Diff: libs/spi.cpp

Revision:

3:f151d08d335c

Parent:

2:1df0b61d3b5a

--- a/libs/spi.cpp	Fri Feb 28 18:52:52 2014 -0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,244 +0,0 @@
-#include "spi.h"
-
-#include "lpc17xx_clkpwr.h"
-#include "lpc17xx_pinsel.h"
-#include "lpc17xx_ssp.h"
-#include "lpc17xx_gpio.h"
-
-#include <stdio.h>
-
-SPI* SPI::isr_dispatch[N_SPI_INTERRUPT_ROUTINES];
-
-class DMA;
-
-SPI::SPI(PinName mosi, PinName miso, PinName sclk)
-{
-    this->mosi.port = (mosi >> 5) & 7;
-    this->mosi.pin = mosi & 0x1F;
-
-    this->miso.port = (miso >> 5) & 7;
-    this->miso.pin = miso & 0x1F;
-
-    this->sclk.port = (sclk >> 5) & 7;
-    this->sclk.pin = sclk & 0x1F;
-
-    FIO_SetDir(this->mosi.port, 1UL << this->mosi.pin, 1);
-    FIO_SetDir(this->miso.port, 1UL << this->miso.pin, 0);
-    FIO_SetDir(this->sclk.port, 1UL << this->sclk.pin, 1);
-
-    if (mosi == P0_9 && miso == P0_8 && sclk == P0_7)
-    {
-//         iprintf("SPI: using 0.7,0.8,0.9 with SSP1\n");
-        // SSP1 on 0.7,0.8,0.9
-        sspr = LPC_SSP1;
-        isr_dispatch[1] = this;
-
-        LPC_PINCON->PINSEL0 &= ~((3 << (7*2)) | (3 << (8*2)) | (3 << (9*2)));
-        LPC_PINCON->PINSEL0 |=  ((2 << (7*2)) | (2 << (8*2)) | (2 << (9*2)));
-
-        LPC_SC->PCLKSEL0 &= 0xFFCFFFFF;
-        LPC_SC->PCLKSEL0 |= 0x00100000;
-
-        LPC_SC->PCONP |= CLKPWR_PCONP_PCSSP1;
-    }
-    else if (mosi == P0_18 && miso == P0_17 && sclk == P0_15)
-    {
-//         iprintf("SPI: using 0.15,0.17,0.18 with SSP0\n");
-        // SSP0 on 0.15,0.16,0.17,0.18
-        sspr = LPC_SSP0;
-        isr_dispatch[0] = this;
-
-        LPC_PINCON->PINSEL0 &= ~(3 << (15*2));
-        LPC_PINCON->PINSEL0 |=  (2 << (15*2));
-        LPC_PINCON->PINSEL1 &= ~( (3 << ((17*2)&30)) | (3 << ((18*2)&30)) );
-        LPC_PINCON->PINSEL1 |=  ( (2 << ((17*2)&30)) | (2 << ((18*2)&30)) );
-
-        LPC_SC->PCLKSEL1 &= 0xFFFFF3FF;
-        LPC_SC->PCLKSEL1 |= 0x00000400;
-
-        LPC_SC->PCONP |= CLKPWR_PCONP_PCSSP0;
-    }
-    else if (mosi == P1_24 && miso == P1_23 && sclk == P1_20)
-    {
-//         iprintf("SPI: using 1.20,1.23,1.24 with SSP0\n");
-        // SSP0 on 1.20,1.23,1.24
-        sspr = LPC_SSP0;
-        isr_dispatch[0] = this;
-
-// //         LPC_PINCON->PINSEL3 &= 0xFFFC3CFF;
-//         LPC_PINCON->PINSEL3 |= 0x0003C300;
-
-//         LPC_PINCON->PINSEL3 &= ~( (3 << ((20*2)&30)) | (3 << ((23*2)&30)) | (3 << ((24*2)&30)) );
-        LPC_PINCON->PINSEL3 |=  ( (3 << ((20*2)&30)) | (3 << ((23*2)&30)) | (3 << ((24*2)&30)) );
-
-        LPC_SC->PCLKSEL1 &= 0xFFFFF3FF;
-        LPC_SC->PCLKSEL1 |= 0x00000400;
-
-        LPC_SC->PCONP |= CLKPWR_PCONP_PCSSP0;
-    }
-    else
-    {
-//         iprintf("SPI: using soft-SPI\n");
-        sspr = (LPC_SSP_TypeDef *) 0;
-    }
-
-    if (sspr) {
-        sspr->CR0 = SSP_DATABIT_8 |
-                    SSP_FRAME_SPI;
-        sspr->CR1 = SSP_MASTER_MODE;
-        frequency(10000);
-        sspr->CR1 |= SSP_CR1_SSP_EN;
-    }
-}
-
-SPI::~SPI()
-{
-    if (sspr == LPC_SSP0)
-        LPC_SC->PCONP &= CLKPWR_PCONP_PCSSP0;
-    else if (sspr == LPC_SSP1)
-        LPC_SC->PCONP &= CLKPWR_PCONP_PCSSP1;
-}
-
-void SPI::frequency(uint32_t f)
-{
-    // CCLK = 25MHz
-    // CPSR = 2 to 254, even only
-    // CR0[8:15] (SCR, 0..255) is a further prescale
-
-//     iprintf("SPI: frequency %lu:", f);
-    delay = 25000000 / f;
-    // f = 25MHz / (CPSR . [SCR + 1])
-    // CPSR . (SCR + 1) = 25MHz / f
-    // min freq is 25MHz / (254 * 256)
-    if (sspr) {
