MirrorSave
/
nodemcu-firmware
mirror of https://github.com/nodemcu/nodemcu-firmware.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #678 from devsaurus/dev-hspi_clockdiv 

Add divider for arbitrary HSPI clock frequencies, resolves #674
This commit is contained in:
devsaurus 2015-10-06 21:05:17 +02:00
parent 5e19b8488f d51ccb1e68
commit 093a895980
12 changed files with 34 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
README.md
View File

@ -405,7 +405,7 @@ All other pins can be assigned to any available GPIO:
Also refer to the initialization sequence eg in [u8g_graphics_test.lua](lua_examples/u8glib/u8g_graphics_test.lua):
```lua
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
```
@ -488,7 +488,7 @@ All other pins can be assigned to any available GPIO:
Also refer to the initialization sequence eg in [GraphicsTest.lua](lua_examples/ucglib/GraphicsRest.lua):
```lua
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
```
#####Library usage

21
app/driver/spi.c
View File

@ -64,7 +64,7 @@ void spi_lcd_9bit_write(uint8 spi_no,uint8 high_bit,uint8 low_8bit)
* Description : SPI master initial function for common byte units transmission
* Parameters : uint8 spi_no - SPI module number, Only "SPI" and "HSPI" are valid
*******************************************************************************/
void spi_master_init(uint8 spi_no, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock)
void spi_master_init(uint8 spi_no, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock_div)
{
uint32 regvalue;
@ -109,12 +109,21 @@ void spi_master_init(uint8 spi_no, unsigned cpol, unsigned cpha, unsigned databi
//clear Daul or Quad lines transmission mode
CLEAR_PERI_REG_MASK(SPI_CTRL(spi_no), SPI_QIO_MODE|SPI_DIO_MODE|SPI_DOUT_MODE|SPI_QOUT_MODE);
// SPI clock=CPU clock/8
// SPI clock = CPU clock / clock_div
// the divider needs to be a multiple of 2 to get a proper waveform shape
if ((clock_div & 0x01) != 0) {
// bump the divider to the next N*2
clock_div += 0x02;
}
clock_div >>= 1;
// clip to maximum possible CLKDIV_PRE
clock_div = clock_div > SPI_CLKDIV_PRE ? SPI_CLKDIV_PRE : clock_div - 1;
WRITE_PERI_REG(SPI_CLOCK(spi_no),
((1&SPI_CLKDIV_PRE)<<SPI_CLKDIV_PRE_S)|
((3&SPI_CLKCNT_N)<<SPI_CLKCNT_N_S)|
((1&SPI_CLKCNT_H)<<SPI_CLKCNT_H_S)|
((3&SPI_CLKCNT_L)<<SPI_CLKCNT_L_S)); //clear bit 31,set SPI clock div
((clock_div&SPI_CLKDIV_PRE)<<SPI_CLKDIV_PRE_S)|
((1&SPI_CLKCNT_N)<<SPI_CLKCNT_N_S)|
((0&SPI_CLKCNT_H)<<SPI_CLKCNT_H_S)|
((1&SPI_CLKCNT_L)<<SPI_CLKCNT_L_S)); //clear bit 31,set SPI clock div
//set 8bit output buffer length, the buffer is the low 8bit of register"SPI_FLASH_C0"
WRITE_PERI_REG(SPI_USER1(spi_no),

2
app/include/driver/spi.h
View File

@ -18,7 +18,7 @@ void spi_lcd_mode_init(uint8 spi_no);
void spi_lcd_9bit_write(uint8 spi_no,uint8 high_bit,uint8 low_8bit);
//spi master init funtion
void spi_master_init(uint8 spi_no, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock);
void spi_master_init(uint8 spi_no, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock_div);
//use spi send 8bit data
void spi_mast_byte_write(uint8 spi_no,uint8 *data);

