Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-06-06 00:14:22 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

SAMA5 PWM: PWM driver is now functional

Browse Source
This commit is contained in:
Gregory Nutt
2013-11-07 09:17:46 -06:00
parent f9adc35bda
commit 90a2679031
2 changed files with 128 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files
configs/sama5d3x-ek/README.txt
+49 -30
View File
@@ -852,36 +852,40 @@ SAMA5 PWM Support
Where x=0..3. Where x=0..3.
Care must be taken because all PWM output pins conflict with some other Care must be taken because all PWM output pins conflict with some other
usage of the pin by other devices: usage of the pin by other devices. Furthermore, many of these pins have
not been brought out to an external connector:
-----+---+---+----+------+----------------
PWM PIN PER PIO I/O CONFLICTS
-----+---+---+----+------+----------------
PWM0 FI B PC28 J2.30 SPI1, ISI
H B PB0 --- GMAC
B PA20 J1.14 LCDC, ISI
L B PB1 --- GMAC
B PA21 J1.16 LCDC, ISI
-----+---+---+----+------+----------------
PWM1 FI B PC31 J2.36 HDMI
H B PB4 --- GMAC
B PA22 J1.18 LCDC, ISI
L B PB5 --- GMAC
B PE31 J3.20 ISI, HDMI
B PA23 J1.20 LCDC, ISI
-----+---+---+----+------+----------------
PWM2 FI B PC29 J2.29 UART0, ISI, HDMI
H C PD5 --- HSMCI0
B PB8 --- GMAC
L C PD6 --- HSMCI0
B PB9 --- GMAC
-----+---+---+----+------+----------------
PWM3 FI C PD16 --- SPI0, Audio
H C PD7 --- HSMCI0
B PB12 J3.7 GMAC
L C PD8 --- HSMCI0
B PB13 --- GMAC
-----+---+---+----+-------------------- -----+---+---+----+--------------------
PWM PIN PER PIO CONFLICTS
-----+---+---+----+-------------------- See configs/sama5d3x-ek/include/board.h for all of the default PWM
PWM0 FI B PC28 SPI1, ISI pin selections. I used PWM channel 0, pins PA20 and PA21 for testing.
H B PB0 GMAC
B PA20 LCDC, ISI
L B PB1 GMAC
B PA21 LCDC, ISI
-----+---+---+----+--------------------
PWM1 FI B PC31 HDMI
H B PB4 GMAC
B PA22 LCDC, ISI
L B PB5 GMAC
B PE31 ISI, HDMI
B PA23 LCDC, ISI
-----+---+---+----+--------------------
PWM2 FI B PC29 UART0, ISI, HDMI
H C PD5 HSMCI0
B PB8 GMAC
L C PD6 HSMCI0
B PB9 GMAC
-----+---+---+----+--------------------
PWM3 FI C PD16 SPI0, Audio
H C PD7 HSMCI0
B PB12 GMAC
L C PD8 HSMCI0
B PB13 GMAC
-----+---+---+----+--------------------
Clocking is addressed in the next paragraph. Clocking is addressed in the next paragraph.
@@ -889,7 +893,7 @@ SAMA5 PWM Support
----------------------- -----------------------
PWM Channels can be clocked from either a coarsely divided divided down PWM Channels can be clocked from either a coarsely divided divided down
MCK or from a custom frequency from PWM CLKA and/or CLKB. If you want MCK or from a custom frequency from PWM CLKA and/or CLKB. If you want
to use CLKA or CLKB, you must enable and configuratino them. to use CLKA or CLKB, you must enable and configure them.
