Hello, I've configured SPI bus on P0.2 (SCLK), P0.3(MISO), P0.4 (MOSI) and P0.5 (NSS) but on these ports: no signal. Normaly, I should have SPI clock at least but I have nothing.
I've configured :
1) Pins:
sbit SPI_SCLK=P0^2; // SPI clock on P0.2 sbit SPI_MISO=P0^3; // Master In/Slave Out on P0.3 sbit SPI_MOSI=P0^4; // Master Out/Slave In on P0.4 sbit SPI_NSS=P0^5; // Slave Select on P0.5
2) Ports:
void port_init (void) { char sfrpage_save = SFRPAGE; // Save current page of SFR SFRPAGE = CONFIG_PAGE; // Load config_page WDTCN = 0xde; WDTCN = 0xad; // Disable watchdog timer XBR0 = 0x02; // Enable SPI bus XBR1 = 0x00; // Enable /INT0 and /INT1 XBR2 = 0x40; // Enable Crossbar and weak pull-up P0MDOUT |= 0x3C; // P0.5, P0.4, P0.3 and P0.2 are outputs (for SPI datas) P0 = 0x3C; SFRPAGE = sfrpage_save; // Restore SFR page }
3) SPI bus:
void config_SPI (void) { char sfrpage_save = SFRPAGE; // Save current SFR page SFRPAGE = SPI0_PAGE; // Load SPI page SPI0CFG |= 0x40; // Master Mode Enable SPI0CN |= 0x8D; // Slave select and enable SPI SPI0CKR = 0x01; // SYSCLK/2 SFRPAGE = sfrpage_save; // Restore SFR page }
I have tried many times to resolve the problem but without satisfaction for the moment.
If you can help me, make it please. Thanks.
Manu
XBR0 = 0x06; // Enable SPI bus XBR1 = 0x14; // Enable /INT0 and /INT1 XBR2 = 0x40; // Enable Crossbar and weak pull-up P0MDOUT = 0x38; // P0.5, P0.4, P0.3 and P0.2 are outputs (for SPI datas
PLEASE do not comment incorrectly, I were just about to post "your pinnings are wrong' when I realized that
XBR0 = 0x06; // Enable SPI bus is XBR0 = 0x06; // Enable UART0 and SPI bus
some of us will gladly help you, but if you make it more difficult to help you than need be such help will soon fade away.
Now, if you read the datasheet very carefully, you will find a little well hidden nugget which is that SPI must be initialized before the crossbar, since SPI init is the only place the (non)existence of NSS is known.
Erik