10
app/modules/spi.c
View File

@ -7,7 +7,7 @@
#include "auxmods.h"
#include "lrotable.h"
// Lua: = spi.setup( id, mode, cpol, cpha, databits, clock )
// Lua: = spi.setup( id, mode, cpol, cpha, databits, clock_div )
static int spi_setup( lua_State *L )
{
unsigned id = luaL_checkinteger( L, 1 );
@ -15,7 +15,7 @@ static int spi_setup( lua_State *L )
unsigned cpol = luaL_checkinteger( L, 3 );
unsigned cpha = luaL_checkinteger( L, 4 );
unsigned databits = luaL_checkinteger( L, 5 );
uint32_t clock = luaL_checkinteger( L, 6 );
uint32_t clock_div = luaL_checkinteger( L, 6 );
MOD_CHECK_ID( spi, id );
@ -35,7 +35,11 @@ static int spi_setup( lua_State *L )
return luaL_error( L, "wrong arg type" );
}
u32 res = platform_spi_setup(id, mode, cpol, cpha, databits, clock);
if (clock_div < 4) {
return luaL_error( L, "invalid clock divider" );
}
u32 res = platform_spi_setup(id, mode, cpol, cpha, databits, clock_div);
lua_pushinteger( L, res );
return 1;
}

4
app/platform/platform.c
View File

@ -445,9 +445,9 @@ int platform_i2c_recv_byte( unsigned id, int ack ){
// *****************************************************************************
// SPI platform interface
uint32_t platform_spi_setup( unsigned id, int mode, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock)
uint32_t platform_spi_setup( unsigned id, int mode, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock_div)
{
spi_master_init(id, cpol, cpha, databits, clock);
spi_master_init(id, cpol, cpha, databits, clock_div);
return 1;
}

2
app/platform/platform.h
View File

@ -100,7 +100,7 @@ typedef uint32_t spi_data_type;
// The platform SPI functions
int platform_spi_exists( unsigned id );
uint32_t platform_spi_setup( unsigned id, int mode, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock);
uint32_t platform_spi_setup( unsigned id, int mode, unsigned cpol, unsigned cpha, unsigned databits, uint32_t clock_div);
spi_data_type platform_spi_send_recv( unsigned id, spi_data_type data );
void platform_spi_select( unsigned id, int is_select );

2
lua_examples/u8glib/u8g_bitmaps.lua
View File

@ -30,7 +30,7 @@ function init_spi_display()
local dc = 4 -- GPIO2
local res = 0 -- GPIO16
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
disp = u8g.ssd1306_128x64_hw_spi(cs, dc, res)
end

2
lua_examples/u8glib/u8g_graphics_test.lua
View File

@ -29,7 +29,7 @@ function init_spi_display()
local dc = 4 -- GPIO2
local res = 0 -- GPIO16
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
disp = u8g.ssd1306_128x64_hw_spi(cs, dc, res)
end

2
lua_examples/u8glib/u8g_rotation.lua
View File

@ -30,7 +30,7 @@ function init_spi_display()
local dc = 4 -- GPIO2
local res = 0 -- GPIO16
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
disp = u8g.ssd1306_128x64_hw_spi(cs, dc, res)
end

2
lua_examples/ucglib/GraphicsTest.lua
View File

@ -8,7 +8,7 @@ function init_spi_display()
local dc = 4 -- GPIO2
local res = 0 -- GPIO16
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
-- initialize the matching driver for your display
-- see app/include/ucg_config.h

2
lua_examples/ucglib/HelloWorld.lua
View File

@ -8,7 +8,7 @@ function init_spi_display()
local dc = 4 -- GPIO2
local res = 0 -- GPIO16
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
disp = ucg.ili9341_18x240x320_hw_spi(cs, dc, res)
end

2
lua_examples/ucglib/UcgLogo.lua
View File

@ -8,7 +8,7 @@ function init_spi_display()
local dc = 4 -- GPIO2
local res = 0 -- GPIO16
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 0)
spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, spi.DATABITS_8, 8)
disp = ucg.ili9341_18x240x320_hw_spi(cs, dc, res)
end