stm32mp157无系统裸机之硬件I2C(I2C6,AP3216C)

sppz · 发表于 2020-12-25 16:49:25

本帖最后由 sppz 于 2020-12-26 10:46 编辑

1.stm32mp157裸机启动过程探寻
2.stm32mp157无系统裸机之中断(GIC)初窥门径
3.stm32mp157无系统裸机之定时器(TIM6)简单使用
4.stm32mp157无系统裸机之EXTI(WK_UP, KEY0, KEY1)按键

本篇为原子stm32mp157无系统裸机,个人框架(c++)下的第四篇[记录,总结,资料汇总].
本篇为I2C实验.实现了I2C6(AP3216C)简单使用.

--------分割线,以下为资料地址--------
stm32mp157参考手册
原子157硬件参考手册
AP3216C手册

sppz · 发表于 2020-12-25 16:50:07

本帖最后由 sppz 于 2020-12-26 10:55 编辑

便民措施:

px.zip (2.67 KB, 下载次数: 2)

sppz · 发表于 2020-12-25 16:50:46

本帖最后由 sppz 于 2020-12-26 11:00 编辑

I2C协议和AP3216C不细说,请大家自己查手册和教程.
GPIOA设置

{ // A.0 WK_UP, A.11 I2C6_SCL, A.12 I2C6_SDA
auto moder(GPIOA::MODER(0)); moder.MODE() = 0;
moder.index(11); moder.MODE() = 2;
moder.index(12); moder.MODE() = 2;
moder.push();
auto otyper(GPIOA::OTYPER(0)); otyper.OT() = 0;
otyper.index(11); otyper.OT() = 1; // 一定要是开漏!!!
otyper.index(12); otyper.OT() = 1; // 一定要是开漏!!!
otyper.push();
auto ospeedr(GPIOA::OSPEEDR(0)); ospeedr.OS() = 0;
ospeedr.index(11); ospeedr.OS() = 3;
ospeedr.index(12); ospeedr.OS() = 3;
ospeedr.push();
auto pupdr(GPIOA::PUPDR(0)); pupdr.PUPD() = 2;
pupdr.index(11); pupdr.PUPD() = 0;
pupdr.index(12); pupdr.PUPD() = 0;
pupdr.push();
auto afr(GPIOA::AFR(0)); afr.AF() = 0;
afr.index(11); afr.AF() = 2;
afr.index(12); afr.AF() = 2;
afr.push();
}

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I2C6初始化

static void initialize_i2c6() noexcept // clock default use apb5
{
auto mp_apb5ensetr(RCC::MP_APB5ENSETR());
mp_apb5ensetr.I2C6EN() = 1;
mp_apb5ensetr.push();
auto cr1(I2C6::CR1());
cr1.ANFOFF() = 1;
cr1.DNF() = 0;
cr1.NOSTRETCH() = 0;
cr1.push();
auto cr2(I2C6::CR2());
cr2.PECBYTE() = 0;
cr2.push();
//
auto timingr(I2C6::TIMINGR());
timingr.PRESC() = 5;
timingr.SCLL() = 24;
timingr.SCLH() = 24;
timingr.SDADEL() = 25;
timingr.SCLDEL() = 24;
timingr.push();
cr1.pull();
cr1.PE() = 1;
cr1.push();
}

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下图是此设置下协议波形(从PZ.6, PZ.7输出的I2C6的波形),大约400K?

sppz · 发表于 2020-12-25 16:51:14

本帖最后由 sppz 于 2020-12-26 11:03 编辑

I2C操作函数

static void i2c6_write1(unsigned_integer8 address, unsigned_integer8 data) noexcept
{
auto isr(I2C6::ISR());
while (isr.BUSY() == 1) { isr.pull(); };
auto cr2(I2C6::CR2());
cr2.SADD() = address;
cr2.RD_WRN() = 0;
cr2.ADD10() = 0;
cr2.NBYTES() = 1;
cr2.RELOAD() = 0;
cr2.AUTOEND() = 1;
cr2.START() = 1;
cr2.push();
do { isr.pull(); } while (isr.TXE() == 0);
auto txdr(I2C6::TXDR(data));
txdr.push();
}
static void i2c6_write2(unsigned_integer8 address, unsigned_integer8 data0, unsigned_integer8 data1) noexcept
{
auto isr(I2C6::ISR());
while (isr.BUSY() == 1) { isr.pull(); };
auto cr2(I2C6::CR2());
cr2.SADD() = address;
cr2.RD_WRN() = 0;
cr2.ADD10() = 0;
cr2.NBYTES() = 2;
cr2.RELOAD() = 0;
cr2.AUTOEND() = 1;
cr2.START() = 1;
cr2.push();
I2C6::TXDR_cache txdr;
do { isr.pull(); } while (isr.TXE() == 0);
txdr.TXDATA() = data0;
txdr.push();
do { isr.pull(); } while (isr.TXE() == 0);
txdr.TXDATA() = data1;
txdr.push();
}
static unsigned_integer8 i2c6_read(unsigned_integer8 address) noexcept
{
auto isr(I2C6::ISR());
while (isr.BUSY() == 1) { isr.pull(); };
auto cr2(I2C6::CR2());
cr2.SADD() = address;
cr2.RD_WRN() = 1;
cr2.ADD10() = 0;
cr2.NBYTES() = 1;
cr2.RELOAD() = 0;
cr2.AUTOEND() = 1;
cr2.START() = 1;
cr2.push();
do { isr.pull(); } while (isr.RXNE() == 0);
auto rxdr(I2C6::RXDR());
return rxdr.RXDATA();
}