-        if (f < 385) {
-            sspr->CPSR = 254;
-            sspr->CR0 &= 0x00FF;
-            sspr->CR0 |= 255 << 8;
-        }
-        // max freq is 25MHz / (2 * 1)
-        else if (f > 12500000) {
-            sspr->CPSR = 2;
-            sspr->CR0 &= 0x00FF;
-        }
-        else {
-            sspr->CPSR = delay & 0xFE;
-            // CPSR . (SCR + 1) = f;
-            // (SCR + 1) = f / CPSR;
-            // SCR = (f / CPSR) - 1
-            sspr->CR0 &= 0x00FF;
-            sspr->CR0 |= (((delay / sspr->CPSR) - 1) & 0xFF) << 8;
-        }
-//         iprintf(" CPSR=%lu, CR0=%lu", sspr->CPSR, sspr->CR0);
-    }
-//    iprintf("\n");
-}
-
-void _delay(uint32_t ticks) {
-    for (;ticks;ticks--)
-        asm volatile("nop\n\t");
-}
-
-uint8_t SPI::write(uint8_t data)
-{
-//     _cs = 1;
-    uint8_t r = 0;
-//     iprintf("SPI: >0x%02X", data);
-    if (sspr) {
-        while ((sspr->SR & SSP_SR_TNF) == 0);
-        sspr->DR = data;
-        while ((sspr->SR & SSP_SR_RNE) == 0);
-        r = sspr->DR & 255;
-    }
-    else {
-        for (int i = 0; i < 8; i++) {
-            FIO_ClearValue(sclk.port, 1UL << sclk.pin);         // clock LOW
-
-            if (data & 0x80)                                    // WRITE
-                FIO_SetValue(mosi.port, 1UL << mosi.pin);
-            else
-                FIO_ClearValue(mosi.port, 1UL << mosi.pin);
-            data <<= 1;
-
-            _delay(delay >> 1);                                 // DELAY
-
-            FIO_SetValue(sclk.port, 1UL << sclk.pin);           // clock HIGH
-
-            _delay(delay >> 1);                                 // DELAY
-
-            r <<= 1;
-            if (FIO_ReadValue(miso.port) & (1UL << miso.pin))   // READ
-                r |= 1;
-        }
-        FIO_ClearValue(sclk.port, 1UL << sclk.pin);
-    }
-//     iprintf(" <0x%02X\n", r);
-    return r;
-}
-
-// TODO: timer feeds DMA feeds 0xFFs to card then we listen for responses using our interrupt
-// allow me to do something like:
-// disk.start_multi_write(int blocks, int blocksize, void *buffer);
-// enable_usb_isr();
-// [...]
-// usb_isr() {
-//    if (disk.buffer_in_use(void *buffer))
-//        return;
-//    usb_ep_read(buffer);
-//    if (buffer_full)
-//        disk.validate_buffer(buffer);
-//    if (disk.finished_transfer())
-//        disk.end_multi_write();
-// };
-
-bool SPI::can_DMA()
-{
-    return (sspr != NULL);
-}
-
-// int SPI::setup_DMA_rx(DMA_REG *dma)
-// {
-//     if (!sspr)
-//         return -1;
-//
-//     dma->DMACCControl = 0;
-//     dma->DMACCConfiguration = 0;
-//     if (sspr == LPC_SSP0)
-//         dma->DMACCConfiguration |= (GPDMA_CONN_SSP0_Rx << 6);
-//     if (sspr == LPC_SSP1)
-//         dma->DMACCConfiguration |= (GPDMA_CONN_SSP1_Rx << 6);
-//
-//     dma->DMACCConfiguration |= GPDMA_TRANSFERTYPE_M2P << 11;
-//     return 0;
-// }
-//
-// int SPI::start_DMA_rx(DMA_REG *dma)
-// {
-//     dma->DMACCConfiguration |=
-// }
-
-// int SPI::writeblock(uint8_t *block, int blocklen)
-// {
-//     static DMA *d = new DMA();
-//     d.sourceaddr(block);
-//     d.transferlength(blocklen);
-//     d.destinationperipheral(sspr);
-//     d.start();
-//     while (d.active());
-//     return blocklen;
-//     return 0;
-// }
-
-void SPI::irq()
-{
-}
-
-void SSP0_IRQHandler(void) {
-    if (SPI::isr_dispatch[0])
-        SPI::isr_dispatch[0]->irq();
-}
-
-void SSP1_IRQHandler(void) {
-    if (SPI::isr_dispatch[1])
-        (SPI::isr_dispatch[1])->irq();
-}