John Tarasidis / Mbed 2 deprecated VGA

I2S speed test wip

Dependencies:   mbed

main.cpp@0:b847a1ffc64f, 2020-04-13 (annotated)

Committer:
jtarasidis
Date:
Mon Apr 13 14:01:48 2020 +0000
Revision:
0:b847a1ffc64f
Child:
1:3c1ad60f5cf3
stuck on i2s config

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jtarasidis 0:b847a1ffc64f 1 #include "mbed.h"
jtarasidis 0:b847a1ffc64f 2 //#include "SDFileSystem"
jtarasidis 0:b847a1ffc64f 3 //#include "FastIO.h"
jtarasidis 0:b847a1ffc64f 4 #include "MODDMA.h"
jtarasidis 0:b847a1ffc64f 5
jtarasidis 0:b847a1ffc64f 6
jtarasidis 0:b847a1ffc64f 7 void pllfeed() {
jtarasidis 0:b847a1ffc64f 8 __disable_irq();
jtarasidis 0:b847a1ffc64f 9 LPC_SC->PLL0FEED=0x000000aa;
jtarasidis 0:b847a1ffc64f 10 LPC_SC->PLL0FEED=0x00000055;
jtarasidis 0:b847a1ffc64f 11 __enable_irq();
jtarasidis 0:b847a1ffc64f 12 }
jtarasidis 0:b847a1ffc64f 13 void setpll() {
jtarasidis 0:b847a1ffc64f 14 // the MBED crystal oscillator is 12 MHz
jtarasidis 0:b847a1ffc64f 15 // main oscillator frequency 300 MHz: M = (300 x N) / (2 x 12)
jtarasidis 0:b847a1ffc64f 16 int n=2;
jtarasidis 0:b847a1ffc64f 17 int m=25;
jtarasidis 0:b847a1ffc64f 18 // processor clock 100 MHz = 300 MHz / D
jtarasidis 0:b847a1ffc64f 19 int d=3;
jtarasidis 0:b847a1ffc64f 20 // disconnect
jtarasidis 0:b847a1ffc64f 21 LPC_SC->PLL0CON=0x00000001; pllfeed();
jtarasidis 0:b847a1ffc64f 22 // disable
jtarasidis 0:b847a1ffc64f 23 LPC_SC->PLL0CON=0x00000000; pllfeed();
jtarasidis 0:b847a1ffc64f 24 // set new PLL values
jtarasidis 0:b847a1ffc64f 25 LPC_SC->PLL0CFG=((n-1)<<16)|(m-1); pllfeed();
jtarasidis 0:b847a1ffc64f 26 // enable
jtarasidis 0:b847a1ffc64f 27 LPC_SC->PLL0CON=0x00000001; pllfeed();
jtarasidis 0:b847a1ffc64f 28 // set cpu clock divider
jtarasidis 0:b847a1ffc64f 29 LPC_SC->CCLKCFG=d-1;
jtarasidis 0:b847a1ffc64f 30 // wait for lock
jtarasidis 0:b847a1ffc64f 31 while (LPC_SC->PLL0STAT&0x04000000==0);
jtarasidis 0:b847a1ffc64f 32 // connect
jtarasidis 0:b847a1ffc64f 33 LPC_SC->PLL0CON=0x00000003; pllfeed();
jtarasidis 0:b847a1ffc64f 34 }
jtarasidis 0:b847a1ffc64f 35
jtarasidis 0:b847a1ffc64f 36
jtarasidis 0:b847a1ffc64f 37 DigitalOut led1(LED1);
jtarasidis 0:b847a1ffc64f 38 DigitalOut led2(LED2);
jtarasidis 0:b847a1ffc64f 39
jtarasidis 0:b847a1ffc64f 40 MODDMA dma;
jtarasidis 0:b847a1ffc64f 41