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AP3216C的操作函数

static void ap3216c_write(unsigned_integer8 address, unsigned_integer8 data) noexcept
{
i2c6_write2(0x1e << 1, address, data); // 注意7位地址时,使用的是bit[1..7]
}
static unsigned_integer8 ap3216c_read(unsigned_integer8 address) noexcept
{
i2c6_write1(0x1e << 1, address); // 注意7位地址时,使用的是bit[1..7]
return i2c6_read(0x1e << 1);
}

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更新后的按键和TIM6

size systick_count(0);
void px_GIC_TIM6() noexcept //
{
auto sr(TIM6::SR());
sr.UIF() = 0;
sr.push();
++systick_count;
if (systick_count % 1000 == 0)
{
put_string("second=");
put_size(systick_count / 1000);
{
auto odr(GPIOF::ODR(3)); odr.OD() ^= 1;
odr.push();
}
put_string(" ap3216c");
put_string(" mode[0x0]="); put_size(ap3216c_read(0x0));
put_string(" PS_low[0xe]="); put_size(ap3216c_read(0xe));
put_string(" PS_high[0xf]="); put_size(ap3216c_read(0xf));
put_string("\r\n");
}
}
void px_GIC_EXTI3() noexcept // KEY0
{
auto rpr(EXTI::RPR(3));
if (rpr.RPIF() == 1)
{
rpr.value() = 0;
rpr.RPIF() = 1;
rpr.push();
}
auto fpr(EXTI::FPR(3));
if (fpr.FPIF() == 1)
{
fpr.value() = 0;
fpr.FPIF() = 1;
fpr.push();
}
put_string("KEY0 open ap3216c.\r\n");
ap3216c_write(0x0, 3);
}
void px_GIC_EXTI7() noexcept // KEY1
{
auto rpr(EXTI::RPR(7));
if (rpr.RPIF() == 1)
{
rpr.value() = 0;
rpr.RPIF() = 1;
rpr.push();
}
auto fpr(EXTI::FPR(7));
if (fpr.FPIF() == 1)
{
fpr.value() = 0;
fpr.FPIF() = 1;
fpr.push();
}
put_string("KEY1 close ap3216c.\r\n");
ap3216c_write(0x0, 0);
}

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sppz · 发表于 2020-12-25 16:52:03

本帖最后由 sppz 于 2020-12-26 11:06 编辑

记录下一些细节
1.I2C引脚需要设置为开漏.
2.AP3216C可以在远高于400K的情况下运行(虽然手册上说是400K).

