YUM
Joined: 27 May 2004
Posts: 12
Location: Austria
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| SPI2 read does not work on dsPIC30F6014A |
 Posted: Thu Oct 27, 2011 7:52 am |
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Hello,
I do a simple read on the SPI2 of a dsPIC30F6014A.
No way to get it run - the read value is always 0x00.
Here is the code snippet of some settings:
| Code: |
/* */
/* global header */
/* YUM */
/* global.h, 06/11 */
/* compile with CCS - 4.119, MPLAB 8.76 */
#include <30F6014A.h>
#device *=16 adc=12
// due to a silicon bug of the PIC processor, the fuses are set manually:
#FUSES 1=0x8705
#FUSES 2=0x003F
#FUSES 3=0x87A3
#FUSES 4=0x310F
#FUSES 5=0x330F
#FUSES 6=0x0007
#FUSES 7=0xC003
#ZERO_RAM
#define VERSION 0x0611
#define Fosc 40000000
#ID VERSION
#TYPE SHORT=8, INT=16, LONG=32
#USE FIXED_IO(a_outputs=PIN_A6, PIN_A7, PIN_A9, PIN_A10, PIN_A13, PIN_A14, PIN_A15)
#USE FIXED_IO(b_outputs=PIN_B2, PIN_B3, PIN_B5, PIN_B6, PIN_B7, PIN_B8, PIN_B9, PIN_B10, PIN_B11, PIN_B14)
#USE FIXED_IO(c_outputs=PIN_C1, PIN_C2, PIN_C3, PIN_C4)
#USE FIXED_IO(d_outputs=)
#USE FIXED_IO(f_outputs=PIN_F6, PIN_F8)
#USE FIXED_IO(g_outputs=PIN_G6, PIN_G8, PIN_G9, PIN_G15)
#USE delay(clock = Fosc)
#use rs232(baud=9600, UART1, parity=N,bits=8)[b]
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Here is the code snippet of the subroutine:
| Code: | //------------------------------------------------------------------------
// read the keypad
char up_key_read_the_keypad(void)
{
char read_value;
setup_spi2(spi_master | SPI_MODE_0 |spi_clk_div_128 | SPI_MODE_8B);
CS_KEY_OFF();
CS_KEY_ON();
delay_us(10);
read_value = spi_read2(0xf3);
delay_us(10);
CS_KEY_OFF();
printf(" read value: %02X\r\n", read_value);
return read_value;
}
/*---------------------------------------------------------*/ |
Here is the screenshot of the signals and the serial test-output:
As you can see, all signals are present; the serial input (miso) is NOT static 0,
but most of the time 1, so changing the spi modes will not help.
The spi is even running very slowly.
Any ideas? |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Thu Oct 27, 2011 8:29 am |
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| I don't see SPI_MODE_0 defined in your code, thus I wonder what's missing else. But there's no obvious reason, why spi_read2 should read 0x00 with the shown waveforms, provided you connected the right SDI2 pin. |
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