a SPI Library for the ch32v003, a platform-agnostic library for the nRF24L01(+) and the actual example.
A SPI Library for the ch32v003, a platform-agnostic library for the nRF24L01(+) and the actual example.
## SPI library
The SPI library helps you configure the SPI registers.
Initially the idea was to make it arduino-compatible but GPL.
Initially the idea was to make it Arduino-compatible but GPL.
This is free-er.
Currently, only master-mode is supported, either R+W or W-only.
Then you can start talking on the SPI bus through SPI_read_x(), SPI_write_x() and, most importantly SPI_transfer_x(), where the x can be a 8 or 16 bit word (this is C, so no overloading).
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@@ -14,16 +14,17 @@ I welcome any improvements you may choose to make, it's far from complete or goo
CRC, for example, is not implemented yet and I'm incapable of making DMA easy, as the spi dac example showed the processor can be mostly "braindead" and the tiny chip can still output loads of data.
## nRF24L01(+) library
This is the doing of NAME HERE, I've just included a copy of his LIBRARY here and made some modifications.
This is the doing of [Reza Ebrahimi](https://github.com/ebrezadev), I've just included a copy of [his library](https://github.com/ebrezadev/nRF24L01-C-Driver) here and made some modifications.
## example
The example shows how to send either a uint8_t or a char[16].
To choose, move the comments.
The receiver-part is HERE, split in two because I don't know how to have the unified makefile recurse any differently.
The receiver-part is spi_24L01_rx, split in two because I don't know how to have the unified makefile recurse any differently.
You can enable / disable acknowledge mode by using "ACK_MODE" or "NO_ACK_MODE" in the call to nrf24_transmit().
### nRF module
Never connect the nRF module to 5V, it operates at 1.9-3.3V, much past that it will probably die!
Also, I've become convinced the briliant engineers at nordic are evil!
Also, I've become convinced the briliant engineers at nordic are evil!!
Thanks to nordics specifications in the datasheet, the chinese module manufacturers don't even pack 100nF onto the board as bypass caps!
Four hours of trouble-shooting later I stumbled upon the magic of adding a capacitor!!
For you see, as the IC transmits its packets, it draws huge amounts.. wrong!
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@@ -32,13 +33,15 @@ To the VCC and GND pins I added a 33uF 16V each. Though a 10uF ceramic capacitor
Can you imagine they saved 0.006$ and now we have to get out ye olde soldering iron so these work properly!!
#### pinout for ch32v003
Please check whether your module looks like THIS before using this pinout!
Please check whether your module looks like [THIS](https://www.circuitspecialists.com/content/552219/NRF24L01-RF-2.jpg) before using this pinout!
perspective: looking at the underside of the module, pin header in the top right corner
VCC 3V3 GND GND
CSN/SS C0 CE C4
MOSI C6 SCK C5
IRQ NC MISO C7
nRF | ch32 | nRF | ch32
--------|---------|-------|------
VCC | 3V3 | GND | GND
CSN/SS | C0 | CE | C4
MOSI | C6 | SCK | C5
IRQ | NC | MISO | C7
And then wire D4 to LED1 on the evaluation board.
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@@ -48,11 +51,12 @@ That's why there is a dir with Arduino files lurking in here on our christian se
#### pinout for Arduino
same perspective
VCC 3V3 GND GND
CSN/SS 9 CE 8
MOSI 11 SCK 13
IRQ NC MISO 12
nRF | UNO | nRF | UNO
--------|---------|-------|-------
VCC | 3V3 | GND | GND
CSN/SS | 9 | CE | 8
MOSI | 11 | SCK | 13
IRQ | NC | MISO | 12
And an LED on pin 4, for current-limiting resistor 1k is usually safe with 5V.