记录下整个main文件

import px.base_object;
import px.cpu.stm32mp157.RCC;
import px.cpu.stm32mp157.GPIO;
import px.cpu.stm32mp157.USART;
import px.cpu.stm32mp157.GIC;
import px.cpu.stm32mp157.TIM;
import px.cpu.stm32mp157.EXTI;
import px.cpu.stm32mp157.I2C;
using namespace px_namespace;
using namespace px_namespace::cpu::stm32mp157;
static void reset_clock() noexcept
{
// clock use HSI
{
auto ocensetr(RCC::OCENSETR());
ocensetr.HSION() = 1;
ocensetr.push();
for (auto ocrdyr(RCC::OCRDYR()); ocrdyr.HSIRDY() == 0; ocrdyr.pull()) {}
auto hsicfgr(RCC::HSICFGR());
hsicfgr.HSIDIV() = 0;
hsicfgr.push();
for (auto ocrdyr(RCC::OCRDYR()); ocrdyr.HSIDIVRDY() == 0; ocrdyr.pull()) {}
auto mpckselr(RCC::MPCKSELR());
mpckselr.MPUSRC() = 0;
mpckselr.push();
do { mpckselr.pull(); } while (mpckselr.MPUSRCRDY() == 0);
auto axidivr(RCC::AXIDIVR());
axidivr.AXIDIV() = 0;
axidivr.push();
do { axidivr.pull(); } while (axidivr.AXIDIVRDY() == 0);
auto assckselr(RCC::ASSCKSELR());
assckselr.AXISSRC() = 0;
assckselr.push();
do { assckselr.pull(); } while (assckselr.AXISSRCRDY() == 0);
auto mcudivr(RCC::MCUDIVR());
mcudivr.MCUDIV() = 0;
mcudivr.push();
do { mcudivr.pull(); } while (mcudivr.MCUDIVRDY() == 0);
auto mssckselr(RCC::MSSCKSELR());
mssckselr.MCUSSRC() = 0;
mssckselr.push();
do { mssckselr.pull(); } while (mssckselr.MCUSSRCRDY() == 0);
}
// close PLLs
{
auto pll1cr(RCC::PLL1CR());
pll1cr.DIVPEN() = 0;
pll1cr.DIVQEN() = 0;
pll1cr.DIVREN() = 0;
pll1cr.push();
pll1cr.PLLON() = 0;
pll1cr.push();
do { pll1cr.pull(); } while (pll1cr.PLL1RDY() == 1);
auto pll2cr(RCC::PLL2CR());
pll2cr.DIVPEN() = 0;
pll2cr.DIVQEN() = 0;
pll2cr.DIVREN() = 0;
pll2cr.push();
pll2cr.PLLON() = 0;
pll2cr.push();
do { pll2cr.pull(); } while (pll2cr.PLL2RDY() == 1);
auto pll3cr(RCC::PLL3CR());
pll3cr.DIVPEN() = 0;
pll3cr.DIVQEN() = 0;
pll3cr.DIVREN() = 0;
pll3cr.push();
pll3cr.PLLON() = 0;
pll3cr.push();
do { pll3cr.pull(); } while (pll3cr.PLL3RDY() == 1);
auto pll4cr(RCC::PLL4CR());
pll4cr.DIVPEN() = 0;
pll4cr.DIVQEN() = 0;
pll4cr.DIVREN() = 0;
pll4cr.push();
pll4cr.PLLON() = 0;
pll4cr.push();
do { pll4cr.pull(); } while (pll4cr.PLL4RDY() == 1);
}
}
// MPU[PLL1_P] 600Mhz, AXI[PLL2_P] 266.5Mhz(reference Using the SSCG block), DDR[PLL2_R] 533Mhz, , MCU 200Mhz, APB[1-5] 100Mhz
static void set_clock() noexcept
{
// open HSE
{
auto ocensetr(RCC::OCENSETR());
ocensetr.HSEON();
ocensetr.push();
for (auto ocrdyr(RCC::OCRDYR()); ocrdyr.HSERDY() == 0; ocrdyr.pull()) {}
}
// PLLs source select
{
auto rck12selr(RCC::RCK12SELR());
rck12selr.PLL12SRC() = 1;
rck12selr.push();
do { rck12selr.pull(); } while (rck12selr.PLL12SRCRDY() == 0);
auto rck3selr(RCC::RCK3SELR());
rck3selr.PLL3SRC() = 1;
rck3selr.push();
do { rck3selr.pull(); } while (rck3selr.PLL3SRCRDY() == 0);
}
// PLL1 set
{
auto pll1cfgr1(RCC::PLL1CFGR1());
pll1cfgr1.DIVN() = 49;
pll1cfgr1.DIVM1() = 1;
pll1cfgr1.push();
auto pll1cfgr2(RCC::PLL1CFGR2());
pll1cfgr2.DIVP() = 0;
