arduino/esp8266
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update README

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add some docu and todo
This commit is contained in:
Markus Sattler 2015-05-07 20:48:59 +02:00
parent ee5def9c8c
commit 7f4a10062b
2 changed files with 33 additions and 15 deletions
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3
README.md
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@ -132,7 +132,8 @@ else they default to pins 4(SDA) and 5(SCL).
#### SPI #### #### SPI ####
SPI library supports the entire Arduino SPI API including transactions, including setting phase and polarity. SPI library supports the entire Arduino SPI API including transactions, including setting phase (CPHA).
Setting the Clock polarity (CPOL) is not supported, yet (SPI_MODE2 and SPI_MODE3 not working).
#### ESP-specific APIs #### #### ESP-specific APIs ####

45
libraries/SPI/SPI.cpp
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@ -21,27 +21,39 @@
#include "SPI.h" #include "SPI.h"
#include "HardwareSerial.h" #include "HardwareSerial.h"
typedef struct { typedef struct {
uint32_t divider; uint32_t divider;
uint32_t regValue; union {
uint32_t regValue;
struct {
unsigned regL :6;
unsigned regH :6;
unsigned regN :6;
unsigned regPre :13;
unsigned regEQU :1;
};
};
} spiClockDiv_t; } spiClockDiv_t;
// todo find way of calculation for the divider
static const spiClockDiv_t spiClockDiv[] = { static const spiClockDiv_t spiClockDiv[] = {
{ 0, (0x80000000) }, ///< @80Mhz = 80 MHz @160Mhz = 160 MHz { 0, (0x80000000) }, ///< [0] EQU: 1 Pre: 0 N: 0 H: 0 L: 0 Div: 0 @80Mhz = 80 MHz @160Mhz = 160 MHz
{ 2, (0x00001001) }, ///< @80Mhz = 40 MHz @160Mhz = 80 MHz { 2, (0x00001001) }, ///< [1] EQU: 0 Pre: 0 N: 1 H: 0 L: 1 Div: 2 @80Mhz = 40 MHz @160Mhz = 80 MHz
{ 4, (0x00041001) }, ///< @80Mhz = 20 MHz @160Mhz = 40 MHz { 4, (0x00041001) }, ///< [2] EQU: 0 Pre: 1 N: 1 H: 0 L: 1 Div: 4 @80Mhz = 20 MHz @160Mhz = 40 MHz
{ 6, (0x000fffc0) }, ///< @80Mhz = 16 MHz @160Mhz = 32 MHz { 6, (0x000fffc0) }, ///< [3] EQU: 0 Pre: 3 N: 63 H: 63 L: 0 Div: 6 @80Mhz = 16 MHz @160Mhz = 32 MHz
{ 8, (0x000c1001) }, ///< @80Mhz = 10 MHz @160Mhz = 20 MHz { 8, (0x000c1001) }, ///< [4] EQU: 0 Pre: 3 N: 1 H: 0 L: 1 Div: 8 @80Mhz = 10 MHz @160Mhz = 20 MHz
{ 10, (0x00101001) }, ///< @80Mhz = 8 MHz @160Mhz = 16 MHz { 10, (0x00101001) }, ///< [5] EQU: 0 Pre: 4 N: 1 H: 0 L: 1 Div: 10 @80Mhz = 8 MHz @160Mhz = 16 MHz
{ 16, (0x001c1001) }, ///< @80Mhz = 5 MHz @160Mhz = 10 MHz { 16, (0x001c1001) }, ///< [6] EQU: 0 Pre: 7 N: 1 H: 0 L: 1 Div: 16 @80Mhz = 5 MHz @160Mhz = 10 MHz
{ 20, (0x00241001) }, ///< @80Mhz = 4 MHz @160Mhz = 8 MHz { 20, (0x00241001) }, ///< [7] EQU: 0 Pre: 9 N: 1 H: 0 L: 1 Div: 20 @80Mhz = 4 MHz @160Mhz = 8 MHz
{ 40, (0x004c1001) }, ///< @80Mhz = 2 MHz @160Mhz = 4 MHz { 40, (0x004c1001) }, ///< [8] EQU: 0 Pre: 19 N: 1 H: 0 L: 1 Div: 40 @80Mhz = 2 MHz @160Mhz = 4 MHz
{ 80, (0x009c1001) }, ///< @80Mhz = 1 MHz @160Mhz = 2 MHz { 80, (0x009c1001) }, ///< [9] EQU: 0 Pre: 39 N: 1 H: 0 L: 1 Div: 80 @80Mhz = 1 MHz @160Mhz = 2 MHz
{ 160, (0x013c1001) }, ///< @80Mhz = 500 KHz @160Mhz = 1 MHz { 160, (0x013c1001) }, ///< [10] EQU: 0 Pre: 79 N: 1 H: 0 L: 1 Div: 160 @80Mhz = 500 KHz @160Mhz = 1 MHz
{ 320, (0x027c1001) }, ///< @80Mhz = 250 KHz @160Mhz = 500 KHz { 320, (0x027c1001) }, ///< [11] EQU: 0 Pre: 159 N: 1 H: 0 L: 1 Div: 320 @80Mhz = 250 KHz @160Mhz = 500 KHz
{ 640, (0x04fc1001) } ///< @80Mhz = 125 KHz @160Mhz = 250 KHz { 640, (0x04fc1001) } ///< [12] EQU: 0 Pre: 319 N: 1 H: 0 L: 1 Div: 640 @80Mhz = 125 KHz @160Mhz = 250 KHz
}; };
static const uint8_t spiClockDiv_count = (sizeof(spiClockDiv) / sizeof(spiClockDiv_t)); static const uint8_t spiClockDiv_count = (sizeof(spiClockDiv) / sizeof(spiClockDiv_t));
SPIClass SPI; SPIClass SPI;
@ -53,6 +65,11 @@ void SPIClass::begin() {
pinMode(SCK, SPECIAL); ///< GPIO14 pinMode(SCK, SPECIAL); ///< GPIO14
pinMode(MISO, SPECIAL); ///< GPIO12 pinMode(MISO, SPECIAL); ///< GPIO12
pinMode(MOSI, SPECIAL); ///< GPIO13 pinMode(MOSI, SPECIAL); ///< GPIO13
/*
for(uint8_t i = 0; i < (spiClockDiv_count); i++) {
os_printf("[%d]\t EQU: %d\t Pre: %d\t N: %d\t H: %d\t L: %d\t Div: %d - %d\n", i, spiClockDiv[i].regEQU, spiClockDiv[i].regPre, spiClockDiv[i].regN, spiClockDiv[i].regH, spiClockDiv[i].regL, spiClockDiv[i].divider );
}
*/
GPMUX = 0x105; // note crash if SPI flash Frequency < 40MHz GPMUX = 0x105; // note crash if SPI flash Frequency < 40MHz
SPI1C = 0; SPI1C = 0;