System Type -> PWM Configuration System Type -> PWM Configuration
CONFIG_SAMA5_PWM_CLKA=y CONFIG_SAMA5_PWM_CLKA=y
@@ -901,7 +905,7 @@ SAMA5 PWM Support
for that channel: for that channel:
System Type -> PWM Configuration System Type -> PWM Configuration
CONFIG_SAMA5_PWM_CHANx_CLKA=y : Pick one of MCK, CLKA, or CLKB CONFIG_SAMA5_PWM_CHANx_CLKA=y : Pick one of MCK, CLKA, or CLKB (only)
CONFIG_SAMA5_PWM_CHANx_CLKB=y CONFIG_SAMA5_PWM_CHANx_CLKB=y
CONFIG_SAMA5_PWM_CHANx_MCK=y CONFIG_SAMA5_PWM_CHANx_MCK=y
CONFIG_SAMA5_PWM_CHANx_MCKDIV=128 : If MCK is selected, then the MCK divider must CONFIG_SAMA5_PWM_CHANx_MCKDIV=128 : If MCK is selected, then the MCK divider must
@@ -921,6 +925,21 @@ SAMA5 PWM Support
CONFIG_EXAMPLES_PWM_DEVPATH="/dev/pwm0" CONFIG_EXAMPLES_PWM_DEVPATH="/dev/pwm0"
CONFIG_EXAMPLES_PWM_FREQUENCY=100 CONFIG_EXAMPLES_PWM_FREQUENCY=100
Usage of the example is straightforward:
nsh> pwm -h
Usage: pwm [OPTIONS]
Arguments are "sticky". For example, once the PWM frequency is
specified, that frequency will be re-used until it is changed.
"sticky" OPTIONS include:
[-p devpath] selects the PWM device. Default: /dev/pwm0 Current: /dev/pwm0
[-f frequency] selects the pulse frequency. Default: 100 Hz Current: 100 Hz
[-d duty] selects the pulse duty as a percentage. Default: 50 % Current: 50 %
[-t duration] is the duration of the pulse train in seconds. Default: 5 Current: 5
[-h] shows this message and exits
OV2640 Camera interface OV2640 Camera interface
======================= =======================
configs/sama5d3x-ek/include/board.h
+79 -41
View File
@@ -178,56 +178,88 @@
/* PWM. There are no dedicated PWM output pins available to the user for PWM /* PWM. There are no dedicated PWM output pins available to the user for PWM
* testing. Care must be taken because all PWM output pins conflict with some other * testing. Care must be taken because all PWM output pins conflict with some other
* usage of the pin by other devices: * usage of the pin by other devices. Furthermore, many of these pins have not been
* brought out to an external connector:
* *
* -----+---+---+----+-------------------- * -----+---+---+----+------+----------------
* PWM PIN PER PIO CONFLICTS * PWM PIN PER PIO I/O CONFLICTS
* -----+---+---+----+-------------------- * -----+---+---+----+------+----------------
* PWM0 FI B PC28 SPI1, ISI * PWM0 FI B PC28 J2.30 SPI1, ISI
* H B PB0 GMAC * H B PB0 --- GMAC
* B PA20 LCDC, ISI * B PA20 J1.14 LCDC, ISI
* L B PB1 GMAC * L B PB1 --- GMAC
* B PA21 LCDC, ISI * B PA21 J1.16 LCDC, ISI
* -----+---+---+----+-------------------- * -----+---+---+----+------+----------------
* PWM1 FI B PC31 HDMI * PWM1 FI B PC31 J2.36 HDMI
* H B PB4 GMAC * H B PB4 --- GMAC
* B PA22 LCDC, ISI * B PA22 J1.18 LCDC, ISI
* L B PB5 GMAC * L B PB5 --- GMAC
* B PE31 ISI, HDMI * B PE31 J3.20 ISI, HDMI
* B PA23 LCDC, ISI * B PA23 J1.20 LCDC, ISI
* -----+---+---+----+-------------------- * -----+---+---+----+------+----------------
* PWM2 FI B PC29 UART0, ISI, HDMI * PWM2 FI B PC29 J2.29 UART0, ISI, HDMI
* H C PD5 HSMCI0 * H C PD5 --- HSMCI0
* B PB8 GMAC * B PB8 --- GMAC
* L C PD6 HSMCI0 * L C PD6 --- HSMCI0
* B PB9 GMAC * B PB9 --- GMAC
* -----+---+---+----+-------------------- * -----+---+---+----+------+----------------
* PWM3 FI C PD16 SPI0, Audio * PWM3 FI C PD16 --- SPI0, Audio
* H C PD7 HSMCI0 * H C PD7 --- HSMCI0
* B PB12 GMAC * B PB12 J3.7 GMAC
* L C PD8 HSMCI0 * L C PD8 --- HSMCI0
* B PB13 GMAC * B PB13 --- GMAC
* -----+---+---+----+-------------------- * -----+---+---+----+------+----------------
*/ */
#if !defined(CONFIG_SAMA5_GMAC) /* PWM channel 0:
*
* PA20 and PA21 can be used if the LCDC or ISI are not selected. These outputs are
* available on J1, pins 14 and 16, respectively.