pll1cfgr2.push();
auto pll1fracr(RCC::PLL1FRACR());
pll1fracr.FRACV() = 0;
pll1fracr.FRACLE() = 0;
pll1fracr.push();
pll1fracr.FRACLE() = 1;
pll1fracr.push();
auto pll1cr(RCC::PLL1CR());
pll1cr.SSCG_CTRL() = 0;
pll1cr.PLLON() = 1;
pll1cr.push();
do { pll1cr.pull(); } while (pll1cr.PLL1RDY() == 0);
pll1cr.DIVPEN() = 1;
pll1cr.push();
}
// PLL2 set
{
auto pll2cfgr1(RCC::PLL2CFGR1());
pll2cfgr1.DIVN() = 43;
pll2cfgr1.DIVM2() = 1;
pll2cfgr1.push();
auto pll2cfgr2(RCC::PLL2CFGR2());
pll2cfgr2.DIVP() = 1;
pll2cfgr2.DIVR() = 0;
pll2cfgr2.push();
auto pll2fracr(RCC::PLL2FRACR());
pll2fracr.FRACV() = 0;
pll2fracr.FRACLE() = 0;
pll2fracr.push();
pll2fracr.FRACLE() = 1;
pll2fracr.push();
auto pll2csgr(RCC::PLL2CSGR());
pll2csgr.MOD_PER() = 120;
pll2csgr.SSCG_MODE() = 1;
pll2csgr.INC_STEP() = 12;
pll2csgr.push();
auto pll2cr(RCC::PLL2CR());
pll2cr.SSCG_CTRL() = 1;
pll2cr.PLLON() = 1;
pll2cr.push();
do { pll2cr.pull(); } while (pll2cr.PLL2RDY() == 0);
pll2cr.DIVPEN() = 1;
pll2cr.DIVREN() = 1;
pll2cr.push();
}
// PLL3 set
{
auto pll3cfgr1(RCC::PLL3CFGR1());
pll3cfgr1.DIVN() = 49;
pll3cfgr1.DIVM3() = 2;
pll3cfgr1.IFRGE() = 1;
pll3cfgr1.push();
auto pll3cfgr2(RCC::PLL3CFGR2());
pll3cfgr2.DIVP() = 1;
pll3cfgr2.push();
auto pll3fracr(RCC::PLL3FRACR());
pll3fracr.FRACV() = 0;
pll3fracr.FRACLE() = 0;
pll3fracr.push();
pll3fracr.FRACLE() = 1;
pll3fracr.push();
auto pll3cr(RCC::PLL3CR());
pll3cr.PLLON() = 1;
pll3cr.push();
do { pll3cr.pull(); } while (pll3cr.PLL3RDY() == 0);
pll3cr.DIVPEN() = 1;
pll3cr.push();
}
// MCU set
{
auto mcudivr(RCC::MCUDIVR());
mcudivr.MCUDIV() = 0;
mcudivr.push();
do { mcudivr.pull(); } while (mcudivr.MCUDIVRDY() == 0);
}
// AXI set
{
auto axidivr(RCC::AXIDIVR());
axidivr.AXIDIV() = 0;
axidivr.push();
do { axidivr.pull(); } while (axidivr.AXIDIVRDY() == 0);
}
// APB4 set
{
auto apb4divr(RCC::APB4DIVR());
apb4divr.APB4DIV() = 1;
apb4divr.push();
do { apb4divr.pull(); } while (apb4divr.APB4DIVRDY() == 0);
}
// APB5
{
auto apb5divr(RCC::APB5DIVR());
apb5divr.APB5DIV() = 1;
apb5divr.push();
do { apb5divr.pull(); } while (apb5divr.APB5DIVRDY() == 0);
}
// APB1
{
auto apb1divr(RCC::APB1DIVR());
apb1divr.APB1DIV() = 1;
apb1divr.push();
do { apb1divr.pull(); } while (apb1divr.APB1DIVRDY() == 0);
}
// APB2
{
auto apb2divr(RCC::APB2DIVR());
apb2divr.APB2DIV() = 1;
apb2divr.push();
do { apb2divr.pull(); } while (apb2divr.APB2DIVRDY() == 0);
}
// APB3
{
auto apb3divr(RCC::APB3DIVR());
apb3divr.APB3DIV() = 1;
apb3divr.push();
do { apb3divr.pull(); } while (apb3divr.APB3DIVRDY() == 0);
}
// switch
{
auto mpckselr(RCC::MPCKSELR());
mpckselr.MPUSRC() = 2; // pll1_p_ck
mpckselr.push();
do { mpckselr.pull(); } while (mpckselr.MPUSRCRDY() == 0);
auto assckselr(RCC::ASSCKSELR());
assckselr.AXISSRC() = 2; // pll2_p_ck
assckselr.push();
do { assckselr.pull(); } while (assckselr.AXISSRCRDY() == 0);
auto mssckselr(RCC::MSSCKSELR());
mssckselr.MCUSSRC() = 3; // pll3_p_ck
