Shreesha S / Mbed 2 deprecated spiDMAtest

SPI slave DMA-read program for FRDMKL46Z, verified, working

Dependencies:   SimpleDMA mbed-rtos mbed

main.cpp@4:33fc4fec3087, 2016-09-27 (annotated)

Committer:
shreeshas95
Date:
Tue Sep 27 10:39:48 2016 +0000
Revision:
4:33fc4fec3087
Parent:
3:e59d61aac1e1 
Simple test program for spi-DMA

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shreeshas95 0:f0f5102ed9ca 1 #include "mbed.h"
shreeshas95 0:f0f5102ed9ca 2 #include "SimpleDMA.h"
shreeshas95 0:f0f5102ed9ca 3 #include "dmaSPIslave.h"
shreeshas95 0:f0f5102ed9ca 4
shreeshas95 3:e59d61aac1e1 5 #define PAYLOAD_LENGTH 6723
shreeshas95 1:3cceef118195 6
shreeshas95 3:e59d61aac1e1 7 #define PAY_SPI_MOSI PTE18
shreeshas95 3:e59d61aac1e1 8 #define PAY_SPI_MISO PTE19
shreeshas95 3:e59d61aac1e1 9 #define PAY_SPI_CLK PTE17
shreeshas95 3:e59d61aac1e1 10 #define PAY_SPI_CS PTE16
shreeshas95 3:e59d61aac1e1 11
shreeshas95 3:e59d61aac1e1 12 dmaSPISlave spi(PAY_SPI_MOSI, PAY_SPI_MISO, PAY_SPI_CLK, PAY_SPI_CS);
shreeshas95 0:f0f5102ed9ca 13 RawSerial pc(USBTX, USBRX);
shreeshas95 4:33fc4fec3087 14 DigitalOut ledg(LED_GREEN);
shreeshas95 3:e59d61aac1e1 15 //DigitalOut ledr(LED_RED);
shreeshas95 0:f0f5102ed9ca 16
shreeshas95 1:3cceef118195 17 bool flag = false;
shreeshas95 1:3cceef118195 18
shreeshas95 1:3cceef118195 19 void do_this(void){
shreeshas95 1:3cceef118195 20 flag = true;
shreeshas95 1:3cceef118195 21 }
shreeshas95 1:3cceef118195 22
shreeshas95 0:f0f5102ed9ca 23 int main(){
shreeshas95 3:e59d61aac1e1 24 // ledr = 1;
shreeshas95 3:e59d61aac1e1 25 // ledg = 1;
shreeshas95 3:e59d61aac1e1 26 pc.baud(1200);
shreeshas95 0:f0f5102ed9ca 27 pc.printf("inside main\r\n");
shreeshas95 1:3cceef118195 28 spi.format(8,0);
shreeshas95 3:e59d61aac1e1 29 spi.frequency(1000000);
shreeshas95 0:f0f5102ed9ca 30
shreeshas95 1:3cceef118195 31 uint8_t buffer[PAYLOAD_LENGTH] = {0};
shreeshas95 0:f0f5102ed9ca 32 pc.printf("welcome to dma test, start sending data now\r\n");
shreeshas95 2:16545dbc88ae 33
shreeshas95 2:16545dbc88ae 34 // initialise the buffer for dma
shreeshas95 2:16545dbc88ae 35 spi.bulkRead_init(buffer, PAYLOAD_LENGTH, &do_this);
shreeshas95 2:16545dbc88ae 36 // start dma read
shreeshas95 2:16545dbc88ae 37 spi.bulkRead_start();
shreeshas95 0:f0f5102ed9ca 38
shreeshas95 1:3cceef118195 39 while(true){
shreeshas95 4:33fc4fec3087 40
shreeshas95 3:e59d61aac1e1 41 // int i = 0;
shreeshas95 3:e59d61aac1e1 42 // while(i < PAYLOAD_LENGTH){
shreeshas95 3:e59d61aac1e1 43 // if(spi.receive()){
shreeshas95 3:e59d61aac1e1 44 // buffer[i] = spi.read();
shreeshas95 3:e59d61aac1e1 45 // ++i;
shreeshas95 3:e59d61aac1e1 46 // }
shreeshas95 3:e59d61aac1e1 47 // }
shreeshas95 3:e59d61aac1e1 48 // ledr = !ledr;
shreeshas95 3:e59d61aac1e1 49 // for(int j = 0 ; j < PAYLOAD_LENGTH ; ++j){
shreeshas95 3:e59d61aac1e1 50 // printf("%02x ", buffer[j]);
shreeshas95 3:e59d61aac1e1 51 // }
shreeshas95 3:e59d61aac1e1 52
shreeshas95 3:e59d61aac1e1 53
shreeshas95 1:3cceef118195 54 if(flag){
shreeshas95 1:3cceef118195 55 flag = false;
shreeshas95 3:e59d61aac1e1 56
shreeshas95 2:16545dbc88ae 57 // start dma again after handling the data
shreeshas95 4:33fc4fec3087 58 spi.bulkRead_start();
shreeshas95 4:33fc4fec3087 59 ledg = !ledg;
shreeshas95 1:3cceef118195 60 }
shreeshas95 4:33fc4fec3087 61 }
shreeshas95 0:f0f5102ed9ca 62 }