Content originally posted in LPCWare by woodchuck on Wed Apr 06 12:28:14 MST 2011
Would anyone know why the following sequence of instructions fails to get any activity out of the SSP of the LPC1114? I've jumped through all the hoops I can think of. Surely vectored interrupts aren't required to output a byte via SPI?!
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LPC_SYSCON->PRESETCTRL |= 1; // SSP0_RST_N set to 1
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<11); // enable SPI0 clock
LPC_SYSCON->SSP0CLKDIV = 0x01;
LPC_IOCON->PIO0_8 &= ~0x07;
LPC_IOCON->PIO0_8 |= 1; // config MISO
LPC_IOCON->PIO0_9 &= ~0x07;
LPC_IOCON->PIO0_9 |= 1; // config MOSI
LPC_IOCON->SCK_LOC = 0x01; // select SCK
LPC_IOCON->PIO2_11 = 0x01; // as p2.11
LPC_IOCON->PIO0_2 &= ~0x07; // Use SSP
LPC_IOCON->PIO0_2 |= 0x01; // SSEL
LPC_SSP0->CR0 = 0xEF07; // 8-bit, SPI, CPOL0, CPHA0, 100 KHz
LPC_SSP0->CPSR = 0x2; // this is the minumum divisor
LPC_SSP0->CR1 = 4; // select master mode
LPC_SSP0->CR1 |= 2; // enable SPI
LPC_SSP0->DR = 0x1234; // write something to tx fifo
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