mssckselr.push();
do { mssckselr.pull(); } while (mssckselr.MCUSSRCRDY() == 0);
}
}
static void initialize_clock() noexcept
{
reset_clock();
set_clock();
}
static void initialize_gic() noexcept
{
//38 EXTI0, 41 EXTI3, 84 uart4, 86 tim6, 97 EXTI7
auto igroupr(GICD::IGROUPR(38)); igroupr.GROUP_STATUS() = 1;
igroupr.index(41); igroupr.GROUP_STATUS() = 1;
igroupr.index(84); igroupr.GROUP_STATUS() = 1;
igroupr.index(86); igroupr.GROUP_STATUS() = 1;
igroupr.index(97); igroupr.GROUP_STATUS() = 1;
igroupr.push();
auto isenabler(GICD::ISENABLER(38)); isenabler.SET_ENABLE() = 1;
isenabler.index(41); isenabler.SET_ENABLE() = 1;
isenabler.index(84); isenabler.SET_ENABLE() = 1;
isenabler.index(86); isenabler.SET_ENABLE() = 1;
isenabler.index(97); isenabler.SET_ENABLE() = 1;
isenabler.push();
auto ipriorityr(GICD::IPRIORITYR(38)); ipriorityr.PRIORITY() = 0;
ipriorityr.index(41); ipriorityr.PRIORITY() = 0;
ipriorityr.index(84); ipriorityr.PRIORITY() = 0;
ipriorityr.index(86); ipriorityr.PRIORITY() = 0;
ipriorityr.index(97); ipriorityr.PRIORITY() = 0;
ipriorityr.push();
auto itargetsr(GICD::ITARGETSR(38)); itargetsr.CPU_TARGETS() = 1;
itargetsr.index(41); itargetsr.CPU_TARGETS() = 1;
itargetsr.index(84); itargetsr.CPU_TARGETS() = 1;
itargetsr.index(86); itargetsr.CPU_TARGETS() = 1;
itargetsr.index(97); itargetsr.CPU_TARGETS() = 1;
itargetsr.push();
auto icfgr(GICD::ICFGR(38)); icfgr.INT_CONFIG() = 3;
icfgr.index(41); icfgr.INT_CONFIG() = 3;
icfgr.index(84); icfgr.INT_CONFIG() = 1;
icfgr.index(86); icfgr.INT_CONFIG() = 1;
icfgr.index(97); icfgr.INT_CONFIG() = 3;
icfgr.push();
}
void initialize_exti() noexcept
{
// PA.0 WK_UP, PG.3 KEY0, PH.7 KEY1
auto rtsr(EXTI::RTSR(0)); rtsr.RT() = 1;
rtsr.index(3); rtsr.RT() = 1;
rtsr.index(7); rtsr.RT() = 1;
rtsr.push();
auto ftsr(EXTI::FTSR(0)); ftsr.FT() = 1;
ftsr.index(3); ftsr.FT() = 1;
ftsr.index(7); ftsr.FT() = 1;
ftsr.push();
auto exticr(EXTI::EXTICR(0)); exticr.EXTI() = 0;
exticr.index(3); exticr.EXTI() = 6;
exticr.index(7); exticr.EXTI() = 7;
exticr.push();
auto imr(EXTI::IMR(0)); imr.IM() = 1;
imr.index(3); imr.IM() = 1;
imr.index(7); imr.IM() = 1;
imr.push();
auto emr(EXTI::EMR(0)); emr.EM() = 1;
emr.index(3); emr.EM() = 1;
emr.index(7); emr.EM() = 1;
emr.push();
}
static void initialize_gpio() noexcept
{
// open GPIO[A, B, F, G, H, I]
{
auto mp_ahb4ensetr(RCC::MP_AHB4ENSETR());
mp_ahb4ensetr.GPIOAEN() = 1;
mp_ahb4ensetr.GPIOBEN() = 1;
mp_ahb4ensetr.GPIOFEN() = 1;
mp_ahb4ensetr.GPIOGEN() = 1;
mp_ahb4ensetr.GPIOHEN() = 1;
mp_ahb4ensetr.GPIOIEN() = 1;
mp_ahb4ensetr.push();
}
{ // A.0 WK_UP, A.11 I2C6_SCL, A.12 I2C6_SDA
auto moder(GPIOA::MODER(0)); moder.MODE() = 0;
moder.index(11); moder.MODE() = 2;
moder.index(12); moder.MODE() = 2;
moder.push();
auto otyper(GPIOA::OTYPER(0)); otyper.OT() = 0;
otyper.index(11); otyper.OT() = 1; // 一定要是开漏!!!
otyper.index(12); otyper.OT() = 1; // 一定要是开漏!!!
otyper.push();
auto ospeedr(GPIOA::OSPEEDR(0)); ospeedr.OS() = 0;
