Customer query
---
I have tried to
persuade the eHRPWM1 to produce 1/6 of the ASYNC3 clock on the B output
by
letting it count
down and toggle on zero.
My plan is to stop-
and start it by changing the AQCTLB register between 1 and 3 on the
fly.
But it doesn't work.
Apparently it doesn't even start.
What's wrong? What did I miss? Do you have
a clue?
The code
is:
typedef struct epwm_s {
// Time-Base Submodule Registers
volatile u16 tbctl; // 00h Time-Base Control Register
volatile u16 tbsts; // 02h Time-Base Status Register
volatile u16 tbphshr; // 04h Extension for HRPWM Phase Register (2)
volatile u16 tbphs; // 06h Time-Base Phase Register
volatile u16 tbcnt; // 08h Time-Base Counter Register
volatile u16 tbprd; // 0Ah Time-Base Period Register (Shadow)
u16 res1; // 0Ch
// Counter-Compare Submodule Registers
volatile u16 cmpctl; // 0Eh Counter-Compare Control Register
volatile u16 cmpahr; // 10h Extension for HRPWM Counter-Compare A Register (2)
volatile u16 cmpa; // 12h Counter-Compare A Register (Shadow)
volatile u16 cmpb; // 14h Counter-Compare B Register (Shadow)
// Action-Qualifier Submodule Registers
volatile u16 aqctla; // 16h Action-Qualifier Control Register for Output A (EPWMxA)
volatile u16 aqctlb; // 18h Action-Qualifier Control Register for Output B (EPWMxB)
volatile u16 aqsfrc; // 1Ah Action-Qualifier Software Force Register
volatile u16 aqcsfrc; // 1Ch Action-Qualifier Continuous S/W Force Register Set (Shadow)
// Dead-Band Generator Submodule Registers
volatile u16 dbctl; // 1Eh Dead-Band Generator Control Register
volatile u16 dbred; // 20h Dead-Band Generator Rising Edge Delay Count Register
volatile u16 dbfed; // 22h Dead-Band Generator Falling Edge Delay Count Register
// Trip-Zone Submodule Registers
volatile u16 tzsel; // 24h Trip-Zone Select Register
u16 res2; // 26h
volatile u16 tzctl; // 28h Trip-Zone Control Register (3)
volatile u16 tzeint; // 2Ah Trip-Zone Enable Interrupt Register (3)
volatile u16 tzflg; // 2Ch Trip-Zone Flag Register (3)
volatile u16 tzclr; // 2Eh Trip-Zone Clear Register (3)
volatile u16 tzfrc; // 30h Trip-Zone Force Register (3)
// Event-Trigger Submodule Registers
volatile u16 etsel; // 32h Event-Trigger Selection Register
volatile u16 etps; // 34h Event-Trigger Pre-Scale Register
volatile u16 etflg; // 36h Event-Trigger Flag Register
volatile u16 etclr; // 38h Event-Trigger Clear Register
volatile u16 etfrc; // 3Ah Event-Trigger Force Register
// PWM-Chopper Submodule Registers
volatile u16 pcctl; // 3Ch PWM-Chopper Control Register
} epwm_t;
// Time-Base Submodule Registers
volatile u16 tbctl; // 00h Time-Base Control Register
volatile u16 tbsts; // 02h Time-Base Status Register
volatile u16 tbphshr; // 04h Extension for HRPWM Phase Register (2)
volatile u16 tbphs; // 06h Time-Base Phase Register
volatile u16 tbcnt; // 08h Time-Base Counter Register
volatile u16 tbprd; // 0Ah Time-Base Period Register (Shadow)
u16 res1; // 0Ch
// Counter-Compare Submodule Registers
volatile u16 cmpctl; // 0Eh Counter-Compare Control Register