*
* If the GMAC is not selected, then PB0 and PB1 could also be used. However,
* these pins are not available at the I/O expansion connectors.
*/
#if !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM0_H PIO_PWM0_H_2
# define PIO_PWM0_L PIO_PWM0_L_2
#elif !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM0_H PIO_PWM0_H_1 # define PIO_PWM0_H PIO_PWM0_H_1
# define PIO_PWM0_L PIO_PWM0_L_1 # define PIO_PWM0_L PIO_PWM0_L_1
#elif !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM0_H PIO_PWM0_H_2
# define PIO_PWM0_L PIO_PWM0_L_3
#endif #endif
#if !defined(CONFIG_SAMA5_GMAC) /* PWM channel 1:
# define PIO_PWM1_H PIO_PWM1_H_1 *
# define PIO_PWM1_L PIO_PWM1_L_1 * PA22 and PA23 can be used if the LCDC or ISI are not selected. These outputs are
#elif !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI) * available on J1, pins 18 and 20, respectively.
*
* PE31 can be used if the ISI is not selected (and the HDMI is not being used).
* That signal is available at J3 pin 20.
*
* If the GMAC is not selected, then PB4 and PB5 could also be used. However,
* these pins are not available at the I/O expansion connectors.
*/
#if !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM1_H PIO_PWM1_H_2 # define PIO_PWM1_H PIO_PWM1_H_2
#elif !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM1_H PIO_PWM1_H_1
#endif
#if !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM1_L PIO_PWM1_L_3 # define PIO_PWM1_L PIO_PWM1_L_3
#elif !defined(CONFIG_SAMA5_ISI) #elif !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM1_L PIO_PWM1_L_2 # define PIO_PWM1_L PIO_PWM1_L_2
#elif !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM1_L PIO_PWM1_L_1
#endif #endif
/* PWM channel 2:
*
* None of the output pin options are available at any of the I/O expansion
* connectors for PWM channel 2
*/
#if !defined(CONFIG_SAMA5_HSMCI0) #if !defined(CONFIG_SAMA5_HSMCI0)
# define PIO_PWM2_H PIO_PWM2_H_1 # define PIO_PWM2_H PIO_PWM2_H_1
# define PIO_PWM2_L PIO_PWM2_L_1 # define PIO_PWM2_L PIO_PWM2_L_1
@@ -236,12 +268,18 @@
# define PIO_PWM2_L PIO_PWM2_L_2 # define PIO_PWM2_L PIO_PWM2_L_2
#endif #endif
#if !defined(CONFIG_SAMA5_HSMCI0) /* PWM channel 3:
# define PIO_PWM3_H PIO_PWM3_H_1 *
# define PIO_PWM3_L PIO_PWM3_L_1 * If the GMAC is not selected, then PB12 can used and is available at J3 pin 7.
#elif !defined(CONFIG_SAMA5_GMAC) * None of the other output pins are accessible at the I/O expansion connectors.
*/
#if !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM3_H PIO_PWM3_H_2 # define PIO_PWM3_H PIO_PWM3_H_2
# define PIO_PWM3_L PIO_PWM3_L_2 # define PIO_PWM3_L PIO_PWM3_L_2
#elif !defined(CONFIG_SAMA5_HSMCI0)
# define PIO_PWM3_H PIO_PWM3_H_1
# define PIO_PWM3_L PIO_PWM3_L_1
#endif #endif
/************************************************************************************ /************************************************************************************