ospeedr.index(11); ospeedr.OS() = 3;
ospeedr.index(12); ospeedr.OS() = 3;
ospeedr.push();
auto pupdr(GPIOA::PUPDR(0)); pupdr.PUPD() = 2;
pupdr.index(11); pupdr.PUPD() = 0;
pupdr.index(12); pupdr.PUPD() = 0;
pupdr.push();
auto afr(GPIOA::AFR(0)); afr.AF() = 0;
afr.index(11); afr.AF() = 2;
afr.index(12); afr.AF() = 2;
afr.push();
}
{ // B.2 UART4_RX
auto moder(GPIOB::MODER(2)); moder.MODE() = 2;
moder.push();
auto otyper(GPIOB::OTYPER(2)); otyper.OT() = 0;
otyper.push();
auto ospeedr(GPIOB::OSPEEDR(2)); ospeedr.OS() = 3;
ospeedr.push();
auto pupdr(GPIOB::PUPDR(2)); pupdr.PUPD() = 1;
pupdr.push();
auto afr(GPIOB::AFR(2)); afr.AF() = 8;
afr.push();
}
{ // F.3 led
auto moder(GPIOF::MODER(3)); moder.MODE() = 1;
moder.push();
auto otyper(GPIOF::OTYPER(3)); otyper.OT() = 0;
otyper.push();
auto ospeedr(GPIOF::OSPEEDR(3)); ospeedr.OS() = 0;
ospeedr.push();
auto pupdr(GPIOF::PUPDR(3)); pupdr.PUPD() = 1;
pupdr.push();
auto odr(GPIOF::ODR(3)); odr.OD() = 1;
odr.push();
}
{ // G.3 KEY0, G.11 UART4_TX
auto moder(GPIOG::MODER(3)); moder.MODE() = 0;
moder.index(11); moder.MODE() = 2;
moder.push();
auto otyper(GPIOG::OTYPER(3)); otyper.OT() = 0;
otyper.index(11); otyper.OT() = 0;
otyper.push();
auto ospeedr(GPIOG::OSPEEDR(3)); ospeedr.OS() = 0;
ospeedr.index(11); ospeedr.OS() = 3;
ospeedr.push();
auto pupdr(GPIOG::PUPDR(3)); pupdr.PUPD() = 1;
pupdr.index(11); pupdr.PUPD() = 1;
pupdr.push();
auto afr(GPIOG::AFR(3)); afr.AF() = 0;
afr.index(11); afr.AF() = 6;
afr.push();
}
{ // H.7 KEY1
auto moder(GPIOH::MODER(7)); moder.MODE() = 0;
moder.push();
auto otyper(GPIOH::OTYPER(7)); otyper.OT() = 0;
otyper.push();
auto ospeedr(GPIOH::OSPEEDR(7)); ospeedr.OS() = 0;
ospeedr.push();
auto pupdr(GPIOH::PUPDR(7)); pupdr.PUPD() = 1;
pupdr.push();
auto afr(GPIOH::AFR(7)); afr.AF() = 0;
afr.push();
}
{ // I.0 led
auto moder(GPIOI::MODER(0)); moder.MODE() = 1;
moder.push();
auto otyper(GPIOI::OTYPER(0)); otyper.OT() = 0;
otyper.push();
auto ospeedr(GPIOI::OSPEEDR(0)); ospeedr.OS() = 0;
ospeedr.push();
auto pupdr(GPIOI::PUPDR(0)); pupdr.PUPD() = 1;
pupdr.push();
auto odr(GPIOI::ODR(0)); odr.OD() = 0;
odr.push();
}
// // test I2C6
// {
// auto mp_ahb5ensetr(RCC::MP_AHB5ENSETR());
// mp_ahb5ensetr.GPIOZEN() = 1;
// mp_ahb5ensetr.push();
// }
// { // Z.6 I2C6_SCL, Z.7 I2C6_SDA
// auto moder(GPIOZ::MODER(6)); moder.MODE() = 2;
// moder.index(7); moder.MODE() = 2;
// moder.push();
// auto otyper(GPIOZ::OTYPER(6)); otyper.OT() = 0;
// otyper.index(7); otyper.OT() = 0;
// otyper.push();
// auto ospeedr(GPIOZ::OSPEEDR(6)); ospeedr.OS() = 3;
// ospeedr.index(7); ospeedr.OS() = 3;
// ospeedr.push();
// auto pupdr(GPIOZ::PUPDR(6)); pupdr.PUPD() = 1;
// pupdr.index(7); pupdr.PUPD() = 1;
// pupdr.push();
// auto afr(GPIOZ::AFR(6)); afr.AF() = 2;
// afr.index(7); afr.AF() = 2;
// afr.push();
// }
}
static void initialize_uart4() noexcept
{
auto apb1rstsetr(RCC::APB1RSTSETR());
