;
lmboogaard 0:af4af28f0975 186 }
lmboogaard 0:af4af28f0975 187 led2=0;
lmboogaard 0:af4af28f0975 188 return;
lmboogaard 0:af4af28f0975 189 }
lmboogaard 0:af4af28f0975 190
lmboogaard 0:af4af28f0975 191 void NVIC_EnableIRQ(int IRQ){
lmboogaard 0:af4af28f0975 192 __enable_irq();
lmboogaard 0:af4af28f0975 193 }
lmboogaard 0:af4af28f0975 194
lmboogaard 0:af4af28f0975 195 void NVIC_DisableIRQ(int IRQ){
lmboogaard 0:af4af28f0975 196 __disable_irq();
lmboogaard 0:af4af28f0975 197 }