Tommy：Refactor: add Category:Projects

2026-08-21T05:17:39Z

Refactor: add [[Category:Projects ]]

←上個修訂		2026年8月21日 (五) 13:17的版本
第74行：		第74行：

	* [http://www.petervis.com/Raspberry_PI/SPI_Seria, Raspberry Pi SPI]		* [http://www.petervis.com/Raspberry_PI/SPI_Seria, Raspberry Pi SPI]

			[[Category:Projects]]

Tommy：已建立頁面，內容為 "SPI communication between RPi and LPC1768 == Hardware == RPi GPIO File:LPC1768_pinout.png|thumb|…"

2018-08-23T02:31:45Z

新頁面

[[File:PRi_SPI_LPC1768.jpg|border|350px|SPI communication between RPi and LPC1768]]
== Hardware ==
[[File:GPIOs.png|thumb|RPi GPIO]]
[[File:LPC1768_pinout.png|thumb|NXP LPC1768 pinout]]
[[File:spi_timing.png|thumb|SPI timing]]
<pre width=100>
RPi2 NXP LPC1768
MOSI(GPIO10) -- MOSI(p5)
MISO(GPIO09) -- MISO(p6)
SCLK(GPIO11) -- SCLK(p7)
CE0(GPIO08) -- (p8)
</pre>

== Software ==
* RPi using libbcm2835
** gcc -o spi spi.c -lbcm2835
** unknown why BCM2835_SPI_MODE1 is more stable??
<pre>
#include <bcm2835.h>
#include <stdio.h>

int main(int argc, char **argv)
{
if (!bcm2835_init())
return 1;

bcm2835_spi_begin();
bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST); // The default
bcm2835_spi_setDataMode(BCM2835_SPI_MODE1); // The default
bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_65536); // The default
bcm2835_spi_chipSelect(BCM2835_SPI_CS0); // The default
bcm2835_spi_setChipSelectPolarity(BCM2835_SPI_CS0, LOW); // the default

// Send a byte to the slave and simultaneously read a byte back from the slave
// If you tie MISO to MOSI, you should read back what was sent
uint8_t data = bcm2835_spi_transfer(0x12);
printf("Read from SPI: %02X\n", data);

bcm2835_spi_end();
bcm2835_close();
return 0;
}

</pre>

*NXP LPC1768

<pre>
#include "mbed.h"

SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel

Serial pc(USBTX, USBRX);
int main() {
device.reply(0x00); // Prime SPI with first reply
while(1) {
if(device.receive()) {
int v = device.read(); // Read byte from master
device.reply(v); // Make this the next reply
pc.printf("reply: %02x\n", v);
}
}
}
</pre>

== Reference ==
* [https://developer.mbed.org/questions/1331/How-to-Delay-SPI-Slave-to-Master-Respons/, How to Delay SPI Slave to Master Response?]

* [http://www.mathworks.com/help/supportpkg/raspberrypiio/ug/use-the-spi-interface-on-the-raspberry-pi-hardware.html, Use the Raspberry Pi SPI Interface to Connect to a Device]

* [http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus, wiki, Serial Peripheral Interface Bus]

* [http://www.airspayce.com/mikem/bcm2835/group__spi.html#gad623657d9513faa89d22ae1dc87eec38, libbcm2835]

* [http://www.petervis.com/Raspberry_PI/SPI_Seria, Raspberry Pi SPI]

Application - LPC1768, SPI communication - 修訂紀錄

Tommy：​Refactor: add Category:Projects

Tommy：​已建立頁面，內容為 "SPI communication between RPi and LPC1768 == Hardware == RPi GPIO File:LPC1768_pinout.png|thumb|…"

Tommy：Refactor: add Category:Projects

Tommy：已建立頁面，內容為 "SPI communication between RPi and LPC1768 == Hardware == RPi GPIO File:LPC1768_pinout.png|thumb|…"