apb1rstsetr.UART4RST() = 1;
apb1rstsetr.push();
auto apb1rstclrr(RCC::APB1RSTCLRR());
while (apb1rstclrr.UART4RST() == 0) { apb1rstclrr.pull(); }
apb1rstclrr.UART4RST() = 1;
apb1rstclrr.push();
do { apb1rstclrr.pull(); } while (apb1rstclrr.UART4RST() == 1);
auto uart24ckselr(RCC::UART24CKSELR());
uart24ckselr.UART24SRC() = 0;
uart24ckselr.push();
auto mp_apb1ensetr(RCC::MP_APB1ENSETR());
mp_apb1ensetr.UART4EN() = 1;
mp_apb1ensetr.push();
auto prescr(UART4::PRESCR());
prescr.PRESC() = 0;
prescr.push();
auto brr(UART4::BRR());
brr.BR() = 100000000 / 115200;
brr.push();
auto cr1(UART4::CR1());
cr1.UE() = 1;
cr1.RE() = 1;
cr1.TE() = 1;
cr1.RXNEIE() = 1;
cr1.M0() = 0;
cr1.OVER8() = 0;
cr1.M1() = 0;
cr1.push();
}
static void initialize_i2c6() noexcept // clock default use apb5
{
auto mp_apb5ensetr(RCC::MP_APB5ENSETR());
mp_apb5ensetr.I2C6EN() = 1;
mp_apb5ensetr.push();
auto cr1(I2C6::CR1());
cr1.ANFOFF() = 1;
cr1.DNF() = 0;
cr1.NOSTRETCH() = 0;
cr1.push();
auto cr2(I2C6::CR2());
cr2.PECBYTE() = 0;
cr2.push();
//
auto timingr(I2C6::TIMINGR());
timingr.PRESC() = 5;
timingr.SCLL() = 24;
timingr.SCLH() = 24;
timingr.SDADEL() = 25;
timingr.SCLDEL() = 24;
timingr.push();
cr1.pull();
cr1.PE() = 1;
cr1.push();
}
static void initialize_tim6() noexcept
{
// 根据157 reference-568页,当前配置下TIM的频率为200Mhz
auto mp_apb1ensetr(RCC::MP_APB1ENSETR());
mp_apb1ensetr.TIM6EN() = 1;
mp_apb1ensetr.push();
auto cr2(TIM6::CR2());
cr2.MMS() = 0;
cr2.push();
auto dier(TIM6::DIER());
dier.UIE() = 1;
dier.UDE() = 0;
dier.push();
auto pscr(TIM6::PSCR());
pscr.PSC() = 199;
pscr.push();
auto arr(TIM6::ARR());
arr.AR() = 1000;
arr.push();
auto cr1(TIM6::CR1());
cr1.CEN() = 1;
cr1.UDIS() = 0;
cr1.URS() = 0;
cr1.OPM() = 0;
cr1.ARPE() = 1;
cr1.UIFREMAP() = 0;
cr1.push();
}
void put_character(const character_type value) noexcept
{
for (auto isr(UART4::ISR()); isr.TXE() == 0; isr.pull()) {}
auto tdr(UART4::TDR(0));
tdr.TD() = value;
tdr.push();
}
void put_string(const character_type* value) noexcept
{
while (*value != '\0')
{
put_character(*value);
++value;
}
}
void put_size(const size& value) noexcept
{
if (value < 10)
{
put_character('0' + value.value());
return;
}
put_size(value / 10);
put_character('0' + (value % 10).value());
}
static void i2c6_write1(unsigned_integer8 address, unsigned_integer8 data) noexcept
{
auto isr(I2C6::ISR());
while (isr.BUSY() == 1) { isr.pull(); };
auto cr2(I2C6::CR2());
cr2.SADD() = address;
cr2.RD_WRN() = 0;
cr2.ADD10() = 0;
cr2.NBYTES() = 1;
cr2.RELOAD() = 0;
cr2.AUTOEND() = 1;
cr2.START() = 1;
cr2.push();
do { isr.pull(); } while (isr.TXE() == 0);
auto txdr(I2C6::TXDR(data));
txdr.push();
}
static void i2c6_write2(unsigned_integer8 address, unsigned_integer8 data0, unsigned_integer8 data1) noexcept
{
auto isr(I2C6::ISR());
while (isr.BUSY() == 1) { isr.pull(); };
auto cr2(I2C6::CR2());
cr2.SADD() = address;
cr2.RD_WRN() = 0;
cr2.ADD10() = 0;
cr2.NBYTES() = 2;
cr2.RELOAD() = 0;