jtarasidis 0:b847a1ffc64f 42 void TC0_callback(void) {
jtarasidis 0:b847a1ffc64f 43 led1 = 1;
jtarasidis 0:b847a1ffc64f 44 }
jtarasidis 0:b847a1ffc64f 45
jtarasidis 0:b847a1ffc64f 46 Serial test(p13, p14);
jtarasidis 0:b847a1ffc64f 47
jtarasidis 0:b847a1ffc64f 48 int main() {
jtarasidis 0:b847a1ffc64f 49 setpll();
jtarasidis 0:b847a1ffc64f 50 pllfeed();
jtarasidis 0:b847a1ffc64f 51
jtarasidis 0:b847a1ffc64f 52 char s[] = "I2S CCLK/4 Verification Test";
jtarasidis 0:b847a1ffc64f 53
jtarasidis 0:b847a1ffc64f 54 //turn on i2s periph
jtarasidis 0:b847a1ffc64f 55 LPC_SC -> PCONP |= (1 << 27);
jtarasidis 0:b847a1ffc64f 56
jtarasidis 0:b847a1ffc64f 57 //set PCLK_peripheral = CCLK/2; such that bitstream is CCLK/4
jtarasidis 0:b847a1ffc64f 58 LPC_SC -> PCLKSEL1 |= (2 << 22);
jtarasidis 0:b847a1ffc64f 59
jtarasidis 0:b847a1ffc64f 60 //monaural format; master mode
jtarasidis 0:b847a1ffc64f 61 LPC_I2S -> I2SDAO |= (0x8);
jtarasidis 0:b847a1ffc64f 62
jtarasidis 0:b847a1ffc64f 63 //connect i2s channel 0 tx to dma
jtarasidis 0:b847a1ffc64f 64 LPC_I2S -> I2SDMA1 |= (0x80002);
jtarasidis 0:b847a1ffc64f 65
jtarasidis 0:b847a1ffc64f 66 //select p5 pin for i2s tx
jtarasidis 0:b847a1ffc64f 67 LPC_PINCON -> PINSEL0 |= (1 << 18);
jtarasidis 0:b847a1ffc64f 68
jtarasidis 0:b847a1ffc64f 69
jtarasidis 0:b847a1ffc64f 70 MODDMA_Config *config = new MODDMA_Config;
jtarasidis 0:b847a1ffc64f 71 config
jtarasidis 0:b847a1ffc64f 72 ->channelNum ( MODDMA::Channel_0 )
jtarasidis 0:b847a1ffc64f 73 ->srcMemAddr ( (uint32_t) &s )
jtarasidis 0:b847a1ffc64f 74 ->dstMemAddr ( 0 )
jtarasidis 0:b847a1ffc64f 75 ->transferSize ( sizeof(s) )
jtarasidis 0:b847a1ffc64f 76 ->transferType ( MODDMA::m2p )
jtarasidis 0:b847a1ffc64f 77 ->transferWidth ( 8 )
jtarasidis 0:b847a1ffc64f 78 ->srcConn ( 0 )
jtarasidis 0:b847a1ffc64f 79 ->dstConn ( MODDMA::I2S_Channel_0 )
jtarasidis 0:b847a1ffc64f 80 ->dmaLLI ( 0 )
jtarasidis 0:b847a1ffc64f 81 ->attach_tc ( &TC0_callback )
jtarasidis 0:b847a1ffc64f 82 ;
jtarasidis 0:b847a1ffc64f 83
jtarasidis 0:b847a1ffc64f 84 dma.Setup(config);
jtarasidis 0:b847a1ffc64f 85 dma.Enable(config);
jtarasidis 0:b847a1ffc64f 86 while(1) {
jtarasidis 0:b847a1ffc64f 87 printf("%d ;", LPC_I2S -> I2SSTATE);
jtarasidis 0:b847a1ffc64f 88 wait(0.5);
jtarasidis 0:b847a1ffc64f 89 }
jtarasidis 0:b847a1ffc64f 90 }
jtarasidis 0:b847a1ffc64f 91