volatile u16 cmpahr; // 10h Extension for HRPWM Counter-Compare A Register (2)
volatile u16 cmpa; // 12h Counter-Compare A Register (Shadow)
volatile u16 cmpb; // 14h Counter-Compare B Register (Shadow)
// Action-Qualifier Submodule Registers
volatile u16 aqctla; // 16h Action-Qualifier Control Register for Output A (EPWMxA)
volatile u16 aqctlb; // 18h Action-Qualifier Control Register for Output B (EPWMxB)
volatile u16 aqsfrc; // 1Ah Action-Qualifier Software Force Register
volatile u16 aqcsfrc; // 1Ch Action-Qualifier Continuous S/W Force Register Set (Shadow)
// Dead-Band Generator Submodule Registers
volatile u16 dbctl; // 1Eh Dead-Band Generator Control Register
volatile u16 dbred; // 20h Dead-Band Generator Rising Edge Delay Count Register
volatile u16 dbfed; // 22h Dead-Band Generator Falling Edge Delay Count Register
// Trip-Zone Submodule Registers
volatile u16 tzsel; // 24h Trip-Zone Select Register
u16 res2; // 26h
volatile u16 tzctl; // 28h Trip-Zone Control Register (3)
volatile u16 tzeint; // 2Ah Trip-Zone Enable Interrupt Register (3)
volatile u16 tzflg; // 2Ch Trip-Zone Flag Register (3)
volatile u16 tzclr; // 2Eh Trip-Zone Clear Register (3)
volatile u16 tzfrc; // 30h Trip-Zone Force Register (3)
// Event-Trigger Submodule Registers
volatile u16 etsel; // 32h Event-Trigger Selection Register
volatile u16 etps; // 34h Event-Trigger Pre-Scale Register
volatile u16 etflg; // 36h Event-Trigger Flag Register
volatile u16 etclr; // 38h Event-Trigger Clear Register
volatile u16 etfrc; // 3Ah Event-Trigger Force Register
// PWM-Chopper Submodule Registers
volatile u16 pcctl; // 3Ch PWM-Chopper Control Register
} epwm_t;
extern far epwm_t _epwm0;
extern far epwm_t _epwm1;
extern far epwm_t _epwm1;
void epwm_setup(epwm_t *e, u16 div)
{
int i0;
_cfgchip[1]&= ~(1<<12);// TBCLKSYNC
for (i0 = 0; i0 < 31; i0++) ((u16 *)e)[i0] = 0;
e->tbctl = 0; // stop
e->tbsts = 0;
e->tbphs = 0;
e->tbphshr = 0;
e->tbcnt = div;
e->tbprd = div;
e->cmpctl = 0; // Load on tbcnt = 0
e->cmpahr = 0;
e->cmpa = 0;
e->cmpb = 0;
e->aqctla = 0;
e->aqctlb = 3; // toggle b on (cnt == 0)
{
int i0;
_cfgchip[1]&= ~(1<<12);// TBCLKSYNC
for (i0 = 0; i0 < 31; i0++) ((u16 *)e)[i0] = 0;
e->tbctl = 0; // stop
e->tbsts = 0;
e->tbphs = 0;
e->tbphshr = 0;
e->tbcnt = div;
e->tbprd = div;
e->cmpctl = 0; // Load on tbcnt = 0
e->cmpahr = 0;
e->cmpa = 0;
e->cmpb = 0;
e->aqctla = 0;
e->aqctlb = 3; // toggle b on (cnt == 0)
e->aqsfrc = 0;
e->aqcsfrc = 0;
e->dbctl = 0;
e->dbred = 0;
e->dbfed = 0;
e->pcctl = 0;
e->tzsel = 0;
e->tzctl = 0;
e->tzeint = 0;
e->tzclr = 7; // clear all interrupts
e->tzfrc = 0;
e->etsel = 0;
e->etps = 0;
e->etclr = 1; // clear flag
e->aqcsfrc = 0;
e->dbctl = 0;
e->dbred = 0;
e->dbfed = 0;
e->pcctl = 0;
e->tzsel = 0;
e->tzctl = 0;
e->tzeint = 0;
e->tzclr = 7; // clear all interrupts
e->tzfrc = 0;
e->etsel = 0;
e->etps = 0;
e->etclr = 1; // clear flag
e->tbctl = 0xC071; // Free run, no
EPWMxSYNC0, count down, force sync
_cfgchip[1]|= (1<<12);// TBCLKSYNC
_cfgchip[1]|= (1<<12);// TBCLKSYNC
p(" EPWM started");