cr2.AUTOEND() = 1;
cr2.START() = 1;
cr2.push();
I2C6::TXDR_cache txdr;
do { isr.pull(); } while (isr.TXE() == 0);
txdr.TXDATA() = data0;
txdr.push();
do { isr.pull(); } while (isr.TXE() == 0);
txdr.TXDATA() = data1;
txdr.push();
}
static unsigned_integer8 i2c6_read(unsigned_integer8 address) noexcept
{
auto isr(I2C6::ISR());
while (isr.BUSY() == 1) { isr.pull(); };
auto cr2(I2C6::CR2());
cr2.SADD() = address;
cr2.RD_WRN() = 1;
cr2.ADD10() = 0;
cr2.NBYTES() = 1;
cr2.RELOAD() = 0;
cr2.AUTOEND() = 1;
cr2.START() = 1;
cr2.push();
do { isr.pull(); } while (isr.RXNE() == 0);
auto rxdr(I2C6::RXDR());
return rxdr.RXDATA();
}
static void ap3216c_write(unsigned_integer8 address, unsigned_integer8 data) noexcept
{
i2c6_write2(0x1e << 1, address, data); // 注意7位地址时,使用的是bit[1..7]
}
static unsigned_integer8 ap3216c_read(unsigned_integer8 address) noexcept
{
i2c6_write1(0x1e << 1, address); // 注意7位地址时,使用的是bit[1..7]
return i2c6_read(0x1e << 1);
}
void initialize() noexcept
{
initialize_clock();
initialize_gpio();
initialize_uart4();
initialize_i2c6();
initialize_tim6();
initialize_gic();
initialize_exti();
put_string("boot.\r\n");
}
extern "C"
{
void px_GIC_UART4() noexcept // 最简单的处理
{
auto isr(UART4::ISR());
if (isr.RXNE() == 1)
{
put_character((character_type)UART4::RDR().RD());
}
}
size systick_count(0);
void px_GIC_TIM6() noexcept //
{
auto sr(TIM6::SR());
sr.UIF() = 0;
sr.push();
++systick_count;
if (systick_count % 1000 == 0)
{
put_string("second=");
put_size(systick_count / 1000);
{
auto odr(GPIOF::ODR(3)); odr.OD() ^= 1;
odr.push();
}
put_string(" ap3216c");
put_string(" mode[0x0]="); put_size(ap3216c_read(0x0));
put_string(" PS_low[0xe]="); put_size(ap3216c_read(0xe));
put_string(" PS_high[0xf]="); put_size(ap3216c_read(0xf));
put_string("\r\n");
}
}
void px_GIC_EXTI0() noexcept // WK_UP
{
auto rpr(EXTI::RPR(0));
if (rpr.RPIF() == 1)
{
rpr.value() = 0;
rpr.RPIF() = 1;
rpr.push();
}
auto fpr(EXTI::FPR(0));
if (fpr.FPIF() == 1)
{
fpr.value() = 0;
fpr.FPIF() = 1;
fpr.push();
}
put_string("WK_UP.\r\n");
}
void px_GIC_EXTI3() noexcept // KEY0
{
auto rpr(EXTI::RPR(3));
if (rpr.RPIF() == 1)
{
rpr.value() = 0;
rpr.RPIF() = 1;
rpr.push();
}
auto fpr(EXTI::FPR(3));
if (fpr.FPIF() == 1)
{
fpr.value() = 0;
fpr.FPIF() = 1;
fpr.push();
}
put_string("KEY0 open ap3216c.\r\n");
ap3216c_write(0x0, 3);
}
void px_GIC_EXTI7() noexcept // KEY1
{
auto rpr(EXTI::RPR(7));
if (rpr.RPIF() == 1)
{
rpr.value() = 0;
rpr.RPIF() = 1;
rpr.push();
}
auto fpr(EXTI::FPR(7));
if (fpr.FPIF() == 1)
{
fpr.value() = 0;
fpr.FPIF() = 1;
fpr.push();
}
put_string("KEY1 close ap3216c.\r\n");
ap3216c_write(0x0, 0);
}
void px_GIC_default() noexcept
{
put_string("GIC_default\r\n");
}
}

复制代码

sppz · 发表于 2020-12-25 16:52:25

本帖最后由 sppz 于 2020-12-26 11:09 编辑

有兴趣跟进了解的请关注:px

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stm32mp157无系统裸机之硬件I2C(I2C6,AP3216C)

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