gpio寄存器的說明
示例參考最後
3.6 Control Register
3.6.1 IO_MUX_CENTRAL_PIN_RF Register Address Map
Base address: 0x402A0000
Base address(Set Reg): 0x402A1000
Base address(Clear Reg): 0x402A2000
主要分為PIN_CTRLX，主要是片内外設的一些控制器的控制
以GPIO32為例
1 模式的選擇
GPIO32對IO_MUX_CENTRAL_PIN_RF（位址為0x402A0000）的偏移
| 0x01EC | GPIO32 | GPIO32 |
一個引腳往往可以複用
展訊的每個引腳複用情況一般在SL8521E_GPIO_Spec_V1.0.xlsx表格裡說明
| 24 | B13 | GPIO32 | VIO1V8 | 1.8V,4.7K/20K | 50K | PWMA | O | DBG_BUS13(G0) | O | GPIO32 | I/O/T |
比如GPIO32就可以作為好幾個功能引腳
Function1 為空
Function2 PWMA
Function3 DBG_BUS13(G0)
Function4 GPIO32
這裡Function的選擇，就是通過GPIO32_fun_sel來選擇的，比如設定為3的話，那麼GPIO32引腳就設定成了GPIO模式，設定為1的話，就設定成了PWMA模式
2 gpio的控制
6.27.1 Overview
The GPIO module provides general purpose input and output signals. many of the GPIO pins are
multiplexed with other functions and system design trade-off must be exercised on selecting them.
All the GPIO pins can be programmed to be either input or output. When in input mode, they can
be programmed to trigger interrupt to the MCU.
#define GPIO_GROUP_NR (16)
int sprd_gpio_write(struct gpio_chip *chip, uint32_t offset,
uint32_t reg, int value)
{
struct sprd_gpio_chip *sprd_gpio = to_sprd_gpio(chip);
int group = offset / GPIO_GROUP_NR;
int bitof = offset & (GPIO_GROUP_NR - 1);
unsigned long addr = sprd_gpio->base_addr +
sprd_gpio->group_offset * group + reg;
int ret;
if (value)
ret = sprd_gpio->set_bits(chip, 1 << bitof, addr);
else
ret = sprd_gpio->clr_bits(chip, 1 << bitof, addr);
return ret;
}
gpio的值 方向 輸出的值是由一組寄存器控制的，每16個GPIO為一組，每個組的偏移值為0x80
比如 GPIO0-GPIO15 為第一組，偏移值為0，寄存器基位址為0x40280000
GPIO16-GPIO31為第二組，偏移值為0x80，寄存器基位址為0x40280080
GPIO32-GPIO47為第三組，偏移值為0x100，寄存器基位址為0x40280100
GPIO48-GPIO63為第三組，偏移值為0x180，寄存器基位址為0x40280180
GPIO64-GPIO79為第三組，偏移值為0x200，寄存器基位址為0x40280200
GPIO80-GPIO95為第三組，偏移值為0x280，寄存器基位址為0x40280280
GPIO96-GPIO111為第三組，偏移值為0x300，寄存器基位址為0x40280300
GPIO112-GPIO127為第三組，偏移值為0x380，寄存器基位址為0x40280380
GPIO128-GPIO143為第三組，偏移值為0x400，寄存器基位址為0x40280400
GPIO144-GPIO159為第三組，偏移值為0x480，寄存器基位址為0x40280480
GPIO160-GPIO175為第三組，偏移值為0x500，寄存器基位址為0x40280500
依次類推
每組寄存器的功能如下宏和表格所示
偏移值為0，反應data值
偏移值為4，反應data MASK
偏移值為8，反應DIR方向
#define REG_GPIO_DATA (0x0000)
#define REG_GPIO_DMSK (0x0004)
#define REG_GPIO_DIR (0x0008)
#define REG_GPIO_IS (0x000c)
#define REG_GPIO_IBE (0x0010)
#define REG_GPIO_IEV (0x0014)
#define REG_GPIO_IE (0x0018)
#define REG_GPIO_RIS (0x001c)
#define REG_GPIO_MIS (0x0020)
#define REG_GPIO_IC (0x0024)
#define REG_GPIO_INEN (0x0028)
| 0x0000 | GPIODATA | GPIO bits data |
| 0x0004 | GPIODMSK | GPIO bits data mask |
| 0x0008 | GPIODIR | GPIO bits data direction |
| 0x000C | GPIOIS | GPIO bits interrupt sense |
| 0x0010 | GPIOIBE | GPIO bits both edges interrupt |
| 0x0014 | GPIOIEV | GPIO bits interrupt event |
| 0x0018 | GPIOIE | GPIO bits interrupt enable |
| 0x001C | GPIORIS | GPIO bits raw interrupt status |
| 0x0020 | GPIOMIS | GPIO bits masked interrupt status |
| 0x0024 | GPIOIC | GPIO bits interrupt clear |
| 0x0028 | GPIOINEN | GPIO input enable |
GPIODATA寄存器，可以反映出gpio bits data input
3 上下拉 驅動電流的控制
DRV driver strength
WPUS pull up resistor select
SE schmitt trigger input enable
WPU weakly pull up for function mode
WPDO weakly pull down for function mode
slp_WPU weak pull up control in chip deep sleep mode
slp_WPDO weak pull down control in chip deep sleep mode
PIN_NAME_slp_ie Input enable control in chip deep sleep mode
PIN_NAME_slp_oe Output enable control in chip deep sleep mode
PIN_NAME_slp_en
Sleep mode enable:
BIT0: Sleep with AP sleep
BIT1: Sleep with PUBCP sleep
BIT2: Sleep with WTLCP sleep
BIT3: Sleep with WCN sleep
BIT4: Sleep with CM4 sleep
#define BIT_PIN_SLP_CM4 ( BIT_17 )
#define BIT_PIN_SLP_WCN ( BIT_16 )
#define BIT_PIN_SLP_WTLCP ( BIT_15 )
#define BIT_PIN_SLP_PUBCP ( BIT_14 )
#define BIT_PIN_SLP_AP ( BIT_13 )
=========================================================
示例1
gpio32
模式的選擇
/system/bin/r 0x402A01EC
402a01ec: 00000030 //表明設定的是GPIO模式
值和方向的控制
/system/bin/r 0x40280100 值
/system/bin/r 0x40280104 mask
/system/bin/r 0x40280108 direction
---------------------------------------------------
示例2
gpio31
模式的選擇
/system/bin/r 0x402A01E8
402a01e8: 00000030 //表明設定的是GPIO模式
值和方向的控制
/system/bin/r 0x40280080 值
40280080: 00008000//表明為高電平
40280080: 00000000//表明為低電平
/system/bin/r 0x40280084 mask
/system/bin/r 0x40280088 direction